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Author Topic: DH Venom  (Read 53754 times)

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Offline IB

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DH Venom
« on: February 25, 2006, 20:20:18 PM »


These are the fibre/epoxy parts supplied in the part kit from MR, they are light and of good quality



The wood parts are here CNC cut and the formers need only minor trimming to fit, the wing ribs will have to be binned though as the root rib does not match the root section of the fuselage, I finished up binning all the ribs on the last Venom and starting from scratch and I will do the same this time as there is a turned down section at the trailing edge on some of the ribs that I have no idea about and is not mentioned on the plans and is not some alignment guide either. Luckily I made templates of the "new" ribs to aid a friend who was also going to build one so I shall use these.



Here is the intake now glued up ready to fit inside the fuselage



Heres the intake in place before the front former is fitted



And lastly for tonight, the formers in place, initially tacked with rapid araldite and then when checked the last time for accurate alignment, Hysol glue applied.




The next job will be the noseleg mounting plate.


IB
« Last Edit: February 25, 2006, 20:49:03 PM by IB »
A womans mind is cleaner than a mans.
She changes it more often.


Offline IB

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Re: DH Venom
« Reply #1 on: February 26, 2006, 14:42:00 PM »
I spent a little time marking the the fuselage for the noseleg mounting plate as the position for the plate is dependant on the type of retract used. The plans are drawn up for MR's own retract units which would be fine for the original model as this was a ducted fan weighing 16lbs, however, the turbine versions tend to weigh 22 - 28lbs so a meatier retact system is needed. I have got a set of Airpower units that Als Hobbies sell, I used the ones originally purchased for the Venom on my Boomerang XL and was very impressed by these units and at a reasonable price too so I have obtained another set. The supplied plate will not fit the new higher position so a new plate was cut and tacked into position as well as making the cutout for the front hatch, on the full size this hatch gives accesss to the battery, ballast and the rear of the instrument panel



The plate in place tack glued in the interim



I now highlighted the lines to cut along to remove the two undercarriage doors



And removed said items



This gives me access to the underside of the plate showing the alignment tabs I tacked on to ensure the plate stays in place whilst the glue sets, I will remove these tabs and apply Hysol top and bottom then apply some carbon fibre cloth and resin to stiffen the plate to the fuselage



At the same time I will add some carbon cloth and tows to stiffen up the front fuselage areas, now to start the wings.

IB


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Offline IB

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Re: DH Venom
« Reply #2 on: March 02, 2006, 21:44:33 PM »
When the noseleg mounting plate glue had set I then added some carbon fibre cloth and resin to the top and bottom of the plate to firmly secure it and to stiffen up the nose area, whilst doing this I added the lower ply formet which lies just behind the nosebay, this also stiffens the front fuselage. A test run with the nose unit and strut in place confirmed the alignment was all correct





Whilst marking out the wing ribs I filled the gap between the inlet and ducting as the ducts are 1/8th - 1/4 inch larger than the inlet so this requires application of lightweight filler to make the inlets smooth and of scale appearance, its a little time consuming but worth it in the end and going around the applied filler before it set with a wet finger moulds it into almost the required shape.




IB
A womans mind is cleaner than a mans.
She changes it more often.


Offline thescaleman

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Re: DH Venom
« Reply #3 on: March 02, 2006, 22:32:14 PM »
looking good IB.......what engine are you using?.....may mate almost built one of these, but sold it near completion...was going to use a wren54.....the only problem he had was with the booms....and there alignment...might be able to give some advise when you get to them....

keep it coming...what scheme are you doing?

all the best

dave

Offline IB

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Re: DH Venom
« Reply #4 on: March 02, 2006, 23:08:41 PM »
Hi Dave,

This is the second one I have built, I aquired the first part started but had to scrap what had been done ( one wing ). I found out about the boom alignment when I was doing the first, the ali tubes supplied pre cut to the angle required to make the tailplane parallel +/- with the wing should be cut to 13 degrees, however, they were cut to 17 degrees so I had to recut them. It is a builders (part) kit and MR has been accused of not giving enough detail in the plans but in fairness he has left it to the builder to construct it to suit their engine / radio / retract system, some find this not enough and are a little critical about these issues. Errors in the wing ribs which come CNC cut require these to be binned and a new accurate set to be cut. My first one flew straight off the board but on its eighth flight it went into failsafe three times, the last as I was setting it up for an emergency landing, and was totalled.
Engine is a JetCat P80 was the unit I used in the first one, more than enough power, once off the ground it flew on half power and full power was only used for verticals. I must admit though it looked superb in the air and flew on rails.


IB
A womans mind is cleaner than a mans.
She changes it more often.


Offline g4rko

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Re: DH Venom
« Reply #5 on: March 03, 2006, 12:42:19 PM »
Nice job Ian. Note the comments about the Venom kit being short on detail and construction method left to the devices of the builder! The MR Hunter shares the same characteristics. Sorted out the retracks on the Hunter with a bit of judicious milling - the legs now sit on the retract block. Has the F18 flown yet?

Barry
Barry Cooper

Offline Andy_S_T

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Re: DH Venom
« Reply #6 on: March 03, 2006, 14:29:47 PM »
I've always liked the Venom but have been put off by prople comments on Micks kits. I shall be watching with interest to see how it actually goes together. I'm not too impressed with having to redesign the wing mind :'(.


Offline IB

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Re: DH Venom
« Reply #7 on: March 03, 2006, 16:08:28 PM »
Hi Barry

The f-18 has yet to maiden, I was going to take it up to Decembers Classic Jets but I had second thoughts and decided I would save it for a rainy day !

Andy, having to make up new wing ribs is no big issue once you know it has to be done, I find it an issue that the faults people have found and had to deal with have been brought to the manufacturers attention in the eight years that the kit has been available and nothing has been done to address these faults !

IB
A womans mind is cleaner than a mans.
She changes it more often.

Offline IB

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Re: DH Venom
« Reply #8 on: March 09, 2006, 21:52:36 PM »
The wings have been started and the port wing is well on the way. Here, the primary structure has been pinned down and glued, each wing is built in one piece and after sheeting it is cut where the centre of the wing joining tubes are, the inner section is attatched to the fuselage leaving the outer panel removable for transport.




Once the glue is set the upper sheeting was added and left overnight, then the wing was flipped over and set on jigging blocks to ensure that while working on the underside it does not twist out of true as there is built in washout. Two servos are to be incorporated, one aileron servo in the outer panel and one flap servo in the inner panel inside the wheel well, these have to be added before the lower sheeting is applied. There is a third servo for the elevator rearward of the u/c plate but this is added after the sheeting is done. The jury is out as to whether I will have working airbrakes, I may just power these with mini air rams, they are not to be used in flight as the hinging area is minimal and they would just rip out, however, they need to be hinged as the wing tubes are set at an angle and when sliding the outer panel on the airbrake has to be moved up or it will catch otherwise.



And finally, here is my original Venom, I am going to do the same scheme as I liked it so much.




IB
A womans mind is cleaner than a mans.
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Offline Tiger

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Re: DH Venom
« Reply #9 on: March 09, 2006, 23:19:20 PM »
Ian,

That really is, a very pretty aeroplane.......

I can understand why you had to build another....... :af  :af  :)

Watching with great interest...

Andy
I do have my failings................... fortunately, making mistakes is not one of them.

Offline thescaleman

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Re: DH Venom
« Reply #10 on: March 09, 2006, 23:29:46 PM »
coming on Ian......sometimes i do wonder where my mates Venom has ended up :-X......but the guy was pleased with it.....i like the  scheme too...those yellow wing tanks i guess can be seen for miles.....something i need to look at now i'am getting older ;D ;D

i know the doors caused him heart ache.....but i guess you know what to do there..

cheers

dave

Offline jetflyer

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Re: DH Venom
« Reply #11 on: March 14, 2006, 20:56:40 PM »
Will there be no problem fitting the Al's retracts, do they retract as per scale and are any mods necessary in the nose and wings. I am asking this as I am thinking of buying one.

Offline IB

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Re: DH Venom
« Reply #12 on: March 14, 2006, 23:19:46 PM »
Hi Jetflyer

The Airpower retracts that Ali sells fit a treat, the mains are designed so the trunion block can be reversed, i.e. the leg retracts away from the cylinder, it requires one circlip to be removed then the block eased out and reversed then the circlip fitted back again. The main units have to be like this as the wheels are 4 inches diameter and the legs are short which means the wheels will foul on the cylinders, it does mean the cylinders will now sit inside the fuselage where it is convenient to fit the saddle tanks but I'm making up a set of custom fit one litre capacity tanks which have a recess that the air cy;inder will fit into thus maintaining maximum fuel capacity, a third tank sits forward of the air intakes giving a capacity in total of 3 litres.

The nose unit needs to sit higher in the fuselage than shown on the plan due to the difference in design to MRs own retracts. This is easily done, see the pictures above. One thing though and its not a problem, the unit retracts 90 degrees but due to the higher position in the fuselage it only needs to retract about 60 degrees for the wheel to be fully inside the fuselage, if the leg is allowed to go the full 90 degrees the wheel takes up valuable space where systems/batteries should go so I have fitted limiters to the unit so the uplock now is at approx 60 degrees. I'll do some photos for a better explanation in my next post. Hope this answers your questions.

IB
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Offline Ali

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Re: DH Venom
« Reply #13 on: March 15, 2006, 22:10:38 PM »
Looking good Ian.
 Hope that F-18's not too dusty and neglected. Shame your work bench isn't bigger, you could fit two of those Venom's on there a treat  :P
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Offline nmacwarbirds

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Re: DH Venom
« Reply #14 on: March 15, 2006, 23:05:13 PM »
Dear Ian
The pictures in the background is that Patrick Anthony by any chance.
The chef who used to work for Anglia TV. ;D
Regards Phil G.
PS. Will the Venom be ready for the Colt bash on Sunday April the 2nd
Never in the field of human conflict was so much owed by so many to so few.
Coltishall Memorial Flight. 242 Sqn.

Offline IB

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Re: DH Venom
« Reply #15 on: March 16, 2006, 22:26:11 PM »
Hi Jetflyer

Here are a couple of piccys regarding the u/c fit in the wing. The first is of the modified unit where I reversed the trunion block, you can see the circlip that has to be removed, the hinge pin is withdrawn and the block reversed.

And here is the unit in the wing showing how much it protrudes into the fuselage, this is not a problem as the tank, as mentioned, will have a recess to allow for this without compromising capacity too much, 3 litres of fuel on a P80 equates to around 15 minutes of flight time at full throttle, more than enough.


And Phil, don't know who the gentleman is you are refering to, maybe you can shed a little light on his identity, but I got this from a friend last Christmas who saw it and thought of me, not sure whether to be flattered or insulted but it always makes me smile when I wander into the workshop


And its not getting test flown till April 3rd so I;ll have to decline the offer of the Colt bash !

Ali, the F-18 is kept dust free and polished by Miss Management ! Awaiting suitable weather and bike clips.

IB
A womans mind is cleaner than a mans.
She changes it more often.

Offline nmacwarbirds

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Re: DH Venom
« Reply #16 on: March 16, 2006, 23:51:55 PM »
Dear Ian
My eyes are not what they used to be.
I can see in the close up pic, that it is not Patrick Anthony.
I have no idea who the gent is in the pic.
It looks like you are doing a good job with the venom.
Good luck with the test flight of the F18.

Regards Phil G.
Never in the field of human conflict was so much owed by so many to so few.
Coltishall Memorial Flight. 242 Sqn.

Offline FlyinBrian

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Re: DH Venom
« Reply #17 on: March 17, 2006, 11:05:19 AM »
The picture looks like a chap that did a DIY program on TV many years ago, probably 35 years or possibly more. The name escapes me though.
Basic Research is what I do - when I don't know what I'm doing!.

Offline RFJ

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Re: DH Venom
« Reply #18 on: March 17, 2006, 11:14:00 AM »
Only name I remember from old tv diy shows is Barry Bucknell I but don't think its him.

Offline nmacwarbirds

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Re: DH Venom
« Reply #19 on: March 17, 2006, 11:54:09 AM »
Dear RFJ
I thought it might be Barry Bucknall.
But the text on the Photograph says Frank.
Sorry Ian for sending your very interesting Venom thread off at a tangent. ;D

Regards Phil G.
Never in the field of human conflict was so much owed by so many to so few.
Coltishall Memorial Flight. 242 Sqn.

Offline Dave_S

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Re: DH Venom
« Reply #20 on: March 17, 2006, 11:56:32 AM »
Dear RFJ
I thought it might be Barry Bucknall.
But the text on the Photograph says Frank.
Sorry Ian for sending your very interesting Venom thread off at a tangent. ;D

Regards Phil G.

I wouldn't take any notice of the name in the caption - there is a whole industry devoted to recycling old photographs with 'witty' captions. I used to have some involvement with it myself.

Back to the topic!

Dave S
Dave S in West Oxfordshire

Offline jetflyer

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Re: DH Venom
« Reply #21 on: March 18, 2006, 00:04:57 AM »
Thanks IB for showing me the retract mods. I have a set of these in my Baby Boomerang and they can take a lot of punishment. I fly off grass so they have to be good.
Thanks
Paul (aka Jetmodeller)  :af

Offline siclick33

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Re: DH Venom
« Reply #22 on: March 20, 2006, 20:11:55 PM »
Ian, are you using MR's own struts?

Are they inset into the retract? I'm a bit concerned that the MR struts may be too short if inset, as they look like they are designed to use a 6mm pin (or similar).

What are you using for a noseleg?


My kit has arrived and I'm going to start work soon. Overall I'm quite happy but a bit p**sed that the tail boom joiners are incorrect and the root rib is useless >:(. I haven't looked to see if I can use the rest of them yet. Mick told me to use the stock ribs otherwise I may have problems fitting the retracted gear in the wing. He said that the join would be covered by the cloth so isn't a problem; maybe not, if you don't mind having a huge step or a ton of filler!

Offline IB

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Re: DH Venom
« Reply #23 on: March 21, 2006, 21:51:24 PM »
Hi S33
Yes, the struts are MRs ones for the Venom as is the noseleg which is a Eurokit one he's shortened a little, the main struts are 1/2 inch diameter which match perfectly the Airpower units as the clamp fitting is for a 1/2 inch oleo, they sit in the clamp to a depth of 20mm and as luck would have it are the correct length, although they are meant for a pin fitting into the MR unit they have a steel insert inside to give the cap screws threads some strength. I have just removed the cap screws and clamped them into the retract units. The noseleg has a brass insert fitted which I opened up to 6mm as the nose retract unit is a 6mm pin type fitting.

As there is a difference in design between the MR units and the Airpower units the height of the nose unit mounting plate is approx 1/2 inch higher than shown on the plan, see my above posts. I made up a new plate but you can use the supplied one but it will have to be cut into two lengthwise as the nose unit has to sit as far forward as possible leaving no meat on the front part of the plate, this isn't a problem to do though my replacement plates are longer than the one supplied I use the extra length to sit the batteries on.

I used MR's own Venom retracts in my original model and the cut outs in the two inboard ribs for the mounting plates were in the wrong place, this for units and ribs designed specifically for the Venom got me thinking what else is wrong, as a result I spent time going through all angles and incidences and found errors everywhere which I am quite happy to put into print, its a long list though but as the build progresses I will indicate these and the fixes. I will say throw the ribs away and start with a clean sheet, take a copy of the root section on the fuselage, and copy the tip birch ply rib onto balsa or Lite Ply, remove 3/32 inch from the top and bottom of this tip rib and this will give you the means to make a set of ribs using the sandwich method, once done make a copy of each rib for the other wing. Take the first two ribs R1 & R2 and offer up the u/c unit with strut attached and retracted, then make a mark on these ribs where the strut will lie 3/32 up from the lower edge of the rib, then mark where the mounting plate will be cut out, the upper part of the u/c uniy should be 1/8th below the upper wing sheeting and when the wheel is fitted part of the wheel should protrude through the upper wing sheeting, this of course will be covered up by the supplied fairing, it is the same with the full size. The new main wheels MR supplies are very good and are the correct scale thickness, I originally used Len Gardiner supplied wheels and fitted my own scale hub covers I turned up in perspex but these new wheels are spot on and harder wearing.

The wing joining tubes have to be parallel, they are not on the plan, 3 degree difference, if not parallel you will never separate the outer panel from the inner after building them, redraw the rear joiner on the plan in red as a reference.

The boom tubes have been chamfered to 17-18 degrees, these need to be reprofiled to 12-13 degrees, I made up a jig set at 13 degrees and recut them on my disk sander on my original model, I now will cut them to 12 degrees as I needed a tiny amount of down trim when I flew it so I figured to do away with the trim by reducing the incidence by 1 degree.

Hope this helps and dos'nt discourage you any, now knowing the pitfalls my second one is coming on in leaps and bounds, its going together faster than I can buy the additional items required for it !

IB

A womans mind is cleaner than a mans.
She changes it more often.

Offline IB

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Re: DH Venom
« Reply #24 on: April 02, 2006, 22:40:09 PM »
Managed to get a little more done over the last week, I'd prefer to have gone out flying but time off and decent weather are just not happening.

Both wings are now completed and joined to the fuselage, here is the underside of one inner and outer panel ready for the wing sheeting to be applied, the joining tubes have been triple checked to make sure they are exactly parallel, won't get the two apart if they're not, the plans are out by 3 degrees, sufficient to prevent separation as I found out on my first one !

The servos are in, aileron being obvious, the inner servo is for the outboard flap, there is an inner flap which is part of the fuselage pod, this will be done at a later date, but it makes life a lot easier to have the four flaps powered by four servos because using a "Matchbox" they can be accurately set individually to give the correct amount of movement each flap requires. Trying to balance one servo/two flaps is a pain.


The underside now sheeted with the aileron fitted, the cutouts have been made for the flap and airbrake.


Once both panels were completed they were glued to the fuselage pod one at a time, I used 5 min epoxy here, once both panels are set then the join will be reinforced with fibre glass top and bottom two inches either dide of the join.



Once the glue had set it was time to dismantle the outer panels from the fuselage, they were left on for glueing so I could make sure both panels were true incidence wise and at the correct 2 degree dihedral. It is worth mentioning here that the angles on the fuselage pod for the dihedral are incorrect, they should both be at zero with 2 degress built into the root rib on each wing panel, however, the port wing root rib requires the aforementioned 2 degrees but the starboard root rib requires 0 degrees as the pod itself has the two degrees in, bit of a cock up there with the fuselage plug methinks, my last one was the same so all pods will have this error in.


And here on its lonesome is the removed port outer panel.


Next will be the tail booms and the tailplane but I'm off for a cup of tea and a bucket of wine gums.

IB
A womans mind is cleaner than a mans.
She changes it more often.

Offline Mark H

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Re: DH Venom
« Reply #25 on: April 04, 2006, 10:20:07 AM »
Ian

I was sad to hear of the demise of your beautiful Venom and am following your new build with great interest. I very much miss my Venom and may follow your lead and build another given as you know the fantastic flying qualities which out weigh any building problems.....aren't they half the fun of modelling anyway! I think we have the same taste in aeroplanes as the F-18 is another favorite of mine..good luck with the test flight. I see you've gone for the scale hatch on the nose...I did this also with a removable cockpit rather than go for the v. large hatch...I did'nt like that idea much. Those retracts look good..... I used as you did Mick's own and found them a little weak (probably my landings!) The new wheels look good though

Keep up the building really enjoying the thread

Offline siclick33

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Re: DH Venom
« Reply #26 on: April 04, 2006, 19:44:24 PM »
Thanks for the continued thread. I think I would struggle to build this without your pictures.

I have just started sorting out the wing ribs. I have my template for the root rib. How did you make your rib set? I have heard about the sandwich method but never tried it.


I was just about to order Al's retracts but a couple of guys at my club have had problems. The complaints seem to be more about Al's help (or lack of) in replacing parts rather than the gear itself. I'm looking at Robart gear. I am also waiting to see what Unitracts can do.
« Last Edit: April 05, 2006, 00:08:02 AM by siclick33 »

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Re: DH Venom
« Reply #27 on: April 05, 2006, 20:33:33 PM »
Hi MH, thanks for the comments, Siclick33, sent you a PM.

IB
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Offline siclick33

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Re: DH Venom
« Reply #28 on: April 05, 2006, 22:14:40 PM »
Quote
take a copy of the root section on the fuselage, and copy the tip birch ply rib onto balsa or Lite Ply, remove 3/32 inch from the top and bottom of this tip rib and this will give you the means to make a set of ribs using the sandwich method

Am I correct in saying that the 3/32 shout be taken off the root template? I am not sure why I would have to remove anything from the tip. Did you use the kit tip rib as a template for your new ribs, only it has the odd T.E. section on it and I don't want this to be transferred to my new rib set.

One final question for now. The plan calls for taper on the rear spar. Should this taper be made before the wing is built? i.e. does the packing amount stated on the plans take this taper into account. I don't want to get the washout wrong.

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Re: DH Venom
« Reply #29 on: April 05, 2006, 22:59:41 PM »
Dear Ian
Just a thought regarding the ribs.
If the wings were covered in pro skin instead of 1/8 or 3/32 balsa
would they then be correct. We had a similar problem with the ailerons
on the Lightning. The problem was the other way round it was because we used pro skin instead of 1/8 balsa.

Regards Phil G.
Never in the field of human conflict was so much owed by so many to so few.
Coltishall Memorial Flight. 242 Sqn.

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Re: DH Venom
« Reply #30 on: April 06, 2006, 08:32:43 AM »
3/32 inch off the root wing section top and bottom to account for the 3/32 inch sheet that will be applied, and use the birch ply full section tip rib that is supplied with the kit as your tip template, also taking 3/32 inch off this as well.

Phil, the Venom is pre-proskin, so 3/32 would have to be added to MR's ribs but the wing section at the fuselage differs from the root rib and subsequent ribs supplied with the kit, by the way, not impressed by proskin at all as a means to cover a wing. Its OK for flat uses such as a flap but I saw a Hunter covered in this stuff last year and it sagged between the ribs spoiling the superb scheme the plane had, give me balsa any day.

IB
« Last Edit: April 06, 2006, 17:37:25 PM by IB »
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Offline siclick33

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Re: DH Venom
« Reply #31 on: April 11, 2006, 18:45:34 PM »
Thanks Ian, I hadn't seen the 'tip tank' rib as it was on a different sheet!

Could you help with my rear spar taper question? Do I taper it before or after assembling the wing? Do the packing amounts stated on the plan relate to the tapered spar? This is an area of concern for me as I don't want to get the washout wrong.

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Re: DH Venom
« Reply #32 on: April 11, 2006, 19:00:17 PM »
Hi S33

The rear spars taper from 1/4 to 1/8 inch starting at rib 8 I think, remove the material from the 1/4 sq. strip so you are left with a tapering spar from rib 8's position. Then, take a sheet of 1/4 and cut a strip starting out at 6mm at the position of the root rib and finishing at 10mm at the tip rib, this is the packing you will put under the rear spar to achieve the washout required, 1/4 inch as measured at the trailing edge of the aileron, pin a spare length of 1/4 sq. under the front spar so the ribs are clear of the plan as they are of semi-symmetrical section.
When you pin down the rear spar, make sure you have the side with the removed material on the inside, the flat to the bottom.. Wax both spar supprts so they will not stick to the spars and you can use them again when you build the other wing !

Regards

IB
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She changes it more often.

Offline siclick33

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Re: DH Venom
« Reply #33 on: May 18, 2006, 00:32:34 AM »
Any more progress? I'm eagerly awaiting the next installment ;D

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Re: DH Venom
« Reply #34 on: May 18, 2006, 13:46:57 PM »
Don't panic Capt Mainwaring........................

Have been sidetracked recently due to work issues ( always a good excuse ) and repairing a model ARTF whose undercarriage mounts were just not up to the job, it had'nt seen any glue when it was constructed and the wood was the softest, nastiest that could have been used ! Therefore the Sbd u/c ripped out on a gentle landing taking the nose unit out with it. I'm not a happy bunny about that.  >:(

But now I'll be getting back on with the Venom :af

IB
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Re: DH Venom
« Reply #35 on: May 22, 2006, 23:16:17 PM »
If anyone is interested I know a chap who is trying to sell a part built MR Venom kit. It is located in Aberdeen, but the logistics of getting it somewhere else is not too bad as we both live toward the Lincolnshire area and visit many shows. Asking in the region of 270 but open to offers!

If you are interested then pls email me at; steve@tsxonline.co.uk

Also, if anyone wnats graphics for theirs then come an see me at the above address (or www.tsxonline.co.uk) I will offer roundels and lettering to any design in a special 'Low tack' paint mask material for 25.00 Guarranteed crisp and clean results.

Steve



On the build list...P-40, XP-55, Do335!, Grumman Goose, F4F, A-20, Me109e, Cougar, TSR2, Beaufort, Yak 3, Hurricane, Gee Bee R2, Super Sabre, B-58, P-80, Seafire

Offline john330

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Re: DH Venom
« Reply #36 on: June 30, 2006, 09:02:14 AM »
HI Ian,
It's been a long time since we've chatted.I finally flew my Venom in Bangkok the other day and it flew very well indeed.Unfortunately I did not get any piccys!(Too preoccupied)The only snag was the landing gear.It retracted fine but on landing the starboard main gear failed to extend.I think the Mick Reeves units are just not up to the task so they are coming out and are being replaced with units from PST.(pneumatic).No Damage,just a little scuffed paint on the tip tank.I'll be flying it again on the 16th and I'll try to post some pictures.It required some nose up trim and I think it may be a little nose heavy but it is balanced as per the plan.Did you have similar problems?The airplane came out quite light at 17 pounds ZFW and the PST 600 was more than enough grunt for it.I'll keep you posted,Cheers,John Vasil

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Re: DH Venom
« Reply #37 on: June 30, 2006, 12:22:05 PM »
Hi John

Nice to hear from you, long time eh? Glad you flew yours, I had eight flights with mine before I had an issue with three fail safe incidents in one flight culminating in a total write off. I am currently building another with different R/C gear and am using pneumatic units from Als Hobbies ( Jetpower Units ), these are good as I am using the same type in a Boomerang XL and they stand up to 32 lb landing weights fine. My Venom needed a couple of notches of down trim, this new one has the tail boom incidence reduced from 13 to 12 degrees to offset the trim issue, I'm currently sorting out a couple of other things but will be back onto the Venom build soon.

IB
A womans mind is cleaner than a mans.
She changes it more often.

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Re: DH Venom
« Reply #38 on: September 26, 2006, 02:27:48 AM »
After a spring/summer that has taken me away from building due to other issues I am back now in a position to carry on.

After joining on the wing inner panels to the fuselage I reinforced the join with 4 inch wide glass cloth top and bottom, this is more than sufficient to give a really strong attachment.



I now made up the tail booms, it was the intention by MR to use the wing and tail boom tube, which was to have been supplied in one piece, as a mandrell to jig the tail boom formers accurately. However, it is supplied pre cut to size so cannot be used so I used a tube I have spare from installing a bathroom shower unit, the rail the shower head can slide up and down. I added masking tape to the tube till it was the required thicness and then using a 3/4 inch ply sheet added blocks to support the formers at the required spacing and made up the boom support framework.



Finally, a trial fit into one of the tail booms



The formers and longerons are not all a snug fit inside the booms so soft 1/16th balsa is added to the formers edges and the outside of the longerons and carefully sanded down till the fit is correct, a little time consuming but it reduces the amount of glue required to seal the gaps.

The next step is to mark the positions of the formers and longerons on the outside of the booms with a felt tip pen and then using a long dowel with a felt wheel on the end apply Hysol to the inside of the booms where the marks are and sliding in the frame, once dry it is a very rigid structure. I also added 1/8th ply sheet as doublers to the first two formers to reinforce the holes the tail boom tubes slide in as repeated removal and use will open up the lite ply former holes, this has to be done before the frame is glued in as has the holes cut for the elevator push rods and the rudder servo cable, this is run down a series of drinking straws glued together. Two pushrods operate the elevator and each rudder has its own mini servo mounted below each rudder, Hitec 5125MG's.

IB
A womans mind is cleaner than a mans.
She changes it more often.

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Re: DH Venom
« Reply #39 on: September 26, 2006, 11:12:41 AM »
Ian, nice to see the build start again, looking forward to the rest  :af

Steve
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