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May 27, 2019, 12:34:58 PM

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Author Topic: What Balsa build  (Read 8708 times)

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Offline slopeflyer

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What Balsa build
« on: April 27, 2012, 20:35:27 PM »
All this talk of balsa building has given me an itch to get balsa building.
Choice is between an Omega (Colin Chapman) or the Phase 5.
I'm leaning towards the Omega, as I've previously owned one and it's a nicely proportioned looker.
Something fully built up, but with reasonable aerobatic performance.
Cheers,
J.


Offline tadleysoarer

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Re: What Balsa build
« Reply #1 on: April 27, 2012, 21:14:13 PM »
With modern cutting facilities and computers there are quite a few kits on the market. PMP are doing some, there are still the MP and P6, Island Models do the Quark 2M which is reviewing well. P5 is a good model and most folk say better than P5. You could design your own.

Hope when you decide you do a build log,

Tad
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Offline One Life Fly It

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Re: What Balsa build
« Reply #2 on: April 27, 2012, 21:56:40 PM »
Why not finish your Phase 5 ? I'm sure you started it I seem to remember pics of tail  :) after my holiday I am gonna embark on building 3 by September  :D
Here for a good time , not a long time !


Offline slopeflyer

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What Balsa build
« Reply #3 on: April 27, 2012, 22:09:19 PM »
Here's the omega.

http://www.myhobbystore.co.uk/product/16080/omega-model-aircraft-plan-rc1197

My last one was way too heavy. But flew superbly.

4 modern lightweight servos and build and it'll be good. No flaps, but saves weight for the light wind aeros.

Offline slopeflyer

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What Balsa build
« Reply #4 on: April 28, 2012, 11:12:01 AM »
Ok. Decision made. Made a start on the omega. Will do the build log here. I've chosen this because I've made one before, I know it's good and aerobatic in light and heavy winds.
I'm going to try to build this light, especially the wings. My only confession to weight will be the addition of 3/16 fuse sides and 1/32 ply laminate down the full fuz length, as the original tail was quite weak.
The original design was quite fat, to accommodate the old style servos. So I'll take apprix 1 inch of the width to reduce drag, and make it a little more 'fishy'. I'll be using some lightweight servos close inboard innthe ailerons which I will make full length, will keep the wings stock as they are strong and light.
Elevator/rudder will use the carbon rid in snake sleeve method as on the Crack yak, for lightness. I may add a ballast tube on this one as UT did also fly well heavy, and in quite strong wings, but when the wind drop ped was good at the thermals.
She has a nice big light rudder so I'll keep that. Will also keep the composite joiner, which was effective. I may strengthen the dbox with some carbon on the spats for stiffness as a wing fold, was the demise of the last omega.
Cheers,
J.


Offline slopeflyer

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What Balsa build
« Reply #5 on: April 28, 2012, 11:17:54 AM »
Ballast, I'll try to make a box that will take the ballast from the GV 60.
Carbon reinforce the inner 6 inches of the main wing spar.
I will also be going for the semi symmetrical e374 section, not the symmetrical.

Offline slopeflyer

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What Balsa build
« Reply #6 on: April 28, 2012, 11:41:45 AM »
Deciding how to make the fuz formers determines the width. Clearly need to accomodate the gear.
As you can see using modern gear, I can really thin this fuz out. Rx in rear section is even an option though perhaps not ideal. (by masking tape). Bart is 4aaa under rx at present. Fuz width, need to be batt width at widest part.


Offline slopeflyer

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What Balsa build
« Reply #7 on: April 28, 2012, 11:46:15 AM »
Fuz also needs to accommodate gv 60 lead. See pics.

Offline slopeflyer

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What Balsa build
« Reply #8 on: April 28, 2012, 11:53:24 AM »
Careful planning pretty important here as space is gonna be very tight.  The centre section is going to have a wing joiner as it is mud mounted wing.
I could also use one of the lipos from the yak, meaning I could move the batt farther forward yet keep the fuz skinny.


Offline slopeflyer

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What Balsa build
« Reply #9 on: April 28, 2012, 12:17:50 PM »
Everything fits, the fuz is kept skinny. The only change will be to add a lower hatch under the wing and the ballast will be attached 'under' the wing joiner. That way the install can be kept 'uprught' and accessible with the pushrods running over the wing joiner. Can fit either a 4aaa or a lipo.
I will cut the custom fuz formers as the next job to 'fit' in the gaps.

Offline slopegod

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Re: What Balsa build
« Reply #10 on: April 28, 2012, 12:28:24 PM »
Careful planning pretty important here as space is gonna be very tight.  The centre section is going to have a wing joiner as it is mud mounted wing.


Could you give more details of how you mud mount a wing.
One of eleven.

Offline slopeflyer

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Re: What Balsa build
« Reply #11 on: April 28, 2012, 12:36:18 PM »
Mid Mounted, that is the wing is mounted in the side of the fuz. See pic. Consequently, the pushrods need to go over or under the mount.
The ballast will attach to the wing mount since it is composite and on the CG.

Offline slopeflyer

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What Balsa build
« Reply #12 on: April 28, 2012, 13:55:57 PM »
I've cut the formers. Saved 30mm on the fuz width. I've also cut guides for the snake tubes in the fuz formers, and dry run fitted the snakes to ensure the geometry lines up nicely. It should be quite a bit lighter than the standard build as all the gear now is well in front of the CG.

Offline slopeflyer

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What Balsa build
« Reply #13 on: April 28, 2012, 17:40:45 PM »
Started on the tail. It's a hollow tail with a moving bellcrank, see pic. I need the tail as this goes between the fuz sides on gluing. I've laminated a spruce/balsa cross grain fin post in this case.

Offline slopeflyer

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What Balsa build
« Reply #14 on: April 29, 2012, 16:55:26 PM »
Not much done today, day off.
I did glue the fuz together. The tail is not attached just in situ. Will leave to cure overnight.
I like the looks of the new skinny omega, looks like your average mouldie.

Offline SteveBB

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Re: What Balsa build
« Reply #15 on: April 29, 2012, 17:10:11 PM »
Many years ago when I mooted with myself about getting into R/c, the Omega was a plan I looked at getting. Obviously it isn't a training glider, but my ambition exceeded my non abilities. I didn't send for it though.
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Offline slopeflyer

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What Balsa build
« Reply #16 on: April 30, 2012, 12:43:51 PM »
Decided to beef up the rudder as the last one developed a warp.
It's a pretty thing.

Offline slopeflyer

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What Balsa build
« Reply #17 on: April 30, 2012, 20:33:34 PM »
Elevators are split half built up construction. Connected via a
Crank.



I've added the front nose block and generally sanded the fuz a bit.

Good to have something to build when lousy north easterlies look like im grounded for a week.


Offline slopeflyer

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What Balsa build
« Reply #18 on: May 01, 2012, 17:04:02 PM »
Not much done today. Just a bit of sanding of the rudder/elevators.

Been busy repairing the crack yak, which I bust in the park earlier today. Oh the joys of Epp repairs, coupla bits of cyano and she's a goodun. And I mention the knife edge! It's epic.

No clutter? I Wanted some woodglue frpm wilko and came out with that and some nice new storage boxes from wilko.

Offline One Life Fly It

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Re: What Balsa build
« Reply #19 on: May 01, 2012, 22:11:32 PM »
Do you  work or just build planes ?
Here for a good time , not a long time !

Offline slopeflyer

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What Balsa build
« Reply #20 on: May 01, 2012, 22:31:11 PM »
Flew the yak again at dusk.
A little more cyano required. :(
I think I need to be more careful with the Omega.

Offline slopeflyer

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What Balsa build
« Reply #21 on: May 02, 2012, 10:52:07 AM »
Time to start thinking about the wings. I'm heading to Argos today to buy a digital scale so I can accurately measure the parts. Want to get this light.
I'm considering adding an additional spruce spa at the top of the wing, since the last crash was due to a fold 1/3 way along the main spa. I need to order some more balsa anyway as I've ran out of 3/16 sheet for the stab.
Perhaps I should order enough balsa for the phase 5 as well? That's my excuse, save on the postage right?
Off to the park now for a quick whizz with the yak.

Offline w8racer

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Re: What Balsa build
« Reply #22 on: May 02, 2012, 11:09:12 AM »
When I was slope soaring I always fancied building an Omega.

It still looks very stylish although it was designed a long time ago now - late 70s/early 80s? I have the original magazine article somewhere.
Robert Welford

Offline slopeflyer

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What Balsa build
« Reply #23 on: May 02, 2012, 11:43:11 AM »
Yes w8. There's nothing like seeing the built up construction in the air, when the light shimmers through. The tail is particularly pretty in the air. It flys very well too. I hope I can address the shortfalls I found last time round with this build.
Perhaps you could dig out the article?
Thx, Jimbo.

Offline w8racer

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Re: What Balsa build
« Reply #24 on: May 02, 2012, 12:35:04 PM »
Perhaps you could dig out the article?
Pm me your email address and I'll send you a scanned copy - when I find it.

Jim, are you using the aluminium tongue type wing joiner?
Robert Welford

Offline slopeflyer

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What Balsa build
« Reply #25 on: May 02, 2012, 13:23:53 PM »
Yes w8, I will be.

Offline slopeflyer

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What Balsa build
« Reply #26 on: May 02, 2012, 20:24:56 PM »
Moving along slowly here.
I've covered the front section bottom with cross grain 1/8 and flatted. I really like the looks of the much much skinnier fuz.
I've picked up a nice straight hard balsa for the tailplane. I selected it from about 10 at the LMS. Weight of the full sheet was 60g, which makes my stab come it at 20g. Ive added 3/16 cross grain end caps to add some torsional rigidity to the and help stop the warping.
Next todo is sculp that sexy hatch from 1/2 inch.

Offline slopeflyer

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What Balsa build
« Reply #27 on: May 03, 2012, 11:52:37 AM »
First dry assembly of the tail end. I suspect this is the most tricky part of the build notwithstanding I have to get it straight and true.

Offline slopeflyer

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What Balsa build
« Reply #28 on: May 03, 2012, 16:42:22 PM »
I've glued up the rear half of the hatch. It's going to be attached in two parts as per plan. Then the whole block is sanded. You can see the pretty contours of the nose a bit now. It's pretty much seat of my pants stuff here as my mods to the fuz have made this all custom build here. Lovely stuff this balsa.

Offline slopeflyer

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What Balsa build
« Reply #29 on: May 03, 2012, 20:10:44 PM »
The hatch is made up of 1/2 and 1/4 inch stuck together to make the curve, with 3/16 inch sides. Ive extended the height by about 10mm to make it a bit more fishy. I'll wait for it to dry and sand tommorrow.

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Re: What Balsa build
« Reply #30 on: May 03, 2012, 21:18:52 PM »
Looking good so far Jim; your workbench is nowhere near untidy enough.  :af.

.Mine looks like a bomb's hit it just after I've tidied things away.

re: Tail straight...Fin first..If you can, use a laser, draw a line down the LE of the fin, sight it with cocktail sticks pushed into the centreline of the top fuz..

When it's all true, clamped and glued up, then put the stab in..measure each stab tip to the fin, which you know is true.
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Offline slopeflyer

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What Balsa build
« Reply #31 on: May 03, 2012, 21:41:00 PM »
Thanks Steve, I've forgotten how much I like building out of balsa.

Here's the completed hatch. I'll sand tommorrow, if I get a spare minute or two.
Re bench it was bad but I went to wilko and bought a bunch of stacking storage. What a difference!
Now if i could sort out the wing/fuz storage..
« Last Edit: May 03, 2012, 21:52:50 PM by pilot_jimbo »

Offline slopeflyer

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What Balsa build
« Reply #32 on: May 04, 2012, 11:56:34 AM »
Here's the sanded hatch. I've added a ply tongue to the rear of the hatch to secure it. The front will be a catch.
Next job is to attach the tail and sort out the servo install for the fuz.
I won't be using the torque rods as per plan. I have some hs85s or es08s I'll mount in the wings to control the rons.
I need some 16 guage dural for the wing tongue. It is a 1/16 ply 16 dural composite tongue.

Offline slopeflyer

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What Balsa build
« Reply #33 on: May 04, 2012, 12:35:31 PM »
Next task is to align tje rear fuz and add the lower cross grain. I've aligned the fuz as per plan and added a scrap spruce spacer for the rear fin. I'll cyano the first piece then glue the rest, for accuracy.

Offline slopeflyer

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What Balsa build
« Reply #34 on: May 04, 2012, 12:46:20 PM »
Balsa applied and clamped in position.

Offline slopeflyer

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What Balsa build
« Reply #35 on: May 04, 2012, 21:15:11 PM »
Ok I'm happy with the straightness.
Straight as a die :)
Sand tommorrow.

Offline FWAL

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Re: What Balsa build
« Reply #36 on: May 05, 2012, 09:10:39 AM »
Nothing better to see than a big fat old bird being slimmed down for more modern gear!
I did this to a Middle Phase last year and as you are probably aware by now they look really modern and slippery by balsa standards.
Looking forward to seeing it fly
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What Balsa build
« Reply #37 on: May 05, 2012, 10:58:41 AM »
Yep, it certainly was a fat old bird, not any more, sleek is the word!

Next step is install the tail and the rudder/elevator linkages.

Elevator is a bell crank assembly. I will install the servos/then the rods/then the tail linkages dry, then glue everything in position.

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Re: What Balsa build
« Reply #38 on: May 05, 2012, 12:50:06 PM »
I thought you were trying to keep the weight down.......... adding the bellcrank assembly to the tale is going to cost you at a guess 20+ grams of additional nose weight!
Keep it simple
Keep it light
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What Balsa build
« Reply #39 on: May 05, 2012, 13:58:27 PM »
I thought you were trying to keep the weight down.......... adding the bellcrank assembly to the tale is going to cost you at a guess 20+ grams of additional nose weight!
Keep it simple
Keep it light
Hmm your comment got me thinking.
I put all the tail assembly and added the batt/rx up front. Then balanced it on the CG.

Rather a lot of lead required to balance. :(


 

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