Topic: db hurricane

hi guys anybody know where the cg is on a db hurry haveing just built one to the plan test flew on sat proper tail heavy
any ideas please

col

  Technical Data
Scale;  1:5.4 (17.5%)
Weight (typical);  9kg (20 lb)
Channels;  4-6
Engine; 25 - 40cc (depending on make)
C/G = 41/2" (114mm) from C/Sect  L/E.

mine had a Z38 with about a pound of lead in the nose...

thanks guys seems like lots of lead then it has a dl50 fitted

col

I am just finishing one at the moment,
It has a Fuji 50 and a good two pounds of lead.
Mine I would say, this is a guestimate is about 24lbs

Regards Phil G.

thanks phil  i think this one is about 23lb without lead

col

Mine was about 24lbs, they fly well with one aileron hanging off too! 

that would just about finish me off with this plane  lol lol

col

Col, out of interest, where was the C of G on the model you just flew that was so tail heavy? Just wondering because a guy on another forum said he had just totalled one due to extreme tail heaviness, and he said he had  balanced it as per the plans at 4 1/2"

we balanced it as per plan as well so tail heavy it was untrue i think it may need all all of 1 to 1 /2 pounds of church roof to get it wright once its repaired

col

Thanks Col I was interested because I have one of these to build soon myself. I've just had my plans out the box to have a quick look, and to be honest, the 4 1/2" looks very reasonable at around only a 1/4 of the wings chord. My smaller Hurricane flew really well with a C of G even more rearward than this

Dear Walts
I agree with you regarding the cg, it looks to be in a sensible place.
When I did the cg on mine it was at 4 1/2 inches back from the leading edge tanks dry
and the nose just slightly down. Having said that mine has not flown yet.

Col, what did your Hurricane feel like in pitch?
If it was very sensitive I would check the cg again,
if not it could be an incidence problem.

As an aside to this, when the real Hurricane was handed over to Martlesham Heath
to be evaluated by their pilots, it was judged to be slightly unstable in pitch for service flying.

Good luck with the Hurricane I am sure you will get it sorted.

Regards Phil G.

hi Phil she was super sensitive in pitch i don't think its a incidence problem my buddy who built  it for me is always on the ball re that sort of thing he was more upset than me when we had our mishap

col

I await the test flight of the Hurricane with some trepidation,
mind you I am like that with all the models.
I shake at the best of times, it's worse when I fly a model.

Regards Phil G.

Phil- the advice I have been given about mine (which is yet to fly) is keep the elevator movement down to a minimum, and never touch the elevator on landing until flaring for touchdown, ie bring it it in using throttle only. For a 'stable gun platform' it has a nasty habit of stalling....

Thanks for the advice bob, I will take that with me when my Hurricane finally gets to fly.
It does seem strange that the Hurricane with it's big thick wing is tricky in the landing phase.

My nephew had a MR Hurricane which was a bit chunky, he made a very small mistake in the landing phase.
It promptly dropped a wing and piled in from about 4 feet.

Thanks once again.

Regards Phil G.

hi phil good luck with your test fly hope its better than mine please keep me posted per the results

thanks
col

Thanks for the good wishes Col, I will keep you posted good or bad.
I am hoping the test flight will be the latter part of next week, if all goes to plan.
I am hoping the grand old lady will be sorted for the Tibenham bash.

Regards Phil G.

I have every faith in you Mr G. You will love it, and I look forward to seeing it at Tibenham. Maybe use it in our 3 ship
Cheers Richard.

Thank you for your kind words Mr S,
I am really looking forward to the three ship, all we need is the weather.

Regards Phil G.

I also have the DB Hurricane bought it 20 years ago, kept looking at all the bits and putting it back in the box again  finished it 5 years ago, mine has loads of lead and flys fantastic, cant remember the weight or cg, it's very docile and very forgiving, flys well up to 20 mph wind, the problem with mine is, fixed tailwheel so have to walk a lot, never do that again, and didn't fit flaps, another mistake, with low wind speed she comes in quick and goes on forever, but does lovely 3 point every time, i have cheap retracts and quite a plain paintjob for these days, it is a little small for major detail, ie weight, but i love flying this plane just wished i had changed those few bits, a great flyer  it is a Hawker you know 
Chris

Thanks Chris, that is a bit more encouraging.
I do have flaps and a stearable tailwheel on mine, I wish I had put the landing and navigation lights in it now.
I do have some rivet detail (not very well done)

Regards Phil G.

I might bring it along Phil to your do ! looking forward to that, not long now 

I look forward to seeing some of these Hurricane's at the 'do' then I take it your one Chris has the foam wing then if it's an older kit,....What about yours Phil, did you use the built up wing? My kit is also the older kit . I was talking to Eddie at Rougham and the built up wing kit definitely sounds worth the extra £125, so will probably be throwing my lumps of foam out, apparently the mod makes the model 5lb lighter! Hope to make a start on my one after the 82" Magister I'm 1/2 way through

Walt, mine is the built up wing version.
The kit and retracts were donated to the Coltishall memorial flight, by a then fellow club member.
Hence it is finished in 242 Sqn markings (Bader)
242 were  at Colt just after Dunkirk and in the early part of the Battle of Britain.

We must have some  Hawker slots.

Regards Phil G.

mine was built up wing too.

Mine is built up middle and foam outer panels, a strange combination. & yes mine flys on 1 Aileron too

That's the same as mine then Chris. I sort of resented the idea of spending £125 just to replace the two outer panels and I think I said as much to Eddie so the conversation didn't start too well He did however win me over when he explained just what you get in the wing kit,...Basically everything! Flaps, retract ready, hidden linkages, even the wing skins, It's all in the box apparently, will definitely be ordering one when I come to build it  

That sounds o.k. i seem to remember not much about the retracts area, hacking foam and glueing bits in, a bit of guess work going on, but i have had a few DB kits and plans in the past, good flyers

mine had foam wings but brought the wing kit from eddy at the nats a few years ago worth every penny
i think

just my 2ps worth

col

As an aside, what is the correct red for the gun patches on the Hurricane please?

Regards Phil G.

heres my hurri on lift off   at the start of the dreaded test flight

col

Col,
Your Hurricane looks very nice indeed, I am sure you will get it sorted.

Regards Phil G.

It does indeed look nice Col, good luck with the repairs

thank guys hope to be flying her soon

col

Hello,
I am building a P-47 of 82" wing span. It will have pneumatic tail wheel with tail doors.  I cannot visualize how to get the steering pull pull system to go tight or slack in either the down or stowed positions.  The tail wheel has a control bar that will turn the wheel and all that is simple.  I have never had to do this and I cannot visualize the solution.  Seems to me a spring or springs in line is the ticket.  The steering on the tailwheel is by a typical T bar that I will have to route pull pull lines in a tight curve to drive the tail via a dedicated servo up front.  I could use the rudder too, but the keeping the cables tight and loose is something I cannot solve.  Gracias , Albert , USA.

Have you seen this?

<a href="http://www.youtube.com/watch?v=35y2G8FDMA8" target="_blank">http://www.youtube.com/watch?v=35y2G8FDMA8</a>

my hurris all repaired built a big balance jig to balance it on soooooo test flight again soon
keep all your bits crossed
cheers
col

hurry all balanced up we put 3 lbs 2 oz of lead on the front wow. test fly soom had a flood in my celler/workshop poxy watermeter next doo,r saved all my stuff im pleased to say

col

Col,
How did you fix your leg doors , on please?

I am hoping my Hurricane will finallyl fly on Thursday or Friday of this week.

Regards Phil G.

we used sillicone on the back of the doors seems to work just fine