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Author Topic: Early Caudron biplane for indoor rubber  (Read 17437 times)
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Pete Fardell
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« Reply #325 on: March 19, 2017, 05:38:07 PM »

Thanks, Dave, for putting such a nice spin on my approach. "Solved problems along the way" sounds so much better than "failed to come up with a proper plan before he started"!  Grin

I think the cross brace was designed to flex at the fins and at the control horns. It certainly didn't slide up and down the fin leading edge on the full size. It may be possible to make a 3 piece brace using nylon line for the flexible bits.
I think you're right- but the range of adjustment was much less on the real thing, and the conrol horns were far less conspicuous. Once mine is trimmed I'll cut them down so they're less obvious.
My arrangement is already quite flexible because, as with the struts, I've got a thin carbon core to the balsa cross piece and have cut the balsa away where it crosses the tailfins. Pretty much what you suggest with nylon in fact. It will flex, but I think it will look wrong if it's not straight.
Here's a pic of the real thing on a G3 (albeit a slightly different setup).

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Pete Fardell
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« Reply #326 on: March 19, 2017, 05:58:47 PM »

On the Type F the crosspiece should really cross between the rudder and fin. I'm going to do a bit of surgery again as the way I've got it now is wrong. I need to move the fins forward so that it lines up.
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Pete Fardell
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« Reply #327 on: March 19, 2017, 06:36:46 PM »

I decided not to move the fins forward, as that would have meant cutting a bit off their front edges, but instead changed the angles of the upright pieces at the back of the booms. It all lines up better now, at least with the tail at the current setting. The crosspiece looks pretty thin in that last photo I posted so I think I might dispense with the balsa and just use a piece of carbon like this, or maybe wrapped in a layer of tissue to make it a tad thicker and paintable.
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Mefot
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« Reply #328 on: March 19, 2017, 06:54:25 PM »

Let's hope you don't have to change the tailplane setting !!!  Smiley

You must be very nearly finished now.

I'm anxious to find out how it flies  Smiley
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Pete Fardell
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« Reply #329 on: March 19, 2017, 07:22:13 PM »

I can still change it. The tailplane is still loose on the booms and the adjuster gizmos still work (and the carbon will flex).

I just need to get it finished enough to try it on Friday. Not sure whether to add any rigging before then. It will be easier to trim without it, but then again if it flies without it I'll be worrying about the increased drag when I put it on.
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Tim Horne
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« Reply #330 on: March 19, 2017, 07:33:42 PM »

It's looking very good Pete, I wish I could go on Friday but some of us have to work  Wink Sad.

I really hope you get it flying after all your hard work.
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Mefot
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« Reply #331 on: March 19, 2017, 07:49:53 PM »

I would be tempted to add the wing rigging because of the drag, but leave off the control wires as that will allow easier tailplane and rudder adjustments.
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OZPAF
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« Reply #332 on: March 20, 2017, 03:43:45 AM »

Well good luck with it on Friday Pete - it looks very atmospheric.
A thought just occurred to me re the cross bar on the tail. Why not leave it off until it is largely trimmed and then attach it to the vertical uprights.
You have probably already considered this.
John

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Pete Fardell
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« Reply #333 on: March 20, 2017, 04:27:12 AM »

I have, but it's a necessary part of the structure because it keeps everything square. Apart from the tailplane itself, there are no other solid crosspieces between the booms. That said though, there will eventually be a few rigging wires which could be made to pull their weight I suppose.
The carbon crosspiece is okay where it is now though, at least when the tail is set at either of (what I consider to be) the two most likely trim settings.
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OZPAF
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« Reply #334 on: March 20, 2017, 04:37:31 AM »

That sounds good - relax until Friday.

John
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Pete Fardell
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« Reply #335 on: March 20, 2017, 04:46:56 AM »

Can't quite relax yet- struts need sanding to shape, staining and gluing in and I also need to make a bespoke winding stooge as it certainly won't fit in a normal one.

It's looking very good Pete, I wish I could go on Friday but some of us have to work  Wink Sad.

I really hope you get it flying after all your hard work.

Cheers Tim- real shame you can't make it. It's annoying how work gets in the way of real life. I should have been working too really. The only reason I can go is that I persuaded Carole to swap a day. This means I'll be working on Tuesday instead, which could be a bad shock to my system!
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Pete Fardell
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« Reply #336 on: March 20, 2017, 07:19:38 PM »

Here is the harvest from my strut farm. I put them in the sophisticated strut holder to keep them in the right order for putting them back into place.

Wheels now on too. Burnt myself on the soldering iron, but only once so not a bad effort. Will post a better pic or two tomorrow and maybe add some rigging.
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Pete Fardell
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« Reply #337 on: March 20, 2017, 07:46:13 PM »

One more for now...
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Mefot
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« Reply #338 on: March 20, 2017, 07:50:16 PM »

That's really starting to look the part now. Particularly the shot of Chanteloup at the top of a loop !!!  Grin
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Pete Fardell
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« Reply #339 on: March 20, 2017, 08:17:56 PM »

I think I've now rectified the upside down photo. They'll be no loops if I can help it!
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Rich Moore
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« Reply #340 on: March 21, 2017, 02:53:07 AM »

That looks fantastic. You are a master at capturing the charm and character of an aeroplane.
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« Reply #341 on: March 21, 2017, 05:30:52 AM »

Hey Pete, thats a realy nice plane!
All these struts... I would go crazy to adjust them all Roll Eyes
Roman
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Prosper
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« Reply #342 on: March 21, 2017, 07:23:22 AM »

Looking really good Pete. Good luck if you fly it on Friday. You certainly don't pick the easy subjects, do you?
Quote from: Pete Fardell
"Solved problems along the way" sounds so much better than "failed to come up with a proper plan before he started"!  Grin
It is better, I'm sure. An object as weird and complex as this can't be properly planned, in the sense of fully 'mentally modelled' (either in shape or stress) before you start chopping timber, so the ability to stay agile and adaptable in order not to be floored by the inevitable emergent difficulties, seems to me indispensable when scratch-building. It does lead to long periods of gazing at bits of model whilst making funny grimaces and scratching the noggin - but maybe that's just me Cheesy.

Stephen.
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abl
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« Reply #343 on: March 21, 2017, 07:35:41 AM »

Wow. That looks really good. Also, really quite complicated...  Smiley

Best of luck with the test flights.

Andy
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OZPAF
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« Reply #344 on: March 21, 2017, 07:02:10 PM »

Good luck with it Pete - it's a charismatic effort.
Now to props and motor runs?

John
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Pete Fardell
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« Reply #345 on: March 21, 2017, 07:06:50 PM »

Thanks for the kind words.
Yes- some motor tests soon. There is plenty of room for an 8" diameter grey Peck type, and I could probably go 9" if I wanted to. Bigger usually seems better, but will trimming be easier with less torque?
Alternative to the Peck is one of the orange Chinese jobs.
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Pete Fardell
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« Reply #346 on: March 21, 2017, 08:14:31 PM »

Tonight's job though was rigging. This is just grey cotton thread, which is not as stretchy as my usual shirring elastic innards (of which Bill gave me a good supply). However it us hard to get the shirring elastic thin enough unless you stretch it very taught, and it is heavier stuff altogether. This thread is probably too thin really, and I've only added a fraction of the spider's web of wires on the real thing, but I'm hoping that this 'impression' of rigging is better than none at all.

Weight is about 52g. The prop will add another 6 or so.
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Jack Plane
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« Reply #347 on: March 22, 2017, 03:27:56 AM »

She gets more lovely each day!
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billdennis747
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« Reply #348 on: March 22, 2017, 03:33:16 AM »

The rigging brings it to life, Pete. Glad you didn't use the shirring rubber because, yes, it's too thick for this and it deteriorates over time. You only want to do this once.
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OZPAF
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« Reply #349 on: March 22, 2017, 06:09:22 PM »

You didn't use a scale hand Pete Smiley I think the rigging looks right - nice shot from the front.

John
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