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1/2 scale Druine Turbulent

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Glenn Ryan01/11/2017 04:48:19
45 forum posts
1 photos

Hello. Just seeing if there is any updates to this build?

reg shaw27/10/2018 22:07:57
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629 forum posts
559 photos

Blimey, just remembered and found this!! No updates as yet but I hope to restart it next. Been a busy couple of years with house moves, workshop builds, narrowboat restoration etc and other stuff going on so toy aeroplanes have been sadly neglected. I think I have all the materials to get it done so fingers crossed!!

Ian.

Geoff Sleath27/10/2018 23:29:51
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3017 forum posts
247 photos

They seem to be popular. There was at least one at the Ashbourne scale day last Sunday and I think there may have been two. I know they're big planes and easy to count but you must allow for my dotage

I dodder along as a retired gent and build the odd smallish model and young Redshaw, gainfully employed, turns 'em out with one hand as he uses the other to build massive workshops and repair narrow boats.

Geoff

Tom Sharp 228/10/2018 00:31:09
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3243 forum posts
17 photos

I think there was three Turbulents at Ashbourne, two dark coloured ones and a bright red one.

I Think.!

reg shaw06/12/2018 14:22:17
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629 forum posts
559 photos

After a bit of time doing other stuff, I have had a bit of time to do the final bits of research to get the doodles finalised. Lucky for me, G-APNZ is undergoing restoration not too far from me at Derby Aero Club. A phone call and a few emails finally gave me the go ahead to venture over with a tape measure and a camera to discover the differences between this Turb and my initial drawings.

The main differences lie in the top deckings ahead of the cockpit and engine cowling profiles. PNZ has a deeper top deck as it has a long range fuel tank fitted, and the cowlings on Turbulents are different on every one. Indeed this one in it's history has had three or four different profiles fitted, with bumps and bulges to cover extra bits bolted to the 1500 VW Beetle engine.

Derby Aero Club were very accommodating, even giving ME permission to remove the seat structure and refit the engine cowlings for a better look! I took with me a list of all the measurements I wanted, and another list of the images I needed to get, although I promised not to 'publish' too many pictures. I've corrected the drawings and designed an unobtrusive method for 2 piece wings whereas the full size has a one piece wing that the seat base, joystick etc all mount to.

I've had a quick look at the materials needed and I have most of the acres of plywood required for the skinning of fuselage and wing leading edges etc. I have no steel tube though for the U/C yet though, but it'll be a while 'til it needs it's trottery.

Also, found this thread a while ago that has some great detail photographs of a Turbulents innards.

**LINK**

More hopefully sooner than later,

Ian.

Martyn K06/12/2018 16:36:34
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4760 forum posts
3436 photos

That full sized Druine link is a superb restore blog Ian. Explains how aircraft were stitched and why.. Now I understand

Geoff Sleath06/12/2018 20:06:27
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3017 forum posts
247 photos
Posted by Martyn K on 06/12/2018 16:36:34:

That full sized Druine link is a superb restore blog Ian. Explains how aircraft were stitched and why.. Now I understand

Ye it is a very interesting thread but I still don't know how they stitch the other side of the wing when you can't get at both sides of the fabric.

Geoff

reg shaw06/12/2018 20:33:46
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629 forum posts
559 photos

Hopefully this image answers that Geoff. Image from that superb resto thread I linked.

Ian.

bert baker06/12/2018 23:33:47
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1234 forum posts
267 photos

trub+.jpg

reg shaw10/12/2018 23:13:46
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629 forum posts
559 photos

The main stumbling block in this very simple design is the wing join and mounting to the fuselage. The full size has a one piece wing, four bolts hold it on, two through the front spar and two through the rear. There isn't a top skin on the wing in the cockpit area, so all you see is a one piece main spar, and behind it the joystick is bolted down to some timbers on the top of the bottom wing skin.

It would be easy to have a one piece wing and it would be 'manageable', but it would limit what else I could take to fly, a two piece centre join would be next easiest, but the differences in the cockpit would be obvious and I'd have to connect the joystick up every time the model was assembled. Also a centre join would make the underside of thing at that point more difficult to build as the bottom skin 'flows' from side to side, ie, no kink at the dihedral break.

So I decided to make the wings plug in leaving the cockpit area untact when the wings are removed. I've made up the main spar stubs which will now allow the wings to be started. There is a wooden square tube to be made up and built into the fuselage. This has the external dimensions to match the full size spar, the internal dimensions accept the stubs on the wings. These stubs are cut from 9mm beech sheet in the middle, with 6mm birch ply faces on opposing sides of each. The beech component has a fancy cut involved which makes a tapered dovetail joint which when slid together makes a very rigid joint. When combined with the good fit (hopefully !!) in the fuselage box it should take all the loads from flying, landing etc without issue. This little lot was assembled with Araldite and panel pins and cleaned up whilst the glue was still wipable, hence the bloomin' mess!!

Ian.turb stub spar.jpg

turb stub spar1.jpg

turb stub spar2.jpg

turb stub spar4.jpg

turb stub spar5.jpg

turb stub spar6.jpg

reg shaw10/12/2018 23:23:40
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629 forum posts
559 photos

turb stub spar5.jpg

 

This pic shows the two stubs together. The narrow bit in the middle is where the fuselage box will be. The birch ply plates are at the moment on opposite faces of the spar, ie. one on the front and one on the rear (making a full spar in the fuselage box), but there will be one on each side eventually, but they aren't required at this stage. The U/C mounting brackets are all mounted to this spar, the oleos towards the outer ends of the stubs and the main U/C gubbins further inwards, at the fuselage joint almost, hence the beefy structure around this area.

Edited By reg shaw on 10/12/2018 23:38:43

cymaz11/12/2018 05:09:41
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7992 forum posts
1053 photos

Good to see you building again yes

Piers Bowlan11/12/2018 08:51:31
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1513 forum posts
41 photos

That is very neat Reg, I could have done with with that system on my full size Turbulent G-AWMR. Would have been nice to have been able to take it home to work on it in the wintertime instead of working in a freezing cold hangar.

Following with a lot of interest and a tinge of nostalgia!

Geoff Sleath11/12/2018 11:47:15
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3017 forum posts
247 photos

This looks great, Ian. I hope you'll turn up one Wednesday evening with a few pieces for us to admire.

Geoff

reg shaw11/12/2018 12:11:21
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629 forum posts
559 photos
Posted by Geoff Sleath on 11/12/2018 11:47:15:

This looks great, Ian. I hope you'll turn up one Wednesday evening with a few pieces for us to admire.

Geoff

Every chance of that Geoff, when's the next one? Mr Poyser Rob Shipton and I were just talking about coming to the next, definitely not for the mince pies though you understand?

Cheers, Ian.

Geoff Sleath11/12/2018 15:27:45
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3017 forum posts
247 photos

I think it's next Wednesday Dec 19th. Hope to see you all there, even if only for the mince pies

Geoff

Geoff Sleath11/12/2018 20:42:33
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3017 forum posts
247 photos

For anyone tempted by Ian's build but at a more modest scale, I notice Peter Miller designed a 58" version that's on Aerofred Plans service. Or perhaps Peter might sell the plan himself so he gets some credit for his efforts.

 

Turbulent Plan and article

Geoff

Edited By Geoff Sleath on 11/12/2018 20:43:39

reg shaw12/12/2018 19:57:31
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629 forum posts
559 photos

The wing mainspar centre section has now been completed, with shear webs added to beyond the U/C mounting positions, the simple wing can now be built onto it.

turb spar 7.jpg

turb spar 8.jpg

turb spar 10.jpg

The rib spacing is all the same after the root rib so its a simple case of shear web, rib, shear web, rib etc etc... making sure to add the correct rib and the correct amount as the spars are over long at the minute! The shear webs are abviously all the same width too, just front and rear spar depths to think about. When I drew up the ribs in ProEngineer they were done to allow for the aileron, slot etc so there are quite a few different ribs to pick from when assembling! Full ribs, ribs without a front, ribs with an aileron, ribs with and aileron and a slot.... Lets see what comes out!!

turb spar 9.jpg

dscf7284.jpg

reg shaw12/12/2018 22:34:36
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629 forum posts
559 photos

Fairly productive couple of hours, managed to start building two left panels, another with anhedral and one with a shorter aileron, but eventually settled on the right amount of bits in an opposing pair of wing panels!! The bulk of the ribs and shear webs are mounted on the main spars, left off the first two ribs at the moment as I need to drill for the U/C mounting brackets, but need to make them first. I also aint too sure what happens at the rib that sits under the fuselage side yet so will probably leave that until I have a fuselage side for it to sit under, since the curve of the side will govern the position. Its pleasing how square the structure is even though there is so little of it, mainly due to the lasered ribs and the batch produced shear webs. The spar material is cyparis from Solutions, very accurately cut and glues up a treat. I'm using medium cyano for the bulk of the assembly, though the spar stubs and root shear webs were araldite epoxy. Work drew to a halt as I realized I have to machine a quarter round section of the lower rear spar, to form the start of the aileron shroud, and its a tad late to get the router out!

Ian.

turb wing3.jpg

turb wing4.jpg

turb wing2.jpg

turb wing1.jpg

Glenn Ryan13/12/2018 00:01:42
45 forum posts
1 photos

Hello Ian,

I don't recall seeing but what's going to be the motive power for this awesome aircraft?

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