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Druine D.31 Turbulent

Slow- and Parkflyer

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Piers Bowlan03/11/2017 12:29:51
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1239 forum posts
36 photos

That was an interesting and amusing article Timo, so thanks for that. One of the endearing features of the Turb was it's simplicity, which meant that there was very little to go wrong. No starter or even a battery, so no radio or lights. No brakes (on mine), no steerable tailwheel, just a skid. Also, no canopy or wheel spats, so I had the slowest, lightest Turbulent in the world! The 'fuel gauge' was almost comical (a wire attached to a cork sticking out of the fuel cap) but was very practical and compelling too.

I had taken off from Dounreay (Thurso) in Scotland, flying West to Cape Wrath before heading South in glorious sunshine and amazing visibility. The headwind I encountered however was much stronger than forecast and I soon found myself being overtaken by the seagulls! The scenery was majestic as I flew low along the deserted beaches in an effort to stay out of the worst of the headwind. It was just over three hours before I landed on The Isle of Skye, the little wire poking out of the fuel tank was now barely in view! blush

Timo, I like the scale detailing, don't forget the pilot though!

Timo Starkloff05/11/2017 08:32:12
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231 forum posts
545 photos

Thanks for the story! Sounds great, the Scottish coastline and a small Turbulent

I just recently read about Cape Wrath in the book about the Vulcan and the Falklands for training.

This week I finished the wheels, a bit stiff but with 8 grams much lighter than the 37 grams of the previous wheels. And I added the canopy for better aerodynamics when flying indoor. The shape of the canopy was really easy in the end, which is what Roger Druine intended for his plane, although the look is great.

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Timo Starkloff05/11/2017 08:34:54
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231 forum posts
545 photos

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Timo Starkloff05/11/2017 08:56:12
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231 forum posts
545 photos

Previous test flights were helpful since I didn’t have to change the settings for indoor flying. The Turbulent behaves just fine. The flaps are constantly deployed 45 degrees. The good manouverability is absolut necessary and a good part of the fun. In ground effect you can easily scratch the floor with the wing tip. So the only task for me was, to get used to flying inside rooms again. The Turbulent did really fine.

The gym is about 43x28 meters big. A small video can be found here:

**LINK**

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Timo Starkloff05/11/2017 09:04:57
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231 forum posts
545 photos

And I will surly add a pilot, Piers!

McG 696905/11/2017 18:59:08
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2074 forum posts
887 photos

Splendid achievement, Timo.

Respect & congratulations.

Cheers

Chris

Timo Starkloff12/11/2017 16:06:37
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231 forum posts
545 photos

I added more details this week. Nice work to do, because it's quick and easy for such a small (and slow) model and improves the look a lot.

For the hinges and control linkages I had the idea, if I cannot hide them, I make the best out of it and paint them silver. So it looks like they are metal parts of the original.

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Edited By Timo Starkloff on 12/11/2017 16:30:10

Timo Starkloff12/11/2017 16:09:13
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231 forum posts
545 photos

And I went indoor flying again today (no chance for flying outside with typical cold and rainy November weather). Everything was fine again and I made a test flight with the big 3S1200 accumulator. It worked, although the speed was slightly higher. As expected, the 3S450 is much better for indoor flying, but the model itself has some capabilities.

Edited By Timo Starkloff on 12/11/2017 16:09:41

Edited By Timo Starkloff on 12/11/2017 16:10:07

McG 696912/11/2017 21:54:44
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2074 forum posts
887 photos

Absolutely great, Timo.

But if you allow me, that splendid VW flat four also needs some typical airplane exhausts... wink

Cheers

Chris

Timo Starkloff14/11/2017 22:43:08
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231 forum posts
545 photos

That boxer will get tubes and exhausts for sure, Chris. As with the cockpit, I’m just halfway to the finish.

Today I started making the seat.

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Edited By Timo Starkloff on 14/11/2017 22:44:23

Timo Starkloff19/11/2017 20:54:20
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231 forum posts
545 photos

I started preparations for the pilot. Since I have plans for at least one other model in 1/6 scale, I made a template from plywood. I use it for checking the position in the cockpit, then transfer the silhouette on foam to cut the 3D figure of the pilot.

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Timo Starkloff06/12/2017 21:26:49
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231 forum posts
545 photos

What about a nice pair of ski? Last weekend we‘ve had the first snow. It’s already gone, but I want to be prepared for the next time. Even the original Turbulent is flown with ski (and with floats, but that’s something for next year, maybe).

The first job is to make a model for the ski from plywood.

Not much progress on the pilot and exhausts, yet. There were other things to do. I was flying indoor again a week ago, something which works better each time. I still need some more accumulators and maybe I try 3S350 35C. This would spare another 10 grams, to be spent again on the pilot.

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Timo Starkloff07/12/2017 15:38:00
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231 forum posts
545 photos

Two sheets of 1mm balsa applied to the master form and glued together with wood glue look a bit like a hedgehog.

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Timo Starkloff11/12/2017 17:02:44
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231 forum posts
545 photos

The ski are nearly finished. The bottom is covered with 25g/m2 glassfibre. Both together weigh 20g, 12 more than the wheels so that’s fine.

Yesterday everything was covered in snow, but it just lasted for a few hours. Long enough for a visit to the Christmas market, but not for any tests with the Turbulent.

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Piers Bowlan12/12/2017 07:07:10
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1239 forum posts
36 photos

They are very neat Timo (as usual). They will probably work on wet grass too, if not so realistic.

I was offered a pair of skis for my full sized Turbulent many years ago when I was a member of the Tiger Club at Redhill. One of the problems was that when there was a decent snowfall I couldn't get to the airfield but when it began to thaw, it was too thin and slushy, when the skis would quickly freeze onto the snow. Full application of power with the stick fully back and full rudder waggle would break the skis free from the snow and the flight could then commence. So I never did do any Turb on ski flying myself, sadly. sad

Post some pictures of your model flying when you get more snow, it will look very festive.

Timo Starkloff25/12/2017 10:57:30
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231 forum posts
545 photos

I‘ll try to get some pictures, Piers. Unfortunately the ski are finished now but no snow in our region.

Pilot and exhausts still missing, but I finished the cockpit panel and it looks quiet good. Maybe I manage to put a FPV camera in the cockpit, a realistic view is great then.

Merry Christmas everyone!

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Edited By Timo Starkloff on 25/12/2017 10:58:40

Timo Starkloff11/02/2018 15:39:36
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231 forum posts
545 photos

Bad winter for flying with skis - temperatures change every few days or hours, so no nice snow surface and no flight test yet.

But end of February is a indoor model airshow and I'll try to finish the Turbulent concerning pilot and engine. The pilot from foam is once again covered with balsa filler, made fluid with some water.

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Devcon111/02/2018 22:23:11
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1197 forum posts
368 photos

What a beautiful build. It looks great with skis.

One of the prettiest Turbulents I've seen.

Timo Starkloff17/02/2018 23:13:57
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231 forum posts
545 photos

Thanks, I like that nice little plane, too

Tomorrow will be the first test flight with a pilot. Weight of the seat and pilot is 19 grams, nearly as much as the 3S350 accumulator. But no need to worry with center of gravity, since he is sitting almost on the point.

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Timo Starkloff19/02/2018 16:59:40
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231 forum posts
545 photos

With a small M3 screw the pilot is easily detachable, in case of indoor weight saving or placing a FPV camera inside the cockpit. No new inflight pictures yet, but the looks of the Turbulent are much improved by the pilot.

Now only the engine tubes and wires and details around the canopy are missing.

We just have had enough snow for taking some pictures on skis, sadly this snow was mainly in forest area so no chance of flying there.

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