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Druine D.31 Turbulent

Slow- and Parkflyer

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Timo Starkloff17/10/2017 22:03:40
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341 forum posts
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Added cables for wing servos with the help of a bent wire.

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Timo Starkloff21/10/2017 22:49:56
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Today I tarted with servo installation. The carbon tube and the plastic clip are glued together with cyan. A very easy solution.

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Timo Starkloff22/10/2017 09:12:40
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Timo Starkloff24/10/2017 21:40:08
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341 forum posts
759 photos

For applying the foil I use a simple iron. It‘s big and heavy but reliable. I‘ve had too many small model irons which ceased function after a few models.

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Timo Starkloff24/10/2017 21:42:53
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Next task was making the flap linkage from thin glassfibre.

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Timo Starkloff24/10/2017 21:44:16
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341 forum posts
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Timo Starkloff24/10/2017 21:46:56
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Timo Starkloff24/10/2017 21:49:53
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341 forum posts
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Flaps are not scale for the Turbulent, but hopefully efficient.

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Edited By Timo Starkloff on 24/10/2017 21:51:25

McG 696925/10/2017 07:16:51
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2530 forum posts
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Very tidy work as usual, Timo. yes

Cheers

Chris

Piers Bowlan25/10/2017 09:11:31
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Beautiful workmanship Timo and a great build blog. I owned a full sized Turb (G-AWMR) back in the eighties and I never missed not having flaps as the aeroplane had built in drag (!) and a low landing speed. Your flaps look very neat and will be very effective for indoor flying. yes

Timo Starkloff25/10/2017 20:47:48
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341 forum posts
759 photos

Thanks! It‘s good see when things work like planned long before. I‘m already looking forward to add some details like the boxer motor or the nice fuel control. But first it should become airborne.

I found some pictures of your Turbulent, Piers. How was flying with that small plane? Did you also built it? Are you flying radials today? I found your small picture on the website from kitfox.

Timo

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Timo Starkloff25/10/2017 20:55:53
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341 forum posts
759 photos

The spur is made from two layers of plywood, being bend while drying. Seems it’s a fine working suspension.

Timo Starkloff28/10/2017 23:01:31
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341 forum posts
759 photos

Ready for first flight

Just the weather isn’t looking good, rainy and quiet windy. Typical autumn weather.

The weight is now at 415 grams, whith a big 100g 3S1200 accumulator and heavy 37g wheels. Lighter wheels will be made from foam and a 3S500 with 50g should be enough. So I’m at 350g, which was my maximum weight. Seems ok for the first try in building that kind of model from wood.

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Piers Bowlan29/10/2017 07:11:53
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1825 forum posts
44 photos

Timo, I had a lot of adventures and happy memories with my Turbulent. I flew to rallies all over the country and abroad too. It was economical, consuming just two gallons of mogas an hour, which gave it an endurance of about three hours at a leisurely 65kts - the main problem was the cold in an open cockpit! Despite its draggy airframe and low power it was a joy to fly having light and effective controls. Many were tempted to aerobat it, sometimes with tragic consequences, as it was not cleared for aerobatics. I have hung up my flying goggles now sadly. crying

You have built a fine light-weight model which has loads of character. After you have maidened it, perhaps you might consider submitting a plan to Mr Ashby for possible inclusion in RCM&E at some future date? I can think of at least one person who would like to build one!

Timo Starkloff30/10/2017 21:27:03
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341 forum posts
759 photos

Hello Piers, thanks for sharing your experience with the Turbulent. Sounds like really good times! I‘m always interested in aeroplane stories.

I will make a plan for the Turbulent and let you know when I got it finished. I still have work to do on the TK4. The Turbulent is scurely interesting for other builders and pilots. I already was in contact with David Ashby concerning a 1/12 aircombat model, but it got delayed a bit.

Today’s morning the air was calm and due to time change already bright. So I made the first flight before going to work. Good decision, since it was windy and much darker when I got home. During the flight some wind developed, so I could only perform major manouvers. Takeoff went fine, thanks to the big wheels. Controls are great and aerobatics like rolls or loops are easy. Not much power is needed to stay airborne. Flaps are working fine. No tendency to spin, during stall only the nose goes up and down a bit. Landing can be made very smooth. So the airfoil works quiet well for the Turbulent.

Next Saturday is the first indoor flying for our club. I prepared a smaller 3S500 accumulator and have to make lighter wheels. Weight would be at exactly 350g then.

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Edited By Timo Starkloff on 30/10/2017 21:32:07

Edited By Timo Starkloff on 30/10/2017 21:33:25

Timo Starkloff01/11/2017 19:39:42
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341 forum posts
759 photos

I‘m working further on the details. The instrument panel is made from 1mm balsa. The canopy frame is made from 3mm plastic tube, carefully heated with a heat gun.

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Timo Starkloff01/11/2017 19:41:00
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341 forum posts
759 photos

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Timo Starkloff01/11/2017 19:45:04
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341 forum posts
759 photos

The plastic tube installation is reinforced by a thin 1,5mm carbon tube.

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Timo Starkloff01/11/2017 19:55:40
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341 forum posts
759 photos

The thin wire in front of the cockpit is the simple fuel display.

The stripes on the wing are blue, they look darker on the picture.

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Timo Starkloff01/11/2017 20:19:16
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341 forum posts
759 photos

The weather yesterday was sunny with no wind, so I made some more test flights. As a preparation for indoor flying I flew with the 50g lighter 3S450, a 9x3 prop and several different flap positions. I need less power and can fly slower with the lower weight. Using ailerons as additional flaps works, but lead to less manouverability. Flaps work best at around 40 degrees, flying is easy even with more than 60 degrees, but needs much more power. The good thing is, that flying is safe and easy at all flap settings. No dangerous condition occurred, no stall could be provoked. And the minimum speed and tight turn rate should work for indoor flying

Something to read, I finally found a nice article about the Turbulent and her designer Roger Druine:

**LINK**

Edited By Timo Starkloff on 01/11/2017 20:20:22

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