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Author Topic: Foam Davis DA2  (Read 1250 times)
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korale
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« on: October 23, 2017, 07:12:39 AM »

Been a little busy and have not been on the forum lately.

Been working on this for the past couple of months, its made with sanded down foam sheet (looks and feels like Depron but is not called that).
It was supposed to be a Peanut but I got the scaling wrong and its 13 1/2 inches in span.
I'm hoping to fly it in the club scale day.

weight it 12g as is , I'll have to add some nose weight to get the CG right.
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Foam Davis DA2
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korale
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« Reply #1 on: May 08, 2018, 08:02:55 AM »

After a couple of months away from models, I got the chance to do some flying, last week. Tried to get DA-2 Trimmed. It flies OK under power but dives once the turns are off. It's hopeful but not dialed in.

Curiously I could only get it to turn by using adjusting thrust line, because of the V-tail trying to induce a turn would cause a pitch change, I tried aileron deflection and a Gurney flap, it banked but continued in a straight line.

https://www.youtube.com/watch?v=reQQzx1TB7A&feature=youtu.be
 
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Crabby
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« Reply #2 on: May 08, 2018, 08:53:07 AM »

Hi Korale, good to see you back. One thing that’s minor and may not be a problem is the knot location. See what happens when you try to get the rubber knot close to the CG. Plus it could be the effect of the hook sliding forward once the rubber is slack. Other than that it’s pretty rock stable. You are right to use thrust for your turn IMHO.
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« Reply #3 on: September 17, 2018, 12:04:41 AM »

Been a little busy and have not been on the forum lately.

Been working on this for the past couple of months, its made with sanded down foam sheet (looks and feels like Depron but is not called that).
It was supposed to be a Peanut but I got the scaling wrong and its 13 1/2 inches in span.
I'm hoping to fly it in the club scale day.

weight it 12g as is , I'll have to add some nose weight to get the CG right.

I owned a DA2 for about a decade and this is really cool to see.
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Rudder flutter
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« Reply #4 on: September 17, 2018, 04:32:00 AM »

After a couple of months away from models, I got the chance to do some flying, last week. Tried to get DA-2 Trimmed. It flies OK under power but dives once the turns are off. It's hopeful but not dialed in.

Curiously I could only get it to turn by using adjusting thrust line, because of the V-tail trying to induce a turn would cause a pitch change, I tried aileron deflection and a Gurney flap, it banked but continued in a straight line.

https://www.youtube.com/watch?v=reQQzx1TB7A&feature=youtu.be
 
Hi Korale. Wow, that's a lovely little model, she flies quite nicely too. Looking at your video, to my eye she looks a tiny bit under elevated, which also usually means the balance point is a little rearward. Try bending both elevators up very slightly, and increase the nose weight. This will raise the nose a little in normal flight, so you may need a tiny bit of down thrust. A better solution is the raise the leading edge of the wing slightly, but that may be tricky.
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Richard Crossley
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« Reply #5 on: July 21, 2019, 03:31:16 PM »

Been a little busy and have not been on the forum lately.

Been working on this for the past couple of months, its made with sanded down foam sheet (looks and feels like Depron but is not called that).
It was supposed to be a Peanut but I got the scaling wrong and its 13 1/2 inches in span.
I'm hoping to fly it in the club scale day.

weight it 12g as is , I'll have to add some nose weight to get the CG right.
I did a DA2 peanut long ago. This was such a blast to see!
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