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Nov 30, 2019, 04:25 PM
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SilbernerSurfer's Avatar
Originally Posted by FlyingW
Built a Sukhoi Su26-like airplane whose mission is to fly aerobatics slowly and in small spaces.

Constructed entirely of Model Plane Foam the airframe came out to about 13 ounces, 16 ounces all-up with the battery. wingspan is 44 inches.

Initially using a Scorpion 2212-960Kv outrunner, 2s 1300mah lipo and 10x7 APC-SF prop.

A couple of test flights showed that it is aerobatic, but not particularly slow. More testing with different batteries and props might get it to where I want it.
May you calculate the wing area in dm2 please, and tell the exact AUW in gramms?
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Dec 01, 2019, 08:03 AM
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FlyingW's Avatar
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Wing area was 29.2 dm2, AUW was 453 grams.
Dec 01, 2019, 09:37 AM
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Thanks. Thats around 15-16gramms per dm2. Try to get below 10g per dm2.

Maybe a bigger wingspan and longer chord will help.

There is a guy on rcgroups which builds light weight 1500mm Slowly's which are pretty slow for outdoor use. Maybe you will find his postings.

I coped around with slowflyers a bit. Most importent thing is a low wing loading. Second is a undercambered wing and the right angle of attack.
Dec 01, 2019, 09:46 AM
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SilbernerSurfer's Avatar
Your frame looks pretty light weight but stiff, which is a good thing. I guess you will need a lighter batt, bigger wing and the right angle of attac. Try to save weight where ever you can! Maybe a lighter motor, servo, esc too.

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