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?

Wing area was 29.2 dm2, AUW was 453 grams.

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.

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.