LShaver1

My Feedback: (6)

Working on a Hostetler Bucker Jungmeister (wings done) starting Fuselage , plans show 0 degress incidence on top wing and 1 degress negative incidence on bottom wing, tail is 0 degress and 0 (down) degress in motor; plane also uses a fully symmetrical airfoil.
My goal is a biplane that is acrobatic , should I leave it as is or set top and bottom at 0 and make adjustments to the top wing after flying it ?
Any feedback or thoughts are welcome
Thanks
LShaver1

aerowoof

I woluld leave as is,the top wing should stall first in this setup allowing some snappy manuvers and easier recovery

CrateCruncher

My Feedback: (1)

I'm not familiar with the Hostetler Jungmeister but if it were my plane I'd set it the way the designer recommended at least for the initial flights. Most of the aerobatic bipes I've known over the years were symmetrical set ups like this although the bottom was usually at "0" and top was "-1" (Aeromaster, Super Skybolt, etc). If you plan to dial in the incidence through experimentation just leave the saddle fillets unfinished for the initial flights.

Tony Hallo

You will find that most biplanes have the top wing set with more incidence than the bottom as does this plane.

Rodney

I beg to differ on the normal biplane incidence. Most models perform much better with the upper wing at -1.5 degrees relative to the lower wing. I have built and flown well over a dozen: 7 Airomasters, 2 large Phaetons, 2 40 sized Phaetons, many Moths (both 1/4 scale and smaller), 2 large Lazy Aces, 1 small Lazy Ace and all flew best with the upper wing at -1.5 degrees with respect to the lower wing. They all also like about 3 degrees right thrust and 3 to 5 degrees down thrust. It is amazing how just a degree or two in change of the relative wing incidences change the flying characteristics. Now, do first try what the designer or kit producer recommends . If you do not like the way the plane handles, then a little experimenting might be advisable. You could be pleasantly surprised.

LShaver1

My Feedback: (6)

Thanks for all the info....all the biplane plans I've seen so far have the bottom 0 and - in top, even the real Jungmeister (but it was a flat bottom airfoil), think I'll try 0 and 0 then crank on top wing to see what happens for the trim flights
Thanks
LShaver1