Im a proud owner of two trainer high wing planes where the bottom of the wing is flat. My girlfriend bought me a seagull boomerang for xmas and the bottom of the wing is not flat i just want to know what are the pro's (if any) and con's (if any) of having the bottom of the wing curved this way?

Also are these harder to fly than a seagull arising star?

http://aabt.co.uk/prd338-1189.htm

Sounds like you got a good one as far as the girl friend area is concerned! The trainers with flat bottom wings are generally quite docile and have more of a tendancy to self-correct back to a stable flight attitude. That can certainly be a " pro " when you`re first learning. What you give up ( "con" ) is maneuverability. The Boomerang, however, with it`s semi-symmetrical wing, will give you the ability to experiment a bit more with aerobatics. It will also be somewhat less forgiving than the others, but not tremendously so. Sounds like you`re well set up to begin!

If you can fly your trainers well, you'll really like the way a semi-symmetrical wing flies!

It will go where you point it as opposed to having to fight the self-correcting tendencies of a flat-bottom wing.

thanks for your replys cant wait to get this bird in the sky's :-)

Most planes with flat bottom wings happen to be trainers with designed in self correcting tendencys but I don't believe it is the flat bottom wing that gives them those self correcting tendencys. Dihedral, tail moment, center of mass location has a lot more to do with it. Oh yea, let's not forget wing loading. I'm pretty sure a symetrical wing trainer could be built. Take away the dihedral and move the CG back a little and voila, your flat bottom winged trainer is no longer self correcting.

It's like assuming that cigarette smoking causes crime just because the majority of prison inmates smoke.

Congratulations! You've just graduated to a sport plane. The lack of wing dihedral will take away the "self correcting" tendencies of a trainer. The semi symetrical airfoil and 0 incidence will give you better maneuverability and speed. What does all this mean? Well, instead of doing 1 roll per acre, you now can do like 5. Landings will be a little faster, and your reaction time needs to be a little quicker. I would suggest a 6 channel radio though. You'll soon learn the importance of dual rates. It's almost like unlocking the cheat codes to your favorite game

G'day Mate,
The Boomerang 40 is one of the best trainers going around, they are NOT harder to fly, in fact they are a bit easier, if there is any sort of wind, they penetrate better, without adding heaps of down trim, in wind, & they are great for basic aerobatics, they fly very nicely inverted, I have taught a couple of fellas with them, you will love it.
Just don't balance it nose heavy, stick to the recommended balance point in the instructions & you will be fine.

daz3nt,

I'll just mention that the flat-bottom wing flies best with the flat side down, while the plane with the symmetric wing flies just as good inverted as it does upright. (assuming proper balance.)

I think that is more responsive to your original question.

Best wishes,
Dave Olson