rotccapt

i am taking an old plane from the August 1991 issue of model aviation and re-drawing it in cad since i dont think that plans are availible for it. the plane is an AIRMASTER canard style plane. it has a 66" wing span and will be flown with twin push pull TT 46 pros. while re-drawing it i had the idea to eliminate the single centerline mounted verticle fin and rudder and moving it to the wing tips. would this affect the way it flys? also do you think it would be able to knife edge in this orientation?

here is a pic of my idea and the origonal layout

aerowoof

knife edge flight depends on the lift produce from the fuselage side and where that center of lift is located.as far as the fins on the wing should be ok just remember that they only need to be 1/2 the area of the original not 1/2 the size.

John Sohm

My Feedback: (9)

One point to consider is the effect the propblast has on directional stability. The propblast moves significantly faster than the normal air slipstream from forward movement, which is what the verticals on the wing will experience. I would suggest you make them a bit more than half the area of the single vertical if you want to keep it closer to the original in handling.

An historical case in point is when they cut down the rear deck on the P-51 when they switched to the bubble canopy on the D model from the caged version of the B model. That drop in cross sectional area contributed to the noticeable loss of stability and prompted North American Aircraft to add that little fillet section to the front of the horizontal stabilizer to make up for modification to the fuselage.

aerowoof

you may want to refer to the japanese ww2 fighter shinden that was a pusher canard that had the rudders mounted on the wing.they were mounted above and below.