Guys,

Everything is said on my sight. B matthews, yes there will be a 50 gram electric motor (battery also installed forward of CG, estimated total weight of plane 500 grams) installed up front on te glider- and yes the horizontal tail area was detemrined according to the tail volume coefficient- as I said it is 0.3.The horizontal tail aspect ratio is 4.6, while the wing aspect ratio is 7.201- whic makes the tail aspect ratio 3/5 of the wing spect ratio. The horizontal tail area is 0.2156 ft^2 and it is an all moving horizontal tail, and the wing area is 2.719 ft^2. What I am asking is that not too small of an elevator area (which is the horinzontal tail fin area because it is an all moving tail) for a plane with a wingspan of 4.425 ft and a length of about 2.9 feet (sinject to change) with a tail arm of 2.333 ft?

I am asking this not because I guessed the size for the horizontal fin, I did a lot of calculations for it, but because there is one formula that I ahve never used before which is suposed to tell me the required elevator deflection at any lcoation of the CG along the wingchord- which tells me that elevator deflections required are greater than 80 degrees except for one location where the CG if 15% back from the wing quarter chord; at this lcoation the required deflections range between 35 and -30 degrees. Now, there is no problem in locating the CG there, except for that a week ago a friend of mine told me that for a NACA 2312 I am using the max rearward CG possible is 10% back from the wing quarter chord. So, this is just theory and should I ignore it and just lcoate the CG at 15% back?] Will that be OK to fly?

Sincerely,

Daniel.