im finishing up a stihl 2.8 in 43cc conversion engine that came out of a saw that was like new compression test was 160#
so i know it will run ok . im not sure what it will weigh but it similar to my friends q 42 in size and weight

so the big question is i want to build an 80 in or bigger magic 3d
ASSUMING its similar in power and weight to a q42 or us 41 does this sound like a reasonable sized plane for this engine?
also if you wanted unlimited vert out of one of those engines what would be a good rtf weight to aim for?

also the only real changes in airframe design im wondering is positioning the rudder further back (one of the 40 sized arf magic shortcomings imo). and swapping the semi symetrical airfoil for naca 0014 for better inverted perfomance ?

thanks for any input or constructive critisism
kevin