ORIGINAL: artandscience
Maybe I should just stick a .40 in it (I have a .40 FSR lying about).
That .40FSR should do the trick. With a 10x4 prop, it will give you all the pull you need.
Also, with the CG at 1.75", it will be very stable about the pitch axis. Set the elevons to be level with the
bottom of the wing (see below), and it should fly right out of your hand.
HTH.
D