i tried the 15 6.. it was not as torky as the apc 16 4 spinning at 8400. it works, but for 3d stuff i like the 16 4. while i always could use more power, i do have to say that the saito 100 fits it very well. with the firewall engine thrust from the plans, this motor and prop combo is pretty much dead on for verticle. so that's nice.

for lateral balance with the saito 100 i found i needed 10 pennys in the left wing.