RE: bubbles in fuel lines
h9 han3011 plug; byron fuels 15% nitro; 18% synthetic castor mix; Master Airscrew GF3 11x7. I don't think it is so hot. I am pretty sure
an OS FX .45 or a Super Tiger .45 will beat it a little bit. And even better a MACs muffler with either of those two engines and a 11X6 prop
and a Sky Raider Mach I gives excellent vertical performance. Two experts at my club, Tucson Radio Control Club, have them and its
unbelievable what they do with what is essentially a trainer.