RE: Fuel mixing advice
I did some more testing on my homebrew FAI 80/20, 1 drop armorall in my SuperTigre S90K. (all rpm figures are peaked or 1 click rich - no difference in rpm across 4 clicks at peak)
APC 13x6 = 11,400rpm
Master Airscrew K-series 12x8 = 11,280rpm
APC 13x7 = 10,890rpm
APC 13x8 = 10,290rpm
The last time I ran 5% nitro on that same APC 13x6, it turned it at 12,000rpm flat.
I think I'll add maybe 2% acetone and see if that improves the idle and stransition a little. It wasnt backflip starting as well on my FAI as it did on 5% nitro.
As per the ST instructions, I opened both needles way rich and set the high speed mixture to peak, then set the idle mixture for as clean a transition as I could muster. The spraybar is set about 1/2 way between straight in and the engine mount lug. I could probably adjust that a little bit more to clean up the slightly rich midrange. I think for now I'm gonna run it on the 13x6 and get more fuel through it.