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1) He found peak at WOT and backed off some (as you do when you first run up a new engine)
2) He started to lean his low speed while testing idle and transition (similar to what you and your helper were doing) until both were satisfactory
3) Flew the model but was frustrated with the sagging when on uplines or hovering.
4) To counter the sagging, he richened the main needle to over 6 turns out (he tuned it while vertical).
5) He then got frustrated with the very rich setting at anything other than vertical
6) In an act of desperation he turned the low speed 1/4 turn leaner and noticed that it richened the mixture at WOT, so he wound the main needle in one turn to compensate.
7) Repeat (6) a few times, such that the rpm peaked while vertical at about 2-3 turns of main needle rather than 6 turns,
8) THe engine is now stronger (500-600rpm more at peak), throttles perfectly and draws its fuel well (in other words; runs only slightly leaner when vertical than when horizontal).

He reproduced this sequence at will, just with the low speed setting. I would not have believed it myself had I not seen him do it. te][/quote]
Harry I read this several times. First the GMS47 is not the best choice for 3D (made for speed) This all boils down to the LS needle wasn't right to begin with and the HS was turned to compensate. The key is at vertical the pressure in the tank and length the fuel had to travel wasn't quite enough to force enough fuel to engine at it's needle settings , Hense the opening of the HS needle to get every drop of fuel forced into engine. Sounds like when you got LOW SPEED needle closer ,your HS setting got more normal ,plus you say you gained 500 RPM whitch tells me your needle settings were out of whack. Harry I thought you were an OS 50 GUY