Thanks for the reply rudderless Ron

On the Sig Akromaster with the .20, I would go with 52' eye to eye and .012" lines. 

  No offense, but,  Yikes!   If you like 3 second laps, maybe. The 20FP on the Acromaster (about the size of many 1/2A stunt planes) will be an absolute *bomb*, CRAZY FAST. Not to mention grotesquely nose-heavy without a ton of ballast.  You can fly a Nobler with decent results with a 20FP - a  full-sized Nobler. 

   Super-short lines are not the way to go. I run .015x60-62's on my Skyray 35/20FP. You may get away with the  .012s if they are kept in good shape but I would not feel comfortable with that. I would suggest .015x60 to begin with, and makre sure to put in enough line sweep and tipweight.

     In any case, I don't think the Acromaster and the 20FP will end up being a happy combination. Might want to reconsider that, and use an older, baffle-piston 15 (as it was designed for), a 15 LA, a 10FP, or something like that.

      Brett

I have a older super tigre.15 i may try on the akromaster?anyone have any input on the ST.15???

   Much more appropriate. It will still be pretty darn fast, but not out of the park crazy overkill. I still think you want more than 52' of line.

   In fact, if you didn't have one, I was going to suggest a trade - I have a ST G20/15 in good shape (about an 8 or 9) that I would be willing to trade for an 20FP ABC in good shape.

   Alternatively, I would suggest that the 20FP would be pretty good for the Banshee, if you keep it light. The Banshee/Veco 19 was the hot setup in WAM A" Stunt  for years, and the 20 has more power than the Veco.

    Brett