Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

kelly f1 with YS63


Old 11-09-2008, 06:41 PM
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Default kelly f1 with YS63

i have a kelly 70 with ys 63 ,I had 12X7 on the engine and it does ok. What prop would you all recomend for this combo?
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Old 11-11-2008, 03:14 AM
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Default RE: kelly f1 with YS63

My Kelly is also powered by the ys63 and have settled for a APC 12x7 for now but I have also tried the APC 11x8 and 11x9. The 11x8 is probably the fastest but the rpm went to high for me to be comfortable with a fourstroke but the 11x9 is probably safe. Using 20% nitro and APC 12x7 turning around 10700rpm rich static the plane will pull straight vertical after the take off and onloads in a dive and have good speed.
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