Yep trade for the x442, reducing the diameter of the x447 only reduces the diameter it dosnt change the pitch as your not changing the angle of the blades.
I think a 442 is too small for your set up. I would try a m445 or m545 but I was running around 30k rpm and your at 40k which is at the edge of safe for a sport runner.
white geico w/2200kv 3674 leopard 53.5mph 4s2p, geico w/ 1800kv outrunner 52mph on 4s2p, genesis w/2200kv castle 53.8 on 4s2p, impulse 31 w/2200kv castle, stock p1 and ul-1
Detounging will help with 'all out' speed. The tounge is at a lower pitch for more bite on take off.
What size motor do you have in her? I run M447's on my pursuit with a 4074 2200kv on 4s. I have run it on light 5s' but should go to a M445 then.
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