x640 or x442 prop

[vvviivvv]

ill just mount some small bullet connectors on the hull / lid to keep it down

[video200]

637 and 640 works like a charm on 8XL in my drifter S on 4S 2P :)

[Brushless55]

I've run my Drifter S with an 8XL / Hydra 240 and a X642 for over a year on 4S 2P
4100 30C Neu batt's. Close [ 59.1 GPS] to 60 MPH. Watch temps after 2-3 minutes. Highly entertaining turns, er, barrel rolls at speed

That's nuts!

[785boats]

vvviivvv.
Here's my 32" cat with an 8XL 4s Lipo & X640 prop. The X642 is a bit quicker with no heat problems.

http://www.youtube.com/watch?v=po3I_GMW47E

Cheers.
Paul.