octura X props

[Tony]

Could someone please tell me which is better, X642 or X645 prop. I am using an X642 for my bj26. I have another cat that is 36" long, and need to know which prop would be good for this cata. Thanks in advance!

[G Doggett]

A bit more info would help.
What motor, ESC and batteries are you using ?
Graham.

[Tony]

2618kv brushless motor, 50amp water cooled ESC, 3s 11.1v lipo batt.

[G Doggett]

In my opinion even the X642 will be too much for your 50 amp ESC.
A 36 inch cat will be harder to push than your BJ or a DV.
The 2618 kv motor will be trying to spin at 29059 rpm on 11.1 volts but your ESC is limiting you to 440 watts which is not really enough to push a boat of this size at any speed.
( 50 amps X 80% X 11.1 volts = 444 watts )
Get a higher rated ESC.
Graham.:rockon2:

[Tony]

The 36"hull is lighter compare to the bj26. However, which ESC amp rating should i get?