Is there any gain to cutting down a carbon filled prop ?

[high-tech]

Hello, I'm kinda new to rc boating and having a great time
I'm wanting a bit more out of a x432 surface drive 18 1/2" ski vee running a 35 turn 380 brushed motor 3s 1600 15c

I have done a little reading about the x4 cutting and bending... Since you cant do any reshaping to speak of does it do any good to remove any material without being able to reshape and cup the trailing edge as well as relieve the leading edge?

Thank you for any help

[danielplace1962]

If I understand what your asking. ??

Since you can't change anything else about the prop it isn't likely to give you more of anything except less load and more RPM but if your pulling it whole with no issues cutting it down is almost surely going to give you less speed.

Depends on more of what you want. More rpm you will get for sure. More speed very doubtful.

[tlandauer]

The x series props are metal props and your title says a carbon-filled prop, perhaps if the OP can clarify the actual prop, someone maybe able to help more with the question.

[NativePaul]

^^^^^^^

Also if the boat is easy enough to drive you can gain speed by cutting a prop down, I have seen it several times, but I have also seen the opposite being the case several times.

You always gain RPM when cutting props down, and the pitch of the prop stays the same, so you do have more pitch speed. With increased pitch speed you have the potential for more boat speed, if your boat is light runs dry and has a motor being pushed to its limits there is a good chance of it gaining enough RPM to overcome the extra prop slip the smaller prop will have and you will speed up, conversely if you have a big, heavy, wet running boat with a motor running well within its limits it is likely that the extra slip you get from the smaller prop will be greater than the extra RPM you get and you will slow down.

[785boats]

I would be inclined to back cut the prop & leave the diameter as it is.
This gives two effects. It takes some load off the prop at high rpm & allows the motor to spin faster while leaving the diameter & tip pitch the same. This usually results in more speed with lower amps.
It also narrows the thrust cone, directing the water more rear ward.
If the type of prop you have has a pronounced tongue on it, removing most of that would help greatly too. Again, by unloading the motor & increasing revs.

[high-tech]

Well now I guess it really doesn't matter I pushed it to far and roasted the motor and esc this afternoon so I'm gonna go brushless and that will change everything and I will have plenty of rpms now but thanks for all the input