Setup for Whiplash GV or Backlash

[Fluid]

Jim, your amps are not that bad - my P Mono averages 180-190 all the time, but the temp is getting up there. Either loosening up the hull or a bit smaller on the prop will get you there. Actually, race water may be all you need. It is normal for amps to rise and rpm to fall in the turns on any FE boat, even my 4S rigger does that.



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[Brushless55]

Forgotten about this thread..
but love it because I have a Backlash down stairs in my over flow hobby room that I have thought about making FE

[oscarel]

Hey Jim, how far down is your strut?

[electric]

Jim, your amps are not that bad - my P Mono averages 180-190 all the time, but the temp is getting up there. Either loosening up the hull or a bit smaller on the prop will get you there. Actually, race water may be all you need. It is normal for amps to rise and rpm to fall in the turns on any FE boat, even my 4S rigger does that.



.

Jay, two interesting things to me. One is I went from a propworks 6719/3 blade 554 which has 5.54 inches of pitch to a ABC3016/ 2 blade and 4.8 inches of pitch(but a much bigger diameter) and I still have the equivalent top end speed, 74mph. These are two radically different props to say the least and yet they yielded the same top end? Interesting. I can only surmise that I can unload the motor a bit more, reduce the amps a bit, since I have yet to see the top end decline. I am going try some ABC props 2716/2 blade 4.32 pitch (smaller diameter prop, less pitch), and also I think I got a 2518/2 with 4.5 inches a pitch to try out.

The second thing that I find interesting is I see the heat climbing on my Castle HV ESC yet the amp pull is within the specifications of the ESC? I do know the general rule of thumb is to stay well below the max amp reading, but I do seem to be moving within the range of the esc yet there is a steady heat build up on the esc? The math tells me what you are saying Jay, I "think" I could get my six laps in as I went .88 miles and had only used 50% of my batteries. We will see how these new props work out.

[electric]

Hey Jim, how far down is your strut?

I will check it Oscar. Hey, are running 4000mah batteries for a total of 8000mah at 2p, or are you running more mah's?

[oscarel]

I will check it Oscar. Hey, are running 4000mah batteries for a total of 8000mah at 2p, or are you running more mah's?

I'm running 7250 and never less than 30% left. That's normally 8 laps.

Sent from my SAMSUNG-SGH-I747 using Tapatalk

[Brushless55]

I'm running 7250 and never less than 30% left. That's normally 8 laps.

Sent from my SAMSUNG-SGH-I747 using Tapatalk

This is good to know..

[electric]

This is good to know..

Yep, I was thinking the same exact thing. Oscar is running a backlash also, and will be racing me in just three weeks or so. Shows what a good guy he is for sharing his information freely. I am sharing the work I do on this boat for the same reason. I get the benefits of those who have knowledge on this topic and also help those who might want to do the same thing. There is very little information on setting up these "bigger" FE boats so every bit helps.

[oscarel]

No secrets here .

[Brushless55]

do this and let me know how it goes ...
set strut at 3/4" with 1/2* prop up in the back ....
and cg at 27" from back of boat

[electric]

No secrets here .

Great, can I borrow your prop for the race? Kidding...

[electric]

do this and let me know how it goes ...
set strut at 3/4" with 1/2* prop up in the back ....
and cg at 27" from back of boat

hmmm... I will have to see where I am on the settings. I just don't have much time to look at the boat during the work week...

[oscarel]

Great, can I borrow your prop for the race? Kidding...

I said no secrets, I'll TELL you which prop I'm running!

[electric]

Don't you just love "waiting" for props to arrive to do the next round of testing......

[oscarel]

do this and let me know how it goes ...
set strut at 3/4" with 1/2* prop up in the back ....
and cg at 27" from back of boat

I'll give it a try next time I go testing. I reset mine at Voodoo since there were 30mph winds and didn't set it back.