kb 45xl speed controler

[skidooguymxz550]

i have finally got my dads challenger running reliably on a 14xl on 20 cells with a hydra 120. the problem is this setup is to much power for the hull. she goes great in smooth water but after a few laps are made and she runs in her own wake it chine walks like crazy. we choose the deep vee for it's rought water capabilities and she's running like a hydro

what we want to do is go to a 39" fountain or a 43" challenger. will the kb45xl be within the limits of our speedo? will this setup still power us into the mid to high 30's? will 8-12" make a difference in her rough water capabilitY?

thanks

[ReddyWatts]

If your motor is a KB45, are you sure it is a 14XL or is it a Feigao?

[Steven Vaccaro]

i have finally got my dads challenger running reliably on a 14xl on 20 cells with a hydra 120. the problem is this setup is to much power for the hull. she goes great in smooth water but after a few laps are made and she runs in her own wake it chine walks like crazy. we choose the deep vee for it's rought water capabilities and she's running like a hydro

what we want to do is go to a 39" fountain or a 43" challenger. will the kb45xl be within the limits of our speedo? will this setup still power us into the mid to high 30's? will 8-12" make a difference in her rough water capabilitY?

thanks

Most all the boats in that Challenger size range will run well in 2-4" chop at around 25-30mph. Once the wind picks up and the waves get larger, all has changed.

The 45kb will be in the 70-100 amp range. I would feel more comfortable running a higher amp esc.

[skidooguymxz550]

If your motor is a KB45, are you sure it is a 14XL or is it a Feigao?

sorry. i should have been more clear, it's a fieago but with a bigger hull we'd go to the bigger motor

[ReddyWatts]

A KB45/9XL on 18 cells using a Hydra 120 with a X642 prop should use 90 amps and run about 35-40 mph at 25000 rpm for a large hull..

An X640 prop will use 80 amps at close to the same speed, but not sure how well it will get that size of boat on plane.

[skidooguymxz550]

so it sounds like i'm good to go?
could i do a 11xl on the 20 cells? do to my chargers i can only have up to 8cell packs so what i use right now is two 7 cells and one six cell

[ReddyWatts]

Fiegao or KB45? I would recommend a KB45 10XL if you are using 20 cells, 75 amps on a X642 at 24000 rpm, same speed. The Fiegao is too small for a 34 -45" hull, without a trans.

[skidooguymxz550]

why am i so retarded today?

i meant the 11turn kb45

[ReddyWatts]

I think Steven only sells a 12,10,9 and 8xl in the KB45?

[ReddyWatts]

Ha I have my moments too. The 11XL is for a higher voltage setup, but I will look at it for you.

[ReddyWatts]

11XL 60 amps, 30 - 35 mph at 21000 rpm using a X642 prop.
70 amps on a X645 at 23000 rpm at 32-38 mph.

I still like the KB45 10XL if you are using 20 cells, 80 amps on a X642 at 24000 rpm, running 1800 watts.

If you wanted to really push the 10XL over 40, a X645 prop using 100 amps at 23000 rpm 2300 watts. Just need to really watch your temps and raise the strut if running a cat.

[SJFE]

11XL 60 amps, 30 - 35 mph at 21000 rpm using a X642 prop.
70 amps on a X645 at 23000 rpm at 32-38 mph.

How many volts is that on Mr Watts?

[ReddyWatts]

20 NiMH cells for 24 volts.

10XL on 6s Lipo's is 70 amps on a X640 for 40mph at 25000 rpm, if all of these new numbers are correct in FeCalc.? Need someone to test them. They should be in the ball park.

[skidooguymxz550]

thanks for all the help man. i think i have an idea of what to do now