Need a little advice (speed controllers)

[fbass4u]

Hello members I have a question regard a build I am doing, I have a 53" crc mystic cat that I have and I already have my motors that are castle 2028"s as this will be a twin. I talk with a castle tech yesterday about the possible speed controllers and he sugested a hydra ice 200hv, my question is I have been reading through the forums and I understand the 2028 to draw over the 200 amp mark, will this be enough to be able to run my motors or do I need to look into bigger speed controllers? if so what sugestions would be advised? thanks for any help

[RaceMechaniX]

It highly depends on how many cells you want to run and what your speed and run time expectations are. If you stay with 8S I would recommend the lower voltage Ice 240 which works reliably unless you severely over prop. On 10S, you easily have the ability to pull more than 200A and at that point I would recommend a better ESC. The ICE 200HV is decent, but does not have much margin for abuse. Sustained current draw over the rated value will cause severe overheating and we all know what happens next.

possibilities are: MGM 25063 or 40063, Swordfish 300A pro or Schulze 40.30XWK.

The twin will pull less amperage than a single, but you should still expect to have some buffer in there for current capacity.

[fbass4u]

From what I have read 8-10s is what it looks like people are running, this is my first fe so speed wise I am not sure what to expect. I would be happy with anything over 70, not sure what it will take to get there. I looked at the sf 300 but from what I have read I have mixed feelings, so I thought I try to stick with castle for there warranty support.

[Fluid]

Amp draw is dependent on load, which on a big twin is mostly about prop size. It is entirely possible to prop the boat to pull ~100 amps from each motor, which on 10S means around 7400 watts. That is probably enough to give very decent speed in such a large hull. I know that my 41" cat averaged 130 amps on 10S (~4500 watts) when running in the low/mid 60s. If you want 70+ mph stick with 10S on the 2028s, it reduces amp draw if you watch your logging data. On 10S you'll need around 3.9" of pitch, while on 8S you'll need around 4.9". The latter requires some pretty big props which can make launches "exciting". Tyler and I watched this happen a lot last month....



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