Minimun amp rating of and esc for 2s & CMS7700

[Gee]

I have the mm's (not laying around their in other rcs) I could put in it, but then I would need to try and water cool them also. That's one of the reason the model of esc that I linked to above was appealing to me. They had the water cooling already set up. Has the fwd/rvs brakes, and can handle the 2s lipo. The cheapest one, the 25amp is only 32.00. So blowing up two of them wouldn't be that expensive. If it is a sure fire explosion running the 25amps. I wouldn't get them. If the odds are 50/50 or better that a 35amp esc might not blow up. I might gamble the 84.00 dollars for two of them. Once it starts getting into the 120 dollar range. That's a little different for some reason to me.

The sidewinder didn't come to mind for an esc to use. Two of them would be a bit of money plus the water cooling for them. I did notice last night when I was on the cc looking for amp info. They don't recommend the sidewinder with any of their motor above the 5700. I guess that should of have given me a better clue of what I was getting into.

This was just an idea to throw in the villian, make the long trip to the lake and try it. I rarely get a chance to run it now. If I lived on a lake or was at one alot. There wouldn't even be an issue about what to get for it. The best I could afford.

[tc3_racer_001]

why not try 2x mamba max and 2 batteries and use a y adapter? im not even sure how the steering works on those boats though (whether it decreases one prop or has a rudder)

also i forgot u were using a boat LOL.

but the mamba maxxes shouldnt get too hot inside a boat, perhaps adding a alloy sheet that they stuck to would be a good idea?

[hemiblas]

Ok, I'm going to go out on a limb here and I'm going to say a 120A speed control or above. The 25amp unit will melt. The 7700s pull some serious amps. I generally have to gear way down just to get the mamba to 180 degrees on my offroad vehicles. In my opinion the 7700s are for on road only. At 2S you are looking at 56k rpm about double what a boat would normally pull. I think you are going to smoke some esc with this one. I think the 7700's will work on 3 or 4 nimh cells each. The villain also doesnt have any prop choices so you are stuck with whats on it right now. The only way I think you could get it to work is if you could prop way down. If you can gear it to about half of what the titans normally geared at you may have a chance on this one, but even at that I would recommend an 80A speed control min.

EDIT.
check out the cheap esc thread. They have 100A speed controls for 28 bucks.

EDIT
I'm a big fan of my villain since the last time I took my supervee to the lake the water was to rough to get on the plane.

[lincpimp]

Originally Posted by hemiblas

I'm a big fan of my villain since the last time I took my supervee to the lake the water was to rough to get on the plane.

Buy yourself an octura x642 prop, polish and balance it, and enjoy. Adds about 4-8mph and greatly increase the speed out the hole. Use good lipos though... nimhs will not cut it in this boat. No way nimhs can produce 60+ amps continuous...

[Gee]

Thanks hemiblas. That was a helpful post. I had no idea what the amp draw of the motors would be. For that mater any motors. I opened up the Medusa instruction sheet today and behold they have a table in it with some info concerning the amp draw of their motors. That table gave me some good references to go from also. The highest KV motor 4800 was list as 97a cont. That helped me put things into perspective also. I've seen that table before (RCM store for 1) but didn't understand the abreviations that were used in the header. Even if I don't attempt this with the 7700's I've once again learned somethjing new and useful. Thanks for helping me figure things out RCMers

[hemiblas]

Sweet, Yeah I have thought about a couple of sv27s, 45 amp speed controllers and throwing it all into the villain with a couple of 4S lipos, but it would be extreme overkill. The villain couldnt handle one of those motors, but 2 would just be uncontrollable even at half throttle.