Need some "BATTERY" and "ESC" Info

[Bill]

Hey Guys,
I made the jump from gas to electric. I ordered a Mystic 72" Carbon Fiber hull from MHZ along with all the hardware and two of the new Scorpion 535 motors special made for boats with cooling capacity built in and larger bearings and shaft sizes. Now, the only thing that I know about electricity is that, when you receive it in large enough doses, you will hurt yourself or someone who is nearest you. Really, now that I have spent this much, I figured, it's not time to scemp now. What I want is for the boat to run as fast as it can, upright, run as long as I can run it, without getting arm fatique and be as dependable as I can make it, all in one ball. So, seriously, can anyone out there tell me which battery back I need and how many and what ESC would be the best to get.

Thanks Guys,

Will

[siberianhusky]

I'm no help with the big high voltage setups, but the guys who do know will need to know the KV of the motors you bought, this will determine what voltage packs you need for your boat.
Cheers and enjoy

[ManuelW]

Hello Will,

mhh you may want a bit too much:
-run as fast as possible
-run as long as possible
-run it as reliable as possible

May I ask what speeds you expect? I'd run these motors probably on 10S1P 5000mAh with at least 40C each and for the ESC a Swordfish 240A. These motors also work with 12S each but then the 240A Swordfish is very close to its limits as far as I've seen from others. Personally I'm more in favour of LMT motors and Schulze ESC's.

Best regards,
Manuel

[Boaterguy]

Fightercat ESC's
he has a 12S 300A coming out.

[Old Sloppy]

That combo will use Octura x457 counter rotating props if the shaft diameter is 3/16".
I do not know exactly what diameter propshaft MHZ utilizes.
those motors are 10s rated,
so purchase #6 40c 5s Lipo batteries.
arrange the cells so you have 10s 3p, .
You will need 2 ESC's, I prefer 40-160 Schulz.

[Old Sloppy]

the only thing that I know about electricity is that, when you receive it in large enough doses, you will hurt yourself or someone who is nearest you.

Will

This is just not true.......but it is funny.....

Harry

[BHChieftain]

Hello Will,

mhh you may want a bit too much:
-run as fast as possible
-run as long as possible
-run it as reliable as possible

May I ask what speeds you expect? I'd run these motors probably on 10S1P 5000mAh with at least 40C each and for the ESC a Swordfish 240A. These motors also work with 12S each but then the 240A Swordfish is very close to its limits as far as I've seen from others. Personally I'm more in favour of LMT motors and Schulze ESC's.

Best regards,
Manuel

Somebody on this forum has a tag line in their signature that says "cheap/fast/reliable-- pick 2 out of 3" I forget who it is but it is brilliant.

Chief

[Bill]

What makes one sub C LiPo better than another Sub C LiPo? Is there a proper way to store LiPo batteries, say for the off season? I haven't got the motors in my hands yet, but all the information given in the catalog is "Scorpion HK-5035/760" (2136/W) with 760Upm per volt. Magnetic Poles 8, Maximum Continuous Power 5800 Watts, Maximum Continuous Current 150 Amps.
When everything is said and done with getting the boat trimmed out correctly, finding the correct prop, etc. I would like to see 80 to 90 MPH Max. By the way, I'm starting with tuned Octuro X457 props and going from there. Does anyone think that you can build a better battery pack than you can buy?

[Bill]

I will require two ESC's right? One for each motor. If so, will each ESC need to be rated for 1/2 the total or will each ESC still need to be rated for the total limit?

[Bill]

Who has the fightercat ESC's?

Will

[Boaterguy]

http://fightercatracing.com/index.php?page=shop.browse&category_id=10&option=com_virtuemart&Itemid=1

there is a twin one on the page, but I don't think it will cut it, so you will need two ESC's.
the 12S 200A ones will probably do.
RPM/volt is the KV, it is how many RPM's you will get with each volt, this is an unloaded rating. your motor is 760kv according to the catalog.

[LarrysDrifter]

Bill, the very best thing you can do is build a smaller boat with less voltage and perhaps a single drive to get familiar with fast electric. This would be the safest and least expensive way too learn. I realize your no stranger to rc boating, but FE is a completely different world. It makes no sense to jump into a large hull with high voltage not having experience with FE.