Conversion

[Dazza]

Hi all, just about to start gutting my thunder tiger outlaw 7.5 nitro boat for an electric fit out..
42" deep V fibreglass hull
I've order for the conversion....
Leapard 4074 1400kv/3y with cooling jacket to suit
Seaking 180a V2 esc
I'm thinking....
2x22.2V 6s 5000mah run in Parrallel for extended run time
Octura x445

Your thoughts? GO....

[Mulisha]

4074 1400kv on 6s a bit on the small side?

[gsbuickman]

I kind of agree with Mulitia. 6s on 1400kv is no slouch, but the Octura 445 is a bit small for the 42'' mono. Conversions are fun though :-) , their all about trial & error to find out what the boat likes.....

[HTVboats]

I run a Castle 1520/1600kv on 6S in a 39" DF and use an M445. With a 4074 you will get better run time but I think a 4082 would be a better choice. 1250kv will allow more prop diameter but you may be surprised how well an M445 or M545 will hookup. X series use more milleamps and are not really faster.
Mic

[martin]

Also look at the 4092 in a 42" hull, the 4074 is on the small side.

[Dazza]

Thanks for the feedback!
Yeah I was thinking it might've been too small of a motor....
I was working on 80kph for 4 minutes at 30,000rpm is that about right??
Can anyone suggest a prop that would be much better suited??

[gsbuickman]

Well from what i gather Dazza, is the safety range you want to stay under is 37,00 rpm as your safety net. Motor KV x voltage = RPM. The higher the battery voltage input, the lower the motor kv you need to stay within your safety net. Atleast that's my understanding of it. remember, at to high an rpm level, resonate harmonics will rip any hull apart......

With twin 5000 mah 6s in parallel, you should get better than 4 minutes run time. I run my mean machine for 4-5 minutes, then i bring it in for a cell voltage check. Then i adjust accordingly for a final run on the packs. I try not to run my packs into lipo cutoff....