proboat 1/8 scale. need someones opinion!

[dreamland s4]

howdy people of ose,

ok im just going to get to the point.

i have a 1/8 scale hydro from proboat which im converting to electric.

the motor i have is

leopard
max amps: 78a
lipo cell: 5-10s
max power: 5500w
kv(rpm/volt:1000kv
resistance: 0.0073
non-load current (7.4v): 3A

heres the link just in case http://www.hobbypartz.com/77p-lbp5692-4d-1000kv.html

the esc i have is turnigy monster 2000 200amp.

my question is, what batteries would one choose for this setup?

-chris

[sailr]

At 1000KV, I'd go with 10S but watch the temps. That may be on the top edge for that motor even though it says you can use it with 10S.

[AlanN]

1000Kv is pretty high for 10S. No load 30,000rpm. Don't know anything about the leopards to be able to advise.

[dreamland s4]

At 1000KV, I'd go with 10S but watch the temps. That may be on the top edge for that motor even though it says you can use it with 10S.

so basically i should get 2 5cell 5000mah 20? 30? or 40c? (does it matter what c-rating i get?) lol yess, im new! thanks btw!

[Alexgar]

the highest c rating you can afford

[dreamland s4]

1000Kv is pretty high for 10S. No load 30,000rpm. Don't know anything about the leopards to be able to advise.

eeek! dont scare me!

yea man i get what u mean, i dont know much about leopards however ose sells that brand so i assume they arnt that bad! the motor was free! looks awesome too

[sailr]

You'll need four 5S 5000's. Two in parallel for 10000mAh and then series for 37V.

10S = 37V x 1000KV = 37,000rpm

8S = 29.6V x 1000KV = 29,600rpm

Remember, that is NO LOAD 30K. You'll never hit 30K under a load. I still say 10S

[Make-a-Wake]

You'll need four 5S 5000's. Two in parallel for 10000mAh and then series for 37V.

10S = 37V x 1000KV = 37,000rpm

8S = 29.6V x 1000KV = 29,600rpm

Remember, that is NO LOAD 30K. You'll never hit 30K under a load. I still say 10S

Are you figuring the 37v by taking a voltage "dip" into consideration.......... 4.2v x 10s = 42,000 rpms. I dont think a lipo dips all the way to 3.7v which is complete depletion when resting................would it...........??

[dreamland s4]

ok, which one of you guys are right? you both sound correct

[dreamland s4]

the highest c rating you can afford

so i can get any c rating i want? i understand c rating wouldn't cause any damage regardless the rating? is that correct???

[Alexgar]

higher supplies more voltage under load increasing the life of your componets

[dreamland s4]

higher supplies more voltage under load increasing the life of your componets

no wayy really? so why do some people have expensive components yet run 20c lipos? well in that case im getting 40c. man, im totally clueless about this stuff. i have to study about lipos.

[Make-a-Wake]

Always get the highest "C" rating you can afford...................

[sailr]

Lipos only stay at 4.2V for about 15 seconds then go down to 3.7V and stay there until they hit cutoff. Why do you think they call a 3S pack 11.1V instead of 12.6V? Hmmmm?

Are you figuring the 37v by taking a voltage "dip" into consideration.......... 4.2v x 10s = 42,000 rpms. I dont think a lipo dips all the way to 3.7v which is complete depletion when resting................would it...........??

[Alexgar]

what are you considering expensive eletronics? probably ok to have a blackjack or sv27 on 20c lipos but when your talking about pushing a boats to it limits the weakest link is usaully evident when u look at price