supervee 27 fast sucker =)
Hello i have supervee 27. Spec R?? =))
I have the turnigy 180amp esc + leopard 4074 2000kv in it it ran 95kmph with 6cell lipo and x437 prop amp draw was then 126amps+. The stock 150 flex kept braking.
New mods: 187" flex / driveline. new strut.
The flex is now strong enough for much power.
I didnt like the 2000kv setup because x437 is too small prop. Boat little slow on plane and bad acccelereation out of corners. I could use 5cell and bigger prop but i want power and volt*amps = watts and too get same watts at 5 cell i would need 150amps which will give me very bad runtimes. And hot batteries. 100amp draw out of a 5000mah pack gives about 3minutes runtime so.. who wants only half of that and batteries becomes very hot too if you have amps at 150amps. Maybe 150amps will work whit 2 sets if batteries in paralell but that is not possible in a supervee. Well 150amps will work on a single pack too but it will get pretty hot and bad runtime, think these setups is more a dragrace/top speed setup.
any opinions?
from my experience 130amps through a turnigy 45c 4000mah is making the pack pretty hot.
I think max 100amps is more ok for a sport boat racer. (not drag) Then packs wont get hot and runtime is good. Too get the same power at 100amps as a 130amp draw setup you need more volts and you need less kv if you want too be able too swing a bigger prop.
So.. i had a leopard 4074 1400kv laying around it draws about 65amps in a supervee 27 at 6cell lipo and x642 prop.. thats not going too move it thats only 1440watts / 75kmph.. too slow.. only thing too do is bigger prop... but.. tried x645 and it gave the boat unstable chainwalk...
Another friend did a job on a x646/3 he cut it down too 40mm it gave his supervee with same setup 87kmph not bad and no unstability.. But that was a hell of a job making that prop.. the thing is when you cut down a 46mm prop too 40mm you get much more pitch than a stock 40mm.. Maybe i will try too do this prop cutting later on too get a more pitchy 40mm-42mm prop loading the 1400kv 100amps @ 6s...
Anyway:
I knew my supervee was stable at 6cell lipo with the x642 but thats 75kph/31000rpm only, so i thought.. what the heck lets try 7cell lipo on the turnigy marine 180amp esc (2-6cell lipo esc). I disconnectet the esc BEC red wire and used a receiver pack instead. I knew the leopard 4074 1400kv handles 7cell lipo with ease.
At first the esc would not start but i programmed no lipo cutoff voltage. And after that it works on 7cell lipo. I just have too stop before pack go too low in voltage (3volt/cell)
And down too the lake i went. I ran a x442 detounge prop.
Its freaking amazing.
Was a bit choppy so i couldnt give full throttle at any time.
But i tried a fast full accelereting for half a second and the thing was wheeleing like crazy!! insane!
Ran 3sets 7cell 5000mah packs through it no heat in esc/caps batts connectors or motor!
The esc still works! on 7cell!! turnigy 180amp marine 2-6s
Will try it more.. maybe x642 prop also then i should see 100kmph+ according too speed calc No heat means no stress on system.. and the extra battery weight in a supervee is a good thing when speed picks up. The batts are cold in this 1400kv 7s system and was hot on the 2000kv 6s 126amp draw system...
I put the receiver pack on the same side as 3 cell pack then the boat was in balance. (whith the 4cell on the other side.
With the right prop on 7 cell i will pull 100amps 26volts = 2600watts thats just what the leopard 4074 is specified at.. At 100amps i will get decent runtime, and i think 2600watts / 36200rpm will move this boat =)) The leopard 4074 1400kv @ 7 cell lipo in my deltaforce 33 gave amp draw 100amps with same x442 detounge prop. I think the supervee 27 has less drag so i guess x642 detounge should be ok too.
=))
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Originally Posted by Goonboy2
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