1st try out of making boat

[gzzuz]

ok here is my story tried to build my boat and everything which was a nightmare finally got it all put together painted blah blah blah and first test run was a total flaw my propeller was composite propeller plastic to me, it lost the fins and the shaft was 1/8'' straight stainless steel which got all bent and the stuffing box unglued from the boat (glued with epoxy) not to mention the aluminum strut broke in half. Im trying to run a 540 (3650) 3200kv brushless electric motor with a 120 amp (160-180 amp burst can't remember) ESC on 2 parallel 6S 3000 mah lipo batts.
My request to any helper would be what propeller should I use for this boat shaft or flex cable or system to use and whats needed.

the length of the boat is about 30" and shaft of motor 1/8''

[Flying Scotsman]

Holy crap that motor on 6S power and an ESC that is not up top the task...descion time for that boat.

Douggie

[video200]

first of all. that is a 2 to 3s motor. your rpm aim should be between 20-25 000rpm unloaded.
that motor is also to small for a 30" hull.

as to your request.
you need a new motor for one. 1/8 flex would probarly not be a bad idea and a new strut.
for prop that all depends on what new motor you put in there.

[eboat]

3200KV X 6S X 4.2V = 80,000RPM I think we have solved the problem

[gzzuz]

well I'm new to rc stuff so I basically have not clue of what I'm doing. the specifications of the motor are.
3200 kv
900watt
and says its and outrunner I did a research read a bunch of stuff about batteries but every site says something different than the others.

[video200]

well that leaves you with 2 options realy.
you can change batteries for 2 or 3s lipos and a small prop or you can get a new motor and use the batteries you have now and get a motor more suited for your boat and a prop that wil push the hull

[Flying Scotsman]

well I'm new to rc stuff so I basically have not clue of what I'm doing. the specifications of the motor are.
3200 kv
900watt
and says its and outrunner I did a research read a bunch of stuff about batteries but every site says something different than the others.

Your motor is not suitable for that hull, you want as a minimum an

Product ID: fei-580-L
Feigao 580L "Long" Sized Brushless Motor

Plus a prop that has been setup by someone like egneg...search this site....Welcome to the FE world.

Douggie

[RIPFENCE]

just a little perspective here..in electric boating you cannot go into it blindly not knowing what you are doing..too many variables that can cause you ass aches!! buy a ready to run rc grade boat from proboat traxxas or aquacraft...before i even attempted to do anything with boats i joined ose and searched the forums for about 3 months..i felt like i knew quite a few members here before i even posted lol!! even after this i blew up several boats!!!

[gzzuz]

yeah I figured it would have been easier to ask and then start messing with the building of a boat I have probably spent over 1000 without results, but I really like to figure out things but honestly this is out of my range of challenges so far, I'm in the middle of it and now gotta finish it I just want it to go as fast as the traxxas titan boat that's it thats why i went and got 6S lipos but like I said I know nothing about this stuff well now with the flaws and all that Im learning at least.

Ill try to get the right set up hopefully this time at lest it can run up to 10mph

[Diesel6401]

yeah I figured it would have been easier to ask and then start messing with the building of a boat I have probably spent over 1000 without results, but I really like to figure out things but honestly this is out of my range of challenges so far, I'm in the middle of it and now gotta finish it I just want it to go as fast as the traxxas titan boat that's it thats why i went and got 6S lipos but like I said I know nothing about this stuff well now with the flaws and all that Im learning at least.

Ill try to get the right set up hopefully this time at lest it can run up to 10mph

It not just about 6s lipo to go fast. Their are many people running faster then the titan on less voltage. It's all in the setup. You need to target your RPM range (25-30k) is a good place to start. To get your rpm you take the motor kv rating and multiply voltage in your case 3200 x 22.2 (6s), to get a rough estimate of unloaded, then you need to setup the proper drive line to handle the proper voltage. For a 30" hull I would target around 1400kv-1800kv for a motor and the proper size. Next the proper flex cable. 1/8 is way to small for a hull that size.

At the rpm you spun the motor maybe damaged. Best bet is to start over. If you havent fried the esc running 6s (i would assume you left the esc bec on which is not good at that voltage) save it and start from the beginning if you want to give this a try. I would suggest getting a RTR first though to learn the basics. I will suggest the following setup for you though.

Leopard 4074 1774kv on 4s using the esc that you have if not fried.
Leopard 4074 1400kv on 6s dis-ableing the bec on you esc
Leopard 4082 1500kv " "
CC1518 1800kv

.187 3/16 flexcable
Speedmaster strut

[Fluid]

Jesus, where in Texas do you live? There are several groups of FE boaters in the Lone Star state who can give you a lot of hands-on help if you are close enough. The most active, knowledgeable groups are in the Houston and Dallas areas.


.

[highndry]

Take a few hours and research this forum. Will save you many $$ and even more frustration. Further, as Fluid advised, join a group.

[gzzuz]

ok well than you all guys for the advices I'm getting. the ESC operates 2-6 cells lipo the BEC is 6v 3A and I was mistaken is a 120 amp continuos 240 burst, the motor I think will be replaced still works but makes a weird noise when rotating I must have gotten water in it from the flood.

I live in Greenville TX close to Dallas.

[Make-a-Wake]

I would suggest the Leopard 4074 that Diesel posted as well.................the 1774kv on 4s would be great.......maybe even the 2000kv. I run a 4074 Leopard 2200kv on 4s in my 32" Pursuit and i'm in the high 40's.............

Your motor kv is too high for more than 3s and your driveline is too small...........

[jimbo--jones]

Gzzuz! Id get the hell out of this hobby right now before its too late. Run while you still have a chance! Youl get addicted and its gonna steal all your money.

Haha nah its good fun. Good on you for jumping right in. I did the same and blew up 400 dollars worth of gear. I had 2 mins of run time and everything blew up. The speeds i got, got me hooked and I thought id come visit this place to find out how to do it properly. Its a big learning curve.


Take a look at these threads, these helped me figure it a bit better.
http://forums.offshoreelectrics.com/...read.php?t=271
http://forums.offshoreelectrics.com/...ead.php?t=4159