Best motor for speed

[conman13]

ok I am a newb to RC boats. I bought a Deep Vee 26'' boat hull from R2Hobbies (http://www.r2hobbies.com/rc-boats/ar...cing-boat.html) I got it today an hooked up the rudder and drive shaft. what I want to know is what motor I can install to make the boat go as fast as it can. I am using this ESC- (http://hobbyking.com/hobbyking/store...arehouse_.html). I was looking at this motor but I have no idea what the differences are between motors. right know I am just going by price. http://hobbyking.com/hobbyking/store...arehouse_.html




-Connor McGrath

[Fluid]

Welcome to OSE! You should choose a water cooled ESC, the one in the link is not and is likely to overheat inside a sealed boat. The motor is suitable for 4S voltage, a good choice for a boat this size if you want high speed. Realize these are budget parts, they may work fine but maximum performance is better with higher quality parts. But as a starter boat they will go as fast as the hull can handle.


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[conman13]

ok thanks I will look into the ESC. I don't know if its possible to tell with the info I provided but what speed would you say the boat would max out at? also the website says that the motor can handle a 5s.

[tlandauer]

For your info. I posted this to answer the other guy, this was not long ago:
http://forums.offshoreelectrics.com/...ght=Impulse+26

[iop65]

it's a 3974 can and only a 1200watt motor??
you get that power from a 2860 size motor!!
i don't think you can put in such a heavy /big motor in that hull : it's only 26"" and has a flood chamber ( limits the room inside)

that motor will sink your boat :-)

i suggest a 2860 or perhaps a 3660 size
3000-3300 Kv a 3s lipo and a 38mm prop wil get you where you want with this hull
my 2 cents

[conman13]

it's a 3974 can and only a 1200watt motor??
you get that power from a 2860 size motor!!
i don't think you can put in such a heavy /big motor in that hull : it's only 26"" and has a flood chamber ( limits the room inside)

that motor will sink your boat :-)

i suggest a 2860 or perhaps a 3660 size
3000-3300 Kv a 3s lipo and a 38mm prop wil get you where you want with this hull
my 2 cents

ok thanks I think I will go with the 3400KV leopard motor. because the motor has a max og 80 amps does that mean that you cant have any higher then an 80 amp ESC?

[iop65]

i had a 26" hull :leopard2860 2910Kv with a 38 mm 1.4P 2 blade tenshock prop , 3s 4000 40 c lipo , 90A seaking
runtime 6-7 min , 60-65 km/H ,motor and esc barely warm

i suppose but the 3400Kv ( also the 2860) will get it above the 70 km/h but will draw more amps turning that same prop , so i would go for maybe the 120A controller in combination with the 3400Kv

i would suggest propping down at first runs : 36mm to get the feeling before searching for the limits (maybe the motor can swing a 40 mm prop,check the temps! )
keep in mind that the boat probably isn't equiped with state off the art hardware so 37000rpm is going to be hard on the stuff

[785boats]

it's a 3974 can and only a 1200watt motor??
you get that power from a 2860 size motor!!
i don't think you can put in such a heavy /big motor in that hull : it's only 26"" and has a flood chamber ( limits the room inside)

that motor will sink your boat :-)

i suggest a 2860 or perhaps a 3660 size
3000-3300 Kv a 3s lipo and a 38mm prop wil get you where you want with this hull
my 2 cents

I have to agree.
And that much spinning mass in such a small boat will cause handling problems in my opinion.
I have had one of those hulls to build up for ages. Now I'm inspired.
This is the motor I have for it. 1600 watts in a 29mm motor.

http://www.hobbyking.com/hobbyking/s...ion_29mm_.html

A 120A ESC, 4s lipo, a de tongued X440/3 blade prop
That will be my setup.

If you are going to run 3s, then this one might be an option. A bit less total wattage available but still more than the big Aquastar.

http://www.hobbyking.com/hobbyking/s...ion_29mm_.html

[conman13]

Thanks again for the help. I ended up getting a leopard 3650 4550KV motor running in a 3S 5000mah lipo 20c constant with 30c burst. Also got a 120amp hobbyking esc. I'm keeping the stick 34mm prop for now and will eventually upgrade it. Hoping to run it on this setup for the first time tomorrow.


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[madmikepags]

what???? am I reading this correctly??? 4550KV on 3s = 50,000 rpm??? a 120amp speedo?? = smoke??? My race setups on ALL OF MY BOATS are between 27-32,000 rpm. Oh and 20C batteries??? prepare for more smoke? You should really read up a bit more on setups and how to calculate rpm and amp draw, but what you have is a recipe for failure and fire.

[conman13]

what???? am I reading this correctly??? 4550KV on 3s = 50,000 rpm??? a 120amp speedo?? = smoke??? My race setups on ALL OF MY BOATS are between 27-32,000 rpm. Oh and 20C batteries??? prepare for more smoke? You should really read up a bit more on setups and how to calculate rpm and amp draw, but what you have is a recipe for failure and fire.

do you mind explaining more??what should I do to fix the danger in this?

[olwarbirds]

Lipo: 20c at 5000mah = 100 amps constant 30c burst = 150 amps ...Motor: KV = rpms per volt a 3S lipo full charged = 12.6v so 12.6 x 4550 = 57,000 rpm and your using a plastic prop thats going to come apart....You asked for advice and ignored it, make sure no innocent bystanders get hurt....bring a good fire extinguisher

Do some research, your motor is to big and to high a kv for that boat and esc its going to pull more amps than esc and lipos can handle....40c minimum is what I suggest to all my boat customers..check out the speed calc up top of page to start....save that motor for a hot 2S boat

[conman13]

Lipo: 20c at 5000mah = 100 amps constant 30c burst = 150 amps ...Motor: KV = rpms per volt a 3S lipo full charged = 12.6v so 12.6 x 4550 = 57,000 rpm and your using a plastic prop thats going to come apart....You asked for advice and ignored it, make sure no innocent bystanders get hurt....bring a good fire extinguisher

I know ok I get it I made a mistake this is my first time with RC boats. I asked what I could do to make it safe to run.

[iop65]

good thing you asked before putting that in the water!!

but ,good advice was given and you ended up with that!

last try :

i can't see but: is that esc watercooled?rather usefull in a FE!

that coupler is a real danger for your boat ,yourself and anyone close, my god! please don't use that

motor not ideal but will do :good size but wrong KV so only and only using 2s!!!!!!

that toy prop : i wouldn't trust it

[conman13]

good thing you asked before putting that in the water!!

but ,good advice was given and you ended up with that!

last try :

i can't see but: is that esc watercooled?rather usefull in a FE!

that coupler is a real danger for your boat ,yourself and anyone close, my god! please don't use that

motor not ideal but will do :good size but wrong KV so only and only using 2s!!!!!!

that toy prop : i wouldn't trust it

ok thanks yes the esc is watercooled. I will get a 2s lipo to run it on and another prop. I will get another coupler but don't understand what is wrong with this one.