Re SV 27 Motor and Propshaft

[silvermansteve]

Hello. I really appreciate this forum. My questions today arise from my trying to re power an SV27 with a bad motor.

First: I measured the stock motor and it is 36mm-50mm, and NOT 36mm-56mm. Why is this? Is a proper, size-for-size replacement a 36-50 motor, and not a 36-56?

Second: I happen to have a 36-50, 1500kv motor sitting around. Will this work well here?

Fourth: Is the stock esc or even a 40amp esc sufficient?

Thanks to everyone . . . .



Steve

[forescott]

Either size will work fine in the sv. The sv 27 was my first brushless boat and I have had a lot of fun learning from it. I ended up selling the stock motor and replacing it with the Ammo 2300kv motor. But the stock motor is actually ideal for the boat. I believe it is a 6-pole motor which has a ton of torque! My ammo is a 2-pole motor(not as much torque) and in my opinion too high of a kv rating. It seems that any speed much over 40mph and the sv wants to take flight. I cant run my ammo 2300 at full throttle(even with a small 37mm prop) It is too unstable. Your 1500 kv motor should work fine. You will see a decrease in speed obviously because of the lower kv-rating. And your stock speed control is 45-amps an should work just fine. Also if you are not using lipo batteries already, consider the investment. Going from nickel cells to lipo was the single biggest upgrade I made for my sv. I gained 5mph from switching to lipo. Good luck!!

[Jeff Wohlt]

I think the stock motor is around 1800KV but the 1500 will work and you can probably prop up a bit if running 4S

[silvermansteve]

thank you both. i have it installed now. I will try it out with lipos too, i will probably solder in the lipo saver i have sitting around, as i'm still using the stock esc for now.

[BHChieftain]

A friend of mine runs his SV with a UL-1 motor and it works great,

-Chief

[Diesel6401]

A friend of mine runs his SV with a UL-1 motor and it works great,

-Chief

I run my SV with ul power and love it!!!!

[Brushless55]

I run my SV with ul power and love it!!!!

What do you like best about your setup?

[Diesel6401]

What do you like best about your setup?

It's just a nice upgrade over the stock. The boat seemed really happy with the speed and behaved really well. My buddy has a ammo 2300 in his and that thing is just wicked fast, it's just too fast for me. I feel more comfortable and I think the boat feels comfortable with it is a well. I'll get the gps speeds you asked for, I'm in the process of ordering a new one.

[Brushless55]

Right on man!
thanks

[BakedMopar]

I have a 12l for sale in the swap shop. This motor is faster than the stock one and I have run it on the stock speed control with no problems. Here is a little clip of it.

http://www.youtube.com/watch?v=ouwmfcTDTRI

[Brushless55]

Looks goon man!
what kind of speeds did you get out of it, and what prop did you like with that motor?
thanks

[BakedMopar]

No idea on the speeds as we don't gps our boats. I was running a x442 with added cup and temps are all under 140 for a 4 minute rin in humid Hawaii weather.

[Diesel6401]

Well gps'd the boat today. This time I ran with 2x 2s Turnigy 4000mah 40c's and I hit 47.4mph with trim tabs & strut neutral. Boat ran very well no hopping or bouncing. Looked GREAT on the water. Still used a grim 42x55, man I love that prop.

[Brushless55]

Well gps'd the boat today. This time I ran with 2x 2s Turnigy 4000mah 40c's and I hit 47.4mph with trim tabs & strut neutral. Boat ran very well no hopping or bouncing. Looked GREAT on the water. Still used a grim 42x55, man I love that prop.

47.4mph, Sweet!

[Brushless55]

Does anyone think the 11L form HC would be to much for this boat?
I've also thought about the Turnigy 3556 1800kv?
I had my 3rd SV motor go on me today!
I had a cooling issue and she got a bit to hot and slightly demaged the rotor..
temp was 176* at the end of the can
I was running 5s on a S220 prop and made some fast passes and did a massive flip and back spin that sent my SV upside down for several minutes.
after drying things out, I tried to back up the speed on the GPS but noticed the boat seemed slower?

but I did manage 47.2mph on 5s right before I brought it in.. and checked the temp of 176*
so I don't know if the 55.7mph was a fluke or not