Which is better SV27 or Blackjack motor?

[domwilson]

I was wondering, for a 27" Cat. Which motor is better on 4s1p? All other things being equal. Let's just say 2x4800 25C 2s1p lipos and a x640 prop. Hydra 120 ESC, etc.

Which motor do you think performs better and/or has better reliability. Yes, I already know, the NEU's are better.

[NorthernBoater]

For $10 more I would go with the Feigao 540XL 9XL unless you already have both. The longer can will give you more torque which will in turn spin a prop better.

[domwilson]

Actually I do have them as well as a couple of 9XL's. I'm just trying to figure out which one of the two to give to a friend who is new to the hobby.

[NorthernBoater]

Actually I do have them as well as a couple of 9XL's. I'm just trying to figure out which one of the two to give to a friend who is new to the hobby.

I think running in a cat the lower Kv of the SV27 motor would work out better.

[domwilson]

I believe the proboat has a kv of 1500 while the aquacraft is around 1800. I've read that the proboat has more torque.

[NorthernBoater]

I believe the proboat has a kv of 1500 while the aquacraft is around 1800. I've read that the proboat has more torque.

I was thinking of the UL-1 motor.

[RCprince]

The BJ motor runs smoother and is a better quality motor than the sv motor.

[domwilson]

Being that the KV is pretty close to each other, which do you think will give better speed?

[Jeff Wohlt]

BJ motor is better overall. You can prop it up and runs cooler and can run up to 6S.

[domwilson]

Cool. Thank you guys for the replies. I've read that some were having problems with the windings on the SV27 motors. I will try the PB motor and ESC in the cat.

[domwilson]

Any others want to chime in on this one?

[Diegoboy]

I too like the BJ motor better.

[Darin Jordan]

I can tell you from actual testing that the KV on these two motors is NOT that close... I ran several controlled bench tests on all of these motors, and the SV27 motor comes in around 1566KV no-load, and the BJ26 motor is 1680KV no-load.

I've tested several SV27 motors and not one of them had a real KV over 1570KV...

All of this was with a stock SV27 ESC, by the way, using a fresh 4S1P 4500 Elite Lipo pack each time...

Based on many other tests I've done, it is my opinion that the ProBoat motor gives the best combination of RPM, Torque, and quality, overall, and would be my choice, but that either motor can be made to work.

I also believe that the ProBoat or SV27 setup has some good advantages over the UL1 motor, for certain applications, where torque and the ability to run a larger prop are a benefit... (Monos, some cats, etc.)

The bottom line is that, once again, it depends on the package as a whole. No one motor is the answer...

[domwilson]

I can tell you from actual testing that the KV on these two motors is NOT that close... I ran several controlled bench tests on all of these motors, and the SV27 motor comes in around 1566KV no-load, and the BJ26 motor is 1680KV no-load.

I've tested several SV27 motors and not one of them had a real KV over 1570KV...

All of this was with a stock SV27 ESC, by the way, using a fresh 4S1P 4500 Elite Lipo pack each time...

Based on many other tests I've done, it is my opinion that the ProBoat motor gives the best combination of RPM, Torque, and quality, overall, and would be my choice, but that either motor can be made to work.

I also believe that the ProBoat or SV27 setup has some good advantages over the UL1 motor, for certain applications, where torque and the ability to run a larger prop are a benefit... (Monos, some cats, etc.)

The bottom line is that, once again, it depends on the package as a whole. No one motor is the answer...

Good info. Darin. Thanks

[Jesse J]

Ditto on BJ motor. It pushed my DF26 at 50 on 6S and was still <120F. I like the motor (oh by the way that was with stock ESC... and it was same temp - with internal BEC disabled).