Pro Motors? Patrick?

[lutach]

Originally Posted by SpEEdyBL

You can't always tell if a motor is wye or delta by looking at the inside. The lehner 19xx series for example can be switched from wye to delta only by resoldering a few connections on the rear endbell. You don't need to alter the coils.

Yes and that's a plus for Lehner, but the minus is the price and that takes the 19xx out of it. It would be awesome to see a 19xx competing with the weak 200-300 watts motors. Man Lehner is missing a big share of the market if one stops to think about it.

[SpEEdyBL]

Which "weak" motors are you referring to? Brushed?

[lutach]

Originally Posted by SpEEdyBL

Which "weak" motors are you referring to? Brushed?

The current crop of sensored motors. They spin fast, but could never make the power of even a Lehner 1920.

Lutach, the Novak motors (lower turn ones mainly) are nearing 1 hp in power output. I think the 3.5R puts out about 620 watts according to the Novak motor chart. From the 6.5R and down, they're all putting out more than 300 watts if decent battery is being used. You're right though, their motors spin pretty fast (10k Kv is freaky).

To be fair....Lehner is...err....well, they're Lehners.

[lutach]

Originally Posted by Five-oh-joe

Lutach, the Novak motors (lower turn ones mainly) are nearing 1 hp in power output. I think the 3.5R puts out about 620 watts according to the Novak motor chart. From the 6.5R and down, they're all putting out more than 300 watts if decent battery is being used. You're right though, their motors spin pretty fast (10k Kv is freaky).

To be fair....Lehner is...err....well, they're Lehners.

Just imagine if they could do over 1400 watts like the 1920. That would be awesome. I'm going to have someone modify my HV4.5 to a lower turn motor and wrap the magnet with Kevlar or Carbon Fiber. I'm planning on making a speed record for 2S lipos. Should be fun.

1400 watts would be unncessary, and therefore, JUST barely enough to have fun....

Make the HV motor a 1.5 turn, and see if you can source a bigger diameter rotor. HEHEHE!

[lutach]

Originally Posted by Five-oh-joe

1400 watts would be unncessary, and therefore, JUST barely enough to have fun....

Make the HV motor a 1.5 turn, and see if you can source a bigger diameter rotor. HEHEHE!

A Lehner 1920-3 would be my choice for crazy fast power. I already found a few sources for a bigger rotor, but I don't know how good they'll be. Plus they want me do send them a detailed drawing with dimensions for the rotor. I can't do anything like that though. I might get the 5mm conversion and send that as well to get a wrapping treatment.

[SpEEdyBL]

The 3.5r went nearly 80 mph on 2s at the fastest rc-car challenge. Novak actually answered why a wider rotor isn't better. They said that the bigger the rotor, the smaller the airgap between the stator and the magnet, which causes the iron core to become oversaturated, thus producing more heat and lower efficiency. In other words, you would need a bigger stator in the novak hv motors for a wider rotor to be affective.

Oh... They need a bigger stator and then a bigger rotor then....

[lutach]

That's good. Then I don't have to actually draw anything . Does anyone know what the strength on Novak's magnets? The rotor might have space to have it wrapped with Kevlar. That should be good to hold the magnet together under extreme RPMs. A new 2S record shaw be set .

[SpEEdyBL]

I think the original rotor (the non sintered one) was 14mm and the sintered one is 12.2 mm so you should be able to wrap it with at least .9mm of kevlar.

[lutach]

Originally Posted by SpEEdyBL

I think the original rotor (the non sintered one) was 14mm and the sintered one is 12.2 mm so you should be able to wrap it with at least .9mm of kevlar.

That's plenty of space. It should be interested to see a lower turn Novak HV motor.

What are you going to run it on, and what turn have you decided on (if you have decided)?