Joe,

The Scorpion S-4035-210 motors were custom wound at the factory at my request for 4-5 different customers. This is not a normally stocked item, and the replacements also need to be custom made, so they are not readily available.

Scorpion has changed the design of the S-4035 series motors, and is in the process of re-introducing them as the new SII-4035 motors. There are several design improvements that have been made to the motors to improve the quality and performance. These changes include:

1. New Stator material for higher efficiency and lower core losses.
2. Re-designed front housing (Similar to the SII-30mm motors) for improved cooling
3. Added a retaining lip on the back edge of the rotor can to prevent the magnets from pushing out under extreme stress
4. Added the option for a bolt-on prop adapter to the front end of the motor.

In addition to these changes, I also asked Scorpion to slightly lower the Kv value of all the different models of the motors to be more in line with what the customers are asking for. The changes in stator material on the motor naturally lowers the Kv of the motors, so instead of compensating for this by removing a turn on the motor to bring the Kv back up to the original value, I have asked them to let the Kv drop a bit. With these changes, the Kv values of the motors should change to the values shown below.


The S-4035-250 will have a new Kv value of about 210

The S-4035-330 will have a new Kv value of about 280

The S-4035-380 will have a new Kv value of about 350

The S-4035-460 will have a new Kv value of about 420


The guys flying F3A pattern will really like the new 210 Kv model, since it will provide even more power than the earlier model, and be a mechanically stronger motor as well. As soon as these come in, we will see that you get one right away. Right now, it looks like they will be available sometime in mid April. If you want to check back later I might have more up-to-date information at that time.

Thanks for your patience!