this should clear some things up...
Sintered rotors are available in some motors off the shelf, out of the packet (LRP 4.5 for example)
Here is an edited quote from Paul worsley in reply to my email on the topic of rotor swapping
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brushless motors using sintered rotors are legal for use at BRCA sanctioned events from April 2nd.
This includes Off-Road Nationals, as brushless was accepted at our Section AGM for 2007.
Allowing the sintered rotor was an EB decision at a later date, so that we are the same as EFRA.
I am not yet convinced that it is what Off-Road needs, but it would not be viable to have different Sections running to different rules within the same class of motors and policing the rotors would be impossible.
Swapping rotors :- This is not easy for me to answer yet, I need to see the new motor versions using sintered.
The situation has been complicated by the further rule change that allows Delta wind.
It is possible that the manufacturers will make the sintered motors with Delta wind. If this is the case, then swapping the rotor would create a 'hybrid' motor as you would not be able to purchase (or previously have purchased) a 'Wye' wind with a sintered rotor. This effectively means that you have a motor that has never been produced.
Certainly, you will not be allowed to swap rotors with different manufacturers. (EB Rule 4.5)
I will update you when we know more about the situation.
All the best,
Paul.
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so basically, the situation is not clear about rotor swapping, neither does it need to be until they are legal for 2/april/2007
Hope this clears things up
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