I am building my first electric powered model, and have a question about the motor. It is an AXI motor and the drawing shows a lock collar on the rear shaft [they furnish the lock collar], so it must be important. I really see no reason for it unless it holds the shaft in the motor when the prop on the other end is pulling, and this seems a rather stupid way to do this. What is the purpose of this lock collar?
I am not sure what you are talking about, but I think you are looking at the kit for mounting to a normally positioned firewall. The idea is as follows: -> Mount the motor to the firewall using the normal mounting holes on the bell. This leaves the normal propellor shaft pointing to the rear (basically, into the tank compartment.) You may cut off this shaft, but Be Careful NOT TO GET ANY SHAVINGS in the motor where the magnets will jam them into the stationary part in the center. -> The piece you have should mount to what used to be the rear of the motor, and the prop mounts to it. When the outside of the motor spins, it turns the prop.
There is no real difference in the motor's operation. In the normal case, the shaft (which is attached to the outside of the motor at the rear) spins the prop, and the motor is mounted to a front mount through which the shaft passes.
Hope this helps,
-- Mike Norton
My understanding is that the locking collar is put on the shaft to stop the motor pulling apart when it's mounted the way you intend. If you're AXI is like mine, there's a tiny circlip that holds the motor together, I guess they thought it wouldn't be man enough for the job on it's own...
-- Philip Rawson
When the motor is used with the clip at the front... ie, without the prop adapter you've bought, there's no load on the clip... when you turn the motor round and take the drive off the back the clip is taking the full force from the prop... even with my tiny AXI, that's 2lbs of thrust... with a bigger motor that figure could be up to 10 - 15lbs... I wouldn't trust the tiny circlip with that...
I have used the motor both ways round... when running it backwards I used the locking collar... but then again I did lose the circlip when I took the motor to bits!
-- Philip Rawson
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