I've always assumed (bad habit, I know) the motors were the same apart from the extra bit of armature shaft and second pinion on the RX-81. The RX-61 is supposedly the "hotter" motor, as fitted to the SRS cars, though it does have a slightly longer armature shaft. Not that that can't be easily rectified.
Talking about Rx-41 and Rx-81, there are different versions. Initially the production started in China, but two years ago Tecnitoys (SCX manufacturer) brought the motor's production to Spain, and modifiying several little aspects improved the quality, gaining rpm, brake and torque. There are no external differences between both versions, so it's not obvious know if a motor is made in Spain or China.
There are also a "pro Turbo" version of both motors, same structure than classic versions but at 18.000 rpm.
Although, the latest 4wd cars and 2wd cars, equipped with motors still carrying the 41 and 81 moniker, are considerably faster than previous ones.
The clue, other than the vintage, is in the font used to shout the motor name and in the way that the silver part of the can now folds, oh, so slightly, in to the hole where the armature sits; I think it how helps hold the mugnuts in place.
FZR, speak to me nicely on Tuesday and I'll show you what I mean.
Storing motors - does everyone just throw them together in a box no matter what make they are or should they be stored individually? I was just wondering if the magnets had an adverse effect being chucked in a heap with others?
Cheers - Phil B.
It depends on the type of magnet, but as a general rule - keep the motors physically separated, preferably by several inches. It may take considerable time, but even modern magnets can lose a portion of their strength when in close proximity to other magnets. And never store them in a heap!
SCX Dome Judd uses, i think, rx c 62.
for those who haven't appreciated the 'suspension' on the Dome, it doesn't work for me on magnet tracks but is great w/out the magnet, i put this motor in an scx audi r8. the audi was transformed. not great but much better. locked the dome suspension level and that car also was much better.
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