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Post by Andrew Rowland on Apr 1, 2016 1:33:44 GMT -5
Hi Chris I've found some 10t at 4.7mm dia. So far but really need to get an 11t. Essentially as designed there are 0.4mm of shim between crown and bearing. The designed 9t pinions are 4.4mm diameter so anything up to 2.2+0.4x2 =5.2mm diameter 'should' work provided the appropriate shims are substituted AND the number of exra teeth don't interfere with the engagement of the crown teeth..... A further solution would be to replace the nylon crown with a brass scratchbuilt one like I did in the Brabhma BT42 as that is likely to last longer with imperfect mesh...
I have emailed Art at Dart hobbies to try to get the motor but so far have had no responses. Where else can one get the prescribed motors?
As regards AB, I have ordered the 2 to 1.5 sleeves and still have some bits somewhere so that could be fine but believe I should be able to source the 1.5mm directly from other sources.
Thanks for the help and thoughts.
Cheers Andi
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Post by David Mitcham on Apr 1, 2016 2:04:40 GMT -5
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Post by chrisguyw on Apr 1, 2016 7:47:15 GMT -5
Hi Chris I've found some 10t at 4.7mm dia. So far but really need to get an 11t. Essentially as designed there are 0.4mm of shim between crown and bearing. The designed 9t pinions are 4.4mm diameter so anything up to 2.2+0.4x2 =5.2mm diameter 'should' work provided the appropriate shims are substituted AND the number of exra teeth don't interfere with the engagement of the crown teeth..... A further solution would be to replace the nylon crown with a brass scratchbuilt one like I did in the Brabhma BT42 as that is likely to last longer with imperfect mesh... I have emailed Art at Dart hobbies to try to get the motor but so far have had no responses. Where else can one get the prescribed motors? As regards AB, I have ordered the 2 to 1.5 sleeves and still have some bits somewhere so that could be fine but believe I should be able to source the 1.5mm directly from other sources. Thanks for the help and thoughts. Cheers Andi Andi, If you send me your address, I will be happy to send you a motor and an 11T pinion. An 11T true pitch (64P) pinion is a close to 5mm in dia. as makes no difference, so it should work, but as previously mentioned, it is a 2.0mm bore, so will need to be sleeved. Cheers Chris Walker
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Post by retroracer44 on Apr 1, 2016 12:44:54 GMT -5
The advantage of an FF or FK motor is that the leads solder onto the end of the motor. This allows for a smooth top surface with no interference for the driver/interior, which can even be glued to the top of the motor. An FC with its leads on top requires at least 1/8" more clearance, and an uneven surface. This may be critical in a tight GP car.
Cheers,
Keith
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Post by Phil Kalbfell on Apr 1, 2016 17:07:05 GMT -5
Problem is that the VRAA rules do not allow the FF motor. I think Munter mentioned he FK was higher than the FC so it will still be a very tight fit. The FC could be used in end bell drive and the terminals may just fit up inside the driver figure?
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