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Model Forum / Radio Controlled / Air Models / July 2008How can I fit a different sized brushless motor to my gearbox?
I found what seem to be some very excellent values for Brushless motor at HobbyCity.com http://www.hobbycity.com/hobbycity/store/uh_listCategoriesAndProducts.asp?catnam e=All+Inrunner+Motors&idCategory=64&ParentCat=59 How can I fit these motors to my existing Slow Stick gearbox? (The motors have a different diameter and their shaft also has a different diameter). Where are some places where I can get high quality and low cost gearboxes that will fit these motors that will provide the same kind of performance (same weight) as my original gearbox? How do I know what gear ratios to select? IMHO, putting a gearbox on a todays brushless motors is the wrong thing to do. You lose some efficiency. Many of the outrunner brushless motors turn much slower (lower RPM/Volt) than the inrunners or brushed motors and a gearbox may not be needed any more. Use Motocalc to be constrained to choose a brushless motor without a gearbox when you run that program. Just choose the same prop is the geared motor solution. Then pick the motor that weighs the least or less than the motor w/ gearbox you are replacing and you can afford. I find Motocalc a very useful tool for playing "what if....." when it comes time to choose a motor, prop and batteries. Generally I do not go with the recommended motor for most projects. Sometimes I opt for a cheaper motor. Sometimes I go with an inrunner when an outrunner was recommended. Sometimes I want a solution the uses fewer cells (lighter weight) when I use Nicads/Ni-Nh. I do not know how anybody can get by without it if they are serious about electrics. Bill > I found what seem to be some very excellent values for Brushless motor at > HobbyCity.com [quoted text clipped - 8 lines] > (same weight) as my original gearbox? How do I know what gear ratios to > select? > I found what seem to be some very excellent values for > Brushless motor at HobbyCity.com [quoted text clipped - 9 lines] > the same kind of performance (same weight) as my original > gearbox? How do I know what gear ratios to select? Dont use a gearbox. Not for low KV outrunners, they sort of come with an analogue to a gearbox built in.. |
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