hairyaardvark Posted March 21, 2018 Share Posted March 21, 2018 Hello. Just wondering if anyone knows where to get a 2:1 reduction gearbox that is suitable for a 100hp engine (Subaru EA81). Redrive PSRU Gearbox Reduction Drive Belt Redrive in Poland used to make them but they don't seem to anymore. Foxcon don't make a 2:1 + the price quoted was AU$4000. Thank you Richard Link to comment Share on other sites More sharing options...
Aero28 Posted March 26, 2018 Share Posted March 26, 2018 Hi Richard, Buy a Rotax 2.6:1 B gearbox , save yourself a lot of net searching and angst. I spent a long time trying to get a belt drive to run true on my EA 81 but gave up and bolted a Rotax to a 16 mm plate to the bellhousing , now I have a smooth runing prop.(72 inch three blade Warp Drive). I paid ...I think $1960 for a new one off Mr Flood about three years ago. Cheers Paul. Link to comment Share on other sites More sharing options...
Methusala Posted March 26, 2018 Share Posted March 26, 2018 I think that you need a C or E type gearbox. B type wont handle much more than 50 hp. Link to comment Share on other sites More sharing options...
rotax618 Posted March 26, 2018 Share Posted March 26, 2018 2:1 is a very bad ratio, needs to be an uneven number or the same gear teeth take all of the power pulses and will soon fail. Ther was a CAM drive Honda with a 2:1 ratio, didn’t last too long. Link to comment Share on other sites More sharing options...
bexrbetter Posted March 26, 2018 Share Posted March 26, 2018 Research Autoflight New Zealand, Neil Hinz. Probably the best, but no idea of the price. Link to comment Share on other sites More sharing options...
Aero28 Posted March 26, 2018 Share Posted March 26, 2018 Oops, yeah "C" Gearbox Link to comment Share on other sites More sharing options...
fly_tornado Posted March 27, 2018 Share Posted March 27, 2018 aero momentum sell gearboxes and bits and pieces PSRU Aircraft Gear Box fits Suzuki Geo G10 G13 G15 G16 Subaru Honda and others | eBay Link to comment Share on other sites More sharing options...
fly_tornado Posted March 27, 2018 Share Posted March 27, 2018 or an air trikes conversion Air Trikes SPG4 gearbox conversion kit Subaru engines EA-81 82 EJ-18 20 22 25 | eBay Link to comment Share on other sites More sharing options...
Yenn Posted March 27, 2018 Share Posted March 27, 2018 2:1 is normally considered a bad thing for reduction drives but just about every 4 stroke that I know of has a 2:1 drive to its camshaft. Link to comment Share on other sites More sharing options...
Methusala Posted March 27, 2018 Share Posted March 27, 2018 Yen, I think that the camshaft has very little inertia so it would not be so affected by the power pulses as the output which drives a propeller of far greater mass. Just my thoughts, Don Link to comment Share on other sites More sharing options...
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