2:1 Reduction Gearbox

[hairyaardvark]

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

 

 

[Aero28]

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.

 

 

[Methusala]

I think that you need a C or E type gearbox. B type wont handle much more than 50 hp.

 

 

[rotax618]

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.

 

 

[bexrbetter]

Research Autoflight New Zealand, Neil Hinz.

 

Probably the best, but no idea of the price.

 

 

[Aero28]

Oops, yeah "C" Gearbox

 

 

[fly_tornado]

aero momentum sell gearboxes and bits and pieces

 

PSRU Aircraft Gear Box fits Suzuki Geo G10 G13 G15 G16 Subaru Honda and others | eBay

 

 

[fly_tornado]

or an air trikes conversion

 

Air Trikes SPG4 gearbox conversion kit Subaru engines EA-81 82 EJ-18 20 22 25 | eBay

 

 

[Yenn]

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.

 

 

[Methusala]

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