Don Dunbar wrote:

Hi Pual and group,
Well I have been looking for a planetary gear set with a better ratio that would suite our application.
I have found something that will interest the turbo engine and will handle the 20b turbo. I am awaiting the price for a new reduction gear from the manufacturer as a spare part.
The reductions available are 1.52, 1.88,  2.1, 2.57 and 2.91 to 1. This is a 6 geared planetary and weights 44 lbs. with drive flange of 5" diameter to suite the propeller.
For the marine industry driving a propeller it is rated at 550 hp at 5000 RPM or 595 lb ft.  At input speed for 5% of the total time and 80% of rpm for 400 hours per year.
This gear box with its cast steel casing with an adapter plate will bolt to the series 5 auto bell housing without modification.
 I have taken photos of this unit which is 8.5 " long, I will post the photos in the next few hours after I download from the camera.
If you are interested go to http://www.velvetdrive.com for info, the reduction unit is the bottle looking piece that hangs of the 1 to 1 reversing unit.
Regards Don Dunbar

 
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