PSRU'S

How planetary gear boxes work. Pictures by Doug Fir November 2006.

Original Ross Ford C6 planetary based PSRU. Still in use wide use after 30 years. dwg.

Picture - Ross Aero Planetary Reduction Unit

The Ford/Jatco parts and how they can be used to build various gear ratio PSRU's.

Adapting Tracy Crook's redrive (RWS) to stock Mazda bell housings.

Example of a home made Ford C6 planetary based PSRU. This one by Edward Heishman

Don-Dunbar's home made Ford C6 planetary based PSRU dwg.

Picture of Don-Dunbar's home made Ford C6 planetary based PSRU.

Photo - Large variety of planetary gear sets from the Ford A4OD

Photo - Four Ford pinion carriers with dimensions from the Ford A4OD

Ford E4OD heavy duty six pin planet carrier.

Experimental Gearbox based on Ford C6 automatic planetary gear set dwg.

Details of Experimental Gearbox showing captured sun gear dwg.

Built in dyno in Ford planetary based PSRU's dwg.

Belt or chain PSRU design showing the need for outboard bearings dwg.

Bell 47 helicopter 45 pound 1000 HP final drive gear box mounted to Mazda rotary engine.

Bell 47 helicopter 45 pound 1000 HP final drive gear box disassembled on Mazda rotary engine.

Bell 47 helicopter final drive planetary gear set.

Formula for calculating the stress on a hollow prop shaft due to torque alone. Prop shafts are also subjected to bending loads up to 650 foot pounds.

Light weight hollow shaft direct connect PSRU design 3D.

Light weight hollow shaft direct connect PSRU design 3D .

Light weight hollow shaft direct connect PSRU design. Method of attachment 3D.

Light weight hollow shaft direct connect PSRU design complete 3D.

Lycoming front main bearing based constant speed prop capable PSRU design. Method of attachment 3D.

Lycoming front main bearing based constant speed prop capable PSRU design planet carrier details. Method of attachment 3D.


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