NHC has developed a beautiful as well as durable planetary redrive for the sport plane industry. This PSRU (Propeller Speed Reduction Unit) comes in 4 ratios: 1.84, 2.18, 2.84, and 3.18. We currently have adapter kits to fit the Mazda 12A & 13B as well as the Subaru EA82, Legacy EJ22, EJ25, & EG33 6 cylinder engines which have up to 230 H.P. These units are polished to a nearly chrome look and are in line with the crankshaft which allows a truly unique aircraft look to most engines. There are no noisy belts to adjust and keep tightened. The torsional vibration is eliminated by a multiple sprag system that allows the propeller to spin freely in one direction and completely lock in with each engine pulse. No chatter or unwanted noise is the result. This unit is machined out of 6061T6 aircraft aluminum and weighs about 45 lbs. The shaft is machined out of tool steel and hardened to RH 58 and has an additional 1/2" aircraft bolt for redundancy. This unit consumes about 1/2 the horse power that an equivalent belt drive system does at about 5%. The complete unit sells for $3,295.00 with a 50% down payment and delivery within 30 days. For more information please contact us at the address above.