Alternative Power

PSRU

Alternative Power has the airplane PSRU currently flying in many different
aircraft. This unit weights a mere 60# complete, depending on the version
requested. This PSRU is a cast aluminum one-piece unit made in our own
foundry. We have done all the flight testing in a Cessna 172 that has
logged over 350 hours total flight time using our Chevrolet 350 V8 PSRU.
The latest innovation incorporated into the manufacture of our PSRU is the
Sprague clutch system. We will show this at the EAA Convention this year.
This is currently available as a special order option. This option will be
showing up in the airboat industry very soon.

 

Exploded  view of gearbox

Alternative Power is offering 55 lbs. Chevrolet V8 engine chain reduction drive in  1.6 or 1.8 ratio. Crankshaft  to prop centerline lengths of    6.125,   7,   8.625    or 9.25  Prices starting at $3500 each.
Information Kit with video and software available for $35.00

 

Front view of gearbox

REDUCTION GEAR DRIVE:

DESIGNED AND PRODUCED BY ALTERNATIVE POWER CO.              

APPLICATION: CHEVROLET SMALL BLOCK, BIG BLOCK, AND LS1 ENGINES.

CONSTRUCTION: ALUMINUM CASTING, HARDENED STEEL, TIMKEN BEARINGS, AND MORSE CHAIN.

WEIGHT: 55 LBS. (MODEL 101)

POWER HANDLING: 600 HP

CHAIN RATIOS:  with the long chain a 1.8:1 ratio = 8.5" between shafts and a   1.6:1 ratio = 9.25" between shafts.  With a short chain a 1.8:1 ratio = 6.125" between shafts and a  1.6:1 ratio = 6.875" between shafts.

OPTION FOR TWO PULLEYS ON REAR OF MAIN SHAFT FOR ACCESSORIES

 

 

 

Back view of gearbox
FEATURES:

THE MORSE 5033 CHAIN USED WAS TESTED WITH A 20,000 LBS PULL TEST.  THIS 1.25" CHAIN HAS A HEAVIER PYRAMID SHAPED PIN AND DOES NOT HAVE A MASTER LINK, AND AS A RESULT IT HAS THE SAME HP RATING AS OTHER MORSE HY-VO CHAINS THAT ARE 2" IN WIDTH. (SEE PHOTO RIGHT).  THE VALUE OF USING A 1.25" WIDTH CHAIN IS THE REDUCTION OF WEIGHT RESULTING FROM A STEEL GEAR THAT IS NARROW.

300+ HRS ACTUAL FIGHT TESTING ON THE CHAIN TO DATE. 

UNIT 101 HAS SPRING LOADED IDLER MECHANISM ELIMINATES CHAIN FLUCTUATIONS.

Bearings, gears and chain
MODEL 102 HAS A SPRAG CLUTCH INSTEAD OF A SPRING LOADED IDLER MECHANISM.

- THE SPRAG CLUTCH ELIMINATES ALL "POWER PULSES".   ON THE POWER STROKE OF THE PISTON. THE  "ONE WAY" GRIP OF THE SPRAGUE CLUTCH  ON THE MAIN SHAFT IS RATED FOR 2000 HP.   ON THE RECOVERY STROKES OF THE PISTON THE CLUTCH RELEASES AND THE PROP CONTINUES AND THUS REMOVES MICROSECOND  PULSES THAT CAUSE FRACTURES AND FATIGUE TO THE CRANK AND THE PROP.   OTHER RUBBER BISCUIT DESIGNS ARE GOOD BUT THE THE POWER PULSES ARE STILL EVIDENT AT LOW RPM.  THE SPRAG CLUTCH PROVIDES A SMOOTHNESS AS IF YOU WERE SITTING IN YOUR CORVETTE.  THE COMPONENT CHOSEN IS THE SAME AS  FOUND ON SOME TURBINE PROPELLERS AND HELICOPTERS.

MODEL 103: HYDRAULIC CONSTANT SPEED DRIVE: (IN TESTING)

- FITTED WITH BRACKET FOR HARTZELL PROP GOVERNOR

- USES ENGINE OIL  RECIRCULATED BY A SCAVENGER PUMP

- 75 LBS TOTAL WEIGHT

Chevrolet LS 1 Gearbox
 

OPTIONS & COST:

101 UNIT: $3,500.00   (WITH IDLER MECHANISM)

102 UNIT: $4,500.00  (WITH SPRAG CLUTCH )

103 UNIT: $5,700  (WITH  SPRAG CLUTCH AND  Hydraulic Constant Speed)

 

Cessna 172 Chevrolet V8 350 1967 Cessna 172 has 350 hours of service.
VK 30 Installation     VK 30 Pusher Engine
V6 Engine Complete 1970 Cessna 150  V-6 Chevroler 4.3 Installation