TORQUE MASTER 
Reduction drive unit by 
AIRDROME AEROPLANES

Facts

• As a propeller tip speed increases the efficiency decreases.

• The larger the diameter of the propeller the more effective disk area it has. 

• To increase disk area is to increase thrust

• It is common practice to decrease the diameter of the propeller to increase its rpm to get more horsepower from the engine. 

• As a general rule of thumb if you increase the engines rpm that will increase its horsepower

• If you reduce that rpm by half thru a reduction unit you will double the torque output of the engine.

• Horsepower is not the determining factor for sizing a propeller.

• Torque is the determining factor for sizing a propeller.

• It is more efficient to go with the larger diameter propeller at a lower rpm.

• If you increase a propellers diameter from 60" to 84" it will increase its effective disk area by 96%.

• Any increase in the props effective disk area. will increase its output .

GOODYEAR EAGLE BELT DRIVE ADVANTAGES

• Self Tracking sprockets thus flanges not reg. that normally wear belts by forcing them to track.Belts provide shock damping to crank shaft. Eagle belts do not require retensioning, as do V belts

• Drive face width angled tooth results in 90 % more area than straight-faced belts of the same width

• Noise comparison on average these drive reduce noise by 19 db

• Bearing load reduction over 30% as a result of less tension required 

• Product efficiency at 98.5 % efficient it is the highest in the market that translates to more useable power at the prop

• Belt strength comparison eagle belts stretch less than 20% of their poly chain counter parts under a full load 

TORQUE MASTER REDUCTION UNITS 

• Driven off the pulley end of the engine this unit offsets the crank only 5.875 "

• Ratio is 2.125 /1 

• Engine at 3800 rpm / prop is at 1788 rpm for prop up to 96" in dia with a tip speed of 749 fps

• Bolt on no welding or machining 

• Prop loads carried by the case not the crank

• Standard rotax bolt pattern on prop flange

• Weight approximately 11 lbs 

• Fits all type 1 vw engine cases from 1600cc up to 2275 cc

• Torque master reduction unit $1295