Alternate Airpower - Propeller Speed Reduction Units (PSRU)

Smooth Automotive Power for Your Homebuilt


Anderx Innovations Corp. purchased the assets of Alternate Airpower and

is evaluating the feasibility of putting these PSRUs back into production.

Interested in a Geschwender designed PSRU?  Email: lganderz@gmail.com

Updated: August, 2021


For over 35 years, Geschwender has been a respected name in auto engine conversion. For builders of experimental, agricultural and utility aircraft engines, the Geschwender design offers time tested performance and reliability. The simple design utilizes a Hy-Vo chain for smooth, efficient, vibration free power transmission. The modular construction installs easily.

     
    Specifications
    Geschwender PSRU:
    • Weight, lbs...................................78
    • Reduction Ratio.............................2:1
    • Max. Prop Dia..............................106"
    • TBO.............................................2000 hr.
    • Prop Flange...............................Various
    • Lubrication.................................Engine Oil
    • PSRU Type................................Hy-Vo Chain
    • Block Face to Prop Flange Face........14.5"
    • Crankshaft to Prop Shaft CD.............7"
    • Mounting  -  Width without ears........16"
    • Mounting Ears Height above Crank..3.5"
    • Mounting Ears Distance from Block..5"

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                           UNIT PRICE To Be Announced
       
       
       
       
       
       
       


      Worden Engine Mount
      John Worden's project. Click to see more.


    Fred Geschwender and one of his conversions. 
    This is a 460 cu in Ford SVO with an earlier model redrive.

    Fred Geschwender originally designed his reduction unit in the early 1970's, as part of an automotive engine conversion that was intended to take the place of a Pratt & Whitney 1340 on agricultural and utility aircraft such as Beavers and Otters. The latest Geschwender design, at only 78 lbs., will provide an exceptional margin of safety and performance when installed on V6 or V8 GM engines. There is an informative article in the March 1997 issue of Sport Aviation magazine on Fred Geschwender, automotive engines for aircraft, and the Geschwender reduction unit.

    Features:
     
    • Fits GM V6 and V8 engine blocks.
    • Efficient power transmission with Hy-Vo chain.
    • Simple two piece magnesium alloy case.
    • Compact envelope dimensions for easier fit in small nacelles.
    • Optional prop flanges.
    • Supports constant speed or fixed pitch props.
    • Heavy duty pressure lubricated prop shaft bearings.
    • No requirement for additional vibration damping.
    • Simple installation - installs and removes as one piece.
    • Integral oil plumbing.
    • No requirements to reverse engine rotation.
    • Conservative design standards.
    • CNC machined.

    View inventory
    Narrow model available.


     

    To find out more contact:

    Anderx Innovations Corp.
    Oceanside, CA 92056
    (858) 431 - 6428
    lganderz@gmail.com