Test Mule PSRU

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Test mule prop speed reduction unit (PSRU)

Here’s an interesting idea, a test mule propeller speed reduction unit. A very wide belt tension adjustment range allows the installation of almost any drive pulley diameter, thus many different reduction ratios (and matching propellers) can be test flown without major modification.

A similar system with a limited adjustment range may be available at a later date.

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Dan Horton
Dan Horton has been crazy about airplanes since dope was a good thing. When not in the shop or researching some subject of interest, Dan can be found in his Van’s RV-8. He has been flying more than 40 years, and has not yet caused an international incident. That we are aware of, anyway.

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