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<< Lancair Builders' Mail List >>
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What is a PSRU? I have purchased a subaru and will be using a hydrolic
constannt speed prop. I hope.
Bobby
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PSRU stands for prop speed reduction unit. Because props (for the most
part) are designed to spin much slower than auto engines turn you have
to bolt a psru to your subaru to reduce the engine rpm at the prop.
We are also putting a Subaru 6cyl in our White Lightning. This engine
will turn about 5,000-6,000 rpm and with a 2.2:1 psru, the prop will
turn between 2,200 rpm and 2,700 rpm. To date, we have not found anyone
who has then mounted a hydraulic constant speed prop to this
configuration. The Marcotte PSRU has the capability to supply oil to
the prop, but can't find anyone who has done this with a constant speed
prop governor; therefore the electric constant speed is being considered.
Greig Huggins
LML website: http://www.olsusa.com/Users/Mkaye/maillist.html
Builders' Bookstore: http://www.buildersbooks.com/lancair
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