Cyclon for Open A

At right the Cyclon PC 3 is a little more difficult to mount on an HDPE plate than a normal engine.  The fins add extra cooling to the engine.  Below you can see how the HDPE Is cut to fit the engine.

The Cyclon spinner nut actually goes into the prop.  The prop must be reamed out to a total of 8MM.  This is a big increase over a standard prop bore.  To do it accurately a fixture shown below is made to hold the prop in place.  A 3/16" drill bit is chucked and slowly dropped into the prop hole to center the prop under the drill chuck.  Once it is centered and bolted into place a quarter hole is drilled then a Great Plains metric step reamer is used to open up the prop.