Building a Prop

[gmcjetpilot]

Originally Posted by DanH

Well, to be fair, a chisel yes, but a power saw, sanders, etc. And I am gonna build a CNC propeller machine eventually, given the ready availability of prop software that outputs XYZ blade coordinates. After all, this is 2008.

My duplicator is similar to a Pro model Gemini, but with increased arm stiffness....and it can be purchased for less since I'm now done with it.

Nice are you going to start making props for RV's? Hummmmmm, inquiring minds want to know? Why not you got the mad skills, tools and aero knowlege, plus a RV test bed.....

PS Yep saw the power sander & saw; I'm sure they had those in the old days, just steam or mule driven.

[DanH]

I've listed the propeller duplicator on Barnstormers, so ya'll spread the word if you know someone who might like one. Look under "Propellers". Thanks.

[Jerry Fischer]

Ain't woodworkin' fun, challenging, and very rewarding?
You bring back the days I was living outside Louisville KY and an active member and cabinetmaker in Kyanna woodworking guild which encompassed northern KY annd southern Indiana. A dumb question, does the sugar maple need some protection from absorbing moisture (and therefor warping) from not
being sealed?

[DanH]

Jerry,
My understanding is that all wood, given time, sealed or not, absorbs moisture until it reaches an equilibrium with it's environment. ANC-18 structural values are based on 15% moisture content (continental US) and 20% (tropical, 90% relative humidity for long periods of time).....point being, structural wood has significant moisture content under normal conditions.

I think the real purpose of "sealing" wood to moisture stability. Although overall moisture content may drift up and down over time, it is not 10% in the heat of the afternoon, 25% in the night dew, and 50% when left in an all-day rain. Nor is it 20% on one face and 10% on the opposite face, a warp for sure.