Pietenpol-List: scimitar prop
Posted: Wed Sep 29, 2004 10:51 am
Original Posted By: Michael D Cuy
Chuck;There have been many scimitar props built and flown. For a really interesting one, see recent Contact! magazine #76 on David Roe's highly modified Hummelbird airplane with "Aeromorph" super short-stroke VW engine and... scimitar prop. It's made of oak laminations (the hub and about half of each blade), with the tips and the outer half of each blade made of a composite material for resistance to erosion. I don't know that it is intentionally designed to flex in torsion to change the blade angle of attack, but I would suspect that it does some of that simply due to the scimitar shape and the inherent flexibility of the composite material.Warnke's "Almost Constant Speed" wood props have always touted this as a feature of the design... with a bit of torsional flexure to allow changing angle of attack at various engine loads.Oscar ZunigaSan Antonio, TX________________________________________________________________________________Date: Wed, 29 Sep 2004 12:12:19 -0400
Chuck;There have been many scimitar props built and flown. For a really interesting one, see recent Contact! magazine #76 on David Roe's highly modified Hummelbird airplane with "Aeromorph" super short-stroke VW engine and... scimitar prop. It's made of oak laminations (the hub and about half of each blade), with the tips and the outer half of each blade made of a composite material for resistance to erosion. I don't know that it is intentionally designed to flex in torsion to change the blade angle of attack, but I would suspect that it does some of that simply due to the scimitar shape and the inherent flexibility of the composite material.Warnke's "Almost Constant Speed" wood props have always touted this as a feature of the design... with a bit of torsional flexure to allow changing angle of attack at various engine loads.Oscar ZunigaSan Antonio, TX________________________________________________________________________________Date: Wed, 29 Sep 2004 12:12:19 -0400