Re: prop shape needs to be flat on windward side? (3.00 / 0) (#15) by Stonebrain on Tue May 13th, 2008 at 05:43:56 PM MST (User Info)

If you take a symmetrical airfoil,naca 0020 or so,the sides are ..kind of.. flat from the thickest part to the trailing edge.What counts is the angle,more than the exact shape.If I look at your yellow thing(don't forget to drink your coffee),I would say it's not so bad. naca 0020(the lowest one)The upper is the same,but the chord bended on a circle.

Re: prop shape needs to be flat on windward side? (3.00 / 0) (#16) by Norm (peppysue@suite224.net) on Tue May 13th, 2008 at 07:44:27 PM MST (User Info)

Yes the yellow thing is more like the bottom one Had all three made today....got a couple of brief 6mph gust...just a glimpse that it might work.   I think it's too large going to shorten the rods so it will be 30inches from 36inches estimated about 120 rpm (no load) ....need more research ( that's spelled more wind) they so seem to work well....but maybe not good enough...fun nevertheless (about 8 cups coffee later) ( :>) Norm [ Parent ]

prop shape needs to be flat on windward side? | 24 comments (24 topical, 0 editorial)

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