Brodhead Pietenpol Association

Original Posted By: Michael D Cuy

Original Posted By: "DJ Vegh"
Subject: Re: Pietenpol-List: dihedral vs. speedWalt, I'm seeing speeds very similar to Mike C., with my A65 and homebuilt 72 X 42 prop. The next time I have to pull the prop, I'll probably rework it a little bit to get more RPM, for a better take-off and climb. I'm still very intrigued with the Scimitar Prop, and hope to build one some day, using Eric Clutton's guide. Full power level flight, my adjusted tach reading is 2200 RPM.The A65 is rated at 2300 RPM. I have errors in my tach reading, as well as myASI, and have adjusted these errors to conclude the speeds. I've done a few flight tests with the GPS, but neglected to put the results in my log...oh well...guess I'll have to go do the tests again. Hey, theres a good reason togo fly !! As far as your increased speed with the dihedral, I'm betting you had some washout rigged into your original configuration, and don't have washout inthe re-rigged dihedral wing. The penalty for washout, is drag. The hershy barplanform of the Pietenpol wing does Not need washout, because it naturally stalls inboard first. That said, I think I saw somewhere that BHP did put a tiny little bit of washout in the wing, probably just to err on the side of washout.Chuck G.NX770CG________________________________________________________________________________

Original Posted By: Rcaprd(at)aol.com
i rigged my wings with .2=B0 of washout I'll be curious to see how she stalls.DJ (just sprayed the tail feathers with polyspray) Veghwww.imagedv.com/aircamperN74DVMesa, AZ ----- Original Message -----

Original Posted By: Rcaprd(at)aol.com
My speeds are about the same as Mike and Chuck.Also I have a one piece wing with 1 1/2" dihedral at tips. It flys very stable.Dick ----- Original Message -----

Original Posted By: owner-pietenpol-list-server(at)matronics.com
Hello DickAny trick to putting dihedral in a one-piece wing?Ken in Austin, slowly putting the turtledeck together _____

Original Posted By: "John and Phyllis Smoyer"

Original Posted By: Ken Chambers
No real trick. I built a table, 30 ft long. As I recall it was only about 18"+/-wide. I made sue it was level and ran a string line to verify a straightedge and found center and raised the tips 1 1/2'. I scarfed the joint about 18"and put 24"x1/8" ply plates over both sides of the splice. After building the first spar I built the second on top of the first, to make surethey came out the same.Dick ----- Original Message -----