> Pietenpol-List: proper prop for A-75 piet > >

[matronics]

Original Posted By: "Peter W Johnson"
> Subject: Pietenpol-List: proper prop for A-75 piet > > Hey guys, > > I have become a lurker, but, I need some feedback from you guys on props. I > have a prop off of a 65hp Aeronica mounted to my A-75 piet. I'm developing > 2300-2400 rpm's. I was curious what others are using with their piets with > A-75's and what kind of number they're getting. I was visiting with Jim > Markle and he dug this up for me: Max,I also have an A-75, with a Hegy 72 x 42 wood prop. At 10' above MSL on a hotday I get 2150 static, 2200 on a cool day. Climbout at 50 mph & 2200 rpm, anda 2150 rpm cruise yields 70-72 mph (depending on load, etc)Top speed is 85-88 @ 2400 rpm. With this prop it's essentially an A-65 with alittle over-rev potential, as you've pointed out, so I fly it like an A-65. Alsoset the timing as an A-65 since that's the rpm range it runs in. I would like to improve the rate of climb, and I agree with your comments on metalvs. wood, but the cost of a prop to gain slightly more climb just doesn'tpass the cost/benefit analysis, and the Hegy is SO pretty..........Cleaning bugs off my prop in Panacea.......Dave MordecaiPanacea, FL> Subject: Pietenpol-List: proper prop for A-75 piet > >Hey guys, > > I have become a lurker, but, I need some feedbackfrom you guys on props. I > have a prop off of a 65hp Aeronica mountedto my A-75 piet. I'm developing > 2300-2400 rpm's. I was curious what othersare using with their piets with > A-75's and what kind of numberthey're getting. I was visiting with Jim > Markle and he dug this up forme: Max, I also have an A-75, with a Hegy 72 x 42 wood prop.  At 10' above MSLon a hot day I get 2150 static, 2200 on a cool day.  Climbout at 50 mph& 2200 rpm, and a 2150 rpm cruise yields 70-72 mph (depending on load, etc)Top speed is 85-88 @ 2400 rpm.  With this prop it's essentially an A-65with a little over-rev potential, as you've pointed out, so I fly it like anA-65.  Also set the timing as an A-65 since that's the rpm range it runsin.  I would like to improve the rate of climb, and I agree with your commentson metal vs. wood, but the cost of a prop to gain slightly more climb just doesn'tpass the cost/benefit analysis, and the Hegy is SO pretty.......... Cleaning bugs off my prop in Panacea.......Dave MordecaiPanacea, FL  ________________________________________________________________________________

[matronics]

Original Posted By: owner-pietenpol-list-server(at)matronics.com
John,I left the bell crank location where it is on the plans and installed acouple of pulleys attached to the top longeron to change the routing of theup elevator control cables. They now do not have any contact with theelevator when in the down position.CheersPeterWonthaggi, AustraliaHYPERLINK "http://www.cpc-world.com/"http://www.cp ... --Original Message-----