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occom
Joined: 26 Aug 2006
Posts: 404
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 Posted: Thu Sep 02, 2010 2:33 am Post subject: Propeller question |
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All this propeller talk is appropriate timing for me, I have a 68" taper tip
warp on a 3:1 C box on my 582. I was amazed at how much pitch I had to put
in to keep it from overspeeding. I get what I measure to be 14.5 deg. am I
measuring incorrectly or is this about right. Is there a table somewhere of
what to expect when you do this?
It was amazing to watch the egt's drop as I homed in my target RPM. Now
measuring just short of 1000 on a very hot day.
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Guy Buchanan
Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA
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| Posted: Thu Sep 02, 2010 9:10 am Post subject: Propeller question |
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At 03:27 AM 9/2/2010, you wrote:
| Quote: | I was amazed at how much pitch I had to put in to keep it from
overspeeding. I get what I measure to be 14.5 deg. am I measuring
incorrectly or is this about right. Is there a table somewhere of
what to expect when you do this?
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Well, it is what it is, right? That's the beauty of ground
adjustable. I run about 12 1/2 degrees on a 70" for a similar
configuration, but the pitch will vary considerably depending on your
weight, drag, density altitude, jetting, disposition, and just about
anything else you can think of. That's why you won't find any tables
or other "useful" information.
Guy Buchanan
San Diego, CA
K-IV 1200 / 582-C / Warp / 500 hrs. and counting
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_________________
Guy Buchanan
Deceased K-IV 1200
A glider pilot too. |
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Thu Sep 02, 2010 11:21 am Post subject: Re: Propeller question |
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Guy is absolutely right. Don't ever worry about your actual numbers on pitch angle. Just worry about rpm, temps and performance that you want. Each prop will will be different from different Mfg's. Your plane's flight characteristics from Mfg to Mfg will make it slightly different , too. So set it where your WOT should be, watch your temps because prop pitch will make a difference and the outside make up of your plane will factor into all this as far as proper pitch for the prop.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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