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jason(at)hills.org
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 Posted: Mon Apr 04, 2011 12:01 pm Post subject: Metal prop? |
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Does anyone have a metal prop on at TR-1?
I'm considering a prop change in the next year or so. I'm hoping to get more efficiency and not worry as much about rain damage. At a minimum I'll likely change to a different pitch wood prop. Since my engine overhaul 2 years ago I can push 2800+ rpm at any altitude. It'd be nice to get a bit more cruise.
..Jason
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ftyoder(at)yoderbuilt.com
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| Posted: Mon Apr 04, 2011 1:24 pm Post subject: Metal prop? |
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What engine? About 4 years ago Sensenich was doing vibration tests on one
for the Cont. IO-240. I don't know if is for sale, you might check with
them.
Tim
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jason(at)hills.org
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| Posted: Mon Apr 04, 2011 2:04 pm Post subject: Metal prop? |
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Lyc O-290-D2
..Jason
On Apr 4, 2011, at 2:21 PM, "F. Tim Yoder" <ftyoder(at)yoderbuilt.com> wrote:
[quote]
What engine? About 4 years ago Sensenich was doing vibration tests on one for the Cont. IO-240. I don't know if is for sale, you might check with them.
Tim
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sstearns2(at)yahoo.com
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| Posted: Mon Apr 04, 2011 2:53 pm Post subject: Metal prop? |
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One thing to think about is that propellers of the same diameter and pitch will be different from different companies. Everyone has their own way of filling in the details.
Personally there is no way I would get a metal fixed pitch prop. I went with a prince composite prop. A metal prop will be significantly heavier so I'd check the effect on your CG before you buy.
Also, you will have metal prop and engine combination with unknown fatigue characteristics. Wood/composite propelers have much better fatigue characteristics. It's worth noting that metal propellers are not allowed in formula one air racing due metal fatigue and in flight failures of metal propellers.
The one advantage of a metal prop is that the pitch can be changed (you don't want to watch them repitch it though).
I think running 2800 rpm wide open in cruise is perfect.
If your going to spend money on a new prop then it's worth at least concidering a constant speed prop if your engine is set up for it. I'm on the fence for my airplane. I think you can get a used/rebuilt prop and governer for about $6,000 and it weighs about 50 pounds. There are lighter constant speed props out there but they are $10-12,000, but maybe you can find one used.
Anyhow, hope this was helpful...
Scott
--- On Mon, 4/4/11, F. Tim Yoder <ftyoder(at)yoderbuilt.com> wrote:
From: F. Tim Yoder <ftyoder(at)yoderbuilt.com>
Subject: Re: Metal prop?
To: kis-list(at)matronics.com
Date: Monday, April 4, 2011, 2:21 PM
What engine? About 4 years ago Sensenich was doing vibration tests on one for the Cont. IO-240. I don't know if is for sale, you might check with them
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