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Old 30-07-2015, 09:28   #1
Guy
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wood props

Photos of wood props. Sorry if this whole topic has gotten out of control. As an aviation professional and having quite a few hours flying behind wooden props, it is a bit offensive to be doubted by arm chair pilots who are too lazy to actually find out what they are spouting off about.
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Old 30-07-2015, 10:30   #2
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Re: wood props

What a strange post.

Neat props, though!
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Old 30-07-2015, 10:38   #3
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Re: wood props

I have no idea what this thread is about but here is a contribution.

Steve

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Old 30-07-2015, 10:55   #4
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Re: wood props

It's good you posted that. No one would believe you if there was no picture.
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Old 30-07-2015, 17:20   #5
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Re: wood props

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Originally Posted by chris95040 View Post
What a strange post.

Neat props, though!
Again, I'm sorry for the thread drift but the post," sailing with your trans in gear" had gotten out of wack.
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Old 30-07-2015, 17:29   #6
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Re: wood props

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Again, I'm sorry for the thread drift but the post," sailing with your trans in gear" had gotten out of wack.
Only if you let it get to you Guy. My Hurth gets locked in reverse when I sail. My bank account, my choice. DGAShit what anyone else does.
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Old 30-07-2015, 17:50   #7
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Re: wood props

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Only if you let it get to you Guy. My Hurth gets locked in reverse when I sail. My bank account, my choice. DGAShit what anyone else does.
So you are another person who does not read the posts. I am not saying anything about putting a boat in gear. What's with you guys?
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Old 30-07-2015, 18:04   #8
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Re: wood props

I think that two cylinders of the four were misfiring so they cut a blade off
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Old 30-07-2015, 18:06   #9
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Re: wood props

the reason it was misfiring was it had the wrong weight of oil
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Old 30-07-2015, 18:21   #10
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Re: wood props

Quote:
Originally Posted by Guy View Post
Photos of wood props. Sorry if this whole topic has gotten out of control. As an aviation professional and having quite a few hours flying behind wooden props, it is a bit offensive to be doubted by arm chair pilots who are too lazy to actually find out what they are spouting off about.
Nice pictures of a working two bladed fixed pitch laminated woden prop, a couple of four bladed antique wooden props and a very nice one three bladed decorative prop.
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Old 30-07-2015, 18:25   #11
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Re: wood props

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I think that two cylinders of the four were misfiring so they cut a blade off
LOL...

However the real reason that one blade is truncated as I'm sure Guy knows is that is the most efficent prop design especially for low horsepower fixed pitch propsĺ.
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Old 30-07-2015, 18:53   #12
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Re: wood props

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LOL...

However the real reason that one blade is truncated as I'm sure Guy knows is that is the most efficent prop design especially for low horsepower fixed pitch propsĺ.

Have they ever tried this with a boat? Rpm and horsepower ( 40hp I think) are about the same. Torque on a boat would be higher because of the transmission. That must be the reason you would need 2 blades.
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Old 30-07-2015, 19:04   #13
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Re: wood props

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Have they ever tried this with a boat? Rpm and horsepower ( 40hp I think) are about the same. Torque on a boat would be higher because of the transmission. That must be the reason you would need 2 blades.
I really don't know but I would start the guessing game around fluid dynamics of air verus water and the incompressibility of water. But really its only WAG.

I should add that my post 11 comment was referring only to light aircaft props!
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Old 30-07-2015, 19:31   #14
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Re: wood props

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Originally Posted by sartorst View Post
the reason it was misfiring was it had the wrong weight of oil
Looks like an early set up for a machine gun behind the prop.
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Old 30-07-2015, 20:18   #15
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Re: wood props

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very nice one three bladed decorative prop.

Go to Oshkosh sometime. Big time EAA fly-in in the US. Plenty of 3 bladed wood props on homebuilts.. It's not that big of a deal. Everything is glued and laminated together in the middle. That said, I don't think there are any FAA certified 3 bladed wood fixed pitch props. The FAA and the prop makers are not up to the burdens of getting something certified for so few planes. Getting a prop certified is a very big deal and there would be no money in it. So it's pretty much 2 bladed fixed pitch certified wood props these days. Very smooth, almost no vibration.
There are a bunch of variable pitch props with maybe 2,3,4 or even 5 wooden blades. Of course there is a metal hub with these, most are FAA certified.
I should add again, these are all laminated, Ash is popular.
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