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corbob13
Joined: 02 Apr 2008
Posts: 18
Location: Pulaski, WI
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 Posted: Fri Aug 22, 2008 10:00 am Post subject: Fuel tank shake |
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Guys,
I have a question regarding the shaking of the fuel tank/instrument panel in my model II. If it weren't for the fact it made my compass drift unreliable I wouldn't care about it. The problem is that through all phases of flight I have a really low frequency shake that has just enough amplitude so that my compass won't settle on a heading.
Has anyone else had this problem? Any ideas?
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Cory
N903DB
Kitfox Model II, Rotax 582 |
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matronics(at)bob.brennan.
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| Posted: Fri Aug 22, 2008 4:48 pm Post subject: Fuel tank shake |
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What prop? Possibly unbalanced?? How are the engine mounts? The panel
mounts?
Bob Brennan - N717GB
1991 UK Model 2 ELSA Kitfox
Rotax 582 with 3 blade prop
Wrightsville Pa
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kitfox555(at)sbcglobal.ne
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| Posted: Fri Aug 22, 2008 7:20 pm Post subject: Fuel tank shake |
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You know I had this happen to me and the problem was one of the props was out a couple of degrees. I would check each prop for pitch and 1/8 alignment try to make all same rpms should be about 6200-6250 static, try let us know Jerry
corbob13 <corbob13(at)netnet.net> wrote: [quote]--> Kitfox-List message posted by: "corbob13"
Guys,
I have a question regarding the shaking of the fuel tank/instrument panel in my model II. If it weren't for the fact it made my compass drift unreliable I wouldn't care about it. The problem is that through all phases of flight I have a really low frequency shake that has just enough amplitude so that my compass won't settle on a heading.
Has anyone else had this problem? Any ideas?
--------
Cory
N903DB
Kitfox Model II, Rotax [quote][b]
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corbob13
Joined: 02 Apr 2008
Posts: 18
Location: Pulaski, WI
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| Posted: Tue Aug 26, 2008 9:34 am Post subject: Re: Fuel tank shake |
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I finally got out flying and looked things over before flight. I had accumulated quite a few bugs on the prop and cleaned them off, thinking they could have been a contributor; no luck. The engine mounts seem fine and I don't think it would be panel mounts since the entire tank shakes a bit, not just the panel (the compass is mounted on top of the panel/tank not in the panel). It's not the prop setting since I have a two blade fixed pitch wood prop, 68x36. It could be a balance issue, I can have that checked next week when it goes in for annual. I also have a PXP 71x37 prop that came with the plane that I wanted to try, maybe this is my excuse to change it.
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Cory
N903DB
Kitfox Model II, Rotax 582 |
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propellerdesign(at)tele2.
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| Posted: Tue Aug 26, 2008 10:39 am Post subject: Fuel tank shake |
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How do you leave the propeller when hangared?
Jan
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lcfitt(at)sbcglobal.net
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| Posted: Tue Aug 26, 2008 11:28 am Post subject: Fuel tank shake |
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Cory,
I am definitely not an expert on this, but I think the prop might just be
the problem. There have been numerous posts on the list regarding the
smoothness of the three bladed prop vs. the two blade. I just had a
conversation with a friend this morning that mentioned that the Rans LSA
product has a two blade prop and the customers don't like it and it is
hurting sales. For them, as I understand it, it is more of a performance
issue, but in a certified LSA once the design is certified, that's it - no
changing out the props.
Lowell
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corbob13
Joined: 02 Apr 2008
Posts: 18
Location: Pulaski, WI
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| Posted: Tue Aug 26, 2008 6:39 pm Post subject: Re: Fuel tank shake |
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It sounds like other suspect the prop, which does seem most likely. Jan, I think I see where you're getting with your question, and to be honest I leave it where ever it stops. Before I bought the plane it sat unused for a while, and the prop may have been in a horizontal orientation (if I understand where you're headed). I'll follow up if I find a solution. Thanks again.
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Cory
N903DB
Kitfox Model II, Rotax 582 |
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propellerdesign(at)tele2.
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| Posted: Tue Aug 26, 2008 9:53 pm Post subject: Fuel tank shake |
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Cory
You are on something, I've seen it before and it really make a difference
where you leave the 2 bladed wooden prop, it can be other factors though.
Also, a wooden fixed pitch prop can have different angles on both blades if
poorly made.
A 3 bladed is said to be smoother on some engines, but how to store it
horizontal? put the plane on the nose in hangar? 
Jan
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