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Shaking strut ...

 
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Noel



Joined: 13 Jan 2006
Posts: 21
Location: Montreal, Qc, Canada

PostPosted: Sat Apr 15, 2006 10:43 am    Post subject: Shaking strut ... Reply with quote

Hello all !

I have often noticed some vibration of the wing struts of my Twinstar MK II .
This happens at a given RPM when the strut seems to hit a "resonance" point and start to vibrate. This never bothered me too much as it seems to only happens at a RPM of around 4500 .

Now ... i took some picture with my camera phone while flying yesterday
that happens to "catch " these vibrations on the picture.
I have been quite surprised when i saw that picture with the apparently quite large amplitude of the vibration ! Quite amazing ... but it could also be
an optical "effect" created or amplified by the relatively low shutter speed of the camera ...

In any case i am now thinking of installing wing strut fairings to try tio fix the "problem" .

I have seen some modular plastic fairing that can easily be installed on a Rans S-12 (i think) ... These are made of 2 plastic parts that "snap" together to form a "water drop" shaped fairing ...

Any one could submit a source for these ?

Good and safle flying to all ...

Noel Bouchard
Twinstar MK II
350 Hrs


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ShakingStrut.jpg
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Vibration in a Twinstart MKII wing strut
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ShakingStrut.jpg


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Blumax008(at)aol.com
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PostPosted: Sat Apr 15, 2006 10:58 am    Post subject: Shaking strut ... Reply with quote

In a message dated 4/15/2006 2:44:16 PM Eastern Standard Time,
noel(at)teledata.qc.ca writes:

In any case i am now thinking of installing wing strut fairings to try tio
fix the "problem" .

My '04 and 503 powered Firestar II does the same thing depending on how the
503 feels like eating it's oats. I have the strut fairings too...same deal. I
let the sumbitch vibrate. If the strut fails, I got the 'chute.

Wild Bill Catalina


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Bob Dalton



Joined: 09 Jan 2006
Posts: 68
Location: Manteca, Ca

PostPosted: Sat Apr 15, 2006 12:37 pm    Post subject: Shaking strut ... Reply with quote

Noel,

Look's as though the strut is distorted from your lexan being photographed
through, you do have a canopy on right. Look at the landscape you will see
your straight lines are distorted also. Just my guess though.

Bob D.
Do not archive

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Bob Dalton
Manteca, Ca.
wiserguy@comcast.net
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