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johngoodman
Joined: 18 Sep 2006
Posts: 530
Location: GA
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 Posted: Wed Jun 20, 2018 11:52 am Post subject: Spinner Cracks |
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We are doing our condition inspection and found some very faint cracks around the bolts that pass through the backplate, S 602B. In fact they are so faint, that we had to clean off the primer and do a fingernail test. Anybody else had this?
John
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#40572 Phase One complete in 2011 |
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Lew Gallagher
Joined: 04 Jan 2008
Posts: 402
Location: Greenville , SC
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| Posted: Wed Jun 20, 2018 1:35 pm Post subject: Re: Spinner Cracks |
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Hey John,
Curious, are the cracks in the fiberglass of the spinner or the aluminum backing plate. Pics?
- Lew
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NOW OFICIALLY BUILDER #40549
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johngoodman
Joined: 18 Sep 2006
Posts: 530
Location: GA
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| Posted: Wed Jun 20, 2018 2:50 pm Post subject: Re: Spinner Cracks |
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The fiberglass is fine - it's the aluminum backing plate.
John
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Lew Gallagher
Joined: 04 Jan 2008
Posts: 402
Location: Greenville , SC
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| Posted: Wed Jun 20, 2018 4:31 pm Post subject: Spinner Cracks |
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I haven't seen that, but since it's the aluminum, I would suspect
vibration/out of balance. Obviously, replace the plate. But before you do,
maybe slowly run it up while feeling the dash for vibration? Get someone to
electronically balance your prop on the plane to check it out after it's
been replaced? We've got a guy in our EAA chapter here in Greenville, SC
that gives a group rate for balancing if several want to do it at one
sitting.
Before mounting the spinner, I put it on a record turntable and it checked
out very true.
Keep posting your research results.
Later, - Lew
--
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Fly off completed ! |
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robskinner(at)sbcglobal.n
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| Posted: Thu Jun 21, 2018 3:24 am Post subject: Spinner Cracks |
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Could be that the bolt holes were not de-burred correctly and micro cracks turned into something more!
Sent from my Robert's iPad
| Quote: | On Jun 20, 2018, at 2:52 PM, johngoodman <johngoodman(at)earthlink.net> wrote:
We are doing our condition inspection and found some very faint cracks around the bolts that pass through the backplate, S 602B. In fact they are so faint, that we had to clean off the primer and do a fingernail test. Anybody else had this?
John
--------
#40572 Phase One complete in 2011
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=481042#481042
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johngoodman
Joined: 18 Sep 2006
Posts: 530
Location: GA
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| Posted: Fri Jun 22, 2018 8:02 am Post subject: Re: Spinner Cracks |
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As requested, I took some photos today. We also pulled the assembly and found cracks at every bolt - on both sides. I've ordered new parts, but it's obvious that it was just a matter of time. I will attach one sample photo, they all look pretty much the same.
John
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Lew Gallagher
Joined: 04 Jan 2008
Posts: 402
Location: Greenville , SC
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| Posted: Tue Jun 26, 2018 1:41 pm Post subject: Re: Spinner Cracks |
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Hey John, thanks for the picture. Will definitely put this on the list for next inspection.
Later, Lew
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Fly off completed ! |
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