REFLECTOR: Enhanced photos Cozy Loss of Catto Prop

[michalk]

They are working.
http://www.tvbf.org/gallery/index.php?display=Cozy%20Cato%20Prop%20Loss%20Enhanced%20Photos%2FProp%20Ext%20CU.bmp

It's kind of strange the first time someone accesses them.  That's when 
the system re-sizes them.

Yes, those BMP's are huge.

Jim Agnew wrote:
> I posted them to the gallery and all I got were thumbnails I don't know 
> why I didn't get the full pictures.  I had to upload them as BMP since 
> that was the only usable format I could get the pictures from the 
> original note pictures.
>  
> Jim
>  
> James F. Agnew
> Jim_Agnew_2 at Yahoo.Com
> Tampa, FL
> Velocity 173 Elite Aircraft Completed & Flying
> 
> 
> ----- Original Message ----
> From: michalk <michalk at awpi.com>
> To: Jim Agnew <Jim_Agnew_2 at yahoo.com>; Velocity Aircraft Owners and 
> Builders list <reflector at tvbf.org>
> Sent: Wednesday, December 20, 2006 3:36:01 PM
> Subject: Re: REFLECTOR: Enhanced photos Cozy Loss of Catto Prop
> 
> Post them to the gallery?
> 
> Jim Agnew wrote:
>  >  
>  > I just received the following note from Craig Cato and I'm posting it
>  > since it contains some important information.
>  >  
>  > I took five of the Cozy pictures and enhanced them increasing their
>  > sharpness and contrast, the failure mode is clearly visible.  The center
>  > flange looks like it is threaded as do the drive studs and one stud (the
>  > one opposite the last bolt) looks like the prop was moving almost 1/4".  
>  > Sam DaSilva looked at the original pictures and we were speculating the
>  > the prop finally departed the one remaining bolt and was slung away by
>  > the remaining bolt which caused the bending of the bolt attachment stud.
>  >  
>  > I can't attach the 5 pictures due to their 1.5MB each size so if anyone
>  > has a way to post them let me know.
>  >  
>  > Jim
>  >  
>  >
>  > ----- Forwarded Message ----
>  > From: Craig Catto <cattoprops at cdepot.net>
>  > To: Jim Agnew <Jim_Agnew_2 at yahoo.com>
>  > Sent: Wednesday, December 20, 2006 11:57:00 AM
>  > Subject: RE: Enhanced photos
>  >
>  > Jim,
>  > OH my gosh!!!.. thanks for the pics!,,  
>  > One thing sticks way out to me, and have seen spinner failures due to
>  > this and other props that have worked due to this. From what I see, it
>  > looks like there is fabric imprinting on the face of the extension.  IF
>  > a composite spinner bulkhead was used, I have high suspicions this was a
>  > culprit.  I do not recommend a composite bulkhead ever be used
>  > in-between the power transfer surfaces, extension to propeller.  I have
>  > also seen painted aluminum bulkheads on many installations that have
>  > shown signs of working and do not recommend that the aluminum area of
>  > power transfer be painted in any fashion.
>  >  
>  > The problem is the resin in a spinner bulkhead and or paint on a
>  > aluminum bulkhead usually will not handle the heat associated with this
>  > power transfer if there ever becomes any small movement.  Like rubbing
>  > your hands together, friction, amplify this by thousands in frequency
>  > and the heat generated in a very short period of time will break down
>  > the resin and or paint  in the area of power transfer.  Once this
>  > happens, you now have a lubricant in-between the extension and
>  > propeller, and the inevitable will happen. With the composite bulkheads,
>  > once heat reaches a point it will flow ever so slightly causing a
>  > dramatic reduction in bolt torque!
>  >  
>  > I have not talked with Zeitlin or seen the article of this incident yet,
>  > only pictures sent to me from Jim Agnew. These pictures of the fabric
>  > imprint of the possible use of a composite bulkhead raised loud alarms
>  > to me.  If anyone is using this type of spinner bulkhead, I do not
>  > recommend it be used.  I personally have seen to many of them that have
>  > shown signs of working and causing torque values to reduce. And
>  > recommend on a aluminum bulkhead that the paint be removed in the 7"
>  > diameter area of power transfer.
>  > On the composite bulkheads, you can either replace it with an aluminum
>  > one, or cut out the inner area and rivet on an aluminum circular plate.
>  >  
>  > Jim, if you could please post this immediately I would sure 
> appreciate it.
>  > Regards,
>  > Craig Catto
>  >  
>  >  
>  >  
>  >  
>  >  
>  > -----Original Message-----
>  > *From:* Jim Agnew [mailto:jim_agnew_2 at yahoo.com]
>  > *Sent:* Wednesday, December 20, 2006 8:09 AM
>  > *To:* Craig Catto
>  > *Subject:* Enhanced photos
>  >
>  >     Hi Craig, I enhanced 5 key photos so you can see them better.
>  >      
>  >     Jim
>  >      
>  >     James F. Agnew
>  >     Jim_Agnew_2 at Yahoo.Com
>  >     Tampa, FL
>  >     Velocity 173 Elite Aircraft Completed & Flying
>  >
>  >
>  >
>  >
>  >
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