REFLECTOR: main gear pivot bolts

[Joe Ramsey]

Main bolts on the XL-5's are 5/8" * 10".

On 2/8/07, Scott Derrick <scott at tnstaafl.net> wrote:
>
>  No, I think the old ones were 3/8 and the new ones 1/2 inch..
>
> Scott
>
> Mike Dawson wrote:
>
> I thought Velocity went to 5/8 bolts and the old ones
> were 1/2 inch?
>
> Mike
> --- Scott Baker <sbakr at comcast.net> <sbakr at comcast.net> wrote:
>
>    Most of the Grade-8 bolts that Velocity receives
> from suppliers are not
> perfectly straight.  I've noticed a bend in the
> bolts with enough sweep to
> cause friction inside the steel main gear leg insert
> bushing.  The friction
> is such that a very light tapping with a hammer
> easily pushes it through the
> bushing.  This may or may not speak to what you
> describe.
> I have notice that most of the main gear bolts seen
> in the Velocity Service
> Center require a hammer and punch to remove.  This
> leads me to believe that
> small bends in the main gear bolts are common place.
> SB
>
>
> ----- Original Message -----
> From: "Scott Derrick" <scott at tnstaafl.net> <scott at tnstaafl.net>
> To: "Velocity Aircraft Owners and Builders list"<reflector at tvbf.org> <reflector at tvbf.org>
> Sent: Thursday, February 08, 2007 10:44 AM
> Subject: REFLECTOR: main gear pivot bolts
>
>
>
>
>  I pulled my main gear off yesterday and was
>
>  disappointed that the 1/2"
>
>  pivot bolts were slightly bent.  I only have a
>
>  couple hundred hours on
>
>  this set of  bolts and I don't think I'm that bad
>
>  of a pilot when it
>
>  comes to landing the thing.  Maybe its all a
>
>  matter of perspective
>
>  though. :-)
>
> The bolts weren't bent a whole lot, and came out
>
>  with light persuasion
>
>  from a rubber mallet, but they are bent enough
>
>  that I don't want to
>
>  re-use them. The gear also retracted fine prior to
>
>  removal which is my
>
>  usual test to verify all is well as the clearance
>
>  is fairly close for
>
>  the legs and wheels up in the wings. A leg with a
>
>  really bent bolt won't
>
>  retract or will bind somewhere, ask me how I know!
>
> I realize a redesign of this part of the system
>
>  would be a lot of work,
>
>  but every A&P that I have shown this pivot bolt
>
>  system too has not liked
>
>  it. Its a lot of bending forces on a long bolt
>
>  that is not supported in
>
>  the middle very well. Maybe the fix is to use a
>
>  thicker sleeve in the
>
>  leg to provide more support in the middle which is
>
>  where the bolt always
>
>  bends? Or possibly a better(stiffer) alloy steel
>
>  for the sleeve?
>
>  Anybody else with hundreds of hours on there V
>
>  that has had to R&R the
>
>  main gear experience what I am?   Bolts always
>
>  just a little bent?
>
>  Scott
>
> --
>
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>
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>
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>
>     Mike Godwin, Electronic Frontier Foundation
>
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>
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