Standard Cirrus C-Hook

As the "other poster" the main thing I was saying was to comply with the
design Tech Note which would mean not going to a non-standard bearing size
or specification. As for "used parts" it depends on whether you can be
sure that they were the correct parts in the first place and what has
happened to them since new.

John Galloway



At 12:37 23 September 2008, JJ Sinclair wrote:
Hmmmm,
All 3 of the birds I have in the barn are 19mm, you may have a problem
in getting SH to come up with what was an early change to the design.
I'll take a look at the elevator side to see how much of a hassle it
would be to change both sides of the hook-up.

Another poster said you shouldn't consider "used parts". My response
would be; What do you think a 39 year old sailplane is, if not a
collection of used parts flying in close formation?
JJ

Randy wrote:
The bearing size for my original C-Hook is approximately 14.15mm.
The newer/larger bearing size is 19.00mm

Randy


On Sep 20, 7:42=EF=BF=BDam, JJ Sinclair wrote:
Chris,
What size do you need in mm ?
JJ

Mines a collection of ABused spare parts flying in generally tight formation.
For what it is worth my 1970 Std Cirrus has the smaller (14.15mm?) "C" hook, and I replaced it via the agent with no
problem last year. The reason for replacement was wear - abrasion of the hook from all the dust over 38 years.

Serial number #57 - I think they changed the size when they went to the "B" fuselage on serial number 158.

Bruce

JJ Sinclair wrote:
Hmmmm,
All 3 of the birds I have in the barn are 19mm, you may have a problem
in getting SH to come up with what was an early change to the design.
I'll take a look at the elevator side to see how much of a hassle it
would be to change both sides of the hook-up.

Another poster said you shouldn't consider "used parts". My response
would be; What do you think a 39 year old sailplane is, if not a
collection of used parts flying in close formation?
JJ

Randy wrote:
The bearing size for my original C-Hook is approximately 14.15mm.
The newer/larger bearing size is 19.00mm

Randy


On Sep 20, 7:42�am, JJ Sinclair wrote:
Chris,
What size do you need in mm ?
JJ

Randy,
It will take some glass work to swap out both sides of your elevator
drive, ie change early SH 14.15mm connections to later SH 19mm drive
mechanisms. As with any "used parts", they must be inspected by a
qualified person to determine damage, wear and corrosion. These parts
have been stored in my barn for about 20 years, ever sence their
rather spectacular 'last flight'. You could change to a "used"
elevator with 19mm drive, but that would be over-kill to solve a
rather simple problem. The C-hook is nothing more than a 10mm bolt
with the "C" fitting welded on top of it. Recommend you take both new
and old fittings to a good machine shop and have them cut the C
portion off both and then weld the new 10mm bolt section onto the old
14.15 C-hook. Before removing the C-hook from your Cirrus, be sure to
measure the exact distance from the top of the push-rod to the bottom
of the C in the C-hook. When installing the new part, screw it in
until the distance is exactly the same. Then tighten the jam-nut and
check the elevator throw against the FM/MM.
Have fun,
JJ

Randy wrote:
The bearing size for my original C-Hook is approximately 14.15mm.
The newer/larger bearing size is 19.00mm

Randy


On Sep 20, 7:42�am, JJ Sinclair wrote:
Chris,
What size do you need in mm ?
JJ