Rowland,
You are right. If the metal arms are slightly wide, adjust with washers
as appropriate and if necessary, go to the next larger bolt to ensure
shank coverage and washer the nut to tighten appropriately. As you
surmised, common sense rules. Always buy extra bolts with slightly
larger or shorter lengths for just these occasions. My life revolves
around "the book calls for an AN3-10 but a 3-11 works better" questions
in the shop.
Happy building,
Bud Yerly
Custom Flight Creations
US Europa Dealer
(813) 653-4989
----- Original Message -----
From: Rowland & Wilma Carson<mailto:rowil@clara.net>
To: Europa e-mail list<mailto:europa-list@matronics.com>
Sent: Friday, October 10, 2008 4:12 PM
Subject: Europa-List: pitch torque tube attachments
<rowil@clara.net<mailto:rowil@clara.net>>
Well, here it is Friday afternoon, Europa factory tech support has
knocked off for the weekend and so naturally I have a tech query!
I'm about the set up the CS10 transverse pitch torque tube to get the
CS09 mountings in the right place. I have assembled the pitch
pushrods CS11 to the trunnions on the CS10 but I am puzzled by the
fastener callouts.
Using the combination of washers in the manual (AN960-516L each side
of rod-end bearing) means that there is slight gap between the
bearing and the trunnions and so the trunnions would be pulled
together slightly when the nut is tightened.
On the starboard trunnion, either changing to AN960-516 each side, or
using 2 off AN960-516L each side would remove the gap. (Adding that
extra thickness in the washer stack means that the AN960-516 under
the bolt head has to be removed in order to get shank rather than
thread in the other trunnion hole.)
The centre and port trunnions need one AN960-516 (or 2 off
AN960-516L) plus one AN960-516L for nil gap.
Did anyone else find that the CS10 trunnions were too far apart for
the specifed washer stack? Is my CS10 an odd one? Or is it maybe
right that the trunnions should be permanently stressed by being
pulled together?
If no-one can suggest why not, I intend to use enough washers to
allow the nut to be done up without causing any bending stress in the
trunnions.
regards
Rowland
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