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Rowland_Carson
Joined: 04 Jul 2008
Posts: 155
Location: Cheltenham, England
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 Posted: Fri Oct 10, 2008 2:05 pm Post subject: pitch torque tube attachments |
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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
--
| Rowland Carson LAA #16532 http://home.clara.net/rowil/aviation/
| 1130 hours building Europa #435 G-ROWI e-mail <rowil(at)clara.net>
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budyerly(at)msn.com
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| Posted: Fri Oct 10, 2008 2:24 pm Post subject: pitch torque tube attachments |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> 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
[quote] ---
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Rowland_Carson
Joined: 04 Jul 2008
Posts: 155
Location: Cheltenham, England
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| Posted: Sun Oct 12, 2008 2:42 pm Post subject: pitch torque tube attachments |
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At 2008-10-10 18:23 -0400 ALAN YERLY wrote:
| Quote: | 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
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At 2008-10-11 10:28 +0100 G-IANI wrote:
| Quote: | From what I have seen they all vary slightly. If you think about it the
trunnion is a piece of steel plate welded to the tube at right angles. It
is almost impossible to get the two sides to stay exactly parallel and the
correct distance apart. Even when carefully jigged into position the
thermal stress from the welding will make them move slightly as they cool
down
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Bud, Ian - thanks for your reassurance that my common sense is stil
functioning!
regards
Rowland
--
| Rowland Carson LAA #16532 http://home.clara.net/rowil/aviation/
| 1140 hours building Europa #435 G-ROWI e-mail <rowil(at)clara.net>
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
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