Max Johansson
Joined: 09 Jan 2006
Posts: 25
Location: Helsinki, Finland
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 Posted: Wed May 21, 2008 4:19 am Post subject: Gas springs on 701 bubble doors - force and geometry |
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Hello Craig, Jeff, Ron, Stan, Steve and Terry
The drawing 7-F0-7CZ-1 calls out the gas spring as:
(1ZC) PAR 156 AG2 40 lb (2 req'd)
with the gas spring fastened with A4 rivets (four for the fuselage
pivot bracket and and two for the bubble door frame pivot bracket.
The actual part delivered was made by the Spanish company PERIN
(see www perinspa.com) as the 18 kg version in their "PNEUS" line
of 3-18 kg max thrust pneumatic springs, all with 15 mm diameter.
So what is needed is a 40 lb force gas spring with a min 200 mm
stroke because the distance between the pivot points is 150 mm
with the door closed and 330 mm with the door horizontal, from
which angle the door can still move somewhat upwards.
Unfortunately the drawing 7-F0-7CZ lacks most dimensions, but
the lower pivot point is situated 320 mm down from the underside
of the 7F12-1 fuselage frame tube. The door frame pivot point is
situated approximately 100 mm out from the door piano hinge.
When doing actual measurements on the CZAW delivered airframe
the lower pivot point was situated 310 mm down from the underside
of the said fuselage frame tube and the door pivot point was
situated 95 mm out from the door piano hinge when the door
was held horizontal.
When the door piano hinge line is used as a reference and the door
frame is held horizontal the pivot points are situated as follows:
Door pivot point is 30 mm under the level of the piano hinge level
and the frame pivot point is 260 mm under the piano hinge level.
The enclosed picture is better than a thousand words...
best regards
Max
<<gas-spring.jpg>>
msg ends
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_________________
Max
Max Johansson, Helsinki, Finland
Building a CH701SP-912S
on CZAW amphibian floats |
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