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craig(at)craigandjean.com
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 Posted: Thu May 01, 2008 3:41 pm Post subject: Fix for canopies which tilt too far forward |
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With my XL QBK I followed the 6-C-03A photo guide and aligned the lip of the
bubble 190mm back from the firewall rivet line. Once I got to the point of
actually being able to tilt the canopy up I found that the forward lip of
the canopy (even without the rubber trim) extends below the level of the
front skin. In other words if my cowling was installed the lip of the canopy
would hit it.
The best way to fix this problem is to prevent it - test-fit the bubble,
frame and gas springs before drilling and bolting the pivots on the
longerons for the gas springs (6C2-2). That isn't an option on a QBK because
the pivots come already positioned, drilled and bolted.
There are at least three possible fixes:
- shorten the hardened rods on the gas spring and cut more threads with a
die.
- shorten the gas springs overall by trimming the aluminum eyelets that
thread onto the ends of the actual spring. Lance Gingell did this but he
only had to shorten his my 6mm:
http://lancegingell.com/planebuild/constructionlog.asp?PlanRef=6-C-3&Search=
PlanRef
http://wls1.lancegingell.com/largeplaneimages/DSC06003.jpg
- move the pivots farther aft.
I wanted to move my pivots aft but would have to move them so far that I
wouldn't be able to pick up the existing, most forward bolts. And I didn't
want to drill more holes in the longerons. Another builder found himself in
the same situation and persuaded the factory to weld up a pair of 6C2-2 with
longer plates. I did the same and asked for parts with an extra 30mm on both
ends for a total length of 240mm instead of the 180mm part the plans
describe. This should be more than enough, I need to move mine back about
13mm.
Relatively uninteresting picture attached.
-- Craig
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ashleyw(at)gvtc.com
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| Posted: Thu May 01, 2008 5:31 pm Post subject: Fix for canopies which tilt too far forward |
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I had to same problem.
The theory of measure twice cut once does not work if you measure from the
wrong spot-twice.
I shortened the gas struts.
Canopy does not open as for but there is no problem getting in or out of the
plane.
Floyd Wilkes
601 XL O-200
Almost finished.
---
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Tim Juhl
Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan
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| Posted: Fri May 02, 2008 9:25 am Post subject: Re: Fix for canopies which tilt too far forward |
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Looking at 6C2 (7/05) the distance that the mounting bolt on 6C2-2 is 290 mm back from the mounting bolt on 6B6-4. If I read your comments correctly then the distance that would prevent the canopy from contacting the cowling would be 303 mm, correct?
BTW - I really appreciate this kind of information. You certainly help smooth the process out....
Tim
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_________________
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CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
Almost done! It'll fly in spring! |
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craig(at)craigandjean.com
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| Posted: Fri May 02, 2008 10:04 am Post subject: Fix for canopies which tilt too far forward |
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On my plane, yes. But the bigger point is that it is probably different on
each plane. That is why (if possible) that I recommend drilling and bolting
6C2-2 last - after you have built and fitted the whole canopy.
-- Craig
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