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  #1  
Old 04-01-2020, 05:18 AM
chris mitchell chris mitchell is offline
 
Join Date: Jul 2006
Location: near Harrogate, England
Posts: 385
Default Canopy locking mechanisms

Hi All,

I wanted to change my canopy lock on my RV-4 canopy frame/skirts etc from the Vans supplied method which means you "pull back to lock" shut for flight to one that is forward to lock - previous experience has always been "forward to lock" and I would like to be consistent about it. Maybe not the biggest deal but its just something that concerns me.

I have worked out how I would use a quadrant attached to the handle to change the requisite angles of the locking rods that slide through the canopy frames and lock into the fuselage structure forward and aft. The back one will work fine using the existing hole in the canopy frame. The front one is more of a problem because of the angle it is now working at -i e it runs down at about 30-40 degrees if I want to get it locking the frame near the base. If I run it straight across it will be locking the frame about 8 inches above the base and at about 30 degrees off its travel in a horizontal plane, because of the curvature of the canopy base and skirt.

I know some others have also rebuilt this mechanism to a "forward to lock" system, so I'm interested to see how you did it. Any information will be useful - ts something for me to work on while locked down from the Coronavirus.

Many thanks

Chris
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  #2  
Old 04-01-2020, 06:07 AM
Skysailor Skysailor is offline
 
Join Date: May 2011
Location: Atlanta, GA
Posts: 227
Default

I'll shoot you a picture of mine later today. Forward to lock definitely seems more natural to me.
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  #3  
Old 04-01-2020, 07:07 AM
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Larry DeCamp Larry DeCamp is offline
 
Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 964
Default A picture of the dilemma would be helpful

If I understand the challenge, it is the steep angle the front rod approaches the instrument panel.One thing to consider is mounting a bullet shaped rod in a guide tube at the panel that is driven by the forward rod with a clevis type connection. This will allow automatic alignment both laterally and vertically as the forward rod moves through its arc, but the bullet stays square and centered with the hole in the panel.
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  #4  
Old 04-01-2020, 07:49 AM
fixnflyguy fixnflyguy is offline
 
Join Date: Jan 2006
Location: Winston-Salem, N.C.
Posts: 1,138
Default My thoughts..

A lot of RV-4's have that conversion, but I built mine "per plans" with the Pull to Lock scenario. I also have the additional safety catch provided by VAN's. Its nearly impossible to loose the canopy, and requires a concerted effort to open against the springs . I recently flew an RV-4 back from Fla. for a friend that had the reversed Push-to-latch set-up, with no secondary safety latch. I was so nervous about it, I attached a short bungee I took along from the knob to the underside of the panel preventing me from blowing the canopy by accident. The forward lock also puts another "round ball" in the region of the throttle, something that in a busy cockpit could be pulled aft during decent...bye bye canopy...I embrace the original design(with safety latch), even know its opposite of the natural thought process.
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  #5  
Old 04-02-2020, 01:08 AM
chris mitchell chris mitchell is offline
 
Join Date: Jul 2006
Location: near Harrogate, England
Posts: 385
Default

Thanks for replies.

I don't want to do anything complicated; I take the point about the extra lock and the proximity of levers with balls on the end! Nevertheless, having to install a second lock because of the insecurity of the first seems counter-intuitive.

I'll sit and stare at it a while longer. I hadn't thought of the locking rod ina a guide tube articulated with a clevis. I quite like that.

Skysailor (or indeed anyone else who has made this change) - love to see a photo if you have time.

At least I have plenty of time to think about this and enact any change. going nowhere quickly.

Chris
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Chris Mitchell

Repeat offender;
RV-8, QB, built, flown 150 hours, sold;
RV-4 - attempted repair, rebuild and remediation - abandoned and junked ;
RV-4 fuselage and wing kits - both at QB stage;
2015-2018 dues paid!
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  #6  
Old 04-02-2020, 04:30 AM
fixnflyguy fixnflyguy is offline
 
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Location: Winston-Salem, N.C.
Posts: 1,138
Default The second lock..

Chris,
I would post pictures, but my computer firewall does not allow photo sharing links, so in short, the original design is not insufficient per say, as it has a spring that helps keep the latch rods engaged. The secondary safety latch is a very simple little blade hook that utilizes the existing pivot, and drops in a small slot on the Longeron cap. In the event you failed to pull the lock lever back, the secondary safety latch would be engaged . Only full forward travel of the lever would disengage that...complicated but simple!
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  #7  
Old 04-02-2020, 05:51 AM
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Larry DeCamp Larry DeCamp is offline
 
Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 964
Default Accidental release

Chris, the comment about bumping the knob if it is locked forward is a valid concern. My system is toggled over center in the locked position so any force to withdraw the bullet from the panel only intensifies the locking geometry. That said, a bump from shoulder or elbow vertically is a negative concern.

I would appreciate ideas for a “backup” latch function that does what the bungee cord did, yet is elegantly simple and functional.
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RV-3B flying w/7:1 0320 / carb / Pmags / Catto 3b / digital steam
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  #8  
Old 04-02-2020, 08:49 AM
FinnFlyer FinnFlyer is offline
 
Join Date: Aug 2018
Location: Bell, FL
Posts: 292
Default

If you do this you can have a taxi position hole in the instrument panel an inch or two above the normal lock hole.

https://drive.google.com/open?id=1mB...iQRdM-_7wu1naK
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  #9  
Old 04-02-2020, 09:16 AM
yarddart yarddart is offline
 
Join Date: Jun 2006
Posts: 130
Default Canopy latch

Canopy latch either direction works for me I'd be curious to see what the safety lock looks like
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  #10  
Old 04-02-2020, 11:35 AM
fixnflyguy fixnflyguy is offline
 
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Location: Winston-Salem, N.C.
Posts: 1,138
Default Safety Latch on VANs webstore

The safety latch is a stardard VANs part and the install is on my drawings.Its sold on their website as RV-4 Canopy Safety Latch" Bag 951" for a whopping $15.60. Small, simple and effective. Its standard in kits after about 1990.
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