Van's Air Force
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Canopy Doghouse to Slider Seal
- Thread starter ten4teg
- Start date
Drawing 42 makes mention of the lanyard. See view G-G. I rigged mine using a piece of nylon covered fishing leader and crimps. Getting the length right was a little tricky, but the leader material is cheap.
Dave
Fiberwire
Being an orthopaedic surgeon, I used some wasted suture material called Fiberwire. It is a braided suture material that is increddibly strong. We use it for rotator cuff repairs and anterior cruciate ligament repairs. So probably a braided fishing leader would also work.
Bill Near
-7A flying
Being an orthopaedic surgeon, I used some wasted suture material called Fiberwire. It is a braided suture material that is increddibly strong. We use it for rotator cuff repairs and anterior cruciate ligament repairs. So probably a braided fishing leader would also work.
Bill Near
-7A flying
jimski9
Member
I'm an ENT surgeon. Our suture materials are not strong enough for aircraft use 
There was an elegant way of attaching the slider block posted in the RVator 2008 issue 6 on page 13.
This uses a thin stainless steel strip.
http://www.vansaircraft.com/RVator/2008/6-2008-RVator.pdf
I did mine this way and it works well
Jim Talbot
RV7A ZK-JLT 30 hours now
New Zealand
There was an elegant way of attaching the slider block posted in the RVator 2008 issue 6 on page 13.
This uses a thin stainless steel strip.
http://www.vansaircraft.com/RVator/2008/6-2008-RVator.pdf
I did mine this way and it works well
Jim Talbot
RV7A ZK-JLT 30 hours now
New Zealand
I'd really like to have more info about the Lanyard. nothing but pointing to where it terminates. what is it to do for you, where does the other end go? and that drawing you speak up looks like a "hook" of some sort behind the slider block. NOTHING in the text that I can find about it. Sorry. Newby to the building on an RV. jim
Desert Rat
Well Known Member
10 year old thread so none of the original guys may reply.
Basically, the turbulent airflow in that area is blowing forward. Like a pickup truck on the highway with the back window open. The doghouse covers the slider track but since the track is T shaped, no matter how well you get the doghouse to fit, the open areas under the cross bar of the T are going to be open for a draft of air to blow forward into the aft cockpit.
The idea is for the white delrin block to sit on the track and do a better job of plugging up that hole. Because the canopy skirt pops up when open the block cant just be attached to the skirt. When you open the canopy, the aft frame slide pushes the block aft with it, and the lanyard is to pull it back into position when you close that canopy again.
Here's a picture of mine when I was working on the skirts. Fiberglass skirt, but the same idea as the aluminum doghouse. I'm still under construction and don't have a lanyard installed yet but without it, when I open the canopy, it pushes that block aft on the slider track where it would just stay forever because there's nothing to pull its back forward when you close the canopy.
The lanyard is just a piece of fishing line/fine wire/whatever works with one end attach to the block and the other end attached to the canopy frame to pull it back forward with the canopy.
Yeah, that drawing sucks. The thing you're interpreting as a hook it just meant to show a loose line.
Basically, the turbulent airflow in that area is blowing forward. Like a pickup truck on the highway with the back window open. The doghouse covers the slider track but since the track is T shaped, no matter how well you get the doghouse to fit, the open areas under the cross bar of the T are going to be open for a draft of air to blow forward into the aft cockpit.
The idea is for the white delrin block to sit on the track and do a better job of plugging up that hole. Because the canopy skirt pops up when open the block cant just be attached to the skirt. When you open the canopy, the aft frame slide pushes the block aft with it, and the lanyard is to pull it back into position when you close that canopy again.
Here's a picture of mine when I was working on the skirts. Fiberglass skirt, but the same idea as the aluminum doghouse. I'm still under construction and don't have a lanyard installed yet but without it, when I open the canopy, it pushes that block aft on the slider track where it would just stay forever because there's nothing to pull its back forward when you close the canopy.
The lanyard is just a piece of fishing line/fine wire/whatever works with one end attach to the block and the other end attached to the canopy frame to pull it back forward with the canopy.
Yeah, that drawing sucks. The thing you're interpreting as a hook it just meant to show a loose line.
Attachments
I have some pictures of my installation here. I recall it took several tries to get the lanyard to be just the right length, but it actually works pretty well with my molded fiberglass rear skirts. One piece of advice, it's easier to install from outside the fuselage - tie one end to the slider block, then reach up and thread the other end around the attachment for the C-661 slide block. (Edit: I recall I used a slip knot somewhere in there to make it less difficult to tie)
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