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  #1  
Old 06-12-2012, 04:36 PM
Kato's 8 Kato's 8 is offline
 
Join Date: Jan 2011
Location: Carl Junction, MO
Posts: 136
Default canopy attachment in aft frame area

Hello all!
I hate to bring up another canopy question and certainly dont want to start another rivit/screw,glue debate but.....
I had called Vans and asked about the aft end of the canopy just past the "no rivit" area and how I'm unsure of the fit there. It seems to require significant pressure both in and downward to get it against the steel in that region. It does clamp down though. Is that normal? The tech guy said he didnt even rivit the last 6-7 inches on his -4. Im qite nervous about drilling that area and then riviting or screwing it down only to release the clamps and watching it expolde!
Can anyone comment on this some?
2nd question is: Should I use riv-nuts or just tap and screw in (assuming I go the screw it down method? Ive read some posts where those who have used them would not use them again.
Thanks a bunch!
Bill
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  #2  
Old 06-13-2012, 08:26 PM
Transporter Transporter is offline
 
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Location: Lee's Summit, MO
Posts: 741
Default Aft Canopy Fit

Bill,
I'm not sure from your post whether you've made "the big cut" to separate the windscreen from the slider.

Once this is done the slider portion is much easier to work with and in my case, the aft fit was good without a lot of clamping pressure needed once the cut was made.

Obviously, the aft portion of the frame must sit properly on the fuselage in relation to the slider track for the best fit. A small change in the aft "hoop" position vertically will change the canopy-to-frame fit quite a bit. The plans give the dimension and I made a small block/spacer to fit between the track and the frame to keep the frame from drooping while working on the canopy.

Hope this helps,
Mike
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RV8 SB, Engine hung...working on cowl and canopy
VAF#1067, EAA Chapter 91
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  #3  
Old 06-14-2012, 05:24 AM
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jthocker jthocker is offline
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Join Date: Jan 2005
Location: Cincinnati, Ohio
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Default

Bill,
I've done a bunch of RV8 canopy's now. I've found, that after you have the canopy front windscreen portion trimmed, and the whole canopy sitting down on the windscreen bow, I make the "Big Cut".
Then I remove the canopy frame and set it on a bench. Then I begin clamping the canopy from the AFT end and work,my way fwd. This way puts way less stress on the canopy as you clamp it. The lower front edge of the canopy also "grows" fwd as you clamp. I just re-trim the "Big Cut" here. I used to do it the opposite way (clamping at the fwd side and moving aft), and found the situation you describe. Trust me on this one. The aft skins also seem to fit a lot better with the "new" way.
Just an additional tip on getting a good "aft skin" fit, The skins will nest/fit pretty well in the cockpit area. Drill and clecoe them there, then get a helper to pull the aft part around the aft canopy, and also exert some forward pressure on the skirt. You will see the gaps with the turtle deck disappear. You drill while your helper maintains pressure on the skirt.
Good luck!
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  #4  
Old 06-14-2012, 08:38 AM
Kato's 8 Kato's 8 is offline
 
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Location: Carl Junction, MO
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Default

Thanks for the kind responses. I failed to mention that I did have the windscreen separated from the slider and am now fitting the bubble to the frame. I was trying different ways to clamp this down and found just as Jon said that it goes easier starting aft and working forward. I too seem to have more of a front lip than original but it can be final sanded. I also need to get up to chapter 91 to see if I can visit with those folks. Thanks Mike!
Im thinking Ill try drilling this and riviting as per plans. Ive seen where Dan kings new bubble is being done with holes drilled open to 1/4 inch and then 1/4" od tube installed to protect and help center the screw or rivit. Any additional thought on this or tips would be appreciated.
Does anyone know if the "todds" canopy fits better on theaft area sides? Mine has probably 3/4 inch on each side in that no rivit zone. Seems like alot to me.
Bill
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  #5  
Old 06-14-2012, 09:05 AM
Transporter Transporter is offline
 
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Location: Lee's Summit, MO
Posts: 741
Default Todd's Fit

I started with Van's and switched to Todd's. Both fit about the same in the front part of the slider, but the Todd's fit better in the aft portion.

I had about 1/8" to 1/4" gap with the Todd's. Perfect gap for Sikaflex in most places and minimal clamping pressure required against my spacers.

Having said that, the Todd's is thicker...so if I'd been using screws it would have taken a lot of pressure to squeeze it inboard in the aft end.

Best,
Mike
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  #6  
Old 06-14-2012, 05:10 PM
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jthocker jthocker is offline
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It's always frustrating to take the time to give a very qualified response to a post that asks for some help, and then have it second guessed by someone working on their first project. The standard Van's canopy and frame fit Freaking perfectly!!!!!!!! Not only have I done 4 of my own, I've assisted on 4 others locally. There is NO misfit of a standard Van's canopy and frame!!
The Todd's canopy may fit as well but it doesn't fit Better!
Excuse me for sounding harsh, but I've been at a baseball game today and I've been drinking!
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  #7  
Old 06-14-2012, 06:34 PM
Transporter Transporter is offline
 
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Location: Lee's Summit, MO
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Default On Second Guessing

Jon,
I switched to Todd's because of a crack in my Van's...long story, but I've fitted both brands and my experience is as stated above.

No one was "second guessing" your response; just tried to answer the question about relative fit.

Best,
Mike
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RV hitchhiker
RV8 SB, Engine hung...working on cowl and canopy
VAF#1067, EAA Chapter 91
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  #8  
Old 06-14-2012, 06:40 PM
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jthocker jthocker is offline
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Talking

Sorry Mike!
A lot like "drunk" dialing, maybe someone should take away my iPad when I've had a few!
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Jon Thocker
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http://www.teamaerodynamix.com/

"Badger"

Upgrade your RV from "Steam" to "Glass"
http://www.redlinethegoal.com
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  #9  
Old 06-14-2012, 07:45 PM
Transporter Transporter is offline
 
Join Date: Jun 2007
Location: Lee's Summit, MO
Posts: 741
Default Moderator Plug

Jon,
No worries-and I'll throw in a plug for you and the other moderators on VAF:

You guys do a great job-please keep up the good work.

Thanks,
Mike
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RV hitchhiker
RV8 SB, Engine hung...working on cowl and canopy
VAF#1067, EAA Chapter 91
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  #10  
Old 06-14-2012, 08:15 PM
clam clam is offline
 
Join Date: Oct 2005
Location: Lakeland, TN
Posts: 118
Default mine too, Bill

Bill,
I am experiencing a similar problem to your description. Wish I had heard of Mutha's aft end first technique before I went the plans route. Anyway, my canopy appears that it would have fit very well had I not adjusted the aft end of the frame for the slider clearance. As mentioned in an earlier post, the little bit of adjustment in the frame now leaves a 1/8" to almost a 1/4" gap between the canopy and frame when solidly clamped all the way around. I plan to throw some Sika adhesive around that rear portion to seal it up and press on. Maybe my next RV-8 will be perfect.
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