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  #11  
Old 07-16-2020, 09:50 AM
FinnFlyer FinnFlyer is offline
 
Join Date: Aug 2018
Location: Bell, FL
Posts: 465
Default No inserts

If you have the patience (doesn't take all that long with a 1/8" dremel bit), don't oversize the holes.

Expansion/contraction is mainly fore-aft.

Pick a stationary reference point. Then gradually increase the holes to a slot, bigger and bigger slots the further away from the reference point.

Example from my RV-4:
Alum: 12
Acrylic: 38
Diff: 26 micro inch/F
Elongate Slot width Elongate Slot width Ref temp Min temp Max temp
Position inches 160 80 -10 150
2.60E-05 Inch Inch mm mm More aft More forward
3 0.012 0.137 0.3 3.5 1.9 1.6
6 0.025 0.150 0.6 3.8 2.0 1.8
9 0.037 0.162 1.0 4.1 2.2 1.9
12 0.050 0.175 1.3 4.4 2.4 2.1
15 0.062 0.187 1.6 4.8 2.5 2.2
18 0.075 0.200 1.9 5.1 2.7 2.4
21 0.087 0.212 2.2 5.4 2.9 2.5
24 0.100 0.225 2.5 5.7 3.0 2.7
27 0.112 0.237 2.9 6.0 3.2 2.8
30 0.125 0.250 3.2 6.3 3.4 3.0
33 0.137 0.262 3.5 6.7 3.6 3.1
36 0.150 0.275 3.8 7.0 3.7 3.3
39 0.162 0.287 4.1 7.3 3.9 3.4
42 0.175 0.300 4.4 7.6 4.1 3.6
45 0.187 0.312 4.8 7.9 4.2 3.7
48 0.200 0.325 5.1 8.2 4.4 3.8
51 0.212 0.337 5.4 8.6 4.6 4.0
54 0.225 0.350 5.7 8.9 4.7 4.1
57 0.237 0.362 6.0 9.2 4.9 4.3
60 0.250 0.375 6.3 9.5 5.1 4.4
63 0.262 0.387 6.7 9.8 5.2 4.6
66 0.275 0.400 7.0 10.1 5.4 4.7
69 0.287 0.412 7.3 10.5 5.6 4.9
72 0.300 0.425 7.6 10.8 5.8 5.0
75 0.312 0.437 7.9 11.1 5.9 5.2
78 0.324 0.449 8.2 11.4 6.1 5.3
81 0.337 0.462 8.6 11.7 6.3 5.5
84 0.349 0.474 8.9 12.1 6.4 5.6

I can e-mail you the spreadsheet if you want.

Oh, and I found it easy to countersink the plexi for the dimpled side skins. Just slide the 1/8" microstop countersink back and forth in the slots.

Finn
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Last edited by FinnFlyer : 07-16-2020 at 09:55 AM.
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  #12  
Old 07-16-2020, 01:52 PM
JoopSJ's Avatar
JoopSJ JoopSJ is offline
 
Join Date: Dec 2016
Location: The Netherlands
Posts: 78
Default

Quote:
Originally Posted by mfleming View Post
...

PS: I'm also thinking of Sikaflex but want to thoroughly explore all techniques before deciding.
Hi Michael,
I just finished glueing the canopy with SIKA.
It is very easy and clean and I canít imagine going the route of holes, screws and Rivets.
B.t.w. Did we meet in 2017 during the Vans factory tour?
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Empennage, Wings, Fuse .. Done
Working on Finishing and FWF
Donation 2017. . . 2020
Chairman NVAV (EAA chapter 664 - Dutch experimental aircrafts builders)
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Member AOPA
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  #13  
Old 07-16-2020, 06:58 PM
F1Boss's Avatar
F1Boss F1Boss is offline
 
Join Date: Aug 2006
Location: Taylor Texas
Posts: 835
Default No sweat: Bennair; Dunnatt

We have been using the oversize hole process on the Rocket canopies since 1994 or so. Many aircraft used that exact process too.

Drill the hole to match 1/4Ē OD fuel line, and cut the line to match the thickness of the plexi. Use tinnerrman washers and #6 screws to hold things in place - donít tighten the screws totally. If need be, you can use a slightly longer piece of tubing as a shim if the plexi does not quite lay down on the tubing

Donít use the attach screws to force the plexi to conform to the tubing if the plexi does not quite follow the tubing shape (under 1/16Ē or so), or as it was with clecoes.

Drill the plexi with a step-drill on low RPM.

Build up your normal fiberglass fairing between the windshield and slider, and along the aft & side skirts.

Use household exterior caulk of your color choice to waterproof the slider plexi along the side and aft fairings; attach with the suggested fasteners. Before final assy, lay a length of masking tape along the metal fairings to keep the caulk off of the exterior
Plexi.

Do not use silicon caulk - just the inexpensive water based stuff.

The caulk is amazing regarding how long it lasts. Never did hear of anything coming loose.

I have never heard of a Rocket canopy cracking when this process is used.
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Mark

"Not everyone needs a Rocket. Some folks, however, shouldn't live life without one.
You know who you are."
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  #14  
Old 07-16-2020, 08:57 PM
mfleming's Avatar
mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 628
Default

Quote:
Originally Posted by JoopSJ View Post
Hi Michael,
I just finished glueing the canopy with SIKA.
It is very easy and clean and I canít imagine going the route of holes, screws and Rivets.
B.t.w. Did we meet in 2017 during the Vans factory tour?
YES... I remember meeting at Vanís... glad to see you are building....good luck.
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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017
Started on QB fuselage 01/2018
Sliding canopy mostly completed 10/2020
Wiring in progress
Donated for 2021 and so should you
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  #15  
Old 07-17-2020, 09:43 AM
PhatRV PhatRV is offline
 
Join Date: Mar 2018
Location: Buena Park, California
Posts: 393
Default

I would like to request pictures of this grommet technique. I read Danny King post but the pictures on tinypic are no longer there.

Thanks.
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RV8 standard build: Empennage 99% completed
Wing -- Closed
Fuselage -- Canopy Done. Fiberglass 80%
Avionics Installation -- 90%
Firewall Forward -- Prep for cowl install
Electrical -- 90%

Donation paid through 2021
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