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« Last post by Brock on February 19, 2026, 07:44:04 AM »
I see in SystemThree's info that T-88 bonds to Aluminum.
Seems, I've also seen posts and pictures where folks have said they've bondend their (seemingly painted) wing & strut mounts with T-88. So the question is, if you embeded your Strut & Root Fittings in T-88 did you remove the paint first and properly clean the metal?
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It is my understanding that vinylester resin is good for auto fuel with ethanol. Epoxy resin is good for av-gas, but does not hold up as well when used with auto fuel and ethanol.
Chuck in Indiana, what fuel do you use?
I was using 100LL but had a sticking valve problem. Shortly after, Verner said to only use automotive fuel for that reason, so I've been running mogas with alcohol. Of course, I have an aluminum tank  so it's a non issue for me.
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« Last post by GTS225 on February 17, 2026, 04:32:29 AM »
Weighing all the cookies make me wonder if the effort was worth it. Slightly over a pound for all of them.
A pound off the wings spars is a pound on a required spring or cable clevis. Roger
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« Last post by Kamcoman77 on February 16, 2026, 07:26:09 PM »
On the no glue situation, it should be easy to get the edge of a putty knife or chisel under the middle of the vertical. The plywood should bow a little. Squirt epoxy underneath, let it soak for a couple of minutes, and remove the "pry bar". Wipe off the excess epoxy and dance around the build table three times.
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« Last post by Brock on February 16, 2026, 06:51:42 PM »
After cleaning up and putting away the cookie-cutter, next on the todo list was to run all four spars through the table saw. Main spars got a 10 deg cut and the Rear spars got a plywood trim. This was a step where I felt things could go really wrong. But with care it was all mostly simple.
Folding ladders make good table saw 'rollers'. With the help of ratchet straps they can be adjusted to any height.
Finally, I found a spot where the glue was missed. Haven't decided yet if it needs to but cut out and replaced or if it is possible to glue it without removal. What do you think?
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« Last post by Brock on February 16, 2026, 06:43:45 PM »
Making good progress. Today I got out the cookie cutter and lightened the spars a bit. I put like spars back to back and drilled them both at the same time. Used a 'backer board' to keep the holes clean. stappled inside of each hole to be cut so that both holes would stay lined up and the cookies would come out together.
Weighing all the cookies make me wonder if the effort was worth it. Slightly over a pound for all of them.
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« Last post by Kamcoman77 on February 16, 2026, 10:37:00 AM »
Great point about VE. That is also my understanding. My tank interior is covered with two coats of vinyl-ester resin and a VE resin/flox mix to fillet all the inside corners. I did not cover the inside with FG cloth since the Divinycell foam is very strong and only needed an outside layer of FG. Since the tank was already sealed, I used epoxy on the exterior because I had some laminating resin from a boat project. I found epoxy more forgiving when applying the FG cloth because of a more predictable working time.
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« Last post by Tom H on February 16, 2026, 10:15:32 AM »
It is my understanding that vinylester resin is good for auto fuel with ethanol. Epoxy resin is good for av-gas, but does not hold up as well when used with auto fuel and ethanol.
Chuck in Indiana, what fuel do you use?
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« Last post by Kamcoman77 on February 15, 2026, 07:30:00 PM »
In your video you showed some plain weave fiberglass cloth. I had difficulty getting it to fit around the rounded corners of my Divinycell/FG tank. I found that the Rutan 7725 bi-directional weave cloth from Aircraft Spruce worked much better. Something to think about.
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« Last post by Shay King on February 15, 2026, 01:28:54 AM »
Thanks guys.
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