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Darn canoes!

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I stopped in at my mechanic's garage this morning to arrange an oil and filter change for later this week. Joe's what you might call a "country mechanic", in the sense that he's a licensed car mechanic but without any of the expensive computer diagnostic equipment in most modern shops these days. For that reason he does most maintenance and repairs but not all. And also he's as likely to have some unusual vehicles in his shop as a regular 'ol car. I've seen vintage automobiles and lawnmowers, farm pickups and luxury cars. He did a nice job on his own late model Winnebago, bought in Ohio and driven back here for a total rebuild; for his own family trips. He swapped out the old 4 cylinder for a complete 6 cylinder drivetrain overhaul. "She handles hills real nice now. We can take it on the Cabot Trail, and she just purrs on those hills."
But on this day the shop was nearly empty, save for another personal project of his. Sitting off to the side on home made welded up pivoting stands (so he can work on all sides without much bother) were two airplane wings. He loves his Stinson. "It's 68 years old this year!" He gave me a full tour of the job. I inspected the fabric and coatings (airplane "dope") and had the procedures all explained to me. He said he'd saved about $10k doing the re-skin job himself. He also showed me the old skin, and where the butyl dope coat cracked from the prop wash over the years. "I laid it on too thick, but it looked real nice for about 12 years." I noticed a patch on a section of old skin and asked how you went about repairing these things in the case of minor accidents. (My mind wandered a little here, as I was thinking of skin on frame canoes and kayaks, and even cedar canvas canoes as I lightly drummed on the taut wing fabric with my fingers.) He moaned at the question of repairs, and seeing that patch he shook his head.
"I was tied up to the dock last summer, up at our cottage. Nice and secure. Along comes my...brrrother-in-law (he pronounced this with heavy regret) in his darned canoe. He ties up next to me, and wants to unload his darn canoe onto the dock. As he's tossing his junk outta the darn canoe he picks up a paddle, and loses his balance. My wing is hanging over him and the dock, see." (I think I see what's coming.) And then comes the pantomime. I tried not to laugh when Joe acted out the whole unbalanced standing in canoe shimmy dance, followed by the paddle stab to an overhead airplane wing "RRRIIP!". I assumed he was going for the dramatic and not the comedic, but it was hard to tell, so I frowned and moaned along with him. He sighed and said it would be all good as new by the time the lakes opened up. But I just had to ask "So, does your brother-in-law still have his canoe?" Joe just dead-panned me and changed the subject "So Brad, let's say Friday morning, 8 o'clock?"
 
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That sparked a memory. Friend of mine's uncle had a '49 Stinson back in the late '70's. He invited the two of us to go for a flight out over the southwest Idaho desert. I had never seen a SOF airplane in person before walking up to it on the tarmac. I almost turned around right there, but my twenty something pride and bravado put me in that plane. That was one of the funnest rides of my life. After checking our fear factor, the uncle commenced to doing some stunt maneuvers that literally made our '70's long hair stand on end. It was a gas, and made me forget about the thoughts of tearing fabric until after it was over. Beautiful old plane, that was.
 
Thinking back on it now, I can appreciate the love and care these pilots must have for an old SOF aircraft like that. They are as much a work of art as any wood/canvass canoe.
 
That aircraft dacron scares me. If a paddle can go through it, I don't know if I want to be in the air with it. I've got some fabric samples for a skin on frame and even 9 oz seems crazy thin. Probably why I'll and up with the heaviest SOF ever made. It's hard to trust anything but the 26 oz.

And that sounds like the type of guy that says "darn". Dag nabbit
 
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He's a mild mannered fella who rarely swears, much less raise his voice. But boy can he talk. Mind you, I guess I encourage him sometimes. He can spin a yarn, and I do like a good story. He didn't fill me in on his brother-in-law's canoe. Not yet anyway, but there'll be plenty of more visits to my mechanic if my luck with motor vehicles has anything to do with this. That polyester fabric is a real tight weave, and it's held on with two coats of nitrocellulose dope and screws and washers. Incredibly explosive flammable stuff. He then heats the skin to 250 degrees F for just the right tension and shrinkage. He explained the need for leeway for expansion and contraction as well as aging. Blah blah blah. We talked about fasteners and laying on extra strips of adhesive skin and dope. When I pointed to the inspection stamps he started explaining about safety regulations and a 50% rule regarding structural integrity, G-forces, fuel delivery, air intake and bypass from the muffler to the carburetor to fight icing more blah blah blah. Before I knew it an hour had passed. But it had been an enjoyable and instructive morning. Actually we were interrupted. His shop door opened and closed and an older couple walked in. I said my see ya laters and headed for the door. The elderly gentleman entered the garage, doffed his cap, and another discussion began. I passed the lady sitting comfortably in the office. We exchanged greetings and smiles. She looked like she was prepared to be there awhile.
 
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That aircraft dacron scares me. If a paddle can go through it, I don't know if I want to be in the air with it. I've got some fabric samples for a skin on frame and even 9 oz seems crazy thin. Probably why I'll and up with the heaviest SOF ever made. It's hard to trust anything but the 26 oz.

And that sounds like the type of guy that says "darn". Dag nabbit
I suspect the dope degraded the fabric. I have had three dacron skinnned canoes for about 20 years each and they were all using 3.3 oz ceconite. Its quite hard to slash through with a knife.
I know that butyl dope was not used on them. Aircraft used to be covered in canvas, which I think the above was as checkering was mentioned. Ceconite doesnt checker paint nor mud layer.

http://www.boatdesign.net/forums/boat-design/beautiful-skeleton-37456-3.html
 
No, it wasn't canvas. It was polyester. The checkered problem was a too thick application of butyl dope. Joe explained how the prop wash at ultra sonic speeds from prop tips put extreme pressure on the leading edge of wings caused cracking. He insisted it was cosmetically ugly but no great danger. The guy is a fuss-pot after all. And he is fussy about safety. The doped fabric is really tough stuff. Even uncoated I tried to tear/stretch it. On the bias I could move it a little, but with the "thread grain" I might as well have been pulling on plywood. He must've really poked that wing hard with that paddle, and I doubt it was much of a tear. Once the dopes are dried and heat treated they're repellant to moisture, even gas etc. He needs solvent to strip the aluminum skeleton down.
When I'm back there on Friday I'll ask him what exactly the fabric is called and what weight. I might even try my own poke test on the old stuff, though I won't have a paddle handy.
He last re-skinned his plane 18 years ago. I remember being there for that too. He had his entire plane laid out all over his big shop; the fuselage too. At that time he was really nervous to have me anywhere near his project. I understand. This time too I kept a respectful distance.
 
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Well told. I like this cat already. Joe, the mechanic. I'd like to see him flying. Maybe the story continues in the air once he gets it all back together. Shuttle bunny!
 
Oh geeze, I gotta give a final chapter to this darn canoe story. It seems aircraft and canoes have at least one thing in common.
I got my oil change okay, but seeing as how I like to talk, and he likes to talk, well my 20 minute oil/filter/lube job took well over an hour. I asked about the fabric he covers his plane with. He dug out a parts catalogue the size of a telephone book. https://www.aircraftspruce.ca/menus/st/catalog.html There he showed me the stuff he uses. 3.4 oz /sq.yd? Heavy duty. Here it is. I wonder if you can cover a canoe in it?

P4171666.JPG

Anyway, there I was picking out all the stuff I'd need to build my very own plane and Joe says "Not so fast. You can't just patch together your own plane just like that. Mine's a certified aircraft. There's all kinds of materials and methods that must meet FAA approval." Hearing the word patch jogged my memory, and so I asked "Do you carry an emergency repair kit with you?" (Thinking of canoes again). He says "Weeelllll, in this instance no. But I made do with a handy repair kit everyone should have on every trip."
And then he pulled out a roll of duct tape.
 
Yes you can! My old town OTCA has had a ceconite skin for about eight years and it drastically reduced the weight. I bought my first batch of fabric from Tom Mckenzie a long time ago. After that it all came from Aircraft Spruce. I thinks I've done four or five boats with it.
Jim
 
zee problem with zee ceconite is zat it telegraphs all hull imperfections. If you didn't fill in all your countersunk tacks or didn't fair the hull perfectly every bump shows.
Ceconite does not absorb bumps while tripping ( it is hard to tear, but there is no cushion. The rock energy force trransmits to the plank) but its quite a bit lighter. That boat in the pic is a Loon Works boat from 1996. No checkering. Tom sorta was not planning on no checkering .. when asked he'd just shrug.
 
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