Honda CBR 600cc 10x6 Aluminum Airboat Build

Airboats with smaller powerplants.
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Deano
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Re: Honda CBR 600cc 10x6 Aluminum Airboat Build

Postby Deano » Sun Oct 22, 2017 9:05 am

Just a couple passing comments that I hope will help.

First off in my opinion, Russ' comments about steel vs. aluminum is that not only are his observations correct; but correct to
such a magnitude and extent, that I wouldn't miss a beat by considering the other. Realistically, anything you use will be very close to the same weight in the end, largely because of the need to increase the thickness of the aluminum to offset its lack of strength that Russ eluded to. From a budget standpoint, steel is very difficult to beat when that is part of the consideration.

While it is true that aluminum will last longer in a salt environment and give less grief over time in that situation, the build you propose does not look like it's going to spend a lot of time offshore. :D You can also fully expect that properly coated steel will easily last more than plenty long enough for you to get you to your next 'family necessitated upgrade', and shift your focus and resources toward that end. :)

The other thing is . . . I would not build the cage any smaller than need be in any case. You can always run a smaller prop in a bigger cage, you can never run a bigger prop in a smaller cage. :idea: While it may not be as important on a small hot rod as it is with something much bigger, the reality remains that for all out push, diameter trumps pitch when other things are equal. This is why you see helicopters with very long skinny blades instead of the short fat ones that we run out of necessity.

When you get that far, you will come to the realization that 72" is a VERY common size prop, and consequently a little easier to find due to the shear numbers of them around. It would be a shame that has happened many times before, to build the cage to fit a smaller prop and then find the deal of a lifetime on one that is just a little to big to use without having to regroup and start over, so to speak. It has already been shown that a 76" cage will fit a 72" prop rather nicely. 8)
"The suppression of uncomfortable ideas may be common in religion and politics,
but it is not the path to knowledge; it has no place in the endeavor of science."
- Carl Sagan

Muckduck
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Re: Honda CBR 600cc 10x6 Aluminum Airboat Build

Postby Muckduck » Fri Oct 27, 2017 9:35 pm

Thank you Russ and Deano, excellent information and input! I really appreciate it. I think steel is going to be the material of choice and I should take the cage as wide as I can and aim for a 72" prop.

After thinking about the fatigue strength of aluminum I added a couple more deck supports up front and under all of 1" angle deck supports I welded in a second piece of angle to get me a little more weldable surface to support the deck and associated stresses.

I ordered a gallon of steel flex 2000 super slick and white pigment and did some prep to get it ready for coating. I'm thinking ultimately the deck and rigging will be painted like a darker silver with blue seadek on the deck. That's the thought on overall look so far.

I did some clean up on the engine and pulled the carbs to clean them out so that it will be ready for its engine stand. Next step is to go pick up some metal and get started on the stand.

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Re: Honda CBR 600cc 10x6 Aluminum Airboat Build

Postby Muckduck » Sun Nov 05, 2017 7:38 pm

Update. I got my order of 1gallon steelflex 2000 super slick with white pigment from fasco and I also opted to place an order for some of their #26 fairing compound. When I welded the center seam of the hull and and stringers to the hull I learned why it wasn’t welded. I got some warpage but was able to fair it all out nicely with the fairing compound after prepping the hull with aluminum brightener. That aluminum brightener does an amazing job cleaning aluminum. I wish I knew about it months ago.

I laid down four thin layers of the steelflex super slick and it is super slick. Love how the finish turned out. I used a squeegee and a roller but I finished each coat with the squeegee because it produces a super smooth surface compared to the roller.

That’s it for now. Need to get some metal for an engine stand.
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Muckduck
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Re: Honda CBR 600cc 10x6 Aluminum Airboat Build

Postby Muckduck » Sun Nov 05, 2017 8:13 pm

Fairing and steelflex superslick
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Garrett314
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Re: Honda CBR 600cc 10x6 Aluminum Airboat Build

Postby Garrett314 » Mon Nov 06, 2017 6:50 pm

this is a great project, thanks for sharing. I am intrigued! :usa:
13'6 cottonmouth with poly, 520 gpu, 2 blade terminator

Muckduck
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Re: Honda CBR 600cc 10x6 Aluminum Airboat Build

Postby Muckduck » Thu Nov 23, 2017 2:32 pm

Happy Thanksgiving everyone. Thanks Garret! Yeah it’s a project that I am definitely enjoying and I’m glad to be able to share it.

I have made a little bit of progress. I cut all the aluminum decking to size with no measurement errors. Stripped all the old paint off the aluminum. The decking metal was from old carnival haunted houses so they had some ghosts and stuff painted on them that I didn’t care for even on the underside of the deck, bad vibe, so a little paint stripper and prayer took care of that. Think the boat it really starting to come together now. I am going to hold off on painting or riveting the decking until I get the engine and seat stand underway and I still need to pick up and cut holes for a couple 4”-6” round deck hatches. They will be back near the transom for access to the bilge pump, drain plug and the engine stand and cage bolts.

I picked up 24’ of 3/4” 1/16th wall square tubing and some 1 1/2” x 3/16” flat bar for mounting and bolting through. Still trying to work out the plan for the engine stand to accommodate sprockets, chain, pillow blocks, types of bearings, shaft diameter plus many other variables and making it all work together. The engine is a little awkward to work with.

What is the average depth of most pancak cages? 10” 12” 14”? I guess it varies with prop and adapter. If I can get away with 10” it would leave more working room for the engine stand.
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Muckduck
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Re: Honda CBR 600cc 10x6 Aluminum Airboat Build

Postby Muckduck » Wed Dec 13, 2017 9:58 pm

Managed to get the deck riveted down and picked up a couple 4” hatches for the back to access drain plug and bilge.

I am doing a 1 1/2” lip around the opening in the center of the hull with an alumnum lid. That way I can keep the leaves and junk out and have storage and if I need to put something bigger down there I can leave the lid off. I just built the 1 1/2” frame for the opening and a 1” angle frame to use for the lid. Need to complete the lid and bolt the frame down with stainless hardware.

The engine stand is under construction but I got to the point that I needed to order bearing, sprockets, shafts and the like for the mock up, so I did that. I’ll post pics of that as I make a little more progress.
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