Honda CBR 600cc 10x6 Aluminum Airboat Build

Airboats with smaller powerplants.
Muckduck
Southern Airboat Member
Posts: 48
Joined: Sun Jan 24, 2016 2:16 pm

Re: Honda CBR 600cc 10x6 Aluminum Airboat Build

Postby Muckduck » Sat Aug 04, 2018 12:23 pm

It’s been a little bit sinc my last post but I have made a fair bit of progress since then.

I finally made enough room in the garage to slide the boat in. The engine stand was starting to rust a little from sitting outside even with a tarp on it. Not being a big fan of cleaning and prep work prior to painting i didn’t want the seat stand or the cage to start rusting. I hit the cage with some primer to protect it until I’m ready to work on rudder mounts.

I have pretty much finished the seat stand. The front seat will be removable. I mounted the gauge console on the floor because it was pretty clunky looking on the side of the seat stand. It just seemed practical there; low CG, out of the way, short wiring runs, etc.

Using expanded aluminum for the floor and driver seat basket as well as for chain guards. All the aluminum is bolted down with 1/4-20 bolts which requires a ton of mounting tabs. I have made a bunch already by drilling twice and cutting with a sawsall. I underestimated how many tabs it would take but I have a friend with a shear and a punch and die so I was able to cranck our 48 1”x1 1/2” tabs with a 5/16” hole in about 30-45min. I still have a little more work to do with the chain and sprocket guards and a guard for the prop shaft.

I picked up some aluminum to build a gas pedal assembly and after that I need to start thinking about rudders ad mounting.
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John Fenner
Southern Airboat Member
Posts: 2683
Joined: Tue Feb 14, 2012 12:26 pm
Location: Miami(Cuba) Fl.

Re: Honda CBR 600cc 10x6 Aluminum Airboat Build

Postby John Fenner » Sun Aug 05, 2018 9:08 am

Interesting build, following to see the final outcome, you are doing very clean work!!
I never finish anyth,,,.

Muckduck
Southern Airboat Member
Posts: 48
Joined: Sun Jan 24, 2016 2:16 pm

Re: Honda CBR 600cc 10x6 Aluminum Airboat Build

Postby Muckduck » Sun Aug 19, 2018 5:22 pm

I added a little safety to the prop shaft area to prevent entanglement and just in case something cut loose.
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Muckduck
Southern Airboat Member
Posts: 48
Joined: Sun Jan 24, 2016 2:16 pm

Re: Honda CBR 600cc 10x6 Aluminum Airboat Build

Postby Muckduck » Mon Sep 03, 2018 7:11 pm

Just about finished building a gas pedal, it’s still has some finishing and I need to make the cable holder for it. I found a good side profile pick of an airboat gas pedal and went with it. It’s probably a little over engineered but better that than under.

I have to order some more clutch and throttle cable parts to get those sorted out. I also have 2x stainless uhmw pillow block bearings coming for the rudder stick.

Trying to figure out what to do with the exhaust....
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Muckduck
Southern Airboat Member
Posts: 48
Joined: Sun Jan 24, 2016 2:16 pm

Re: Honda CBR 600cc 10x6 Aluminum Airboat Build

Postby Muckduck » Thu Sep 20, 2018 12:01 pm

I finished up the gas pedal with a few minor tweaks of the geometry to get the pedal travel I was looking for and built a new throttle cable.

Mounted some uhmw pillow blocks to hold the rudder stick.

Shortened the stock muffler about 6” so that it will fit in the cage a little better. Still need to mount th muffler in its final location.

The trailer that came with the boat originally sat reall high and had some rotted out springs so I put new springs, u bolts and a 2” drop axle. It still wasn’t as low as I wanted It so I whipped up some rollers.
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Muckduck
Southern Airboat Member
Posts: 48
Joined: Sun Jan 24, 2016 2:16 pm

Re: Honda CBR 600cc 10x6 Aluminum Airboat Build

Postby Muckduck » Thu Sep 20, 2018 12:09 pm

With the trailer fixed up I was able to pull the boat out of the garage and throw it into the pond for the first float test with all the weight of the engine and stand, cage and seat stand.

I could not have asked for it to float and better than it does. I can stand on all around the boat and only at the back by the cage does the very corner of the deck get wet. I had my wife get on with me and it floats rock solid and stable.

This was a huge gamble as I never tested the hull to see how much weight it could handle and it looks like it has worked out in my favor.
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Muckduck
Southern Airboat Member
Posts: 48
Joined: Sun Jan 24, 2016 2:16 pm

Re: Honda CBR 600cc 10x6 Aluminum Airboat Build

Postby Muckduck » Sat Oct 06, 2018 3:50 pm

I cut up and shortened the stock muffler about 6-8” and put it all back together and welded a bracket to the cage and use the original exhaust hanger but upside down to mount the pipe. I cut and rotated the fitting at the headers to get the curve in the flex pipe that I wanted. And that pretty much took care of the exhaust situation.

I welded a couple tabs at the top of the cage for a collapsible running light as well.
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Muckduck
Southern Airboat Member
Posts: 48
Joined: Sun Jan 24, 2016 2:16 pm

Re: Honda CBR 600cc 10x6 Aluminum Airboat Build

Postby Muckduck » Sat Oct 06, 2018 4:01 pm

I spend a lot of time thinking about something before I do it so that I don’t have to undo it or redo it but it inevitable that you will. I originally welded the bracket for the bilge pump on the right starboard side of the hull before it had slick bottom on the hull and it was decked over. Well it wasn’t going to work where I had it because of the exhaust and the parts i had to work with. I welded a new bracket on the left side and tried to cool everything quickly to prevent damage to the slick bottom. Luckily I only browned it in a couple spots. Due to the type of bilge discharge fitting I had to run a piece of tubing out the back and that was what I was worried about it melting from being close to the exhaust. I had been nervous to drill a hole in the deck until I knew I had the right spot. So all worked out well and now I’m starting on making some rudders. Just picked up the material and will update as it comes together.
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Air canada
Southern Airboat Member
Posts: 21
Joined: Sun Oct 29, 2017 2:46 pm

Re: Honda CBR 600cc 10x6 Aluminum Airboat Build

Postby Air canada » Sat Oct 06, 2018 9:13 pm

Boat looks awesome can't wait to see vid of it rocking
:canada:

Muckduck
Southern Airboat Member
Posts: 48
Joined: Sun Jan 24, 2016 2:16 pm

Re: Honda CBR 600cc 10x6 Aluminum Airboat Build

Postby Muckduck » Sun Oct 07, 2018 7:16 pm

Thank you. I am pretty happy with how’s its coming together. Here are the rudders I cranked out over the weekend. They are 32” x 18”. Center of pivot is 6”. They have a piece of tubing inside that is a about 7/8” OD. The leading and trailing edges are welded up and the end plates are just tac’ed as of now. Top plate is 1/8” and botttom is 3/16 because that is what I had material to do and I figured the extra thickness would be good for the control linkages.

The rudders took a lot less time than I was anticipating so I need to catch up on my planning. I was going to start on rudder mounts first but now I’m not sure if I want to start on the prop shaft adapter first. To be continued.
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