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OK what about a surface drive for the bug

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d4570 View Drop Down
.416 Rigby
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    Posted: 26 May 2020 at 19:21
A surface drive is a little different then a "long Tail".
The shaft is much shorter and not always turned with a tiller, sometimes with a reverse.
I'm thinking the VW motor is not a good candidate to hang off the transom and tiller steer.
Maybe sit a little forward and drive an out drive with a PTO.
It would take a surface piercing prop Maybe like 15".
A drive shaft through the transom would be the easiest with hydraulic  linear actuators would be the fast idea.
BUT no transom on a cat.
Maybe something like a lower unit as on an outboard that is driven from the top with a PTO shaft and u joints.
Some kind of struts to let the unit rise over obstetrical as rocks and logs. The drive in the water/mus normally is 2 to 3 feet long and has a very stout scag to protect the prop.
I think it would be similar to a tunnel hull and use water trapped by the cats. ANY ideas?
Some examples 




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Post Options Post Options   Thanks (0) Thanks(0)   Quote BEAR Quote  Post ReplyReply Direct Link To This Post Posted: 27 May 2020 at 08:37
Black foot looks cool.

Thinking outside the box, how about a jet drive inside the cat-toons.  would be easy to low for deep water and move up to the level of the bottom of the boat in shallows.  only bummer is jet drives and weeds/sand don't mix.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote d4570 Quote  Post ReplyReply Direct Link To This Post Posted: 27 May 2020 at 14:27
Sand is OK it's the moss and willow branches that will stop you, the rocks don't help either.
 Gota jet now jet is like air the loss is to high, a 60 hp is only 35 to 40 on a jet.
If I change it will be a prop.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BEAR Quote  Post ReplyReply Direct Link To This Post Posted: 27 May 2020 at 15:05
What is the hurry????   your retired now....relax getting there can be half the fun.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wing master Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2020 at 02:12
If you go with a prop you won't be able to go across mud or ice or whatever you could with an air boat. 

I think the snow mobile engine is a good idea.

But, That's coming from someone that knows nothing about boats.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote d4570 Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2020 at 07:31
A surface drive prop is like a mud motor prop and will run through mud and bounce over rocks. NO ice or dry ground.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wing master Quote  Post ReplyReply Direct Link To This Post Posted: 30 May 2020 at 21:55
I didn't know that. That's interesting. I would think that even with the air drive you wouldn't go over dry ground very often. Except maybe before loading it on a trailer. 

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