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Some call it Grease ball I call it

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d4570 View Drop Down
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    Posted: 20 September 2015 at 10:56
Airboat !!!
This is my new airboat, Whatcha think ?
All I need is a few more parts, and it will be sea worthy RIGHT ?
I checked the compression "0" on all 4 cylinders. What?
Plan "B"
I adjusted the Lifters and bam I had compression.
125 on #1 119 on #2 120 on #3 and 129 on #4.
It's a 1971 bug motor I'm thinking that will work for now.





On that same subject Anyone up on there VW ID and knowledge?
The # on the generator post Identifies it as a 1971 1600 cc 60 hp. motor. BUT for a carburetor I need to know if it is single or double port? I can see it is a one barrel and Single carb. Then there is some kind of thing like 3e or something What's that?
Need a little help here guys I want to get a carb, coil, Distributor cap points plug wires and starter on order and see if thing will spring to life...











D

Edited by d4570
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BEAR Quote  Post ReplyReply Direct Link To This Post Posted: 20 September 2015 at 11:10
engine looks like a work-horse bug engine.

Hull is??????
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Post Options Post Options   Thanks (0) Thanks(0)   Quote d4570 Quote  Post ReplyReply Direct Link To This Post Posted: 20 September 2015 at 11:16
"Hull is?????? "

In the planning stage, I'm going to go catamaran style
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wing master Quote  Post ReplyReply Direct Link To This Post Posted: 20 September 2015 at 15:59

D,

Your enging is a dual port.

Here is a picture of a single port engine I have in my shop.

Yours has the cast dual intake ports and mine has a single tube intake port. The heads are different too. I would think the difference in the carb would be where it bolts to the intake.

I have always considered myself to be quite the bullshitter, But ocasionally it is nice to sit back and listen to a true professional......So, Carry on.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BEAR Quote  Post ReplyReply Direct Link To This Post Posted: 21 September 2015 at 02:15
D remember. Generally, Catamaran hulls are displacement designed hulls...lots of drag; needs more horse power to plow the water, they never get up on plane.

Air boats are built on "planning" style hulls, like the jon boat or other FLAT bottom bottoms. These get up on plane fast and are low drag so higher speed.

Just thoughts.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CB900F Quote  Post ReplyReply Direct Link To This Post Posted: 21 September 2015 at 04:57
D;

A couple of other considerations: Will the engine be
mounted on the hull? In which case, how will you drive
the prop? If it's going to be a direct drive, then the
height of the engine will demand the hull be large enough
to provide stability in dynamic situations. A higher
center of gravity lowers stability. Water will lubricate
a V-belt drive system. Chains rust. Bevel gear drives
are large, heavy, and expensive. U joints are not happy
with 90 degree bends.

The propeller used will make a great deal of difference
in the efficiency of transferring power to forward motion
also. Do some research on diameter & pitch to get the
desired results before buying.

900F
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Post Options Post Options   Thanks (0) Thanks(0)   Quote d4570 Quote  Post ReplyReply Direct Link To This Post Posted: 21 September 2015 at 08:13
I Will and I am.

Bear I'm planning on "FLAT" cat floats, Have to make them. Kinda like two 14 foot long 2 foot wide Jon boats. I have read the Prop torque Tends to tip you over with a narrow boat. I'd like to space the floats to make the boat 5 to 6 foot wide. ( I think ) From the preliminary research I have done I need to reduce the RPM to around 1500 rpm from a Hoped 3000 on the motor. You HAVE to keep the tips of the prop Sub sonic or the Howling will make your ears bleed. From what I have found a 48 or 50" 29* pitch two blade wooden prop is what could work if I can get 50 hp. out of it. I think I'll try a snowmobile clutch/ torque converter for the drive, don't know yet. I can get a drive off the puter that uses a flat cogged belt but at $1500 + just for the drive I don't know.
Thanks wing I'm looking for a rebuilt carb for a 71 1600 cc VW Dual port single barrel now. I need a starter that does not hook to a bell housing too.
It's going to be a multi year protect I think.



Edited by d4570
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wing master Quote  Post ReplyReply Direct Link To This Post Posted: 21 September 2015 at 14:42

It sounds like a fun winter project.

Wing master

I have always considered myself to be quite the bullshitter, But ocasionally it is nice to sit back and listen to a true professional......So, Carry on.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BEAR Quote  Post ReplyReply Direct Link To This Post Posted: 21 September 2015 at 16:00
the 14x2 cat will have no more displacement than a 14x48' standard jon boat.

"Prop torque Tends to tip you over" ; as you tip a cat all the buoyance needs are transferred to a single 14x2 platform. Also, when racing cat sailboats, I can tell you the lone sponson tends to dig deep. this can twist you into a sharp undesired turn. Because of this the gunwale profile and sheer are very important so you can steer back without out flipping.

With your power configuration, you will have a significant amount of vibration. plywood construction will need to be greatly re-enforced.

Airboats are VERY sluggish on steering, very slow to respond to a change of direction. Importantly you are steering with an air rudder, not a hydraulic rudder. The steering is totally independent of your boat speed. Steering will depend only on your prop speed. If you get slightly unstable and reduce the prop RPM, you immediately lose steering.

Tricky things these air boats.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote d4570 Quote  Post ReplyReply Direct Link To This Post Posted: 22 September 2015 at 01:28


All good advice.
It will be all aluminum and steel no wood.
Yes I know 'bout the eleco thing and will be mindful of it.
When I'm driving the jet I lose steering when the rpms drop too. Not the same I'm sure but similar.

The primary use of the boat will be running in 3" or less water some times no water. It will have to navigate in deep water some times I guess I'll just have to go slow. The mud boat will only go 9 mph in deep water but in 5" it will go almost 20 mph...
Ice. snow and river gravel will be the norm I think.


D
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CB900F Quote  Post ReplyReply Direct Link To This Post Posted: 22 September 2015 at 12:30
D;

I wish you all the luck and good will in the world on this
project. But, I'll also tell you that it sounds like the
perfect project for a truly dedicated masochist!

900F
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Post Options Post Options   Thanks (0) Thanks(0)   Quote d4570 Quote  Post ReplyReply Direct Link To This Post Posted: 22 September 2015 at 13:14


B=brake
O=out
A=another
T=thousand


I am aware of the slippery slope thing. The boy has 3 boats one we built and I have the big jet that cost more them my house...
D


Edited by d4570
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Irish Bird Dog Quote  Post ReplyReply Direct Link To This Post Posted: 23 September 2015 at 15:00
you sure are a heap of an optimist D....wish you well on
your project. guess you and boy must be pretty handy with
wrenches too. Keep us informed.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote deaddog Quote  Post ReplyReply Direct Link To This Post Posted: 24 September 2015 at 04:47
http://www.amazon.com/Keep-Volkswagen-Alive-Step-
Step/dp/1566913101

A must have book. How to keep your Volkswagen alive.

It holds your hand through everything bug related. Way better than any
shop manual.

As much as you have to work on the things to keep them running
believe me you'll need it! No individual task or problem it that difficult it's
just that things quit working properly at the most inopportune times.
Notice I didn't say break, things like the valves you mentioned or the
carb(s) get out of whack. The thing will still run but they are so low on
power to begin with that any little thing makes them run like crap. I
have a VW powered Meyers Manx dune buggy and struggle to keep it
going. In fact it hasn't been on the road in several years. I owned and
raced stock cars for four years so I'm not completely inept with a
wrench, but that thing gets the better of me.
I don't know anything about airboats but I have a fair amount of
experience with air cooled engines with props. The big reason for using
them is for their low end torque and ability to bolt directly to the crank.
You are defeating the whole purpose of them by using a gear reduction.
You'd be way better off with a liquid cooled Honda-Toyota etc than a air
cooled. 2200-2500rpm is the goal. The amount of power required to
pull a prop of any useful size 3000rpm is tremendous. It's the
aerodynamic drag and the noise of the supersonic tips that are a waste
of energy. Just pull a different pitch like you would with a boat prop. The
analogy would be that you want a prop that will pull five skiers out of
the water rather than have a 70mph top speed. The same engine
in a car will do 4500 but pulling a prop- only half of that. The other thing
is vibration. Make sure your prop is balanced and probably use some
type of rubber mount. Good luck!

DD

Edited by deaddog
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Post Options Post Options   Thanks (0) Thanks(0)   Quote d4570 Quote  Post ReplyReply Direct Link To This Post Posted: 24 September 2015 at 06:18
BUT DD
My boat will spend way more time " trying to pull 5 people " then going 70 mph.
I'm not planning an open water/deep water boat. I think I'll spend way more time on partly frozen mostly dry river bottoms and all ice on lakes then water anyway. So if I can't make it "Plane" it's not a huge deal Just has to move, the Mud Boat only goes 9 MPH in deep water but where we use it In 4" of water it will do 19, that's real fast when your racing up a ditch or creek...
I have a VW motor I don't have another one of any kind.
2000 rmp, is that the prop speed ?
I'm doing a LOT of research and what I'm reading is A prop 48 to 50 Inches long and a 29* pitch ???
A two bladed wooden prop is about all I'll be able to afford. A three or four blade composite with adjustable pitch would be great But at close to $2000 it is not a possibility. Everything I read ,and talk with Airboat guys say I would not have the HP to spin a direct drive prop. The ones that have a mini and VW motor recommend a reduction of 2 to 1 or 2 1/2 to 1 belt system.
There again at $1500 for a drive I'm thinking I'm going to try and use a used Snowmobile belt drive with a torque converter system and try to turn as big a blade as I can. I just don't know how big that is.
I have read also If a person can "Duct" the fan you can pick up a good amount of thrust with the same input. with a tad bit LESS noise from the prop. I don't know how I would do that but there again the Red neck in me is screaming " road culvert"...Take an appropriate sized peace of plastic culvert And ducting it with that some how.????
All In the planning stages still.
First I need a carb, starter and some ignition stuff and make the motor "Run".
How about a boat? I'll need one of them too....


Edited by d4570
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CB900F Quote  Post ReplyReply Direct Link To This Post Posted: 24 September 2015 at 11:58
D;

I'm willing to bet that in the long run, you'll wish you'd
found one of those amphibious 6-wheel ATV kinda things.
The noise factor alone will probably run off waterfowl for
at least a half mile in any direction from an airboat. I
also get the feeling (shiver!) that you're gonna learn more
about wind chill than you ever wanted to know.

900F
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Post Options Post Options   Thanks (0) Thanks(0)   Quote d4570 Quote  Post ReplyReply Direct Link To This Post Posted: 24 September 2015 at 12:30
Wind chill !
You have not had "Wind Chill" till you have run the Missouri river In the pitch dark In a loaded mud boat, Standing . When it's -5*....

I'll bet I could have a wind shield in the front of my air boat. We have one on the snowmobile / 4 wheeler sled that I HAVE to ride in ...As far as noise It will jus let them know to get there affairs in order, death is coming!

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Post Options Post Options   Thanks (0) Thanks(0)   Quote CB900F Quote  Post ReplyReply Direct Link To This Post Posted: 24 September 2015 at 15:13
D;

On the wind chill, I beg to differ. I come from the (as
far as I'm concerned)wind capitol of the U.S. Once upon a
time, not nearly long enough ago, I was out in -138 degrees
fahrenheit wind chill. That was on Casper Mountain when
the bottom fell out of the thermometer and the wind came
up. WAY UP. We had to get people off the mountain before
it literally killed them, and it damn near killed me.

900F
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Post Options Post Options   Thanks (0) Thanks(0)   Quote deaddog Quote  Post ReplyReply Direct Link To This Post Posted: 25 September 2015 at 07:37
D, I think you may have misunderstood? I agree you need a flatter pitch
prop to pull quicker. The prop rpm is the same as the engine. The prop
tips are moving at a faster speed but they are still doing the same rpm
as the slower moving crank. They have farther to go in the same period
of time.

DD
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