Boat Design Forums  |  Boat Design Directory  |  Boat Design Gallery  |  Boat Design Book Store  |  Thanks to Our Site Sponsors

Go Back   Boat Design Forums > Design > Propulsion > DIY Marinizing
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read Most Recent Posts Gallery Images Search

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 08-07-2005, 10:42 PM
jchronister3468 jchronister3468 is offline
Junior Member
 
Join Date: Aug 2005
Rep: 10 Posts: 1
Location: arkansas
how do i build a boat motor with a lawn more engine

hello everyone i need some help. i would like to know an enexspenisve way to buld a boat motor with a lawn mower engine im going put it on a home made 14 ft jon boat any sugggestians would be appreiated with this.thank you jerry
Reply With Quote


  #2  
Old 08-07-2005, 11:02 PM
yokebutt yokebutt is offline
Boatbuilder
 
Join Date: Aug 2004
Rep: 15 Posts: 545
Location: alameda CA
Jerry,

Most expedient way is probably to graft the engine on to the lower end of a discarded outboard.

Yoke.
Reply With Quote
  #3  
Old 08-07-2005, 11:54 PM
gonzo's Avatar
gonzo gonzo is offline
Senior Member
 
Join Date: Aug 2002
Rep: 1865 Posts: 8,855
Location: Milwaukee, WI
The most inexpensive way is to get a used outboard. Look into an old SEARS/Ted Williams motor. They had Tecumseh motors. They were also very heavy for the power.
__________________
Gonzo
Reply With Quote
  #4  
Old 08-10-2005, 12:03 AM
Thunderhead19 Thunderhead19 is offline
Senior Member
 
Join Date: Sep 2003
Rep: 21 Posts: 504
Location: British Columbia, Canada
inexpensive way.....Make a sleeve out of pipe, and use it to add..I dunno say six feet of shaft to the motor. Get a piece of plywood with a hole in it (for the shaft) and mount the motor on it. Put a prop on the end of the shaft, fix the damned thing at an appropriate angle and mount the whole show into a rudder post. Now you have steering and trim. I saw this mostrosity on a documentary on...some...Polanesian..islander fishing ..environmental...something.
__________________
JDF


'"Forward, the Light Brigade!"'
-Alfred Lord Tennyson
Reply With Quote
  #5  
Old 08-13-2005, 11:01 PM
Ranger Ranger is offline
Junior Member
 
Join Date: Aug 2005
Rep: 10 Posts: 7
Location: Maryland
Take a look at http://www.go-devil.com/

It isn't exactly what you want but you can get an idea from it. In this case, the (horizontal shaft) motor would sit above the transom and the shaft/prop extend well back. The other choice is to run it through a stuffing box and out the underside of the boat. In the first example, you tilt the motor up to start it, then put it in the water. In the second, you have no clutch and you are fighting water resistance in order to start it.

One problem you never will actually solve is prop angle; it's going to be tilted the best you can do.
Reply With Quote
  #6  
Old 08-14-2005, 08:41 AM
lewisboats's Avatar
lewisboats lewisboats is offline
Obsessed Member
 
Join Date: Oct 2002
Rep: 1579 Posts: 2,138
Location: Iowa
Quote:
Originally Posted by Thunderhead19
inexpensive way.....Make a sleeve out of pipe, and use it to add..I dunno say six feet of shaft to the motor. Get a piece of plywood with a hole in it (for the shaft) and mount the motor on it. Put a prop on the end of the shaft, fix the damned thing at an appropriate angle and mount the whole show into a rudder post. Now you have steering and trim. I saw this mostrosity on a documentary on...some...Polanesian..islander fishing ..environmental...something.
Sounds like a 'Dragontail Motor'. The most likely example that comes to mind is in the Bond movie 'man with the golden gun'. He runs the canals of Bankok I believe.
Should be an easy build with a horizontal shaft motor.

Steve
Reply With Quote
  #7  
Old 08-14-2005, 09:38 AM
Bighillwill Bighillwill is offline
Junior Member
 
Join Date: Oct 2004
Rep: 10 Posts: 10
Location: "The Pass" MS Gulf Coast
If you tilt a vertical shaft mower engine very far, the splasher for the oiling doesn't work right. These engines don't run with actual oil pressure, just a splasher inside the case. running it on a tilt for very long will usually trash your engine.

If you can find a horizontal shaft motor, like from a rototiller, it would be better.
Reply With Quote
  #8  
Old 08-14-2005, 06:29 PM
Thunderhead19 Thunderhead19 is offline
Senior Member
 
Join Date: Sep 2003
Rep: 21 Posts: 504
Location: British Columbia, Canada
.....not to mention the carburetor. The oil situation assumes a "wet sump" motor, ie: a four stroke. I used to have a Lawn Boy mower that had a two stroke "dry sump" motor. It was light and powerfull and had quite a small power head....until I blew it up....
__________________
JDF


'"Forward, the Light Brigade!"'
-Alfred Lord Tennyson
Reply With Quote
  #9  
Old 12-30-2005, 10:12 PM
longliner45 longliner45 is offline
Senior Member
 
Join Date: Dec 2005
Rep: 505 Posts: 1,638
Location: Ohio
briggs straton are now making a boat motor with 5 hp 8hp or so .it is a lawn mower engine .they have worked the bugs out .and seem pretty cool probably be just as cheap to buy one new from them. dont know the web site .should be easy to find
Reply With Quote
  #10  
Old 02-28-2006, 06:51 PM
george allard george allard is offline
Junior Member
 
Join Date: Jul 2005
Rep: 7 Posts: 61
Location: kentucky
I have seen a lot of boats powered by Briggs and Stratton engines in the Reelfoot Lake area in north west Tennessee. They are all inboard mounts and used in the stumpy lake. They have a protected prop that never hits anything. Search for Reelfoot Lake on the internet.
Reply With Quote
  #11  
Old 03-28-2006, 01:50 AM
Richard Hillsid Richard Hillsid is offline
Senior Member
 
Join Date: Mar 2006
Rep: 19 Posts: 117
Location: Scandinavia
Found this image. War time Finland.
Attached Thumbnails
how do i build a boat motor with a lawn more engine-svene.jpg  
Reply With Quote
  #12  
Old 03-28-2006, 03:21 AM
Wellydeckhand Wellydeckhand is offline
Previous Member
 
Quote:
Originally Posted by Thunderhead19
inexpensive way.....Make a sleeve out of pipe, and use it to add..I dunno say six feet of shaft to the motor. Get a piece of plywood with a hole in it (for the shaft) and mount the motor on it. Put a prop on the end of the shaft, fix the damned thing at an appropriate angle and mount the whole show into a rudder post. Now you have steering and trim. I saw this mostrosity on a documentary on...some...Polanesian..islander fishing ..environmental...something.
Yahama, Robin and alot other brands sell this prop. Indonesia is graet user of such machine in rivers....... although do not suitable for sea..... beware.

The engine range from 3 mono- 24 Hp V machine can take from kerosen or gas run water emergency pump. The shaft act as a ratio kit that manage the propellar at the end side.

Useful but sound terrible as the noise in term of dB would make your nearest neighbour complaint.
Reply With Quote
  #13  
Old 03-28-2006, 03:27 AM
Wellydeckhand Wellydeckhand is offline
Previous Member
 
Quote:
Originally Posted by longliner45
briggs straton are now making a boat motor with 5 hp 8hp or so .it is a lawn mower engine .they have worked the bugs out .and seem pretty cool probably be just as cheap to buy one new from them. dont know the web site .should be easy to find
I prefer 2 stroke than 4 stroke because it is lighter but in Thailand I have seen they use small car engine with the pole.............
Reply With Quote


  #14  
Old 07-14-2006, 01:09 AM
1ghandi 1ghandi is offline
 
Join Date: Jul 2006
Rep: 10 Posts: 1
Location: Bendigo,victoria ,Australia
You need to set it up like the fishermen a Phuket Thailand do , same design as the Go-Devil , you will need the 2stroke engine about 6hp min also change the carb the LM carbs are too crude , I have bought Mikuni carbs for mine .
.....................................Cheers Ghandi
__________________
"Ignorance Is The Cosmic Sin , The One Never Forgiven"
Reply With Quote
Reply



Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Solomon Technologies - "Electric Wheel" electric motor propulsion systems lockhughes Hybrid 229 04-10-2013 05:25 PM
Auto engine marinization DIY Marinizing 231 07-01-2010 08:34 PM
Looking for the right path to design and build ben_morel Education 44 11-24-2005 04:51 PM
Need to build a 18ft Aluminum Boat myles king Boatbuilding 1 06-24-2005 11:20 PM
jet engine boat Powerboats 9 08-27-2002 10:00 AM


All times are GMT -4. The time now is 12:09 PM.


Powered by: vBulletin Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Web Site Design and Content Copyright ©1999 - 2014 Boat Design Net