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

Go Back   Boat Design Forums > Design > Boat Design
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 01-02-2009, 12:22 AM
Equalitude Equalitude is offline
 
Join Date: Jan 2009
Rep: 10 Posts: 3
Location: San Francisco
Converting Bicylce to Pedal Boat

I was wondering if it was possible to use the pedals, gears, and drive chain of an already set-up bicycle to power a single blade propeller. Has anyone done this before and are there vendors online that can offer the parts to accomplish this?
Reply With Quote


  #2  
Old 01-02-2009, 12:29 AM
Guest625101138 Guest625101138 is offline
Previous Member
 
Have a look through this thread and see if it offers some useful insight:
Pedal Powered Boats
In a couple of days you should pick up a lot of ideas that you can explore to suit your needs.


Rick W
Reply With Quote
  #3  
Old 01-02-2009, 01:24 AM
tinhorn's Avatar
tinhorn tinhorn is offline
Senior Member
 
Join Date: Jan 2008
Rep: 310 Posts: 565
Location: Massachusetts South Shore.
These weren't designed to be connected to a prop, but there's much to be said for the paddle wheels. There are a ton of such old patents available at http://www.amazon.com/Human-Power-Bo...0877358&sr=8-1 .
Attached Thumbnails
Converting Bicylce to Pedal Boat-us000691805-001.jpg  Converting Bicylce to Pedal Boat-us001409965-001.jpg  Converting Bicylce to Pedal Boat-z1950-001.jpg  

Converting Bicylce to Pedal Boat-z1950-002.jpg  
Attached Images
File Type: jpg us000582666-001.jpg (192.1 KB, 780 views)
Reply With Quote
  #4  
Old 01-02-2009, 02:22 PM
Equalitude Equalitude is offline
 
Join Date: Jan 2009
Rep: 10 Posts: 3
Location: San Francisco
Thank you guys for your help. Both posts have definitely been very helpful.

I have a more specific question as well. Do you think it's a crazy idea to modify the bicycle wheel itself by adding some paddles to it so that all you have to do is dip the wheel in water and have it propel the boat? I like that patent image but it seems like there are two sets of gear systems and drive chains which almost defeats the convenience of just using a bicycle.

Finally, are there some retail stores that can sell you parts to accomplish this task? I don't have any welding experience nor do I have access to a machine shop.

Thanks guys!
Reply With Quote
  #5  
Old 01-02-2009, 07:20 PM
Guest625101138 Guest625101138 is offline
Previous Member
 
Quote:
Originally Posted by Equalitude View Post
Thank you guys for your help. Both posts have definitely been very helpful.

I have a more specific question as well. Do you think it's a crazy idea to modify the bicycle wheel itself by adding some paddles to it so that all you have to do is dip the wheel in water and have it propel the boat? I like that patent image but it seems like there are two sets of gear systems and drive chains which almost defeats the convenience of just using a bicycle.

Finally, are there some retail stores that can sell you parts to accomplish this task? I don't have any welding experience nor do I have access to a machine shop.

Thanks guys!
The key items for a really nice boat drive are a right angle gearbox and a propeller. It is a challenge to make a good system without shop facilities but not impossible.

The best right angle drives I know of are Mitrpak:
http://www.mitrpak.com/product_datas...?product_id=31
The one shown is OK for moderate power input. If you really want to sprint hard then go up to the 1/2".

I have suggested the 2:1 so you can use a model plane prop. You can get these from here:
http://www.hobbycity.com/hobbycity/s...site_propeller
This prop would be run around 8x cadence. So 4:1 from crank and 2:1 in the rightangle drive.

There is one readily available boat prop that is OK. It is not too bad but needs to be run about 5X cadence and will only suit an easily driven hull. It is a 15 X25 Bolly boat prop about half way down the linked list:
http://www.bolly.com.au/models/glasstwo.html

You can get a prop collet from Hobby City as well:
http://www.hobbycity.com/hobbycity/s..._shaft_(collet)

For the frame you butcher an old bike. Just cut out the bottom bracket with about 14" of frame tube on either side. This is inverted and mounted onto the boat. It is easy to weld or braze mounting plates but if you do not have the facility then get some epoxy resin and fibreglass tape. The frame and seat shown in the attached photo does not have any welding in it. It is all made from carbon fibre cloth, Klegecell foam sheet and Epoxy Resin. It weighs under 5 kilograms including the crank and gearbox.

You can also buy metal brackets that can be riveted or screwed to the frame and then glassed over. You would need a hand drill for this.

I buy resin and cloth from here:
http://www.solidsolutions.com.au/
http://fgi.findnearest.com.au/findne...sult.asp&log=1
I am sure you can find places near you with the same materials.

The set up shown on the attached photo is about the best you can get. The offset thrust from the side mounted prop requires negligible effort to correct with small rudder angle. It avoids holes through the hull and the prop can be reached for cleaning off weed. I usually detach the shaft for transport. It is held in place with two thumb screws.

Finding a source of aluminium sections for bits and pieces is handy. I have 5 locations within 20 minutes drive of my home. You can use machinable aluminium rod for the curved prop shaft similar to what I have shown. Aluminium and glass/epoxy work well together. A glass/epoxy wrapped joint is likely to be stronger than a weld if done properly.

I use this supplier for other bits and pieces:
http://www.smallparts.com.au/catalogue/
There are smallparts locations in the US as well that supply quickly.

Sitting up on a bike is not the best position for a boat. Your centre of gravity is high and you are more likely to roll it. A recumbent position is best for boating.

Fitting paddles to a bike wheel is not all that easy. To be effective they need to be about 4ft wide so dinky little ones a few inches across that can run through the frame will do nothing.

Rick W
Attached Thumbnails
Converting Bicylce to Pedal Boat-pc240007.jpg  
Reply With Quote
  #6  
Old 01-02-2009, 07:50 PM
Guest625101138 Guest625101138 is offline
Previous Member
 
This clip shows a boat almost identical to mine in operation and some close-up of the drive system:
http://www.youtube.com/watch?v=OTITP...eature=related
Greg did the 1000m in just over 4 minutes so close to 15kph. He is 48yo and a mid level professional athlete who specialises in marathon events. The boat is really not intended for sprinting and was not conditioned for it at the time of making the video. I expect he was holding around 270W over the 1000m.

I have hit 18.2kph on mine with the best sprint set up.

Rick W
Reply With Quote


  #7  
Old 01-04-2009, 11:59 AM
Equalitude Equalitude is offline
 
Join Date: Jan 2009
Rep: 10 Posts: 3
Location: San Francisco
Quote:
Originally Posted by Rick Willoughby View Post
The key items for a really nice boat drive are a right angle gearbox and a propeller. It is a challenge to make a good system without shop facilities but not impossible.

The best right angle drives I know of are Mitrpak:
http://www.mitrpak.com/product_datas...?product_id=31
The one shown is OK for moderate power input. If you really want to sprint hard then go up to the 1/2".

I have suggested the 2:1 so you can use a model plane prop. You can get these from here:
http://www.hobbycity.com/hobbycity/s...site_propeller
This prop would be run around 8x cadence. So 4:1 from crank and 2:1 in the rightangle drive.

There is one readily available boat prop that is OK. It is not too bad but needs to be run about 5X cadence and will only suit an easily driven hull. It is a 15 X25 Bolly boat prop about half way down the linked list:
http://www.bolly.com.au/models/glasstwo.html

You can get a prop collet from Hobby City as well:
http://www.hobbycity.com/hobbycity/s..._shaft_(collet)

For the frame you butcher an old bike. Just cut out the bottom bracket with about 14" of frame tube on either side. This is inverted and mounted onto the boat. It is easy to weld or braze mounting plates but if you do not have the facility then get some epoxy resin and fibreglass tape. The frame and seat shown in the attached photo does not have any welding in it. It is all made from carbon fibre cloth, Klegecell foam sheet and Epoxy Resin. It weighs under 5 kilograms including the crank and gearbox.

You can also buy metal brackets that can be riveted or screwed to the frame and then glassed over. You would need a hand drill for this.

I buy resin and cloth from here:
http://www.solidsolutions.com.au/
http://fgi.findnearest.com.au/findne...sult.asp&log=1
I am sure you can find places near you with the same materials.

The set up shown on the attached photo is about the best you can get. The offset thrust from the side mounted prop requires negligible effort to correct with small rudder angle. It avoids holes through the hull and the prop can be reached for cleaning off weed. I usually detach the shaft for transport. It is held in place with two thumb screws.

Finding a source of aluminium sections for bits and pieces is handy. I have 5 locations within 20 minutes drive of my home. You can use machinable aluminium rod for the curved prop shaft similar to what I have shown. Aluminium and glass/epoxy work well together. A glass/epoxy wrapped joint is likely to be stronger than a weld if done properly.

I use this supplier for other bits and pieces:
http://www.smallparts.com.au/catalogue/
There are smallparts locations in the US as well that supply quickly.

Sitting up on a bike is not the best position for a boat. Your centre of gravity is high and you are more likely to roll it. A recumbent position is best for boating.

Fitting paddles to a bike wheel is not all that easy. To be effective they need to be about 4ft wide so dinky little ones a few inches across that can run through the frame will do nothing.

Rick W
Wow thanks Rick! That was probably the most help ever.
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
Where to start on a pedal powered boat? ryan808 Boat Design 67 06-09-2011 07:09 PM
Pedal Boat Design BG_Geno Boat Design 676 05-23-2009 10:50 PM
Converting wooden boat designs to aluminum construction dick stave Metal Boat Building 15 03-20-2007 03:44 AM
wood pedal boat- idea molerocket Boat Design 3 07-20-2006 06:40 PM
Converting a small boat to a trimaran endorphinjunkie Boatbuilding 3 05-07-2005 11:42 PM


All times are GMT -4. The time now is 10:34 PM.


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