Boat Design Forums  |  Boat Design Directory  |  Boat Design Gallery  |  Boat Design Book Store  |  Thanks to Our Site Sponsors
  #1981  
Old 08-20-2015, 11:35 AM
Tiny Turnip Tiny Turnip is offline
Senior Member
 
Join Date: Mar 2008
Rep: 613 Posts: 362
Location: Huddersfield, UK
A little film of an outing in my pedal powered cat, including some underwater footage, which may be of interest:

Reply With Quote
  #1982  
Old 08-20-2015, 11:52 AM
neonguy07 neonguy07 is offline
 
Join Date: Apr 2015
Rep: 10 Posts: 4
Location: peoria il
wow thats pretty cool setup and love the underwater view that was pretty shallow at times
Reply With Quote
  #1983  
Old 08-20-2015, 01:36 PM
hoytedow's Avatar
hoytedow hoytedow is offline
American Omnivore
 
Join Date: Sep 2009
Rep: 2403 Posts: 4,965
Location: North of Cuba
Cool vid, Tiny.
__________________
"Young people... reckless, but old people... dangerous." Fanie
"The universe is unfolding as it should." Yobarnacle
Reply With Quote
  #1984  
Old 08-20-2015, 03:35 PM
portacruise portacruise is online now
Senior Member
 
Join Date: Jun 2009
Rep: 218 Posts: 922
Location: USA
Interesting video, thanks for posting.

The underwater vids seem to show the props delivering power in pulses according to the pedaling cadence. Maybe the old concept of an elliptical sprocket would make things more efficient, is what I am thinking..

PC
Reply With Quote
  #1985  
Old 08-21-2015, 04:06 AM
Clemens Clemens is offline
Junior Member
 
Join Date: Jan 2010
Rep: 10 Posts: 14
Location: France
Hello, if you are aiming at a more continuous thrust, clip pedals are the clue to it. I am very satisfied with having modified one seacycle leg this way. A real improvement concerning efficiency. No more lost power to support the leg's weight, no more risk of a foot slipping off the pedal.
A challenge was to find an easy solution to change to clip pedals - since both pedal arms are threaded the same way.
Reply With Quote


  #1986  
Old 08-21-2015, 05:38 AM
Tiny Turnip Tiny Turnip is offline
Senior Member
 
Join Date: Mar 2008
Rep: 613 Posts: 362
Location: Huddersfield, UK
Thanks, Neonguy and Hoyt!

Porta, I think you're right - it does look that way, and you definitely get the feel of a power stroke and a pause when pedalling.

Hi Clemens! good to hear from you! I have actually put double sided pedals on - plain one sided and clips the other (you can just see the clips in some of the shots if you're quick!) but its rare that we're actually on a long run, or looking for high efficiency - just pootling round the bay here...

This was really just messing about getting to know the little waterproof camera, but the real eye opener for me is the amount of turbulence off the drive legs - it looks like more than from the hulls! I suppose to some extent they are like little tiny hulls pushed way beyond their normal hull speed and generating a load of wave resistance. I wonder if it might be worth fairing them?

I'm seriously considering a complete rebuild from scratch with some simple ply hulls, because the current build is so heavy. with the dart hulls forming keels, and the weight, its extremely difficult to pull up the beach.
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
Propellor for pedal powered catamaran Tiny Turnip Props 40 08-09-2015
01:45 AM 
Electric motors for solar-powered boats Twointense13 Boat Design 3 01-07-2011
08:21 PM 
Windmill or Wind Turbine- powered boats: how many are out there, and are they viable? Duma Tau Projects & Proposals 503 08-13-2010
02:00 PM 
Human-powered boats and submersibles RatliffFranklin Boat Design 0 05-08-2007
01:36 PM 
Bugatti engine powered boats rivaaquarama Powerboats 0 06-08-2006
04:26 PM 

Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.

All times are GMT -4. The time now is 06:13 PM.


Powered by: vBulletin Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Web Site Design and Content Copyright ©1999 - 2015 Boat Design Net