Boat Design Forums  |  Boat Design Directory  |  Boat Design Gallery  |  Boat Design Book Store  |  Thanks to Our Site Sponsors
Old 08-20-2015, 11:35 AM
Tiny Turnip Tiny Turnip is offline
Senior Member
Join Date: Mar 2008
Rep: 663 Posts: 383
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
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
Old 08-20-2015, 01:36 PM
hoytedow's Avatar
hoytedow hoytedow is offline
Omnivore Whig
Join Date: Sep 2009
Rep: 2472 Posts: 5,092
Location: North of Cuba
Cool vid, Tiny.
Reply With Quote
Old 08-20-2015, 03:35 PM
portacruise portacruise is offline
Senior Member
Join Date: Jun 2009
Rep: 218 Posts: 945
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..

Reply With Quote
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
Old 08-21-2015, 05:38 AM
Tiny Turnip Tiny Turnip is offline
Senior Member
Join Date: Mar 2008
Rep: 663 Posts: 383
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
Old 09-20-2015, 08:43 AM
Tiny Turnip Tiny Turnip is offline
Senior Member
Join Date: Mar 2008
Rep: 663 Posts: 383
Location: Huddersfield, UK
We knew we'd been buzzed by a drone when pedalling round the north end of Gigha, this summer, and the footage has shown up on youtube. Great footage of Gigha from about 1:35, pedal boat at 2:14. It was a beautiful day.

Reply With Quote
Old 11-23-2015, 09:57 AM
Scheny Scheny is offline
Junior Member
Join Date: Feb 2012
Rep: 47 Posts: 72
Location: Vienna/Austria
Wave interference boat 2.0

Hi guys!
After years on working on the super small "wave interference" boat the design completly changed to something completely different except for the size. As I was always stuck to not being able to plane, I optimized the boat for so long, that it only needed a little push for that. The boat ended up to be a hybrid being very easy to build as everything is done in stitch&glue.

Building is already in progress and will reach completion soon.

You can have a look at:

As this thread is already too long, I made a new one for this boat which can be found in the hybrid subforum:
10 feet human/electric powered runabout
Reply With Quote

Old 12-26-2015, 07:23 PM
MLampi MLampi is offline
Junior Member
Join Date: Aug 2008
Rep: 10 Posts: 74
Location: Bellevue, WA
Daggerboard prop drive available

It looks like Harry Howard has gotten out of the boat building business and is now selling drop in pedal drives using an inflatable Sea Eagle hull.

The prop drive looks like the same one he had been using previously with his Wave Walker boat. It has an internal gearbox using a narrow #35 chain, so no twisting of a chain as is done in the Seacycle or SpinFin.

$835 is a bit pricey, but it is a high quality drive.

Michael Lampi
Reply With Quote

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 -5. The time now is 02:02 AM.

Powered by: vBulletin Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
Web Site Design and Content Copyright ©1999 - 2016 Boat Design Net