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Amphibious Recumbent Tricycle (amphibike) MK3

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Uploaded on Apr 19, 2010

the 3rd and most successful revision of my amphibious recumbent tricycle design.

Features: Retracting drive wheels (when in water) and propeller (on land), 2 wheel drive with limited slip for traction on wet boat ramps, separate clutches to engage/disengage propeller and wheels, 24 forward speeds with extra low gearing, pontoons are kevlar laminate over foam core and displace about 200lbs each and weigh 12lbs each, front wheel doubles as rudder. Main frame is welded aluminum and rear subframe is steel rear triangles of two identical mountain bike frames. Prop gearbox is a modified pneumatic air wrench. Pontoons and struts easily detached for storage. Entire bike weighs approximately 80lbs. Length: 8 feet. Width: 4 feet. Weight could be brought down with further refinement.

Original amphibike ca. 1997-2001: successful but clunky; rolling testbed that underwent many design refinements.

2nd revision ca. 2001-2004: overly sophisticated design failed catastrophically on first ride. Gilligan!.

3rd (current) revision 2005-now: hybrid between 1st and 2nd revisions. Going strong.

Thanks to Mike and Belinda for taking the video.

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