Picture of Sit On Kayak Pedal System
Made from a sit on kayak, a bicycle, weedeater and assorted parts, this water-craft is relatively easy to build, great exercise and fun!
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Step 1: Gather materials

Picture of Gather materials
1 sheet of 2" blue insulation foam (4 ft X 8 ft) (or sit-on-top kayak)
1 bicycle (or 'Big Wheel' trike)
1 old 'Weed Eater' or weed whacker of any make
1 wooden or plastic model aircraft propeller (mine's 18 X 12 but somewhere in the range of 10 X 10 to 16 X 16 should do)
1 3/8 drive 90 degree drill chuck
various and sundry wood and metal bits to connect it all

Step 2: Construct Foam Pontoon Boat

Picture of Construct Foam Pontoon Boat
Insulation foam is relatively easy to work with and makes a utilitarian pontoon boat. (working on Instructable for my new design)
Alternately follow these directions (Dual-Motor SIP&PUFF Controlled Kayak System or

Step 3: Construct Propeller Assembly

Picture of Construct Propeller Assembly
Disassemble "Weed Eater" to get to the flexible shaft assembly.
Remove the weed whacker head and attach propeller.

Step 4: Mount Bicycle to Pontoon Boat

Picture of Mount Bicycle to Pontoon Boat
Use bamboo supports to mount bicycle to pontoon boat

Step 5: Position Propeller Assembly

Picture of Position Propeller Assembly
Position and mount propeller unit to the bicycle/pontoon boat assembly using U-bolts to clamp it in place

Step 6: Pedal Away

Picture of Pedal Away
Find a pond/lake/river deep enough for your boat/propeller and pedal away!
(Pictures of finished project ASAP!)