For Sale

Below are custom parts suited for human powered boats.

Contact me if there are simple parts you can't find that would make your boat project more successful.

1.  5/8" constant diameter quarter square crank shaft
$50 USD 

Using bike parts can be a great way to get started, but almost all are steel and have other features that are not optimal for boating applications.  This is an alternative with several mounting options!

Specs: 7075 Aluminum, ground finish
           .625 +/- .0005 inch diameter tolerance
           J.I.S. square taper ends
           5.95 inch overall length

Note: This is not intended to be used for any on-land bicycling applications.  Aluminum is capable of transmitting torque for a propeller in water driven by human power.  Buyer is responsible for determining suitability for a particular application.

Some international shipping locations will be accommodated.  Contact me if you are interested.  All payments will be processed via PayPal.

Cory Schaffhausen
Constant Change Design LLC
cschaffh (at) yahoo.com