Open Waterbike Cat

We propose Open Waterbike 'prototype 0' as an architectural model.

Its distinctive architectural solution is the 'forward tube' mounting of the drive unit. This architecture can easily adopted also for flex shaft drive systems.

Plese give us your opinion.

Forward Tube Connection

This is the connection adopted by Open Waterbike prototype 0.

It is simple and easy to build. It gave excellent results.

The concept is connecting the drive unit to a forward tube, that can have also the function of structural member in the case of multihull boats, allowing meanwile a kick-up feature. Please have a look at the short video for this. 

The forward tube is located in a convenient location, clear of feet and pedals, but close enough to provide a strong and stiff connection. Please have a look at the image behind for the geomatrical dimensions; a dwg file can also be downloaded.

These are the fundamental and derived measures for the Open Waterbike drive unit geometric interface; the geometry is described in detail in the drawing enclosed.

Fundamental measures

Vertical measures

VCP - crank axle axis to propeller axis: 800 mm [32"]

VCT - crank axle axis to forward tube axis: 225 mm [9"]

ETD - Forward tube diameter (external) european: 50 mm

ATD - Forward tube diameter (external) american: 2"

Horizontal measures

Derived measures

PFA - from pedal (axis) to forward tube axis: 100 mm [4"]

MPD - maximum propeller diameter: 600 mm [14"]

(with a 75 mm [3"] clearance form water level to prop tip)