Openergo A selfbuild rowing machine For more details

Openergo A self-build rowing machine For more details go to http: //openergo. webs. com or contact jimflood 42@gmail. com All the drawing are available as Google Sketchup files

Basic frame structure The parts are fixed together with wood screws

Parts list C B K A (two required) D F (two required) L E (two required) H G (two required) J

Timber parts list Parts A, F and G are from 100 mm X 50 mm section timber, all the rest are 70 mm X 50 mm F (Two required) A (two required) G (two required) Cut angles are 60 degrees and 30 degrees unless shown differently End detail of B B Groove for the chain guide D E (two required) L 42 degree angle K C H J 12 degree angle

Hardware components This plate carries the spindle of the bike wheel and is made from 2 mm steel or 3 mm aluminium. The slot is cut to fit the spindle. Wheels for the seat – four required, minimum of 50 mm diameter. 1. 5 metres of shock cord (aerolastic). A bicycle wheel inner tube sliced along the length is a good substitute. 200 mm of 50 mm diameter wooden dowel for the handle. This can be carved from square section timber. Pulley wheel for the shock cord. About 50 mm diameter An 1. 8 metre length of bicycle chain to fit the sprocket or cassette fitted on the wheel. This is longer than a standard bike chain so two will need to be joined together. 26 inch rear bicycle wheel fitted with a small sprocket or gear cassette.

Holes drilled at these points for screws to fix the rim to the fan The impeller fan is made from 10 mm plywood. With a standard 26 inch bicycle wheel there are nine slots where the spokes are parallel which allow the vanes to fit through. The impeller will need to be adapted to the particular bicycle wheel used. The vanes are screwed and glued to the back plate. Holes are drilled through the rim of the bicycle wheel to fit screws through into the ends of the vanes. The sprocket or gear cassette fits on the opposite side of the fan to the vanes.

The shock cord is attached to the end of the chain by twisting wire around – cover with tape to avoid it catching on edges. The cord runs around the pulley then back to the front of the frame. The chain drive to the impeller Some of the pictures show the impeller fan inside a cover. The cover does not need to be as complicated as the one shown – but a cover is need to protect users from coming into contact with a fast-moving impeller. A free-standing box cover would be okay for this purpose. The handle and chain