Recent content by bobthebuilder

In the video you can see the knees go up and down as the paddler drives his foot on the paddle stroke side. The resistance wheel is from an old Nordic Track. As designed the rollers push the wheel on the forward slide and are idle on the back step. Reversing the roller on one side allows...

I guess I want to be able to control the drag. That is, so the only source of rewsistance is from the resistance wheel

Good to know. Not aware what my bearings are made of...

This surfski video shows how the paddler's arms and legs engage .

Thanks for the feedback. Well aware of the opposing foot-to-arm force in the paddle stroke. . . a buddy of mine had to cut back on his paddling cos he has a bad knee! ... as well as trunk rotation. Still fiddling with location of the foot rest . . . which is why it's secured with screws, not...

Good question. Resistance wheel goes in the same direction both sides. Resistance wheel swiped from a Nordic Track ski machine; I had to reverse on of the rollers.

Yes, raw wood holes, but 1-1/4" diameter so there shouldn't be muchfriction there; just there to keep the rope from walking off the resistance wheel. The only planned-in friction is the stainless fairlead that directs the rope to the intake pulley

Don’t be misled by the sketch; it’s a 3D system so 2D doesn’t do it justice. All pulleys are apx 90 degrees except the transfer pulley is apx 180

Building a DIY kayak simulator training machine. A rope is tied to each end of a broomstick and runs around a resistance wheel, guided by a system of seven pulleys . The machine works exactly as intended. But I feel there is too much drag. Trying to see how I can reduce the drag,in the...

DIY harry homeowner here. Always building something. Often with an engineering question I need resolved. Most recent challenge: how much sag on a 60-inch 2x3 pine board on edge. [Turns out there's a website to answer this question] So I look forward to picking the big brains on the physics...