Efficiency, getting real data

[Oran]

I’ve been thinking and I recon this is exactly the sort of test that needs to be done. I would like to verify that the graph provided by Fallbrook is accurate. Questions such as, is the drop in efficiency in underdrive due to increased torque, could be answered.

However this shouldn’t be the only test as I think real world data is just as important even if it can’t be as accurate. Having read the Rohloff website and then realised that a CVT adds another level of complexity I began to wonder if real world data isn’t the best.

I totally agree with you on the method for getting data and I also agree that the exact power loss isn’t important. Unfortunately I don’t have all the equipment needed. What I do have is a homemade permanent magnet alternator that’s waiting to be made in to a wind turbine. I believe I’m right in saying that because the alternators stator contains no steel the mechanical power can be calculated. Some sort of large variable resistor would be needed to regulate the power dissipated. The best motor I have with any kind of speed control is an electric drill and the power will have to be monitored with a plug in energy and power meter.