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Comment Re:How a planetary-based IVT system works in gener (Score 1) 609

For me, as a non-engineer, this is quite difficult to get my head around although the example of the differential given above is a useful one. The bit I don't understand is why the secondary motor to control the ratio doesn't require the same power as the primary motor. For example, given the differential set up described above, wouldn't the second motor (where one of the wheels would normally be) have to provide just as much power as the primary at any speed other than full speed (where the secondary motor could be locked)?

I guess the bit I'm missing is how speed but not torque is taken out the system. Anyone care to provide a handy link with some background reading? (Something other than "go get an engineering degree" ;-) )


Submission + - New unmanned Japanese re-supply vessel for the ISS (

Joshua writes: "JAXA, Japan's version of NASA, has scheduled the launch of its new rocket, the H-IIB, for September 11th, 2009. The rocket will be carrying up the first in a series of unmanned supply vessels for the ISS called the HTV. The new Japanese addition to the international space fleet comes as a huge welcome sign to NASA, who has scheduled the space shuttle to retire in 2010. The HTV will be able to transport vital supplies, equipment, and experiments to the ISS, a job that the U.S. space shuttle has been doing largely up until now. Yearly launches for the H-II2 and HTV are scheduled between now and 2015. Until NASA can finish the next generation Ares I rocket, which isn't likely to be finished before 2017, taking astronauts into space and to the ISS will likely become the job of Russia."

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