[python] leverarm propulsion failed

Hi Brechtix, Jürgen and all others,

thanks for your response.

Now I know, why the leverarm propulsion is harder to drive. It is so 
simple that I wonder why I did not recognize it earlier. compared to a 
usual bike (both with the same transmission of 3)

My python has a leverarm of 330 mm and the rope is fixed to the crank 
at 290 mm. If I push for example with 500 Newton on the pedals, the 
rope will transmit 569 N to the wheel.

A crank is 170 mm long and a 42 teeth chainwheel has 82 mm radius. 
So 500 N pushed will transmit to the wheel 1036 N.   Wow!

Imagine a 76 teeth chainwheel on the cranks how difficult this would be 
to push.

That's why it is so hard to push and why the leverarm drive and the 
linear drive have no succes.  I wonder, why the rowingbike from thys is 
so popular in holland. But he moves legs and arms more than 340 mm 
back and forth. 

What a pity. I could have had a stepless shifting with my leverarm-
python. But I don't want to loose  nearly half of my power in the 
transmission.

So soon I will start to build a chain-drive python. Until than I will drive 
hundreds of km on my leverarm-python.

Greetings from Jürgen from Giebelstadt
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