[python] Re: BHP update and new PC 2
- From: Ray Schumacher <mtb@xxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Fri, 23 Sep 2005 08:04:26 -0700
At 02:19 AM 9/23/2005, you wrote:
Dirk recently mentioned that the front part of Marcs python is
more stable than the 30 x 10 mm frame of his baby python.
This gives a good hint about the correct dimensioning.
One of the things that the motor/battery pack I installed really
highlighted was the torsional flexibility of the frame. I would think
that the front frame designs made with old chain/back stays rather
than rectangular tube are less prone to twist. A hybrid method with
large round tubes from pivot to front axle, and 1.5x.5 there to the
BB would be stiffest. Using round rear frame main tube would help as
well. I can see both ends of mine twisting with the high-mounted 35lb
battery pack.
Torben, I like the aluminum seat design; but I'm guessing that you
don't have an aluminum wire feed welder, since you used tabs. I made
mine by just bending the edges down, but which does not allow a lot
of curves. The attached cushion can also be a bit warm.
Ray
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