[python] Re: inseam fit

Hi Michael,

So is p4.gif still a work in progress, or am I missing something? 

p4.gif is nothing more than a design study, so better do not care
about its measurements. What counts are the real and existing
prototypes p1 to p4.
If I find the time in winter, I will update p4.gif to the exact
measurements of my p3.


If you get a chance, can you measure the distance from the BB to the TEFT (the part of the tire closest to your body) on p3? 

Instead of BB-TEFT, I would prefer to use BB-EOS (edge of seat).
EOS is the point where the front fender (which is obligatory with
the python) meets the edge of the seat plate. TEFT would be about
1.5 cm less. The BB-EOS of p3 is 73 cm.


Trying to modify p4.gif to fit me (inseam 810 mm), and it's going well, except that I just measured the distance from TEFT (trailing edge of the front tire) to the BB as 695 mm, then if you add 170 mm for cranks, that's about 865 mm, which is too long for your inseam, right?

BB-EOS 73 cm + cranks 17 cm makes 90 cm.
This is 4 cm longer than my inseam.
Though this is the perfect size for me.
Why?
Because one also has to consider the lenght of the feet, pedals and the sole of your shoes.


Or do you have any other suggestions for determining a good distance to the pedals? Do you look at the angle of your knee when fully extended, or what? 

Yes. In the most distant position, your leg should not be straight, but
slightly bent. In recumbent forums, people say that you should
determine the length, like you do it with an upright bike and then
add about 5 mm.

Along I send you a picture of p4 with some measurements.


p4:
wheelbase: 113.5 cm
steering angle: 67 deg.
wheel diameters: 24"
seat height: 22 cm
ground clearance: 12 cm
weight: 14 kg
BB-FWA: 34 cm
BB-EOS: 63.5 cm

p3:
wheelbase: 129.5 cm
steering angle: 66 deg.
wheel diameters: 26"
seat height: 30 cm
ground clearance: 15 cm
weight: 18.1 kg
BB-FWA:  41.5 cm
BB-EOS: 73 cm

Attachment: p4_Schlossgarten.gif
Description: GIF image

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