[python] Latest Drawing: vp1.gif

Hello All,

Once again, I am up late working on the Vython design, when I have to get up at 4:20 am...

So here is the latest (it's big -- 2000 px by 800 px, so save and view in something besides your mail program for better quality):

GIF image



Here is the problem: see the huge white circle? That's the EoS (edge of seat) circle centered on the BB, the radius is 680 mm (my inseam is 50 mm less than Jürgen's, 810 mm - 170 mm + 40 mm = 680 mm). The big green circles represent the two sizes of tires that I'd like to be able to use: 32-507 and 44-507. The problem is that the EoS circle is about 26 mm short of where it should be. So I need to shorten up the front a bit I guess?

Here are the measurements:

vp1.psd / vp1.gif

Based on photoshop canvas size of 2000x800 px
Scale 1 px = 1 mm

vp1 wheelbase: 1170 mm

32-507 tire: 576 mm dia
44-507 tire: 590 mm dia
hubs: 40 mm dia (arbitrary)
skewers: 5 mm dia
        (center of rear tire located at 305,505)
        (center of front tire located at 1475,505)
1.5" tubing height = 38.1 mm
0.5" tubing width = 12.7 mm
seat support fork width = 20 mm
BB shell width: 35 mm
steering angle: 70 deg
BB - EOS: 680 mm
BB - FWaP: 410 mm (418 mm in vp1.psd)
C - FWap: 320 mm (312 mm in vp1.psd)
BB - C: 730 mm
Y: 180 mm
G - BB: 910 mm
rear frame member: 708.3 mm -10.2 deg
ground clearance: 150 mm

So one obvious thing is that I made BB - FWaP 8 mm too long, but that still leaves me 18 mm short... Hmm. Part of the problem is that I made the steering angle 70 degrees instead of 65 degrees, which puts the BB further away, I might have to abandon that and return to 65 degrees.

Any suggestions?

If anyone wants the photoshop file (each part in it's own layer, named and color-coded), go to my yahoo briefcase account:

http://briefcase.yahoo.com/bc/mrienstra@xxxxxxxxxxxxx/lst?.dir=/public/ Vython

I erased the old stuff, it was junk, now it's just vp1.psd, vp1.gif, and vp1.txt (the measurements I gave above).

Michael

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