Samstag, 30. November 2013

CAD design #2 in three versions

I changed the lines and measurements of the previous design slightly,
the most important as follows:

Bottom bracket height: 40cm/16"
Seat height: 20cm/8"
Backrest angle: 40° from horizontal
Min. distance heel to ground: 7,5cm/3"
Car body height at crank position: 75cm/30"
Car body height at knee position 80cm/32"
Maximum height of soft top: 105cm/42"
Width: 120cm/47"
Length: 320cm/126"
Wheel base: 210cm/83"
Ground clearance: 12cm/5"
Weight: around 60kg/130lbs (with two drivetrains)

Here are three different versions of my pedal car.
It's basically the same car body with different rear versions, which can be simply attached to the tail.

Basic car


The convertible


The Kamm tail

The pickup

There's still some work to do on the front, which has to be changed.

Dienstag, 26. November 2013

The monocoque in 3D CAD

Did I mention that I want to make the tandem fully faired?
For the first time a non stressed fairing attached to the frame, a further development could be a rigid, frameless monocoque.

To find the desired retro design I prefer, I have played around a bit with SketchUp.
Although I'm not a big fan of CAD, it's useful to see a planned design from different angles before the build starts.
I confess I'm not a skilled CAD designer, but hope to improve my abilities soon.
 Lenght: 320cm/126 inches
 Width: 120cm/48 inches
Height is 105cm, maybe I have to raise the roof a little bit

SketchUp is a rather simple program.
It's easy to use but has just a few tools.
For example the step at the bodys edges should be a 45 degree bevel, but I haven't found the necessary tool.
Furthermore I wanted the front and rear end of the body a bit narrower, but I wasn't able to alter the body of my pedal car that way.

The build will be done with 4mm gaboon plywood ( as the blog name suggests) and epoxy as a stitch&glue project.

By the way, here are the newest parts for the sociable:
Front wheels with 90mm SA drums and one rear wheel with Nuvinci N360
The second rear wheel is fitted with the Alfine11.
I can't decide wich hub is better for our needs, we have to find it out while riding :)