Question to frame builders.

BalorNG

10 kW
Joined
Nov 10, 2019
Messages
516
Do twin spar/trellis frame make sense in case of a lack of stressed motor member? As I understand, you don't want a battery box to be a stressed member.
Obviously monocoque would be best, but a bit complex, ahem.
My goal is rather... unorthodox to be frank:
https://endless-sphere.com/forums/viewtopic.php?f=6&t=117828

It is obviously bolted together contraption, but you can see the basic shape - it should look like XYZ spaceframe bike with recumbent configuration when all is said and done (well, hopefully), with some non-structural fairings and batteries (lifepo prismatics) inside the 'lower compartment'.

http://www.xyzcargo.com/cycles/

The design seem to be working, but I wonder how much reinforcement should be 'between' the spars. My construction as of now is considerably 'wobbly' - otoh 1.5" tubes (thinwall steel) make for very poor 'spars' due to tube being one of the actually worst shapes when it comes to beam in basically pure beinding, not torsion per se.

Anyone can offer some pointers? I can understand that taking one XYZ one step further to double trellis spars should make things considerably stiffer.
 
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