What are the default beam properties

I believe these are the defaults that will be used:

if vehicle.options.beamSpring == nil then vehicle.options.beamSpring = 4300000 end
if vehicle.options.beamDeform == nil then vehicle.options.beamDeform = 220000 end
if vehicle.options.beamDamp == nil then vehicle.options.beamDamp = 580 end
if vehicle.options.beamStrength == nil then vehicle.options.beamStrength = math.huge end
if vehicle.options.nodeWeight == nil then vehicle.options.nodeWeight = 25 end

 

Yes, sorry it was late for me to make a detailed post. But if you look at jbeam_main.lua lines 736 and 1897 you will see how these values can get applied to the beams. At least it looks that way to me, I had to check it out myself when I saw your question