So - I noticed someone had hot wheels that were open spoked so I got one and shaved the wheel thickness to about 1/16" leaving the hub at full thickness. I went back to a tail wheel doing the same thing. Being a raeelly nasty day out I'v only been able to do proof of concept using about a 35 foot open section across the livingroom and recroom. I also made a total of 14 feet of take off track. I have successfully launched both the biplane and mono mod. (I also hit a table one second later - but AaAah addiction and obsession made it necessary). I think this may be my last wheel building.