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Aragonis, where I live in the US, I can scratch build a 3 wheel car and it is considered a motorcycle by our legal authorities. As Ken Fry posted earlier, if I add the 4th wheel the regulations change completely, including my having to provide several examples for crash testing and emissions testing before I could ever sell one to the public.
That is why I am building one with 3 wheels, as well as the fact that my scratch built prototype drive system will only require one example in the rear instead of two.
Cost to me to built one vehicle, probably $30-40K. Cost to build a 4 wheeler from scratch, probably several hundred million dollars.
One is doable, the other is impossible. I like to stick to things I can actually accomplish.
regards
Mech
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