This is the frame design I am going to use with some modifications. It is a Spitfire which is a later version of the Thunderbird, both designed by Rickey Horwitz. Rickey makes his frames from 6061-T6 aluminum, but I will build mine out of a combination of mild steel and aluminum. The all aluminum bike weights only 28-32 pounds (bare frame is 18 lbs)!!! Mine will be heavier, most home builds are around 50-60 lbs. I decided to draw on other people's experience and not re-invent the wheel for a change. I think there is a pun in there somewhere... Check out the Links section of this blog to see more detail about this and other designs.P.S. This model of trike sells for $3500 US! Most trikes are at least $2500.
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