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If you take a look at the article I linked, the designer talks about the stability of the Vigillante, which is an example of a reverse tadpole "done right". He distributed the weight so that under full braking the weight distribution was 33/66 fr/rr leading to a stable condition, even under full wheel lock. Impossible to roll, due to the low/rearward CG, and only able to lift the front wheel very briefly under hard acceleration from a stop. Its very low polar moments of inertia minimized the side-load needed on the front tire for turning. Thinking about it further, I suppose it could be said that a tadpole "all else being equal" would have better braking/turning stability, but it's really a moot point if either design has a theoretical tip over limit exceeding the tires maximum grip, since in the absence of hitting something that would tip any wheeled vehicle, rollover is not a concern. As far as performance, under braking a tadpole that distributes 66/33 fr/rr vs. a reverse tadpole that distributed 33/66 fr/rr . . . both should have equal stability. Under acceleration, the reverse tadpole wins, as it can distribute nearly all of it's weight on the rear wheels. A FWD tadpole would shift the weight away from the drive wheels, and a RWD tadpole that maintained 66/33 fr/rr under braking would never have the traction the reverse tadpole would have. |
All great points. That car illustrates very well that despite the theoretical limitations of the reverse tadpole, it is effectively relegated to being a non-issue. On that point, I was clearly splitting hairs. ;)
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Your idea for using a Geo metro drive train is a good one I have been thinking of doing this too. I looked at the Geo metro and it would be easy to drop out the front suspension and drive train complete with steering column. build a frame for a trike around it, add a very light highly Aerodynamic body and 100 MPG should be do able
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