gman1971 wrote: ↑
Sep 04 2019 11:26pm
the suspension adds quite a bit of radius to the wheels turning...
Indeed it does.
The fact that you've made your build work as in the picture you've shown AND got the clearances right is impressive. Even with computer modeling, that's not easy to do, because you're dealing with a lot of imprecise data and perhaps even outright guesses regarding how the pressure in the shocks effects all of the relevant operating parameters.
This suspension kit made it all possible. I'm really wondering what the rear suspension is going to do to my vehicle's dynamics after adding it. Adam said in another post that the rear suspension added more to the stability of his machine than the front suspension! I'm sure the extra few inches added to the wheelbase helps.
Any idea regarding your maximum "safe" cruising speed on this new iteration? Whatever it is, I'm sure the rear suspension when placed on your next build will improve it significantly.
The geometry of this front suspension and how variables such as air pressure, mass, F/R mass distribution, rider weight, body clearances, tire size, and everything else effect whether everything will work with inboard wheels is sufficiently complicated that I decided to just keep it with wheels outboard of the main faring, and went ahead and started making some aluminum farings for the wheels that mount to the suspension arms and therefore move with the suspension arms(I've got one of them about 90% complete and tested it, the other one is in the works). The way I have it envisioned, it will look something like the Birk Butterfly from a top-down perspective, and like an Aptera 2e from a side-perspective, with aesthetic cues from the Infiniti Prototype 9. There will be a metal "slinky" shaped like a teardrop between the aluminum wheel faring and the main body faring, that will have spandex webbed over it, for each side(with the intent later to make flexible rubber boots), which can move up and down and side to side as the steering and road conditions demand, while providing an airfoil shape over the suspension arms. This should allow me to keep frontal area down nice and low while keeping drag coefficient down, without causing clearance issues during cornering even while going over bumps. Going to a 20" wheel in the rear would also be enabled by the rear suspension, which in turn would allow me to recline the seat further back, further reducing frontal area and lowering the center of gravity yet more(the seat on mine is as far forward as possible and reclined as far as it can be without causing a clearance issue with the current 26" rear wheel) while extending the wheelbase.
The potential to get a frontal area approaching downwards of 0.5 m^2 on a KMX with Adam's front suspension installed does exist, in spite of the 39" front track. That front track really helps its cornering and I would not want to give that up in the name of drag reduction, but there ARE ways...
With a sufficiently low center of gravity, Adam's full suspension on this trike could make it corner very car-like in a sharp turn. The Campagna T-Rex tadpole motorcycle/car can exceed 0.9G on a skidpad without any tendency to tip over and instead skids when traction is lost, and with the right setup, I think Adam's kits on the KMX could be made to perform similarly. And it would be delicious. Consider that most commercial velomobiles will tip over around 0.5G lateral.