by The_Toecutter » Tue 04 Aug 2020, 13:51:13
When it comes to vehicle efficiency and embodied energy during production, there is a LOT of fat to be cut.
There's been a boom in electric bicycles as a result of the COVID shutdown, among other factors.
I've personally built something efficient enough to reach nearly 40 mph on flat ground, just being pedaled, no motor. I haven't been able to get some of the parts to finish my prototype as a result of the complications relating to COVID19, even though I ordered them months ago. A lot of people are realizing they can no longer afford their cars with mass evictions looming and mass unemployment now a long-term feature of the economy.
I see potential for a boom in microvehicles in the near future, whether it is velomobiles, microcars, or something in-between. With 3D printing technology advancing, there is the possibility that in the near future, economy of scale will not be as much of a determinant on the per-unit cost of a vehicle as it has historically been, which would allow such vehicles to then be produced for greatly less cost than the typical automobile, even in low volume, which would then provide an affordable alternative.
There is no reason a single-person enclosed motorcycle couldn't do the same things most people currently use cars for, but at less than 1/20th the environmental or ecological impact. Mainly, a single occupant using the vehicle for A to B transportation, pickup up groceries, and doing so in a manner that isolates the user from the elements. With the right design, one could safely operate at highway speeds on only one horsepower, and get the energy efficiency equivalent of thousands of miles per gallon on electricity doing so.
A single-person electric car that needs one horsepower to do 60 mph would only need about 13 Wh/mile from the battery, or close to 2,500 MPGe. Or if one uses an ethanol fueled engine or a diesel engine instead of electricity, literally getting 1,000+ MPG is possible. Such a vehicle, unladen, would weigh under 200 lbs, and have a CdA of under 0.05 m^2. With regulations on low-volume vehicles and motorcycles being so lax in the U.S., it is feasible that a small startup could produce something like this and avoid liabilities stemming from safety. Hand-built, it won't be cheap, but with access to the right tools(3D printer for the body, automated tubing bender for the chassis, ect), potential for a cost comparable to that of a scooter or a mid-range ebike is there. With careful selection of components, such a vehicle could also reliably perform like a car, or even faster...
There exist vehicles barely similar to what I describe, like the Twike. In low volume with lots of high-cost hand labor and low-volume custom components involved, they are also expensive. The Twike is also meant to seat 2, side by side, which compromises efficiency greatly. But the potential to improve the designs and to cut the cost is certainly there.
The unnecessary felling of a tree, perhaps the old growth of centuries, seems to me a crime little short of murder. ~Thomas Jefferson