I do not agree.Why not build a single useful eBike rather than piss money way on mediocre builds? I'm amazed by the amount of money spent on bad builds.
You can buy yourself a 100,000 dollar car and when it does break down pay for a taxi. Or buy several cars some for speed , some for cargo and some for dirt roads and hop in what you need. It is similar to what I am doing. My Giant Roam is a 2016 model and in brand new condition with dual 500W e bikeling motors but is only good for smooth flat roads. My 20" BMX with an 1,800W brushless motor will run much better on a bike trail or dirt roads, My new dual motor build is good anywhere and can add a detachable cargo basket when needed.
My Currie will have a super quiet Bafang on the front and a 30 mph capable rear motor if I put 53V to it and can also do back roads and cargo so is basically a back up for my current dual motor build. My 20" Turbo with the 800W DD hub motor on the rear is an all around 22 mph city or country bike and very reliable.
Two motors each of which can run the bike > 25 mph and < 30 mph on their own @ 36V and between 35 and 40 mph at higher voltage can work together which will enable them to share the load going up hills and maintaining a high cruising speed of approx. 28 mph for a long period of time.
An old 10S - 10P pack to the rear and a new 10S - 8P pack to the front for now and two controllers and separate wiring to share the heat is just as good as a single 2 kilowatt motor and even better as if one motor , controller or battery pack fails I can still make it home with the other system.
I am still considering a 3 kilowatt motor for my Haro V3 and a MAC or BMC for my 700c hybrid and not completely given up on a Cro - motor (HUBZILLA) for my 27.5" Silver Dimond Back. , , , but for now this dual motor build will be my main e bike for the summer and on long dark bike trails will be running a 1,700 lumen front light with it's own 12V pack.
If it works the way it should I may not build another e bike for a long time and start saving for an electric car conversion instead.
I looked at that link and is way more complicated than what I am capable of. DA would be able to plug in the variables better than I. I just know about total power of both motors or P2 and top speed possible according to the rpms of the motors. Top speed depends on gearing and total power.A quarter mile high is 400 meters, but what is the length?
Go to https://ebikes.ca/tools/trip-simulator.html and click on input and use Google maps.