Thread: Orbis Wheel
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Old 08-09-2019, 12:39 PM   #31 (permalink)
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Originally Posted by Taylor95 View Post
I would say the mpg increase would be closer to 50-75% depending on the vehicle. These wheels add 100 hp, which is very significant when you consider that most engines make around 160-180 hp at the crank. That would end up being like 125 or so hp to the wheels. Your engine would have to work half as hard to maintain 60 mph. What if your mpg increased to say 110 mpg? Then would it be worth it?
Are we talking about an F150? If you have all of the numbers, you can use this to calculate how many horsepower your car needs:

I could not find all of the numbers for an F-150, so I am just quoting this:
Originally Posted by darcane View Post
Power required to overcome aerodynamic drag is proportional to velocity cubed. If you know how much power is needed at a specific speed to overcome aero drag, you can figure it out at other speeds.

If it takes 12hp to keep your car going at 60mph on level ground (assume 10hp for aero, 2hp for rolling resistance) you'll need 24hp at 80mph and 46hp at 100 just to overcome aero drag.

Rolling resistance is directly proportional to velocity, so it would be about 26hp and 50hp total, respectively.

I do not know for what weight vehicle the 12 HP figure would be accurate, but let's take my 1,075 kg and 115-pound HX, remove the back seat, drop in a 540 kg Tesla battery, and now I have a 1,615 kg 225 HP 2-seater that needs a suspension upgrade.

Now I need 18 HP at 60 MPH and... what is the point of a car like this? To need to fill up and charge, which I really do not think you would want to do at the same time?

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