OK, I am going to reveal the secret of this build so you guys can give some input about the configuration before it becomes finalized.
This trike will use 4 Astro Flight motors. Two 3220s and two 3215s. It will be (are you ready?) AWD.
The front wheels will each have one 3215 and the rear will use two 3220s. It will run four of the new HV160 ICE controllers. The 40AH of lipo are 35C. This thing should pull 800 amps for a second, then settle into 600 to 700 amps for another 3 seconds before it winds out at about 65mph. I have done the math and the trike will weigh about 290 pounds with me on-board. It will have 40hp on tap. That is the power to weight ratio (and roughly the same traction) as a shifter-kart. Those karts hit 60 in under 3 seconds. So, I am assuming about 3.5 seconds from 0 to 60mph (0 to 100kph).
Here is the layout;
The front wheels will each have a disc brake and a sprocket (just in-board of the disc brake). Then there will be one of my single stage drives using a #25 chain instead of the belt for power handling reasons. Every wheel will have a freewheel. So, it will still be pedalable in case something happens and I need to pedal home. I think it will be terrible to just pedal around.
I have been in communication with race car drivers, RC car record holders, engineers, etc, etc, etc, and the AWD should be fine. I have done torque steer tests (hitting left and right brakes independantly going backward to simulate differential accelleration traction) with good results. My only concern is not torque "Steer" but torque "Veer". I am not worried about the bars pulling out of my hands under torque. But, I am a bit concerned about the trike pulling to one side if one front tire bites alot harder than the other. This should be ok, however, because there will only be about 6500 to 7000 watts on each front tire under accelleration. That should not be enought to get out of control from traction differential. But, you never know untill you try. This is a totally weird setup and I am a bit concerned about safety. So, to that end, I am puting more safety features into this trike than any previous build.
Also, with all wheels having freewheels, it should steer smoothly under normal driving as well as power drifting while smoking all 3 wheels.
One HUGE benefit of individual drives at each wheel is the ability of over driving or under driving the front wheels compared to the rear. If the rear wheel is geared a touch taller than the fronts, the trike will oversteer a bit. If the rear wheel is undergeared versus the fronts, it will understeer a bit. This is a fantastic tuning tool that is otherwise not available with such a simple chassis layout.
I am pushing hard on this project. But, it may not be done for months yet.
I am fitting the drive units today to check for clearances. I am also comissioning the CNC battery boxes today as well.
Oh, also, the motors will be wound for 13,000 RPM rather than the previous 11,000 RPM of the motors on my previous trikes. So, not only does this thing have nearly twice the motor power, but 18% more RPM. That added RPM, combined with lower overall gearing will give over twice the actual power (torque) at the wheels than my previous trikes. It will, then, have 3 times the traction available. My previous trikes hit 50mph in 4.5 seconds. Therefore, I think it is safe to say this one should hit 60 in 3.5 seconds just looking at the numbers.
One problem, though; This is such a new layout, It may accellerate in such a funky manor (darting left and right rather than going straight) that it may not be a feaseable setup. If that occurs, I will simply remove the front wheel drive portion of the setup and have a RWD trike that happens to be wider and longer for better hanlding than my first trike setups.
Lets hope it willl track straight. I REALLY want this thing to succeed.
We shall see, my friends, we shall see!
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