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Old 04-02-2018, 12:15 AM   #11 (permalink)
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Originally Posted by Frank Lee View Post
Let 'em be "unsynchronized"- twin engine aircraft make no attempt to phase crankshafts; matching rpm is sufficient.
This makes for much less headaches.

Car and Driver featured a twin-engine CR-X over thirty years back. To get it to work properly, they simply linked both engines to the same gas pedal and let the automatic transmissions match speeds through the road.

That car did 0-60 in 6.2 seconds using two 1.8 liter engines mated to four-speed automatics. Pretty nuts.

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Old 04-02-2018, 12:18 AM   #12 (permalink)
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Yes, but the torque converters smoothed out the differences. Manual transmissions don't have that buffer. I remember that article. It was a 1984 Gen 1 CRX with the rear axle replaced by a second engine/transaxle, with the steering locked on the rear engine. The two engines came from Accords.

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Old 04-02-2018, 02:12 AM   #13 (permalink)
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Originally Posted by Angel And The Wolf View Post
Maybe, the easiest system would be to place the two engines behind the rider, and join them physically, 90 degrees apart, with a double sprocket idler shaft, and drive a single rear wheel, making it a twin engine trike. Slightly lighter, easier to turn, and easier to license. The reason for connecting the engines 90 degrees out of phase is to have 4 instead of 2 power pulses per revolution. Smoother, and sounds better.
(Something like this

I wasn't refering to a reverse-trike. Well, I'd like to see how the CVT in each scooter motor could provide some compensation analogue to the differential effect, or if it would need some other way to do that.


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I believe some twin engine aircraft DO mechanically join the two props, so that one engine can turn both, if the other goes out.
It's not viable to couple both propellers to only one engine in a twin-engined aircraft. However, at least in the Piaggio P180 Avanti the propellers are so close to each other that it may lead to an impression that both propellers could move during single-engine operation.
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Old 04-02-2018, 03:18 AM   #14 (permalink)
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It's not viable to couple both propellers to only one engine in a twin-engined aircraft.
Maybe I was wrong on that.
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Old 04-02-2018, 03:23 AM   #15 (permalink)
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Why not two big engined scooters instead of two manual bikes?
Seems like you are trying to do things as difficult as possible. (not judging, everyone can do what they want as a hobby )

Do you have two bikes somewhere or are you going to purchase them? I'm interested in seeing how this turns out.
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Old 04-02-2018, 03:41 AM   #16 (permalink)
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Originally Posted by cRiPpLe_rOoStEr View Post
I wasn't refering to a reverse-trike. Well, I'd like to see how the CVT in each scooter motor could provide some compensation analogue to the differential effect, or if it would need some other way to do that.
I would think you could freewheel each wheel, and let the outside wheel coast around the corner. I wouldn't do that on a four wheel motorcycle because at higher speeds, I'd want engine breaking. A trike solves that.
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Old 04-02-2018, 03:43 AM   #17 (permalink)
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Why not two big engined scooters instead of two manual bikes?
Seems like you are trying to do things as difficult as possible. (not judging, everyone can do what they want as a hobby )

Do you have two bikes somewhere or are you going to purchase them? I'm interested in seeing how this turns out.
No, this is just a mind exercise. My ideas are far larger than my bank account. (DAMMIT!)
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Old 04-02-2018, 04:30 AM   #18 (permalink)
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Originally Posted by Angel And The Wolf View Post
I would think you could freewheel each wheel, and let the outside wheel coast around the corner. I wouldn't do that on a four wheel motorcycle because at higher speeds, I'd want engine breaking. A trike solves that.
You don't want engine breaking cuz then you're down to one boring old engine.

Siamese two V-Max' and you won't have to worry about differential action.
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Old 04-02-2018, 05:21 AM   #19 (permalink)
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You don't want engine breaking cuz then you're down to one boring old engine.
No, I didn't mean "break an engine" I meant leaving the engines engaged and down shifting to let them drag the trike down from speed.
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Old 04-02-2018, 05:37 AM   #20 (permalink)
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Oooooh, braking! Why didn't you say so?

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