On 03/04/2016 21:44, Vir Campestris wrote:
On 02/04/2016 18:01, Roger Mills wrote:
Of course there would. It would only be at its max value at the max
torque point itself - which may actually cover a range of speeds since
some engine torque curves are flatish rather than peaky at max torque.
We're talking about a dynamic rather than static situation anyway.
Acceleration is the RATE OF CHANGE of speed and is a continuously
variable function. If you're defining acceleration as a step change in
speed it's little wonder that you're living on a different cloud from
everyone else.

Maybe I need to change A1 for your benefit, thus:

A1: By using full throttle and allowing the car to accelerate over a
speed range which encompasses the max torque speed of the engine.
Maximum acceleration will occur as the engine passes through its max
torque point.

[In actual fact, it may not! As the car speed increases, the aerodynamic
drag increases as the square of the speed. The effect of this - which we
have so far ignored in this discussion - is that maximum acceleration
MAY occur slightly below the max torque speed because the increase in
drag may more than offset the increase in torque.]

I've given up on Plowman, he must be trolling. Or too embarrassed to
admit he's wrong.

Your A1 as it is written is perfectly true, but irrelevant for performance.

Yes, I'm aware of that - and was simply trying to explain to Mr Plowman
that his assertion only applies if you restrict yourself to one gear.

To get the greatest acceleration for a car you need to maximise the
amount of power that the engine generates.


Yes, indeed. That's what I've been saying all along. That's why I gave
the example of using a continuously variable transmission to hold the
engine at its max power (*NOT* max torque) speed as the car accelerates.

It's obvious when you consider that power = thrust x speed. At any given
speed, the higher the power the higher the thrust.
--
Cheers,
Roger
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