[954Stealth]

From today's China press conference:

"Q: (Gary Anderson – Autosport) As you were saying Andy, revs, that’s always been the push, everybody wanted to get more revs, more revs, more revs. This year the regulation maximum is 15,000 but on a good day you might see twelve. Do you see that changing, and if it did change do you see that helping the noise?

AC: You’re correct with regard to the revs that we’re running on the track. I don’t see that changing, I don’t see the need for the revs to change to change the noise of the power unit. The principal reason why the engine is quieter is the turbine wheel and the muffling effect that you get from that. That’s one of the key technologies for recycling the waste energy that would normally go down the tailpipe so it’s a key aspect of the technology that we’ve got. There are other things we can do though with the tailpipe, perhaps, to change the noise."


and later....

"Q: (Gary Anderson – Autosport) Could I just add a second part: why is it 12,000 rpm instead of 15,000rpm?

AC: The fundamental reason is the fuel flow rate formula so you get the 100 kilograms per hour once you’re at 10,500 rpm. If you rev an engine faster, you generate more friction and friction is the enemy of an engine and the enemy of a race car because you have to reject it to the radiators and there’s then an aerodynamic deficit from doing that. None of us want to be below 10,500 rpm but none of us want to be at high revs because all you do is create heat.

RW: There’s not much to add. The fuel flow curve, the fuel law is the thing that fixes the engine speed as Andy indicated. We hear a little bit less about the slope below 10,500 than the maximum which is 100 kilos but it is that knee point that fixes the rpm at which the engines make the best power and best efficiency and the engine speed above that is to do with the spread needed to pass the gear ratios.

Q: (Marc Surer – Sky Germany) It’s in a similar direction, my question for the motor engineers: what can you do to increase the noise? There’s a lot of talk about it but I haven’t heard a solution yet.

RW: First thing to say is that the noise of the current engine is a consequence of the overall layout, the architecture and so forth. I think in terms of the possible adjustments to change the noise it makes, I think we’re at the beginning of a consultative process that will kick off in about an hour’s time. Andy’s alluded to tail pipe changes – that’s something that could be a way to go. I think the scope to fundamentally and profoundly alter the noise of the engines is extremely limited by the type of technology that we have deployed and therefore I think we need to be realistic about the scope of any action that we might take but of course we’re sensitive to the subject and we’ll certainly participate in any of the studies that might lead to actions being taken.

PF: I think the engine people in the room know the problem a lot more than I do. I think what Andy said about... you’ve got the turbo there to try and take all the energy that we can out, so it’s always going to be quieter. There’s a round of meetings starting today, in fact, that will discuss and try and work out how to improve the situation."