Hi guys, Sani and josse, the DB603G which I think is the motor in the G56 prototype has a single stage, single speed blower but as sani said the coupling acts exactly like a two speed blower when properly charted. There is a flat spot or step between 2550 metres and 3250 metres for the 603G using C3 fuel and 1.4-1.5atm boost. It will actually lose speed of around 5km/h between those heights as the blower coupling pressurises but it is not as serious a loss in overall performance as mechanical gears, it's pretty subtle really from the pilot's point of view.
Now the important thing is that calculated projections never include the blower lag for the hydraulic coupling on Daimlers, so you will often see nice smooth speed and climb curves up through the altitudes for Daimlers on charts but they don't actually perform like that in practise. They act just like two speed blowers, but are much better on sustained climb. The cost for this is that they make your oil temperature high when pressurising with hydraulic slippage (they work exactly like an automatic clutch in a car), so until the blower locks up at either side of the altitude step the whole engine is losing a bit of power and running a little hot. Daimlers make up for this with cubic inches and big oil coolers.
The initial supercharger step that josse put in is about right for the real DB603G in practise, but he can take away the second step at 6500m and just play with the curve, there's a figure that lets you alter the curve but I'll have to get out all my FM working material to remember it.
Author
Topic: Fiat G56 Centauro (Read 43052 times)
