How is speed derived?

[gdotts]

I think in WWII prop planes, speed a result from RPM and Manifold Pressure "together" but could one be a better or more efficient or preferred use than the other?  Thank you.

[AndyJWest]

High RPM, low MP= safe  (within limits). High MP, low RPM = damaged engine.

Look for documentation on your engine limits. Stick to them.

 

[Hiob]

Think of gears in your car. High RPM = 1 gear. And manifold pressure as you accelerator pedal. You want to be in the right gear. You don’t want to start from the line in 5th gear and give full throttle. Neither you don’t want to cruise down the highway in second gear.

And always keep the right order of operations. If you want to accelerate, you downshift first and then put the pedal to the metal.

Edited June 29 by Hiob

[Qcumber]

Get a simple throttle setup so that you can easily move both throttle and prop pitch. You don't need a fancy throttle for warbirds. I use this one. Very basic but works great. I advance throttle and pitch at the same time. The pitch lever is always about an inch ahead of the throttle to maintain the right balance of rpm and manifold pressure. 

If you turn the Logitech throttle quadrant upside down, and reverse the axes, there is a switch indent which is great for "pushing through the wire boost" for the P-51. It does not work yet for the F4U but I can't get any switch to work so I think this might be a bug. 

https://www.logitechg.com/en-gb/products/flight/flight-simulator-throttle-quadrant.945-000015.html?utm_source=Google&utm_medium=Paid-Search&utm_campaign=DEPT_FY26_QX_GBR_GA_G_DTX-LogiG-Shopping_Google_na&gad_source=1&gad_campaignid=21261229099&gbraid=0AAAAADDQ2OzXXENq9WlBqtzQXbC8b17Lq&gclid=Cj0KCQjwyIPDBhDBARIsAHJyyVjBXCFL0MSgetEQMiS-8mx1hW90Jt4t9hhI5tbEXk31lSiknDImc_waAvvNEALw_wcB

 

[=475FG= Dawger]

An explanation I posted in the Pony forum a year ago

 

You can go faster by increasing propeller pitch (decreasing RPM) at a given MP, but only in a very limited band and not worth the trouble. In combat, you want the prop control full forward so that slamming the throttle wide open has less chance of damaging the engine

[Saxman]

13 minutes ago, =475FG= Dawger said:

An explanation I posted in the Pony forum a year ago

 

You can go faster by increasing propeller pitch (decreasing RPM) at a given MP, but only in a very limited band and not worth the trouble. In combat, you want the prop control full forward so that slamming the throttle wide open has less chance of damaging the engine

In the Corsair you pull the handle DOWN for max RPM, not forward. Depending on whether you're using an axis or the clickable cockpit that can make a HUGE difference.