Throwing some light on rates of turn

[MiG-3U]

Originally Posted by Crumpp

The RAE's use of a single chart given the absence of any differientiation between power levels makes perfect sense with the Merlin XX predictions.

The Merlin XX was predicted to maintain similar power from sea level to 20,000 feet.

1020 Hp at Sea Level and 1075HP at 20000 feet:

http://www.enginehistory.org/members...a/Table-04.jpg

http://www.enginehistory.org/members...lysisR-R.shtml

1. The Merlin XX had a two speed supercharger. The first page you refer gives power at high altitude gear at sealevel due to analysis. See the appendix A at bottom of the second page for power at low altitude gear at sealevel.

2. Even at constant KEAS speed and constant power, the resulting force, thrust, decreases when the altitude increases because force is power divided with true speed. To maintain given angle of bank at given KEAS, power must increase with altitude.