Crump,
The altitude in question, as I have repeatedly stated, is Sea Level.
I find it funny how on this board the German aircraft just get better and better and the Allied aircraft, particularly British, get ever worse and slower. Now we have the much loved by its aircrews (more so than even the Spitfire) Mosquito being portrayed as a slow deathtrap and the statements from myself an others being intentionally misinterpeted as claiming it to be a great air superiority fighter despite by specific example to the contrary. I specifically said that the Mosquito was not a match in aerial combat. All it had over the German fighters in 1943 and early '44 is the ability to run, and that was a near thing. As to boost duration, the Mosquito was limited to the typical five minutes of emergency boost, though its crews undoubtedly ignored that at times as pilots of all aircraft in all nations ignored such things. In AH it is strictly limited to five minutes whereas the German fighters, besides being faster to begine with, are given 10 full minutes of emergency boost.
At the 2001 AH Con there was a pilot there who spoke. He flew Spitfire Mk Vs, Mk IXs, Mk XIVs and P-47Ms in combat. He flew a Mosquito once, service trials after it had been repaired. He said that what he remembered was that it was very fast. When flying Spitfire Mk IXs his squadron was once tasked with excorting Mosquitos. He said it was the stupidist mission he ever flew as the Spitfires had to be at full throttle just to keep up with the Mosquitos on cruise settings. Those are some odd impressions os an aircraft that was so slow given that he flew Spitfire Mk XIVs and P-47Ms as well.