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View Full Version : Very interesting discussion: comparison of Merlin vs. D801, DB605



alert_1
08-24-2005, 06:46 AM
http://www.ww2aircraft.net/forum/about2227-0-asc-80.html

________________________________________________Bu t the DB needs at least 2-5 degrees timing ****** if it's not going to start snapping conrods so it loses a couple of hundred horsepower right there. On M4 grade gas. So where it should be producing around 1700hp it actually produces more like 1475hp but it's got over a thousand horsepower almost coming off idle, so that makes a big difference. The Merlin has more output...the DB is a more powerful engine. Funny the way that works, huh?

So there's where the climb rate of 109's comes in. It's not that they can actually do more than say, a Spitfire in a prepared race at maximum outputs, it's that in actual combat conditions they're already moving air more easily to start with. They've got an inherent head start that might not show up on listed maximum specs but would be known by experienced combat pilots.
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alert_1
08-24-2005, 06:46 AM
http://www.ww2aircraft.net/forum/about2227-0-asc-80.html

________________________________________________Bu t the DB needs at least 2-5 degrees timing ****** if it's not going to start snapping conrods so it loses a couple of hundred horsepower right there. On M4 grade gas. So where it should be producing around 1700hp it actually produces more like 1475hp but it's got over a thousand horsepower almost coming off idle, so that makes a big difference. The Merlin has more output...the DB is a more powerful engine. Funny the way that works, huh?

So there's where the climb rate of 109's comes in. It's not that they can actually do more than say, a Spitfire in a prepared race at maximum outputs, it's that in actual combat conditions they're already moving air more easily to start with. They've got an inherent head start that might not show up on listed maximum specs but would be known by experienced combat pilots.
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