P-51D "Lou IV" and pilot lost
Join Date: Aug 2003
Location: Sale, Australia
Age: 80
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Perhaps an explanation lies here. The USAAF manual lists 45" as the normal take off boost (but a max of 61" is available) and I would assume a civil owner would want to take care of his machinery ie use the 45" in the normal course of events. The go around procedure like wise calls out Advance throttle quickly but smoothly to the normal take off manifold pressure of about 45". Caution: Don't jerk or jam on the throttle. Avoid sudden bursts of power. Use all controls smoothly.
Maybe in the heat of the moment he made use of some of the extra 16" available and explored what to him was unknown territory.
Maybe in the heat of the moment he made use of some of the extra 16" available and explored what to him was unknown territory.
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Join Date: Feb 2005
Location: flyover country USA
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Since my curiousity was piqued regarding the Merlin gear ratio, I did a bit of search and find two different ratios (or more?) were in use. The standard for the P-51 installation was apparently 0.479:1 - and the document I found is most interesting! See: http://www.caa.co.uk/aandocs/22231/22231000000.pdf
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The Mustang used a number of different versions of the Merlin as follows.
Merlin V 1650-3 with a gear ratio of .477, the -7 and -9 ratio .479
The -3 and -9 had the same supercharger drive ratios (6.391/8.095) as well where as the -7 were different (5.802/7.349). Naturally this meant that all three engines had different power ratings.
Merlin V 1650-3 with a gear ratio of .477, the -7 and -9 ratio .479
The -3 and -9 had the same supercharger drive ratios (6.391/8.095) as well where as the -7 were different (5.802/7.349). Naturally this meant that all three engines had different power ratings.
