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Old 07-15-2011, 03:51 PM   #1
ybc
 
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Default de h4 4 blade prop

anyone know what these letters stand for AMC 5275 D1 on this de h4 prop.
Bob
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File Type: jpg d 001 (550x483).jpg (49.0 KB, 10 views)
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Old 07-18-2011, 01:55 PM   #2
Bob Gardner
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Welcome to the Forum Bob.

This is the serial number given to the prop by Airco, the Aircraft Manufacturing Company. Geoffery de Havilland was the chief designer and designed the DH4 bomber. AMC made some props for its own aircraft but most were made under government contract, principally by Maple but also by others such as the Integral Propeller Co.

With kind regards,

Bob
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Old 07-18-2011, 04:27 PM   #3
ybc
 
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Default Dh4

thanks for the information.
is there any of way of dating it,apart from the numbers and letters on the hub; it has G 299 N1 stamped on the blades.
Bob

Last edited by ybc; 07-19-2011 at 04:38 PM.
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Old 07-19-2011, 10:27 AM   #4
ybc
 
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Default better pics dh4 prop

better pics of dh4 prop. has been cut in half and put back together with newly made bracket to resemble engine mount.
i am presuming its actually a ww1 prop.
Bob
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File Type: jpg prop1 005 (550x465).jpg (80.5 KB, 6 views)
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File Type: jpg prop1 011 (550x408).jpg (72.8 KB, 3 views)
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Old 07-23-2011, 11:54 AM   #5
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Bob,

The G number is a batch number, here 299, and N1 indicates its the first in a batch of 100. It dates from late 1917.

Your data decodes as;

P3640 Pitch in mm
D3048 Diameter in mm
DRG 2442 The drawing number. It's an Air Board design and the full number would be written as AB2442
RAF3A The engine, a type 3A of 200hp designed by the Royal Aircraft Factory
DE H4 The aircraft type; the DH4 in modern notation. Designed by Geoffery de Havilland, the designer at the Aircraft Manufacturing Company, known as AIRCO

With kind regards,

Bob
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Old 07-23-2011, 03:27 PM   #6
ybc
 
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Default dh4

thanks alot for all the info.
bob
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