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propellers 008.jpg
Jim Allen

propellers 008.jpg

C-20 beryllium copper (copper alloy C82500) blades are hardened in a heat treating oven. Props are held at 650 deg. F (+- 5 deg F) for 2.5 to 3 hrs. The time in the oven is not critical, but the temperature is to achieve the ultimate tensile & yield strength. The tensile strength should be 160,000 psi with a rockwell hardness of 45. These blades will not bend & cannot be repitched without annealing.
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propeller details
Added by
Jim Allen
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Image metadata

Device
OLYMPUS IMAGING CORP. D595Z,C500Z
Aperture
ƒ/3.6
Focal length
10.9 mm
Exposure time
10/600
ISO
100
Flash
Auto, fired
Filename
3619-1122255046-propellers 008.jpg
File size
63.6 KB
Date taken
Wed, 20 July 2005 9:13 PM
Dimensions
640px x 480px

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