X-Mozilla-Keys:
Marc Pedings wrote:
Paul,
Here is some the data I have for the Morse HyVo Chain (source: Morse
Drive Evaluations)
HV408 Sprockets and Chain
Chain Data: 2" Width, 20,000 Lbs. Ultimate Tensile Strength, 2.3 Lbs
per foot
Scenario One:
225 HP
6800 RPM
1.5 Service Factor
25 Tooth Small Sprocket 4.1 Lbs.
57 Tooth Large Sprocket 43.6 Lbs.
.5" Pitch 2" width
72 Pitches in drive
7.306" Center Distance
1048 Lbs. Chain Pull at RPM
995 Lbs. Centrifugal Tension at RPM
Pressure Lubrication Spray to small sprocket required
139 Degrees Wrap on small sprocket
10 Teeth wrap on small sprocket
Wear:
.1752 Inches per foot, allowable wear for Fixed CD
20000 Hours, B-10 Wear for fixed CD
.36 Inches per foot, allowable wear for Adjustable CD
45000 Hours, B-10 Wear life for Adjustable CD
Scenario Two:
160 HP
5400 RPM
1.5 Service Factor
19 Tooth Small Sprocket 4.1 Lbs.
42 Tooth Large Sprocket 25.1 Lbs.
.5" Pitch 2" width
58 Pitches in drive
6.625" Center Distance
1235 Lbs. Chain Pull at RPM
362 Lbs. Centrifugal Tension at RPM
Pressure Lubrication Spray to small sprocket required
148 Degrees Wrap on small sprocket
8 Teeth wrap on small sprocket
Wear:
.2038 Inches per foot, allowable wear for Fixed CD
21000 Hours, B-10 Wear for fixed CD
.36 Inches per foot, allowable wear for Adjustable CD
39000 Hours, B-10 Wear life for Adjustable CD
Of course the sprocket weights given are for solid sprockets. No airplane
person in their right mind would install them without some serious hogging
out. I expect my HV PSRU to be competitive on weight with the planetary
ones. Also a reminder that I'm using 1.5" chain because I don't want
20,000 hour life ;-)
Jeff Spitzer
Jeff orginal design airplane is a very unusual configuration to say
the least so what is good for him may not really be the best for
the average airplane.
Paul Lamar
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