Item 1032
DESIGN: UniCopter ~
Control - Flight - Swishring - Ring Follower
Drawing:
Bearing to be changed
Notes on Swash-ring:
The arm from the blade should go to both sides of this bearing because of the small axle and side loading.
See [Concerns] on
B344.html
Bearing Capacity Calculations:
FORM: Rotor - Hub - Pitch Bearings ~ UniCopter
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Item Number: |
0757 |
0756 |
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Inside Diameter: |
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Bearing: [Fafner number given] |
2MM9300WI CR |
2MM9301WI CR |
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Bearing: [NTN number given] |
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Quantity and Type: |
2 - Ball Bearing |
2 - Ball Bearing |
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Extended Dynamic Load Rating: [C] |
3450 N |
4070 N |
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Static Load Rating: [Co] |
1625 N |
1900 N |
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Radial Load Factor for the Bearing: [X] |
1.2 N |
1.2 N |
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Axial Load Factor for the Bearing: [Y] |
1 N |
1 N |
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Actual Radial Bearing Load: [Fr] |
21 N (1) |
21 N (1) |
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Actual Axial Radial Bearing Load: [Fa] |
0 N |
0 N |
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Dynamic Equivalent Radial Load: [Prr] |
25 N |
xxx N |
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Basic Rating Life (in millions of revolutions): [L10] |
2565994 |
xx |
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Revolutions per Minute: [nn] (2) |
7558 RPM |
6298 RPM |
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Basic Rating Life (in hours): [L10h] |
5658450 hrs |
xxx hrs |
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Reliability: [rr] |
99 % |
97 % |
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Adjusted Rating Life (in hours): [Ln] |
188275 hrs |
xxx hrs |
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Weight: |
xx lb. |
xx lb. |
(1) For the loading on the bearing see:
DESIGN: UniCopter ~ Rotor Hub - Pitch Bearings22 in-lb / 4.64" radius = 4.74 lbs = 21 N. So far, this value is only the amount to overcome the friction of the pitch bearing. It does not include the greater loading from aerodynamic torsional loads on the blade.
(2) Revolutions per minute: 733 RRPM * 4.64" RADIUS * 2 * (22/7) / ((22/7) * 0.90 = 7558 RPM?
(2) Revolutions per minute: 733 RRPM * 4.64" RADIUS * 2 * (22/7) / ((22/7) * 1.08 = 6298 RPM?
Notes:
Note
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Last Revised: August 2, 2003