Item 1161
DESIGN: Dragonfly ~
Rotor - Disk - Coning Angle
Outside Helicopters
For values of other helicopters see;
DESIGN: SynchroLite ~ Rotor - Disk - Coning Angle
Dragonfly
Coning Angle, Mass and Moment, Based on VR-7 Blade:
This is from 1 disk and 1/3 the gross load (i.e. hover), from Access blade element calculations.
It is based on a tip weight of 0.50 pounds.
Note that the current calculations below are based on a blade without taper.
Note that the following table should probably be revised to shift the weights out toward the tip further, because of the 25% cutout.
|
Blade Element |
Weight [lb] |
Mass [slug] |
Moment [slug-ft^2] |
Cone [radian] |
Cone [degree] |
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|
0 |
0 |
0 |
0 |
0 |
|
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|
1 |
2.749 |
0.085 |
0.014 |
-.001 |
|
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|
2 |
0.249 |
0.008 |
0.011 |
.0028 |
|
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|
3 |
0.249 |
0.008 |
0.031 |
.0071 |
|
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|
4 |
0.249 |
0.008 |
0.061 |
.0148 |
|
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|
5 |
0.249 |
0.008 |
0.100 |
.0236 |
|
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|
6 |
0.333 |
0.010 |
0.200 |
.0324 |
|
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|
7 |
0.333 |
0.010 |
0.280 |
.0403 |
|
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|
8 |
0.333 |
0.010 |
0.372 |
.0464 |
|
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|
9 |
0.333 |
0.010 |
0.478 |
.0509 |
|
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|
10 |
0.866 |
0.027 |
1.723 |
.0497 |
|
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|
Total |
5.943 * |
0.184 * |
3.270 |
.2679 |
|
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|
Average |
0.594 |
|
|
.0268 |
1.528 |
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* Note: The weight and mass is calculated at the center of each element except for element 10 where it is calculated at the blade tip because the tip weight comprises most of the weight.
Acceleration due to gravity = 32.17405.
Mass = Weight [in pounds] / Acceleration due to gravity
Moment of Inertia = Mass * Radius^2
|
|
Tip Weights |
Lock Number |
Coning Angle |
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|
|
0.00 pounds |
?? |
??degrees |
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|
|
0.25 pounds |
?? |
?? degrees |
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|
|
0.50 pounds |
7.3308 |
1.528 degrees |
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|
|
0.75 pounds |
?? |
??degrees |
||
FORM: Rotor - Disk - Coning Angle
Could be added here later for reference.
Notes:
For initial rough calculations of the above see;
DESIGN: Dragonfly ~ Rotor ~ Initial
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Last Revised: May 27, 2003
