Page
15
The Mean Aerodynamic Chord (MAC) is calculated by adding the wing and flaperon area and divide by span.
MAC
=
AREA
=
183.10 ft sq
=
5.37ft / 64.50in
MEAN SPAN
34.08ft
1. DATUM
-
Cockpit front cross tube
0.00
2. Pilots Pelvis position
-
Pilot
CG
35.0in
3. Front Axle
-
Front Wheels
50.0in
4. Leading Edge of Wing
-
60.0in
5. Fuel Tank Center
-
60.0in
6. Rear Seat Pelvis position
-
Co Pilot CG
82.0in
7. Tail Wheel Axle
-
196.0in
EMPTY WEIGHT MEASURED AS FOLLOWS and the Moment Arm from DATUM used to calculate moments.
(Note – these
readings for a typical aircraft)
Empty Weight Mass
Moment Arm
Moments
Front Rt. Wheel
179.0lb
50.0in
8950in lb
Front Lt Wheel
174.5lb
50.0in
8718in lb
Rear Wheel
162.0lb
196.0in
31752in lb
Total Weight
515.5lb
Total Moments 49420in lb
CG from Datum
=
Moment =
49420in lb
=
95.90in
Mass
515.5lb
The Leading Edge of the wing is 60.0in aft of Datum. The empty weight CG position from the Leading Edge is then:-
95.90in – 60in
=
35.9in
As a percentage of MAC
35.9
=
0.556
55.6%
64.5
1.1.5.3.1
MAX. AFT CG WITH 133lb PILOT AND 11lb FUEL (example)
Weight
Arm
Moment
Aircraft
515lb
95.9in
49388.5in lb
Fuel
11lb
60.0in
660.0in lb
Pilot
133lb
35.0in
4655.0in lb
659lb
54703.5in lb
CG
=
MOMENT
=
54703
=
83in
MASS
659
As a percentage of MAC
83 - 60 =
23
=
23
=
0.357
=
35.7%
MAC
64.5
1.1.5.3.2 CG WITH MAX FUEL & TWO 90 KG / 199 lb. PILOTS
(example)
Weight
Arm
Moment
Aircraft
=
515lb
95.9in
49388.5in lb
Fuel
=
33lb
60.0in
1989.0in lb
Pilot
=
199lb
35.0in
6965.0in lb
Co Pilot
=
199lb
82.0in
16318.5in lb
946lb
74660.5in lb
CG
=
MOMENT
=
74660
=
78.92in
MASS
946
As a percentage of MAC
78.92 – 60 =
18.92
=
18.92
= .293
=
29.3%
MAC
64.5
Summary of Contents for 912 Dragonfly
Page 3: ...Page 2 ...
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Page 25: ...Page 24 Drawing 1 ...
Page 27: ...Page 26 Drawing 2 ...
Page 29: ...Page 28 Drawing 3 ...
Page 31: ...Page 30 Drawing 4 ...
Page 33: ...Page 32 Drawing 5 ...
Page 35: ...Page 34 Drawing 6 ...
Page 37: ...Page 36 Note for Hydraulic Brakes see Appendix B Drawing 7 ...
Page 39: ...Page 38 Drawing 8 ...
Page 41: ...Page 40 Drawing 9 ...
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Page 45: ...Page 44 Drawing 11 ...
Page 47: ...Page 46 Drawings 12A 12B ...
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Page 67: ...Page 66 Drawing 22 ...
Page 69: ...Page 68 Drawing 23 ...
Page 71: ...Page 70 Drawing 24 ...
Page 73: ...Page 72 Drawing 25 ...
Page 75: ...Page 74 Drawing 26 ...
Page 77: ...Page 76 Drawing 27 ...
Page 79: ...Page 78 Wiring1 jpg Drawing 28a ...
Page 80: ...Page 79 Wiring2 jpg Drawing 28b ...
Page 81: ...Page 80 elecLights jpg Drawing 28c ...
Page 83: ...Page 82 Drawing 29 ...
Page 85: ...Page 84 Drawing 30 ...
Page 92: ...Page 91 Appendix B Brakes Manual for BX1320 BX1000 Appendix B Page 1 ...
Page 93: ...Page 92 Appendix B Page 2 ...
Page 94: ...Page 93 Appendix B Page 3 ...
Page 96: ...Page 95 Appendix B Page 5 ...
Page 97: ...Page 96 Appendix B Page 6 ...
Page 98: ...Page 97 Appendix B Page 7 ...
Page 104: ...Page 103 Figure 1a Description of Display Pages ...
Page 105: ...Page 104 Figure 1b Description of Display Pages ...
Page 138: ...Page 137 Appendix C EIS 4000 912 914 ...
Page 139: ...Page 138 Appendix C EIS 4000 912 914 ...
Page 140: ...Page 139 Appendix C EIS 4000 912 914 ...
Page 141: ...Page 140 Appendix C EIS 4000 912 914 End Appendix C ...
Page 155: ...Page 154 Appendix E2 Powerfin Prop Page 2 ...
Page 156: ...Page 155 Appendix E2 Powerfin Prop Page 3 ...
Page 157: ...Page 156 Appendix E2 Powerfin Prop Page 4 ...
Page 158: ...Page 157 Appendix E2 Powerfin Prop Page 5 ...
Page 159: ...Page 158 Appendix E2 Powerfin Prop Page 6 ...
Page 160: ...Page 159 Appendix E2 Powerfin Prop Page 7 ...
Page 161: ...Page 160 Appendix E2 Powerfin Prop Page 8 ...
Page 162: ...Page 161 Appendix E2 Powerfin Prop Page 9 ...
Page 163: ...Page 162 Appendix E2 Powerfin Prop Page 10 ...
Page 164: ...Page 163 Appendix E2 Powerfin Prop Page 11 End of Appendix E2 ...
Page 187: ...Page 186 By Memphis Soaring FIGURE 3 Common Signals ...