Adding another adult in the front seat, and two large kids/small ladies in the
back seat, as well as 50 lbs of luggage and a near full load of fuel:
Mass Properties Report (English units: lbf, in, slug-ft^2)
Weight CG-X CG-Y CG-Z
Base Vehicle 1500.0 41.0 0.0 36.5
0 Pilot 180.0 36.0 -14.0 24.0
1 Co-Pilot 180.0 36.0 14.0 24.0
2 Left Passenger 100.0 70.0 -14.0 24.0
3 Right Passenger 100.0 70.0 14.0 24.0
4 Baggage 50.0 95.0 0.0 24.0
0 Fuel 170 56 -112 59.4
1 Fuel 170 56 112 59.4
Total: 2450.0 45.8 0.0 36.6
Using a script I wrote to simulate a softfield takeoff technique[1], I see
the following:
Using FlightGear's IO-320 and Propeller
Flaps 0%
Time Speed RPM Height Event
(s) (knot) (ft agl)
0 0 1900 0 Brake Release
14 41 2300 0 Rotation
25 64 2500 0 Lift off
32 74 2570 8
42 84 2625 62 324 fpm
Distance traveled: 1087 ft
Distance traveled (over 50'): 2763 ft
Flaps 30%
Time Speed RPM Height Event
(s) (knot) (ft agl)
0 0 1900 0 Brake Release
14 41 2350 0 Rotation
23 59 2430 0 Lift off
32 71 2540 16
42 75 2570 64 288 fpm
Distance traveled: 1009 ft
Distance traveled (over 50'): 2529 ft
Using JSBSim's IO-320 and Propeller
Flaps 0%
Time Speed RPM Height Event
(s) (knot) (ft agl)
0 0 1900 0 Brake Release
11 40 2500 0 Rotation
18 63 2625 0 Lift off
23 74 2717 4 Engine over red-line
33 89 2830 145 846 fpm
Distance traveled: 827 ft
Distance traveled (over 50'): 2191 ft
Flaps 30%
Time Speed RPM Height Event
(s) (knot) (ft agl)
0 0 1900 0 Brake Release
11 39 2500 0 Rotation
18 59 2600 0 Lift off
23 77 2696 8 Engine at red-line
33 80 2770 76 408 fpm
Distance traveled: 717 ft
Distance traveled (over 50'): 1951 ft
[1] The aim of the script was to get off the ground asap then lower the
nose to gain airspeed. It does not try to establish a best climb speed.
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