Sorry to respond to myself, but wanted to add some detail:
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 0.0 36.0 14.0 24.0
2 Left Passenger 0.0 70.0 -14.0 24.0
3 Right Passenger 0.0 70.0 14.0 24.0
4 Baggage 0.0 95.0 0.0 24.0
0 Fuel 100 56 -112 59.4
1 Fuel 100 56 112 59.4
Total: 1880.0 42.1 -1.3 37.7
The CG-X arms should match what's in the TCDS and POH.
The propeller file also does not match between JSBSim and FlightGear. JSBSim
has the same tables, but they were commented out and replaced with new
tables.
Using a script I wrote to simulate a softfield takeoff technique[1], I see the
following:
datafiles as they are in FGDATA:
Flaps 0%
Time Speed RPM Height Event
(s) (knot) (ft agl)
0 0 1900 0 Brake Release
11 40 2332 0 Rotation
17 59 2430 0 Lift off
22 71 2525 8
32 83 2621 84 456 fpm
Flaps 30%
Time Speed RPM Height Event
(s) (knot) (ft agl)
0 0 1900 0 Brake Release
11 40 2330 0 Rotation
17 58 2423 0 Lift off
23 67 2500 14
33 75 2565 90 492 fpm
Using JSBSim's IO-320 and Propeller
Flaps 0%
Time Speed RPM Height Event
(s) (knot) (ft agl)
0 0 1900 0 Brake Release
9 39 2500 0 Rotation
13 58 2600 0 Lift off
23 84 2800 50 Engine over red-line
33 98 2875 200 900 fpm
Flaps 30%
Time Speed RPM Height Event
(s) (knot) (ft agl)
0 0 1900 0 Brake Release
9 39 2500 0 Rotation
12 53 2600 0 Lift off
18 70 2680 15
23 77 2800 130 Engine over red-line
33 87 2830 216 516 fpm
[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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