Mirrors_Framework/PX4-Autopilot
1
0
Fork 0
mirror of https://github.com/PX4/PX4-Autopilot.git synced 2026-10-06 09:02:52 +08:00
Code Issues Packages Projects Releases Wiki Activity

feat(sihsim): more airplane thrust for a 30 deg climb and 20 m/s cruise

Browse Source 
At 9000 RPM the propeller produced 4.6 N at trim airspeed while the model
needs about 5.3 N to hold 15 m/s level, so the plane could not sustain
trim airspeed at all.

Spin the same APC 8x6" propeller at 13000 RPM, which gives 11.3 N at trim
airspeed. The step is this large because prop wash over the tailplane and
the fin increases their local dynamic pressure, which eats roughly three
quarters of any added thrust.

Also raise the maximum climb rate, since a 30 deg climb at trim airspeed
needs 15 m/s * sin(30 deg) = 7.5 m/s and the default is 5 m/s.

Measured in SITL: 19.7 m/s at full throttle in near level flight (3 deg,
1 m/s climb). The thrust sustains a climb of over 30 deg, but reaching it
requires a steeper pitch than the takeoff and pitch limit defaults allow.

Signed-off-by: Silvan <silvan@auterion.com>
This commit is contained in:
Silvan
2026-08-25 11:25:23 +02:00
committed by Silvan Fuhrer
parent 0010100f6d
commit e006f67a89
1 changed files with 6 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
ROMFS/px4fmu_common/init.d-posix/airframes/10041_sihsim_airplane
+6 -1
View File
@@ -31,11 +31,16 @@ param set-default SIH_F_CP0 0.0777
param set-default SIH_F_CP1 0.0498
param set-default SIH_F_CP2 -0.11
param set-default SIH_F_DIA_INCH 8
param set-default SIH_F_RPM_MAX 9000
param set-default SIH_F_RPM_MAX 13000
param set-default SIH_VEHICLE_TYPE 1 # sih as fixed wing
param set-default RWTO_TKOFF 1 # enable takeoff from runway (as opposed to launched)
# 13000 RPM gives ~11 N of thrust at trim airspeed, which is a 30 deg climb at
# trim and 20 m/s in level flight. Raise the climb rate so TECS
# can command that climb (15 m/s * sin(30 deg) = 7.5 m/s)
param set-default FW_T_CLMB_MAX 8
param set-default CA_ROTOR_COUNT 1
param set-default CA_ROTOR0_PX 0.3