Can't reach desired speed with Arduplane

ArduPlane Plane 4.0
1

Hi, I recently switched from ArduCopter to ArduPlane and been having issue with reaching high speeds. So I set the AIRSPEED_MAX to 100, AIRSPEED_CRUISE is 22, AIRSPEED_MIN is 10.

I send it a MAV_CMD_NAV_WAYPOINT with a MAV_CMD_DO_CHANGE_SPEED. and I know it works because if I set the speed to anything under 32m/s, it attains it normally, but when I set it to anything over 32m/s, it just maxes at 32, so I tried 50 and 80 and more and it doesn’t get past 32.

I tried changing Q_ANGLE_MAX to 8000, didn’t help. The THR_MAX is 100. I also tried changing TECS_SPDWEIGHT and tired 0, 1, and 2, and it still doesn’t work. I don’t know what else to do. My autopilot version is ArduPlane V4.7.0-dev. Any suggestions? Thank you

2

Parameters don’t affect physics, apparently your plane isn’t capable of reaching higher airspeed in horizontal flight.

Please post a log file.

2 Likes
3

Oh, I forgot to mention. It is all still in SIM. not sure if this means the physics shouldn’t affect it.

4

Even some rudimentary level of physics still apply in most sims.

1 Like
5

An important part of the simulation is physic (flight dynamics) model, it is separate from the Autopilot configuration.

2 Likes
6

got it, this is the log file.
It starts, arms, then I send it two mission items with speed of 100m/s. I disarm it half way through to download the files (the waypoints are far away and I figured you wouldn’t need the whole thing, it will be too large, but if you do just let me know!) Thank you for looking into this!

7

were you able to find anything?

8

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Simple math. Throttle is at 100%. It’s going as fast as it can. Physics…

Damnit Jim! You can’t push it any faster! :laughing:

9

I see, do u know if there r other vehicle frames or mav types that can go faster? For sims purposes, I don’t care what vehicle it is, I need to simulate a faster vehicle.

10

I don’t, but you can check out the SITL wiki. You should be able to use it with something like xplane or real flight to fly something faster.

https://ardupilot.org/dev/docs/sitl-simulator-software-in-the-loop.html