There is also a tailsitter-specific parameter to limit roll to less than Q_ANGLE_MAX
It is Q_TAILSIT_RLL_MX: https://ardupilot.org/plane/docs/parameters.html#q-tailsit-rll-mx-maximum-roll-angle
But you shouldn’t need it for a dual-motor tailsitter, since it will have essentially unlimited roll (bodyframe yaw) authority in VTOL modes.
yes, but I don’t need to differentiate pitch and roll limits in Q modes so I thought I would set it to zero.
first tests with:
Q_ANGLE_MAX=30
Q_TAILSIT_RLL_MX=0
Q_TAILSIT_ANGLE must always be less than Q_ANGLE_MAX?
If I choose Q_ANGLE_MAX = 30, because I don’t need a nerve wing, then I can’t give Q_TAILSIT_ANGLE one high value to have time to accelerate in transition. Maybe increasing Q_M_TSHT_HOVER can make up for it
Start with Q_TAILSIT_ANGLE and Q_TRANSITION_MS at the default values
Set Q_M_THST_HOVER to the value needed to hover
That should result in a reasonably good transition as a starting point for tuning.
Hello everyone. Where is the ideal position to place the autopilot in a vectored thrust craft?
Does it have to be smack bang in the middle of the cog or can it be little forward or aft of the cog
I don’t think location relative to the CG is critical for attitude control, and I would expect it’s not important for position control either.
Can anyone upload a latest parameters for non vectored tailsitter Plz.
Hello Syam,
In my humble opinion I think it is better to understand and deepen understanding each parameter. It can be a bit tedious but it is more beneficial in the long run. A copy & paste can be counterproductive for your model
I have read all the 2k comments for the last 4days and set the parameters…but qhover and qloiter its not behaving as the way needed . Because iam using Skydroid rc…there is no proper trim options…
This thread resume some basics :
I started with non vectored, and changed to vectored because of bad experiences.
And when you read all posts, you may noticed that not many others hat good results. To unstable especially in wind.
For qhover or qloiter or Copters you do not need trims at the TX.
Guys my plane is moving towards right side continuously and horizon is showing flight is rolled to right…
When i turn stick to left , both horizon and flight came to level . When released again moving towards right.
Why this happens. Flight was in stabilize mode.
Its non vectored
When you have an issue you need to post the .bin file from the flight controller.
Hello friends. I fly the FX-61 in the tailsitter configuration, with your help I managed to achieve stable flight and transitions. Not so long ago the FX-79 came, I installed more powerful SUNNYSKY X3520 motors and RDS3115 servos on it. The files for printing were kindly provided by lorbass, for which many thanks to him. The following problem arose: the FX-79 refuses to hang stably, oscillations occur along the pitch axis and I cannot defeat them. Tried different PID options. Who faced this problem and how to deal with it? Could it be the servos? My config file:FX-79.param (21.1 KB)
Loving TVBS!..my latest…and smallest…and most efficient so far…
needs a little more tuning…
next I have a NIB s-800 I want to convert…it will be even a bit smaller in wingspan, 800 vs 845mm but I dont think it will be as efficient…
That looks great! What deflection can you get on the motors with that design? It looks simple and lightweight. I wonder if it would avoid some of the gyroscopic torque issues that a direct tilt servo mount has…?
Approximately +/- 45 degrees
I managed to make several flights with my FX-79
Looks cool !
Could you tell us more on AUW / Flight time is you have already it. You run X3520 520 Kv on 6S i guess, which prop are you using ?