Fixed-wing aircraft airspeed control without an airspeed sensor

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Fixed-wing aircraft airspeed control without an airspeed sensor

wertrrte
Hi,

My plane doesn't have an airspeed sensor and I hope it can keep its altitude even in strong wind so it will not crash easily and thus more reliable.Is it possible to achieve this?

wertrrte
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Re: Fixed-wing aircraft airspeed control without an airspeed sensor

Reto Büttner
Hi wertrrte
 
This is easily possible. The Paparazzi throttle control has a setpoint (horizontal flight at cruise speed) and adjusts throttle for height control. This method leads to nicely constant airspeed, once tuned well. We flew a lot and also very demanding flights without an airspeed sensor with perfect results. We weren't even able to optimize flight performance using an airspeed sensor. For simplicity and reliabilty I therefore even recommend to do without an airspeed sensor, but rather to invest some time in good tuning.
 
Cheers, Reto

2014-08-21 12:30 GMT+02:00 wertrrte <[hidden email]>:
Hi,

My plane doesn't have an airspeed sensor and I hope it can keep its altitude
even in strong wind so it will not crash easily and thus more reliable.Is it
possible to achieve this?

wertrrte



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Re: Fixed-wing aircraft airspeed control without an airspeed sensor

Helge Walle
Hi,

I have found that my two Paparazzi planes, Twinstar 2 and Skywalker, fly very well in "normal" wind conditions without an airspeed sensor. By "normal" I mean winds comfortable for normal RC flying.

I have however an Eagle Tree airspeed sensor in my Skywalker, used only for measurements. I find I can do some interesting analysis when I compare the speeds reported from the airspeed sensor and the GPS.

Helge.





2014-08-21 13:37 GMT+02:00 Reto Büttner <[hidden email]>:
Hi wertrrte
 
This is easily possible. The Paparazzi throttle control has a setpoint (horizontal flight at cruise speed) and adjusts throttle for height control. This method leads to nicely constant airspeed, once tuned well. We flew a lot and also very demanding flights without an airspeed sensor with perfect results. We weren't even able to optimize flight performance using an airspeed sensor. For simplicity and reliabilty I therefore even recommend to do without an airspeed sensor, but rather to invest some time in good tuning.
 
Cheers, Reto

2014-08-21 12:30 GMT+02:00 wertrrte <[hidden email]>:
Hi,

My plane doesn't have an airspeed sensor and I hope it can keep its altitude
even in strong wind so it will not crash easily and thus more reliable.Is it
possible to achieve this?

wertrrte



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View this message in context: http://lists.paparazziuav.org/Fixed-wing-aircraft-airspeed-control-without-an-airspeed-sensor-tp16017.html
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Re: Fixed-wing aircraft airspeed control without an airspeed sensor

wertrrte
Helge,thanks for your information,I got it.

According to your experience,which control law is the best among the four(no type,adaptive,new and energy)?Of course,'best' means in that mode,the plane is the most stable(especially for altitude).

wertrrte
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Re: Fixed-wing aircraft airspeed control without an airspeed sensor

wertrrte
In reply to this post by Reto Büttner
Thanks,Reto

So which control law is the best and I should choose?In the code,I saw a macro,'STRONG_WIND',maybe this is exactly for my case?

wertrrte

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Re: Fixed-wing aircraft airspeed control without an airspeed sensor

Helge Walle
In reply to this post by wertrrte
Hi wertrrte.

I have not used other than <subsystem name="control" />  which is the standard fixed wing control loops.
This seems to work fine for my planes.

I attach the configuration file for the Skywalker.

Helge.



2014-08-21 18:18 GMT+02:00 wertrrte <[hidden email]>:
Helge,thanks for your information,I got it.

According to your experience,which control law is the best among the four(no
type,adaptive,new and energy)?Of course,'best' means in that mode,the plane
is the most stable(especially for altitude).

wertrrte



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skywalkerhw_twogv1_sen10121_1.xml (18K) Download Attachment
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Re: Fixed-wing aircraft airspeed control without an airspeed sensor

Reto Büttner
In reply to this post by wertrrte
Hi wertrrte
 
We also used standard control loops. No adaptive, energy, strong_wind or similar. Learn what the parameters do, tune well and you are fine.
 
Cheers, Reto
 


2014-08-21 18:29 GMT+02:00 wertrrte <[hidden email]>:
Thanks,Reto

So which control law is the best and I should choose?In the code,I saw a
macro,'STRONG_WIND',maybe this is exactly for my case?

wertrrte





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