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Re: [Paparazzi-devel] PPZ control without aileron ?

From: Famille Chateauvieux-Hellwig
Subject: Re: [Paparazzi-devel] PPZ control without aileron ?
Date: Fri, 2 Jan 2009 23:24:49 +0100
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>               Has anyone achieved stable PPZ control on a plane with no
> Aileron? (i.e. rudder and elevators only)


I use an UAV without ailerons. It's not a Paparazzi though. It doesn't have 
tge IR horizon sensig. It relies on a autostable model. See I use yaw control stabilized by a standard 
gyroscope from ACT Europe. In automatic flight I use only ~25% of the rudder 
range. The gyroscope helps stabilize the flight by bringing the model to a 
straight flight very quickly after the autopilot gives order to fly straight. 
My model is derived from a beginner model with enough diedral. It works fine. 

I regulate altitude using power. More power climbs, less power descend. 
However this oscillates a lot. Especially when flying curves, the apparent 
weight brings the model to descend and accelerate.
So the next development is a proper air speed control (Pitot tube). The 
ailerons are low prio for now.

Happy new year to all UAV pilots !

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