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Re: [Paparazzi-devel] fixed wing angle of attack and cruise speed

From: Chris
Subject: Re: [Paparazzi-devel] fixed wing angle of attack and cruise speed
Date: Tue, 19 Nov 2013 20:39:50 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:24.0) Gecko/20100101 Thunderbird/24.1.0

Got it, thank you very much for your help.
I think i will try to increase pitch with the "pitch_neutral_default" and see what happens.
Btw i am always learning, i didn't knew the cruise throttle setting behavior as you described it, thank you again.

On 11/19/2013 08:20 PM, Loic Drumettaz wrote:


If you want to reduce speed without using an airspeed sensor, the easiest is to set nominal pitch using pitch_neutral_default in the airframe configuration.
This will offset the measured pitch.
You can tune pitch_neutral in flight by adding settings/estimation/ins_neutrals.xml in paparazzi center.
Constant airspeed in level flight is then obtained with accurate (no static error) attitude pitch loop.

nominal_cruise_ throttle is a preset of thrust which is corrected by auto throttle loop. Reduce it will only increase the airplane altitude error, but won't help to reduce speed ( at least in steady flight)


Le 19 nov. 2013 16:41, "Chris" <address@hidden> a écrit :
I was thiniking that if i want to make an airplane to go slower could i use a higher angle of attack during flight thus increasing lift (within the lowest drag envelope of course)?
If i am right what settings other than minimum cruise throttle do i need or is possible to adjust?
I am asking because i have an airplane (the huge Cessna) that can fly more than safely with 80km/h
and have significantly reduced drag but the autopilot gives it a cruising speed of 110km/h even with low throttle (40%) and at 3 degrees wing pitch during flight.
I am searching for those last bits that can decrease fuel consumption to a minimum :-D

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