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Re: [Paparazzi-devel] add a AOA sensor

From: Hector Garcia de Marina
Subject: Re: [Paparazzi-devel] add a AOA sensor
Date: Tue, 13 May 2014 11:16:24 +0200

Hi Mike,

well, modelling such "small airplane" with accuracy is a hard task. 

I have been using AVL: in the past. Just figure out what is the NACA profile for your wings and tail wings, "cut" the control surfaces and put the fuselage as a block and start to compute your coefficients. The drag one will be not so much accurate and the trust coefficient depends on your propeller (and eventually on your motor if you cannot control/known precisely the rpm). And in the end, you have to tune your coefficients
with some identification models.... 

On the other hand for Hardware in the loop testing or for getting a general idea about how your algorithms will work with your plane, it is fine just with obtaining some coefficients from well known planes close to yours (I guess it is close to a Cessna??), or work directly with Flight Gear Simulator or X-Plane (there are nice guides in the PPZ wiki or look at the ArduPilot forums/wiki), they have great models and you do not have to spend so much time on modelling stuff.

On Mon, May 12, 2014 at 4:47 PM, Mike <address@hidden> wrote:
Hi H.G. de Marina,
       I am very glad to see your answer! Recently I am studying a article
of yours in EI,
The article is "UAV Attitude Estimation Using Unscented Kalman Filter and
And now I also study GNC of UAV based paparazzi with apogee v1.0;
My aim is to design a Online trajectory generation algorithm and embed it
into apogee.
I have some problems about my project; I need your help:
       First, I want to set a simulink model of the whole system with my
so I need a model of the dynamic of my vehicle;
what kind of process do I use to obtain the aerodynamic coefficients /
aircraft model?
use xflr5 or CEASIOM? Which is better?
Here is my aircraft:
                         Full length: 1180mm
                         Wingspan: 1900mm
                         Cabin space: 172mm high * 280mm * 60mm width length
                         Maximum Takeoff Weight: 2.5kg

      Second, I want to add a AOA sensor to get the angle of attack data,
How to craft my own "home made" AoA sensor? Is there a Schematics of it?


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