Predim RC, english version

	PredimRC

Presentation : Franck Aguerre

"What for?"
This Excel software allows effective and quick pre-demensionnig of an R/C airplane or glider, and gives a realistic estimate of its overall performance.
PredimRc compute also the best settings for the model, to avoid the very classic crash due to inadapted center of gravity. In this way, PredimRc can be very helpfull to verify the settings of model built from a kit or a plan.

Prerequisites
The only knowledge required is minimal aerodynamic concepts. PredimRc is very simple et didactic, so the user can easily understand the influence of each parameter to the performance or the settings. In order to better guide the user, most data have comments, often with typical values.
To go further, see the reference site: www.chez.com/aerodynamique, both complete and accessible.

Operation:
PredimRC is divided into 5 sections (tabs), which follow logically through the design of the model. Each section is dedicated to a particular point of the conception process :
- Airfoils : a data base of 9 generic airfoil is provided, extensible to 36 airfoils
- Aspect ratio : choice and optimization for high performance aircraft
- Overall geometry : drawing of the aircraft, optimization of the lifting distribution, rating of the performances (sink rate, lift-to-drag ratio), et above all precise calculation of the center of gravity and angles of incidence.
- Motorization : calculation of the power equilibrium in flat path, and estimation of the climbing rate
- Servos : calculation of torque for all classical controls and pendular elevator, and optimization of pitcheron system

Lexicons data handled:

Input to enter:
- Wing geometry
- 3 wing polar airfoils
- CM0 and Alpha0 profiles
- Stabilisator geometry
- Fuselage geometry
- Cz stabilized flight
- Arm
- Weight
- Data engine

Input pre-programmed:
- Stabilisator CM0 = 0, ie the center of thrust at 25% of the average stabilisator chord
- Gradient of the curve Cz = f (impact profile), set to 1 / 11
- 3 stabilisator generic airfoils

Elements Release:
- Data bases (scope, size, wing loading)
- Elongations calculated / optimized
- Curves of distribution of Cz and lift VLM
- Calculated center / rear
- Timing of the wing
- Setting of stab
- Volume of stab
- Margin of stability
- Performance curves according to flight speed:
    ~ Polar speeds
    ~ Finesse
    ~ Power consumption / power (intersection = speed of flight)
    ~ Curve Cz / airspeed
- Flight data engine (autonomy, speed climb, ...)

Supplemented, improved, here is the latest version of PredimRC (translated in english by Florent Violain, many thanks to him !)

What new :

Improved interface
COG calculation and AOI improved
Polars interpolation tools separated from the main application
Addition of generics airfoils (micro, trainer, multipurpose, quick, flying wing, aerobatic, racer/F3F/F3B/60 with or without flaps)
Additon of a customizable airfoil database

The guide (V2.1) does not change at this time because the features are the same to that provided by previous releases.

The guide does not change at this time because the features are essentially identical, the guide to 2.1 is sufficient to find them.

To download PredimRC V2.22 that works with Excel, click the button.
(675 kb)

And below, the very explicit user guide in PDF version 2.1.
(2.1 MB compressed)

Uncompressed version here here (2.7 MB, in french)

Note: If you follow the regular updates of this site, you have found
Franck touch regularly for its further development.
The latest version of the program updated date from the
June 3 2009
(Check if this version you ...)

Acknowledgments
- To Raphael Gougnot for its magnificent site and indispensable "The encyclopaedia of small aerodynamicists grass" (see link above).
- To Mathieu Scherrer and Thierry Platon for their publications on the center of gravity and taking into account the issue of wing wake.
- A John Hazel for the adaptation of the method Excel VLM.
- Many thanks to Dam's, Xav and Nono for their valuable contribution in the guide PredimRC.
- To Laurent Berlivet, for his enthusiasm still intact despite the galleys, and of course for the release of this software in jivaros-models. (Note for the webmaster: I'm the one who thanks you for your faithfulness and your generosity. It's always a pleasure to share these pages, and more if they are beneficial to others.)
- To all those who appreciate this tool ...

Contact the author: franck.aguerre@jivaro-models.org

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