Model This: Aeronix Airelle

Marginal Cost Definition - Model This: Aeronix Airelle

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Background

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Marginal Cost Definition

The Airelle was a two seat tandem wing kit aircraft produce by the French Aeronix company. It first flew in 2002. A gorgeous design, the enterprise went out of enterprise in 2006 before its possible could be realized.

Very minuscule information on the produce is available. Only about five were built, which limits the estimate of habitancy with first hand taste with the design. Given that it was a French design, finding information in English is even harder.

Tandem Wings

It superficially resembles any of the designs of Burt Rutan. It is easy to mistake the front wing with a canard surface. I don't know at what size the front foreplane ceases being a canard and officially becomes a front wing. It might be up to the designer to profess it as one or the other. Anyway, in the Airelle the span of the front wing is 80% of the span of the rear wing. A canard surface is ordinarily 50% of the span of the wing or less.

I designed, built, and flew a tandem model airplane once. Both wings were same in size and shape. It's a very animated configuration, and I hope to produce and build other one someday soon. Having two same wings had any animated advantages, which I plan to illustrate someday. But a problem with the tandem wing produce is that the rear wing is going along for a free ride, so to speak. To have pitch stability, the town of gravity has to be quite a bit closer to the front wing.

Push-Pull engine Configurations

A very unusual aspect of the produce is the twin engines in an inline configuration. I don't know why they decided to produce their airplane this way. I have a hunch that their former motivation may have been to bring the town of gravity of the airplane to the middle of the cockpit. That avoids a whole host of weight and equilibrium problems that canards are known to run into.

A problem that twin-engined airplanes have is lower efficiency. Two smaller propellers are less effective than one bigger one. First and maintenance costs are considerably higher in a twin. With 40 hp in each engine, I don't know if one-engine out carrying out was a selling point. That's probably sufficient power to profess some sort of cruise flight, but it would be very marginal in a 1,000 pound airplane (450 kg).

Side-by-Side Seating

A big incompatibility from the Rutan Long-Ez is the side-by-side seating. I have flown in both configurations, and being seated right next to the other someone in the airplane is just a friendlier way to fly.

The large canard surface right in front of the cockpit at waist level did not do whatever good for visibility forward and down. But visibility to the side and down is excellent, which more than makes up for it. With those huge windows, the Airelle seems like a excellent airplane for going sightseeing.

Creating the Model

How hard would it be to originate a scale model of the Airelle? With no three-view drawings, no flying airplanes, and a minuscule option of photographs, creating a extremely accurate scale model would be a challenge. But there is definitely sufficient information available for creating a great finding model.

Summary

This is a very good finding airplane design. It would make an excellent scale subject. If you build one, be sure and let me know about it!

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