Internationalist (oz10870)


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About this Plan

Internationalist. Free flight contest power model, for .15 engines. Wingspan 51-1/2 in, wing area 413 sq in.

Quote: "Suitable for AMA or FAI rules, this job was created especially for MAN by a free flight expert familiar with FAI designs. The Internationalist, by Peter Chinn.

The timely appearance of Herkimer's new Cub .14 motor of .149 cu in, or 2.45 cc, fills a vacancy which has hitherto existed in the model engine market; the vacancy being an American-built motor complying with FAI International free flight and Class I displacement category of 2.5 cubic centimeters maximum.

This gives us a good excuse to put in a plug for the International class free flight model. this model is becoming increasingly popular in Europe and is the only type free flight gas model recognized by the FAI Model Commission, offi-cial world-governing body for model aircraft activities. Free-flight gas models entered for International contests and for the World Championship power event must conform with rules laid down by the FAI, to which all member countries, including, of course, the USA, subscribe.

Rules require that the ship shall have a power loading of 200 grammes (7.06 oz) per cubic centimeter of engine displacement; that is to say, about 116 oz/cu in, or slightly heavier than the AMA 100 oz rule. The biggest displacement motor allowed is 2.5 cc (.1525 cu in). This means that if you use a motor of full 2.5 cc displacement, your model with engine must weigh 17.65 oz, or 2.4 oz more than if you were working to AMA rules.

There is also a wing-loading rule of 12 grammes per square decimeter, or 3.93 oz/sq ft, of all horizontal surfaces (ie wing and stabilizer) but this is so moderate as to mean that wing loading will be no greater than the majority of Class A models built under the AMA formula which imposes no minimum wing loading. The sole remaining requirement is a moderate cross-section rule in which fuselage cross-sectional area must equal or exceed 1/80 of total wing and stab area.

So, you see, there are no very great differences between A.M.A. and FAI rules and a model built to this International formula will also be eligible for AMA recognized contests.

There remains the question of deciding on a layout best suited to Americans, as well as International, requirements. It will have been noted that, unlike other World Champion-ship events such as Wakefield (rubber) and Swedish Cup (glider), International power does not, at the present time, fix a definite size and area. A smaller model than 2.5 cc can, in fact, be used and weights and areas adjusted accordingly. An American .099 (Arden, McCoy or Cub .099, etc.) could, therefore, be employed in a model proportionately smaller..."

Internationalist, MAN, May 1953.

Direct submission to Outerzone.

Supplementary file notes

Article pages, thanks to RFJ.


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