Scale Modeling Plan Sizes

Scale models are small versions of full-size planes. Because they do have real life counterparts, their proportions and coloration are suppose to match the full-size plane.   Documentation such as a 3-view helps as proof of scale.

There are many different divisions of Scale Models (in the real-world modeling community).

The major categories are:

Pistachio Scale
These planes may have a maximum wingspan of 8 inches. They are powered by rubber, and although most contests are for hand launch they can be built for R.O.W. (Rise Off Water).

Peanut Scale
The main criteria for Peanut Scale is a wingspan 13 inches or less. These are generally built as rubber powered hand launch planes or can be built as float models for R.O.W. contests.

Walnut Scale
Walnut scale models are restricted only by a maximum wing span of 18 inches. Aside from local club events, Walnuts are rarely flown in competition, having been eclipsed by the very popular Peanuts and Pistachios. Walnuts do fly exceptionally well, and should not be overlooked for general sport flying.

Open Scale
Models with a 36 inch maximum wingspan qualify for the open division. These contests are generally for rubber power. These are more likely to carry a dethermalizer fuse than the smaller models.

Jumbo Scale
When the wingspan exceeds 36 inches, what else could you call it but Jumbo? We don't really carry many plans or kits for the large planes, but many of our supplies and accessories are used on these bigger models.

Power Scale
These contests are usually divided by size and by power source. The divisions are decided ahead of time and advertised as such. For example, a contest include Peanut Scale CO2, Open Scale Electric, Jumbo Scale Gas. The gas contests usually include judging of the take off's and landings.

Sport Models
These models are designed for specific regulations of the contest they are meant to compete in. They may be required to use a specific prop or to have a cabin on the model. Sometimes the size of paper the plans are on or the length of the rubber motor are the distinctions. In these contests, even if the cabins or wheel pants or other realistic details are not required, you sometimes receive extra points.

Hopefully these trimmed down guidelines will help you understand some of the categories that models fall into. If you wish to find out more, the best choice is to talk to some of the clubs in your area. If you are having trouble locating a club, try writing to the clubs listed in the Info Resources page.

2003 Wings Publishing