Royal Marine (oz5579)

About this Plan

Royal Marine. Radio control twin seaplane model.

Quote: "The world's most beautiful flying boat. Magnificent twin-40-powered seaplane by one of Japan's leading modelers is a fully stuntable graceful flyer which can handle all ROW conditions.

RECENTLY, R/C modelers have been driven away from flying sites for various reasons, usually building of factories and houses. Now we are almost forced to the foot-hills. As a matter of fact, I often visit hills nowdays and I find few flat flying sites, but some lakes and good slopes. In this situation, I have tried to develop R/C hydroplanes and slope-soaring gliders.

I want to introduce my twin-engined flying boat, which was flown very successfully at the OS Invitational Symposium at Lake Biwa, near Osaka last fall. Although the R/C hydroplane itself is not a novel subject for modelers, it is regarded as a difficult one to handle. The reason is supposed to be in the fact that the hydroplane has a problem of solving the adjustment on, or in, the water, in the air, and in between. We know of many cases that ignore one of these problems, rather than try to solve it. That is why some planes jump up in a VTO, making a steep climb without showing any beautiful planing. Some crawl on the water without an ability to conquer the 'hump.' Some fly unstably in the air because of the parasite drag caused by the floats or the hull of inadequate designs, etc.

I have had an ardent wish to duplicate a beautiful, thrilling takeoff and landing, and a good performance in the air of a full-size flying boat into that of an R/C model. I did not avoid the problems of the two spheres (water and air) but tried to solve them. The flying boat in this article might not be the ideal, or the ultimate one. The study of WR/C hydroplane must be continued in the future, but I have many witnesses prove the ability of this plane.

This is not a contest plane - its purpose was to enjoy flying it and its appearance. The points considered in the basic study prior to designing were as follows:

1) Performance on the water and in the air.
2) Simple but strong structure in order to simplify maintenance when one is far from a work shop.
3) Beautiful appearance.

I won't give how-to-build details, but will comment on design and structure.

The performance of a flying boat depends on the design of the hull. This is the primary difference from a Land plane whose fuselage design has relatively less importance - at least in R/C model planes. Considering lateral stability on the water, takeoff characteristics, parasite drag in the air, and structural weight, a hull with a bottom of relatively large area (instead of a deep hull) and with a sector-section (fan-shaped section), was taken as a basic concept..."

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