Swan Song (oz2687)

 

Swan Song - plan thumbnail image

About this Plan

Swan Song. Free flight flying boat model.

Quote: "Designed in Canada, realistic flying boat for your new Cub .14 or an old Arden .099. Swan Song, by Andrew Lennon.

There are few thrills to compare with flying a well-designed model flying boat. A swift, smooth take-off, turning climb and glide and realistic clean landings provide much enjoyment. In addition there is a bonus of good fun and exercise to be had on the open water.

The design of a model flying boat offers a real challenge. One must design a boat and match it to a set of wings and a tail. It may fly but will it take off well or at all? Swan Song rates high in both respects. The culmination of a series of four water model aircraft, it incorporates the experience gained with each plus that gained with many conventional free flight' models.

The hull is the long, planing fail tapered afterbody type based largely on data in NACA Report 844 and Technical Note #1101. This type combines a deep pointed-step forebody, having low water resistance, with a very long tapered afterbody that extends back to the region where the tail surfaces are attached; thus no tail extension is required.

Such a hull has low resistance at both hump and take-off speeds; the longitudinal stability is less critical than conventional types and the directional stability on the water is excellent.

In order to obtain the low resistance at hump speed, the center of gravity has to be located aft of the step. This proves a decided advantage for a model designed to have its CG at approximately 75% of the wing chord behind the leading edge.

The planing surfaces of the hull were modified from full scale practice in that they were made flat for increased planing efficiency. The only justification for a deep 'V' bottom is to absorb landing shocks and to reduce pounding which are of minor consequence at model speeds.

The forebody was lengthened somewhat to give a nosing-up effect on the glide-in landings, and a shallow 'V' was incorporated in the front portion for appearance and shock absorbing.

In the design of a flying boat the selection of the proper beam (hull width) is of paramount importance. The hull should be designed to be operating at its most efficient point at the same speed as the wings are designed to take the plane off. If the hull does not plane freely at the proper angle at take-off speeds, the wing may not be able to lift the plane at all..."

Quote: "from Air Trails July 195. 60 in span flying boat by Andy Lennon. Would make a nice EP RC. BTW Lennon's book, 'R/C Model Airplane Design' devotes chapter 11 to flying boat design."

Update 15/02/2019: Added article, thanks to RFJ.

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Article.

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Swan Song - completed model photo

Datafile:

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