September Warrior (oz5391)

About this Plan

September Warrior. 30in span control line combat model, for 2.5 to 3.5cc power, designed by B.R. Bumstead and published in Model Aircraft in November 1963. Twin boom layout of approximately 225 square inch area. Original powered by Rivers Silver Streak.

Quote: "BR Bumstead's highly successful combat design for 2.3 - 3.5 cc motors

No claims are made for originality in this design; the basic layout being taken from an original concept by Riley Wooten. However, modifications to detail and overall size have evolved September Warrior as a new design - inasmuch as any design can be called 'new' nowadays.

The important characteristics of the model should be noted so that if modifications must be made, then they should not interfere with:

(a) the blunt, rounded LE for manoeuvrability without stalling or mushing.
(b) the surface-sparless wing for a laminar flow of air through the majority of the boundary layer around the wing - giving the minimum of induced drag.
(c) the tips, which being curved as much as simple construction permits, have the minimum of profile drag.
(d) the flying tail, which, besides being conveniently detachable, requires only 20 deg. of movement each way, thus further enhancing non-mushing qualities, whilst executing suddenly applied, tight manoeuvres.

The construction is simple but must be really accurate, especially the fuselage. This point cannot be over emphasised. If built exactly as specified, the fuselage assembly will always be a strong, rigid, fixture to the wing - a feature important for eliminating all vibration and contributing to an all important smooth engine run. Thus, whilst building this model, at all times bear in mind three important factors, namely, accuracy, lightness and the knowledge that one really good model is worth more (and takes less time to build) than as many warped, underdoped - yet heavy - and poorly finished models, that one cares to mention.

Construction The LE should be built from three laminations of 1/4 in sheet, the outer laminations being hard balsa with soft balsa in between. Evostick or PVA the laminations together; in the latter case securely holding the laminations with pins and rubber bands whilst setting and, in both cases, ensure that the assembly is dead square and straight. When set, mark out the rib positions and cut slots..."

Update 07/07/2016: article pages, text & pics added, thanks to RFJ.

Supplementary file notes

Article.

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