Gullable (oz11709)

About this Plan

Gullable. Vintage style sport model for .20 to .25 engines and 3 function RC.

Quote: "THE only gull-winged plans I'd ever seen were of gliders and the American Spook (oz11046) a vintage high-wing cabin model.

I'd always liked the idea of a cranked-wing configuration and when my OS 20 four-stroke and a set of R/C gear became idle, I thought - this is it!

I planned for a wingspan of about 56 in and a fuselage length of 32 to 33 in. I asked numerous questions to learned club members regarding wing and tail incidence, CG position and then took the average answer - zero degrees, relative to the fuselage datum and the CG position calculated as shown on the plan.

Let's get going: The tail and elevators are conventional 3/16 square balsa with the tips from 3/16 sheet, sanded to aerofoil section with the top half of the fin built on. The lower fin was built into the fuselage after cutting away the spine and opening out the formers. The top of this lower fin terminates in a 1/8 ply platform onto which the tailplane is glued.

For ease of construction, I cut the slot and bored the hole for the elevator snake outer and clevis area. This was the most awkward part; silver soldering the central control horn to the elevator joining bar at the correct angle so as to meet the snake in a smooth flowing curve needed more than one try. I found that Bowden cable gave better results than the normal white plastic inner. The fuselage spine and keel were laid down first and the half former's glued in place. Enough planking in the centre area was added to enable the whole side to be removed without it bending. The reverse formers and planking were then added and the two undercarriage tubes were wired and epoxied for formers F1 and F2. The planking was then completed down to the keel centre-line, tapering where necessary.

The servo tray, snake tubes and tank were next installed. The 40oz tank fits between the engine bearers with the feed tubes passing through the 1/4 in ply F1 to hold it rigidly in place. The remainder of the planking, up to the wing seat, was then completed. The seat has a 1/4 in square coaming let-in and the tops of formers F2 and F3 were then cut down to this level.

The wing is retained by two nylon bolts to the rear, with captive nuts epoxied into a ply plate - supported at both ends - and a ply tongue at the front which locates in a recess in the upper fuselage block..."

Gullable, RCM&E, October 1990.

Direct submission to Outerzone.

Supplementary file notes

Article pages, thanks to RFJ.

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