U2 (oz13324)

 

U2 (oz13324) by Frank Warburton from Aeromodeller 1961 - plan thumbnail

About this Plan

U2. Control line stunt model.

Quote: "54 inch span fully aerobatic controliner for 5 to 8 cc engines. Already a winner in its first season. U-2, by Frank Warburton.

THIS MODEL WAS built with the specific idea of producing a new and more realistic look in stunt models, while retaining good handling characteristics. The novel UC has been well tested and gives perfect and very positive take-offs and landings. Wing tip fins were added at a later date, and were found to give steady pull-out throughout all manoeuvres as well as adding realism.

The U-2 employs normal constructional methods and should offer no difficulties to the average builder. The nose is slightly longer than usual enabling very smooth manoeuvres and the fairly high aspect ratio wing gives small turning radius and consequently good tri-angles and hourglasses.

The wing is commenced by cutting the ribs from soft 1/16 balsa by the sandwich method. For this purpose 1/8 ply templates of R1 and R14 are cut. 14 rib blanks are then sandwiched between the two templates and sanded to shape. Remember that on the starboard panel, R14 will not be required. The mainspar slots are cut with a razor saw. Note: the holes for the back lead-out must be angled up, and those for the front, down. The T/E is spliced and pinned to the board suitably packed. The mainspar is butt-joined and the ribs slotted on it - do not glue yet. Cement ribs to TE and add LE, followed by top TE piece. Remove wing from board and add TE cap, bell-crank platform and assembly complete with push-rod and lead-out wires. Cement LE and CS sheet in place. Pack 1 ounce tip weight in starboard wing. The ribs are now cemented to main spar. Cap the ribs with 1/16 x 1/4 in soft strips. Hinge 1/4 in sheet flaps and connect both pushrods.

Cut medium 1/8 sheet fuselage sides and cement 1 mm ply doublers to inside faces. Carve away section under wing and save for later. Drill engine bearers with 2 degrees offset and pre-cement to F2 and F3 after bolting UC to F3. Pre-cement sides to this assembly and fit tank on level with needle valve. Cement F5, F6 and F8 in place.

At this stage the fuselage is firmly cemented to the wing, checking for zero incidence, and the tail brought together by F16, hold with rubber bands until dry. Slide F12-15 down pushrod and connect tailplane to pushrod. The tailplane is cut from soft 1/2 in sheet, with 1/16 ribs added. Slide the tailplane back and forth to achieve neutral flap and elevator, then cement to fuselage. Add tail cone and remaining formers, replace cutaway section under wing. Then plank top and bottom with soft 3/32 strips, after tail-wheel, sewn with fusewire to 1/8 ply former, has been cemented against F15.

Cement on nose block, slotted for F2 and F3 and hollow out for cockpit. The cowl is made from 1/2 in and 3/16 sheet and carved to shape. Build fin on plan, sand to section and cement into position. Push protective, piano-wire cockpit hoop (crash arch) into nose block add pilot and cockpit details, etc. and Evo-Stik canopy into place, follow by alluminium pilots windshield frame with celluloid on its inside, to the canopy.

Give the whole model two coats of sanding sealer and sand smooth, cover the fuselage with lightweight tissue and apply sanding sealer until smooth gloss finish results.

Heavy weight tissue is recommended for wing, tail and fin covering, silk is rather heavy to work with on this model. Give three coats of clear dope and three of final colour, wet sanding between each. Finish with two coats of fuel proofer and wax polish.

Balance at indicated position. The original weighed 38 ounces, but up to 44 ounces is tolerable - remember the lighter the better! Many top-line fliers have flown the prototypes and expressed their satisfaction at its ability to get through all manoeuvres - in fact they all liked it very much - how about you having a try?"

U2, Aeromodeller, August 1961.

Direct submission to Outerzone.

Supplementary file notes

Article pages, thanks to RFJ.

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U2 (oz13324) by Frank Warburton from Aeromodeller 1961 - model pic

Datafile:
  • (oz13324)
    U2
    by Frank Warburton
    from Aeromodeller
    August 1961 
    54in span
    Scale IC C/L Military
    all formers complete :)
    got article :)
  • Submitted: 05/04/2021
    Filesize: 858KB
    Format: • PDFbitmap
    Credit*: Circlip, RFJ

ScaleType:
  • Lockheed_U-2 | help
    see Wikipedia | search Outerzone


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Scaling

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