ABC Robin (oz8755)

About this Plan

ABC Robin. Free flight scale model for CO2 power, from MDD (Model Design & Drafting). Wingspan 25-1/4in. Telco CO2 engine shown. Scale is 1/12.

Scan from DBHL, cleanup by theshadow.

ref DBHL-6338.

Direct submission to Outerzone.

Planfile includes detailed build instructions.

Quote: "Introduction & general notes: The ABC Robin was built by ABC Motors Ltd in 1929. Only one built, G-AAID, scrapped in 1932. The main dimensions are 25 ft 4 in span 17 ft 7 in length. Colour scheme - black fuselage, orange wings, tailplane, fin/rudder & wing struts silver nose, from u/c fwd, u/c black & silver registration letters, black on wing, orange on fuselage.

Study the plan before building. Cover plan with thin polythene for protection. As the model is mainly made up of strip, use of a balsa stripper is strongly recommended, also only use 2 in wide sheet if available & only strip up to 12 in lengths for economy. Use of adhesives should be kept to a minimum as too much glue adds unwanted weight. Use balsa cement or thinned PVA. Use only PVA or latex on foam if used. Use cyanoacrylate for glueing u/c into fuselage - this can also be used to build all the model, but watch those fingers, it's very quick.

Fuselage details: Build side over plan, don't pin through the 1/16 sq. Build 2nd side on 1st side, remove when dry, carefully separate. Glue stern posts together make sure front is level. Cut crosspieces on plan, glue in place, start at back & working forward, pre-glue joints, check squareness of fuselage often. Add 1/32 window frames flush with outside. Add F1 after glueing ply in place & drilling engine bolt holes. Cut & fit foam for tank add F2 - F3 plus valve & mount sheet with 1/32 sht or use foam, use F2 & F3 as templates for shape. After bending u/c wires check fit in fuselage but don't glue. Do tailskid also if F4 not fitted, glue in place, add crossbrace & sheet over. Tissue fuselage in black after lightly sanding. Fit & glue u/c & t/skid after doping, 3 coats max.

Engine & cowling details: Engine may be mounted with bolts or woodscrews, but use ply in both cases, see f1 for size & position. Engine is shown with 0° down thrust & 3° right thrust. Complete flight tests before adding cowling. Remove prop & screw 1/32 ply disc, 13/16 dia to engine. Glue balsa or foam in place & sand to shape, leave clearance between cowl - add balsa or foam for spinner- sand to shape for foam, apply tissue with thinned PVA when dry lightly sand & paint. Use dope only on balsa.

Wing construction: cut ribs R2 as shown + 2 x R1 & R3 - build tips on plan, remove when dry pin down te & spars, don't pin through spars. Add ribs, angle R1 with gauge add LE & top spars glue R4s in place, add tips, then R5 & tip gussets. Glue TE gussets in place. Glue root LE pieces & remaining gussets in place. When wings completely dry remove from plan carefully sand to section. Place wing flat on edge of board when sanding TE. When finished sanding cover wings swith orange tissue, use thinned PVA glue to stick tissue or your own pet method. Cover top first & wrap under when dry, water shrink, & hold down on flat surface to prevent warping. When tissue dry, give wings two or three coats of thinned dope holding down on flat surface between coats. After 1st coat, attach black tissue registration letters with 2nd coat of dope. Give 3rd coat if required & sand lightly between coats.

Finishing, trimming & flying: When all parts of model are finished, do a check fit leave struts overlength at fuselage end & trim to fit, then cover them assemble model, check for symmetry. Mount engine & balance model at point shown test glide in calm conditions & add weight to get a floaty glide, or just off stall.

For first power flights use low power & fill with filler valve pointing to ground. Increase power gradually for next few flights. If model stalls under power, take out top bolt in engine & slip thin washer behind engine, refit bolt & try again, repeat until model climbs without hanging on prop. With sidethrust shown model should should fly straight or with gentle turn. Adjust rudder to give large right turns under power & on glide. Many happy hours of flying - & good luck - Bert Hatton MDD."

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