Jackdaw II. Sport model for rubber power. Semi-scale design to 1/12 scale. 2-3 seater.
Quote: "FEATURED on our front cover this month is 'Jackdaw II,' a 1/12 scale semi-scale two-three seater plane weighing 5-1/2 to 6 ounces. Wing area is 1 square foot, and flights up to 2 minutes duration may be obtained without the aid of thermals.
This 'plane has been designed and constructed by Mr C R Moore, with a view to placing in the hands of aeromodellers a scale type of model of good performance, built entirely without balsa. The model has a geared up motor, driving a hardwood airscrew.
Full-size scale plans, of which a 2/5 reduction appears on pages 256-7 of this issue, are available price 2s. post free, through the AERO-MODELLER Plans Service. Particulars of an interesting competition in connection with 'Jackdaw II,' together with full building instructions, are on page 246-7.
Note. Two layers of 1/32 sheet can be used in place of 1/16 sheet throughout.
Materials. Spruce, particularly silver spruce, is excellent material except for steam bending, when birch is rather better. Birch can be used throughout, but the sections in the wing spar should be reduced as the wood is somewhat heavier, 1/16 x 1/16 in can be used instead of 1/8 x 1/16 in, and diagonal bracing added from rib E to C. Again, the TE can be cut to 1/8 in wide. The new PSS wood, advertised in this journal, is ideal for the job.
Veneer of about 1/64 in is obtainable at most model shops, but if you can't get it, wood 'spills,' procurable at most tobacconists, are satisfactory, providing the straight grained ones are chosen for ribs. The leading edge can be covered with these spills end to end or, if preferred; the covering can be abolished and riblets added made, as the wing ribs, of two-ply 1/64 x 1/8 in. When using 1/64 in sheet as covering it is wise to banana oil as soon as set to prevent damp wrinkling the surface. Stringers may be used in place of the sheeting above and below the nose. Durofix or similar cement should be used in place of balsa cement and all joints should be left undisturbed until thoroughly set, which is usually several hours.
The Fuselage. Steam bend the longerons to shape and build as usual. Join tail end, fit jigs, steam bend sides to meet nose former and proceed as usual, The former X is two or three layers of 1/64 in. sheet wrapped round a cardboard template similar to the wing tip, cemented together and bound till dry..."
Hi Steve and Mary, Here is another plan for the library: Jackdaw II - A 35 inch wingspan semi-scale rubber model by C. Rupert Moore, published in The Aeromodeller June 1942... TTFN,
Direct submission to Outerzone.
Update 04/10/2018: Added article, thanks to Mary, from https://rclibrary.co.uk/title_details.asp?ID=2280
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This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.
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