Model Aeroplane Notes

Auckland Star, Volume LXIII, Issue 125, 28 May 1932, Page 3 (Supplement)

Model Aeroplane Notes

THE CONTEST BABY R.O.G* MONOPLANE.

A COMPETITION WINNER

For tlie more advanced model aeroplane builders I have no doubt that this fine indoor monoplane will prove a very interesting model to construct. It is based on an American model whiph lias done over five minutes indoors. The material required is as listed below:—

MATERIAL REQUIRED. Key. Name of part. Material. Size. No. required. A Fuselage spar Balsa 8 x 1-8 x I Mi 1 B Wing spars , 3 x 1-1(5 x i-;:l' -1 C Tail boom 61 x 1-10 x 1-32 1 D Kibs „ 2J x 1-16 sci. 7 K Wing ends „ 1 3C 1-64 ssq. 2 F Elevator spar „ Ox 1-32 sq. 1 G Rudder outline „ 6 x 1-04 sq. 1 H Propeller 4i x 1J x i 1 I Wheels „ £-lnch round x 1-16 2 J Undercarriage Bamboo 1-32 x 1-1G x 4 2 K Under strut 1-82 x 1-16 1 Ij LI Wing clips Piauo wire 27 s.w.g. 2 M Hear hook „ „ ~ .. 1 N Bearing ." Aluminium 21 s.w.g. 1 0 Can , Piano wire 27 s.w.g. 1 PPI Wheel axles „ „ ~ „ 2 Q Propeller spindle .... „ „ ~ „ 1 , Kiibber, cement, tissue covering, small bead.

Construction. Take the fuselage spar A, and taper it towards each end as shown, using the very finest class paper. Now make up the bearing N, keeping it very light, the hole for the propeller spindle being 3-16 of an inch above the spar. Cement into place. Cement the cam or guide 0, and the rear rubber hook M, into place. The under-carriage J is made from tiny slivers of bamboo. With a small drop of balsa cement glue int oplace. Fix the

strut K in the position shown, and cement the wheel axles PI into place. The wheels I are kept in place by a small drop of cement. You will see from the construction that the enipenage or tail gear is carried aft on the tail boom C, and that this is offset from the line of thrust a quarter of an inch. This gives the circling movement. Note also that the elevator spar F is at right angles to the line of thrust, not at right angles to the tail boom. The paper covering on the elevator is cut to shape and stuck with very light adhesive paste. Note

there is no thread or balsa required. The rudder G is formed by bending a thin balsa spar, dampened, round an electric light bulb. Cement into place and cover at one side only. The tail boom ie cemented to the main spar with a fairly heavy application of balsa cement. The Wing. The wing is formed in two halves from the four wing spars 13. The angle at the ends is formed by cracking the balsa and applying a little cement to regain the strength. The ribs are bent in a similar manner to the rudder outline. Join the two halves together, giving the required dihedral angle as shown in the sketch. Cover each half separately with fine Japanese tissue. Make the clips L, LI and cement into place. As this is a high wing monoplane the front clip should hold the wing a little over 1-10 of an inch higher than the back. The propeller can be made Scotsman fashion by cutting the block in two diagonally on the ljin face, as shown. The wedge ends are cemented together, an overlap of half an inch being allowed. The propeller must be not more than 1-16 of an inch in the centre, and taper to paper thickness along the blades. Take your time over the propeller, as the success of the model depends mainly on this. Looking at the model from the front, the right end wing must be given a greater angle of incidence in order to stand the torque cf the large-sized propeller. Two strands of very thin one-eighth inch wide rubber will fly this model. If rubber lubricant is applied, and a winder used, about 2300 turns can be given. The rubber i motor should be 2Jin longer than the dis-

tance between Q and M. It sounds incredible, but this model can be finished to weigh 1-15 of a nouncc. It calls for very careful and painstaking construction, but will amply reward, the builder by its wonderful flying capacity. Here is a, model that will win you competitions and help you to break records this winter. A kit-set containing the necessary materials for making the Contest Baby K.O.G. monoplane will be sent you upon receipt of a postal note for 2/3, addressed to Propeller, care "Auckland Star."