About this Plan
Cupid -1/2A control line team racer model. This is a semi-scale model based around the Neal Loving WR-1 Love midget racer of the 50s.
Quote: "Start AA racing with a model that meets the semi-scale requirements in full. Cupid, by Ron Moulton.
The SMAE specification for a team racer holds that models shall be either scale or semi-scale. How we digress from that elementary requirement in our class A racers of today! Any rule-abiding jury with the fortitude to withstand the abuse of would-be competitors might be fully justified in eliminating 25 percent of the entry in some of our contests.
Let's get away from the dangling undercarriage, external fuel filter, postage stamp fin, ruler winged, short fuselage, pimpled canopy Class A monstrosities that appear with depressing monotony, and take a leaf out of the Don Walker Class B racer book. His designs, flown so successfully with Ray Tuthill engines, have shown the way to will with the fastest - and realistic models.
Speed is not necessarily a function of how small one can reduce a chord or fuselage - it is derived from practical streamlining and we hope that in the newly-instituted Class 1/2A consideration for appearance and streamlining will stem the degeneration which has overtaken the 2.5 cc class.
The structural specification for 1/2A calls for a 1.5 cc engine, 55 sq in (including the area within the fuselage) projected wing area, 10 cc fuel tank, 11 in x 24 in cockpit, 1-1/4 in wheels and 38 ft 2-1/2 in lines (110 laps equals 5 miles). From experience we can expect an ultimate performance of 70-80 laps at 75-85 mph, but that is looking perhaps two seasons ahead when development is butting its never-satisfied head against the tough barrier of purchasing power and who can afford the fastest engine. For the moment let's enjoy life with a healthy, cheap, plain bearing 1.5 and be satisfied with loads of fun and a range of 30-40 laps at 70 mph. That's the figure we claim for Cupid, not unnoticeably derived from Neil Loving's wonderful little homebuilt, and as snappy a model to fly as is the full size.
Scale has to suffer (shame!) with the 1-1/2 in wheel requirement and the need for prop clearance and ground stability with a forward centre of gravity - here we must also pen the advice of using one of the new BMA (Skyleada) solid dural spinners to take the occasional landing tumble when the wind gets under the tail.
The original had an AM .15 and straight from the first flight it was obvious that little Cupid was a fast piece of work. Clocked at 65 mph with a 6 x 9, it held the flight straight and level as though in a groove, and with a minimum of line tension (weight is only 8 ounces - with fuel). Using 6 x 6 or 6 x 8, speed improves to 70 mph plus.
Our only word of caution calls for full-up elevator w keep the tail down during take-off and landing, and if your building has made the model excessively nose-heavy, drag the CG back to position prior to the covering stage, by adding ballast in the space over the tailplane. All set? Cupid needs only four sheets of 3-in balsa and three pieces of strip plus sundry scrap and ply, so it's a cheap good-looker that can be ready for test flights in remarkably little time.
Construction details are included on the plan and it is recommeneded that one starts right at the heart of the model - the engine. This will determine your mount spacing so the first thing to do is to cut the bearers to length, bolt them to the engine and make the two ply bulkheads fit over them..."
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