Swee Pea and Stinger (oz10403)
About this Plan
Swee Pea and Stinger. Control line profile racers.
Quote: "A pair of mini Goodyear racers for engines up to 1.5cc designed by Chris Coote.
MINI-GOODYEAR racing is fun! The models are cheap to build, quick to make, easy to fly, and do not require expensive engines - and thus they appeal equally to Juniors and fly-for-fun modellers who would like to try their hand at a little racing without getting too involved. Even if you have no wish to race, these little models make good, robust trainers when fitted with any beam-mounted engines of 0.5 - 1.5 cc capacity.
Following the first competition for these models at the '75 Nationals, it became apparent that the flying qualities of some of these models in the unfavourable weather conditions, left quite a lot to be desired. In an effort to overcome some of these shortcomings a search was made for a suitable pro-totype with the desired aerodynamic characteristics.
The main problem with Mini Goodyear racers is that the motor constitutes some 50% of the total weight, thus creating an excessively far forward CG position, leading to lack of control response. It was obvious that Goodyear prototypes favoured for the 1/8th scale SMAE Goodyear event eg Argander, Ginny, Owl, were not the optimum choice for the 1/12th scale class with relatively heavy motors. Hence Swee' Pea - it has the shortest nose of just about any Goodyear combined with good wing area and an interestingly different V-tail configuration.
Next design to catch the eye was the Stinger - an attractive machine, but with a somewhat longer nose moment. However, this is by no means excessive and provided a reasonably light engine (ie not a ball race unit) is fitted, then it will be fine - it certainly flies smoothly. They both proved particularly economical to build (and hence attractive to Juniors with their limited budget) requiring little more than one sheet of 1/4 x 4 in and half a sheet of 1/8 in x 4 in hard balsa apiece. Note that hard balsa is specified; most of the wood is behind the CG so harder, heavier wood will save having to add useless tail ballast..."
Scan from DBHL, cleanup by theshadow.
Direct submission to Outerzone.
Update 04/09/2018: added article, thanks to RFJ.
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