Whittman Buttercup. Scale model utility light plane from April 1952 Flying Models, for .020-.049 power.
Quote: "This semi-scale 1 /2A version of Steve Whittman's famous utility light plane features simplified flying surfaces. Buttercup, by Dick Struhl.
Presented here is a free-flight semi-scale version of Steve Wittman's 'Buttercup' utility lightplane. The original acts as the flying workshop and delivery wagon for the racing team of Wittman and Brennand. Our model counterpart acts merely as a means of having some good consistent flying over weekends.
We chose to power this model with a 1/2A engine and build it to the approximate scale of one inch to the foot, giving a span of 28-1/2 in. The original model was powered with an .020 Infant, and put in several hundred fine flights before a larger Baby Spitfire was installed. Flights with the Infant were slow enough and yet realistic enough to give plenty of fun.
The model was adjusted for a steep glide (no downthrust) so that we could fly on a full tank of gas and still be reasonably certain that the model would return to us. With the larger engines, you will find it necessary to install downthrust in the en-gine and also use some type of de-thermalizer, such as a pop-up tail, etc. There is no question that, if you get the model up high enough, you are going to lose it out of sight..."
Update 25/01/2019: Added article, thanks to RFJ.
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