About this Plan
Schoolboy. Radio control gas model, for .010 power and 2 channel RC.
Quote: "Small R/C is really big - good power coupled with assured reliability of the small-transistorized receivers make the small one a must for every dedicated radio control man worth his salt.
As any Schoolboy will show you, the new Cox Tee Dee .010 glow engine puts out more than enough power to fly a hot little radio job. That is, of course, if the airplane is designed so that the power of the .010 is converted into useable thrust rather than a big blast against a firewall. So let's see how the Schoolboy figured this out and got into the air so soon after the engine was available.
The Schoolboy is designed with a long tapered nose, since the 3 inch diameter prop for the .010 Tee Dee has to have a fairly clear area behind it for the blast from that small a blade to have any effective thrust. Aside from this feature, the rest of the model is so conventional and straightforward that it almost needs no construction directions at all. It's about as simple as you'll ever see, but the pleasing lines and the hot performance will give you a real source of fun while you're building that big beautiful monster with 'steen channels - and it'll keep on giving you a thrill or two even after the big one is done.
The name is derived, of course, from the fact that the model can easily be flown in any normal sized schoolyard - although you should get permission first, naturally. When I first heard that the LM Cox Company was going to market an .010, I naturally - along with a lot of others - wanted to see if I could come up with a successful R/C model for it. I'd experimented with the .020 a lot, had several successful designs, and knew the engine characteristics pretty well. I'd found out, for example, that with the little 3 bladed prop on the .020 flew my little seaplane with far more power than was required. This was a function of the engine placement up on the pylon above the wing, where the entire propeller disc was exerting effective thrust. I could probably have used that design, but I wanted something more along the classic lines of R/C.
So, using the basic layout of the proven cabin monoplane high wing design, I just stretched it out a bit, tapered the nose, swept the tail for the modern look, and in no time at all the Schoolboy was designed. The dimensions were set so that the fuselage would accommodate a standard Babcock compound escapement, a standard F & M Pioneer receiver, and two pen-cells for receiver power.
I built the model up rapidly, installed the radio gear, and mounted an .020 in the nose. All ready to fly, it weighed in at 10 ounces. There was no question of whether it would fly or not - I'd flown a similar model back in 1958 which weighed 15 ounces but needed a pretty-hot engine run to perform well. The first flight on the Schoolboy proved the soundness of the design - both aerodynamically and structurally. Frankly I forgot, in my usual first excitement, and neglected to put the prop on backwards. I launched the model, it screamed up and over in a tight loop and banged into the ground - hard. It was easy to replace the prop and glue the firewall back in place. The tough part was trying to heal my wounded pride - somehow these models always have a way of whittling you down to size when you get overconfident, don't they..."
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User commentsHad one of these when I was 13 years old, but never flew it R/C. Recently got back into flying and found the landing gear in my parts box and decided to build another, this time with electric power. It turned out to be a sweet little flyer. Thank You for providing these plans, they are great!!
OldBogey - 09/12/2014
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