USA-56. Rubber sport model.
Quote: "Training Plane. USA-56, by Paul Del Gatto.
Pan American's gas-powered cargo event without a doubt is one of the most exciting of all events, and each year its audience keeps growing. This is the type of event where you can ask - Who's first? - only after the last flight of the day has been made; for until that time the lead keeps shifting with virtually every flight made.
Once having set down the rules and flight procedure we were able to go on with the design of a model. As our first endeavor in a rubber-powered cargo design we decided on a standard type of model, completely functional and simple to construct from every aspect.
Construction is easy, particularly with the aid of the construction sketches found on the plan.
The covering of the model if neatly done will contribute much to its success structurally and performancewise. For a finish, three coats of thinned-down dope will be sufficient prior to testing the model. After preliminary flight tests and adjustments have been made, add another coat of dope. Between applications rub down the surfaces with fine sand-paper.
On the original model we made our best flights with a hand-carved propeller as shown in the plan, but since that time we have also done a lot of flying with a Paulowina prop and likewise obtained some very good results. So if you feel hesitant about carving your own propeller, start off with a Paulowina. Your local hobby dealer should be able to supply you with this item.
Power your model with 20 to 24 strands of 3/16 T-56 brown rubber 24 in long. Use two to four strands less with the Paulowina propeller.
When you reach the flying stage, re-member not to get over-anxious. Think about what your next move will be before you make it. Add cargo in small amounts up to about one-half ounce for each new cargo attempt after a previous successful attempt. When you get above eight ounces you might find it better to increase the cargo in one quarter of an ounce units. Use only a moderate amount of turn. Remember, you are carrying cargo now, not sniffing thermals.
Rubber Powered Cargo Rules:
1. Maximum wingspan 30 in.
2. Maximum prop diameter 10 in.
3. Maximum distance between motor hooks 18 in.
4. Must be glided with cargo from a height of 5 ft before each flight, without damage.
5. Must fly 20 seconds and land without damage to plane or loss of cargo.
6. Cargo must be enclosed.
7. Folding, freewheeling or feath-ering propellers not permitted.
8. Heaviest weight lifted wins."
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