Full Size Printed Plan 1950 Free Flight Wingspan 37" Engine ½ A Strato-Flash results: spectacular!

Full Size Printed Plan & Building Notes

No materials. Plan only

From 1950

Strato-Flash

Holder of world’s record for indoor microfilm model shifts to Cl. AA: results: spectacular!

Full size Printed Plan on a 35” x 24” SHEET

Three Pages of building notes and photos

Free Flight

Wingspan 37"

Engine ½ A  Original Engine Cub 49

By PETE" ANDREWS

   They laughed when I, the indoor addict, sat down-to build a gassie, for they thought t didn't know which end of the broom to use as a glue stick, but look what resulted! a high-performance. Class AA gassie with a wing loading of 21h:ounces per hundred square inches, a minimum drag body consistent with ease of construction, a new super-duper Slim pointed airfoll and' wing construction, retracting landing gear, and a long stab moment arm making the Strato Flash climb like a homesick' angel and glide like a seagull. Designing a ship that does not require downthrust, sidethrust, up-thrust, warped wing, or turned rudders, and yet is very stable, with a fast climb and a low sinking speed was quite a job; I'll try to explain my procedure step by step. Concentrating on the problem of airfoils, I realized there has not been much research on low-speed airfoils, so I fell back on my experiments with indoor airfoils and their characteristics. These experiments had convinced me that an airfoil with a sharp leading' edge, and a smooth arc form of the upper camber of from 5% to 6% of the chord would give me the best results, especially when used on a wing whose aspect ratio was approximately 6 to 1. To maintain a smooth airflow over the airfoil, I found it necessary to use sheet balsa to cover the forward rise of the upper camber as far back as possible without adding too much weight. This led me to the idea of using sheet leading and trailing edges, thereby saving quite a bit of weight

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