Engine Development Program for the APL Remotely Piloted Vehicle.
JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB
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Performance of a custom-built Sakert-Riggs two-cylinder glow plug engine for use in the APL Remotely Piloted Vehicle was tested. Output power was less than expected, and plans to modify the engine to increase its power were foiled because of the early discovery of a structural weakness that showed up in every unit tested. An alternate engine was then developed, based on a low-cost proven design McCulloch that had been in quantity production for a number of years. This engine showed higher peak power and weighs more, but requires less than one-fourth the fuel at cruise power, primarily because it uses spark plug ignition with gasoline rather than glow plug ignition with methanol. Late in the test program, another brand Kolbo custom-built two-cylinder glow plug engine was introduced. Limited testing showed it to be a satisfactory, lightweight, but fuel-hungry engine. Author
- Pilotless Aircraft
- Reciprocating and Rotating Engines