Hornet A (oz13770)

 

Hornet A (oz13770) by Paul Lindberg 1940 - plan thumbnail

About this Plan

Hornet A. Model aero spark ignition engine.

Quote: "Build the Hornet engine, by Paul W Lindberg. This month we present a little different project for the model fan: building a gas engine at home. The engine selected is widely used and reliable.

Due to the great number of requests from our readers, we are proud to present detailed instructions on building the Hornet model airplane engine. This engine is one of the latest designs and will give you many interesting hours of work in its construction. As to its practicability and performance, it is second to none for its bore and stroke. Cost of materials for its construction is about $2.50. At least 50 duplicates of the one shown here have been built and tested. They all are in perfect running order up to date.

Although many model enthusiasts have the idea that elaborate machinery is necessary to make a model gas engine, that is not true. To build one or two engines any home workshop with a machine lathe is all that is necessary.

To begin with, it is necessary to make a pattern of the crankcase. This is clearly explained on the plan. A split pattern is not necessary, as the foundry can make the parting in the sand. Any local foundry will gladly cast this in aluminum, at a nominal fee.

The crankshaft housing may be extended slightly, so that it can be gripped more securely in the chuck of the lathe. Make sure the pattern is finished to a high, smooth luster, as this will assure smooth cating. It will be necessary to clean up the casting after its return from the foundry. Do not drill holes in wood pat-tern for fastening down bolts.

Chuck the casting in a lathe, as shown in photo. Cut back required depth as shown on detailed print. Diameter of hole is 31/32 of an inch. After this part has been finished, a hole is drilled through remaining part of casting to receive main bearing. Note: The size of this hole is .002 inch under 5/16 inch, so that main bearing may be pressed into place. Do not press the main bearing into the crankcase casting until it is completely machined. With the casting still in the chuck, thread that portion of the crankcase which receives the crankcase cover. It will be necessary to have a thread-cutting lathe for this operation..."

Direct submission to Outerzone.

See also build thread on RCGroups https://www.rcgroups.com/forums/showthread.php?2857462-1939-Lindberg-Hornet-A-Motor by Ed Crowell.

Supplementary file notes

Article.

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Hornet A (oz13770) by Paul Lindberg 1940 - model pic

Datafile:
  • (oz13770)
    Hornet A
    by Paul Lindberg
    from Popular Aviation
    January 1940 
    0.23 cu in
    Engine Spark
    clean :)
    complete :)
    got article :)
  • Submitted: 14/04/2022
    Filesize: 314KB
    Format: • PDFbitmap
    Credit*: Pit

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Scaling

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