Felgiebelmotor FG2 (oz13762)

 

Felgiebelmotor FG2 (oz13762) 1984 - plan thumbnail

About this Plan

Felgiebelmotor FG2. Model aero engine.

Quote (google-translated from the German): "This article deals with the construction of a model aircraft engine from the year 1941. At that time the model builder did not have many options when choosing his engines. Ready-to-run engines were available from Brown, Kratzsch, Häusler and a few others. The performance data of these engines cannot be compared with the model engines commonly used today. The maximum speed was around 5,000 rpm with a power output of around a quarter of a horsepower per 10 ccm.

In addition to ready-made engines, some manufacturers also offered blueprints and cast parts for self-construction of an engine. Complete construction documents were even published in book form for some engines. One of these construction documents in book form served as a template for this engine. This is the 1941 book 'Gasoline engines for model aircraft and building them yourself' by A Felgiebel.

This book describes two do-it-yourself engines, the 7.6cc FG1 and the 14.3cc FG2 which was chosen for the replica. In the following, a brief overview of the construction of this engine is to be given, as the mode of operation is almost self-explanatory.

The LINER also serves as a cylinder. It is turned from tool steel. The carburetor tube and transfer channel are hard-soldered to the cylinder with silver solder. The running surface for the piston is finished to size by hand on a small lathe using a self-made mini grinding device. The biggest problem is the casting of the CRANKCASE. The crankcase of the engine is fully cast from aluminum and turned inside. First, a wax model was formed for the mould. As a first attempt, the molten aluminum should be poured into plaster. For the production of several castings, the wax model was molded with a silicone mass in order to be able to quickly mold new wax models from it. The wax model was then molded into plaster and, after thorough drying, melted out of the plaster so that a negative mold was created. The aluminum was melted with a propane gas burner in a casting ladle and, after skimming off the slag, poured into the negative mold. When the melt solidified, the plaster mold did not crack, but residual water diffused out of the plaster, which reacted with the aluminum and caused a lot of smoke to develop..."

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Supplementary file notes

Article, in German.

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Felgiebelmotor FG2 (oz13762) 1984 - model pic

Datafile:
  • (oz13762)
    Felgiebelmotor FG2
    from FMT
    July 1984 
    14.3 cc
    Engine Spark
    clean :)
    complete :)
    got article :)
  • Submitted: 10/04/2022
    Filesize: 296KB
    Format: • PDFbitmap
    Credit*: LelakiKelakar
    Downloads: 326

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Download File(s):
  • Felgiebelmotor FG2 (oz13762)
  • Plan File Filesize: 296KB Filename: Felgiebelmotor_FG2_oz13762.pdf
  • Supplement Filesize: 2208KB Filename: Felgiebelmotor_FG2_oz13762_article.pdf
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