Frog 45. Free flight power sport model, for the Frog 175 engine. Winner of the Bowden International Trophy at Fairlop in 1947.
Quote: (from FROG Model Aircraft, Lines and Hellstrom, 1989) "Perhaps the most important event of 1946 was the announcement and production of the 175 miniature aircraft petrol engine and the FROG 45 flying construction kit specially designed, by Buffery, for it.
The 175 was actually designed by George Court, an engineer with Vickers. He sold the idea of producing such an engine to IMA and received a royalty for each one sold. Engine production was very different from anything IMA had attempted before but it was accomplished quickly and efficiently thanks largely to Judge who had the feel for such things.
The FROG 45 - '45' being the wingspan - was to have a 15 year life. Its design was masterly, a compromise between simplicity, ruggedness and economy, yet having the capability of exceptional flying performance. It was produced practically unaltered up till 1953 when the Mk. II version was issued. More of the '45' later.
The 175 engine was introduced at 75/- (£3.75) a very keen price. It opened up the market for power flying models and gave IMA a good start upon which to build..."
This is a hand-traced plan showing the original Frog 45 design, the kit released in 1946. The Frog 45 was later re-designed as the Frog 45 MkII (oz2249) in 1953.
Scan from DBHL, cleanup by theshadow.
Direct submission to Outerzone.
Many thanks to RFJ for help with this one.
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