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Frog 150 Mk I

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Frog 150 Mk I

Type Model: Diesel STD
Engine Size: 1.5cc
Company: Frog
Year of Manufacture:
Test by: AeroModeller September 1951

Details:

Publisher:Frog-Engines
Edition:British
Keywords:Frog-Engines, Frog-Tests
Rating:0.00 (0Vote(s))
File size:547.3 KB
File Type:PDF
File Quality:Clear
Added by:hlsat
File:Frog 150 Mk I
Link to URL:https://flyinghlsat.com/details.php?publication_id=12394
The FROG 150 made its market debut in June 1951 over a year after the appearances of the Allbon Javelin and the Elfin 149. In many ways it was quite similar to its two leading competitors featuring radial porting allied to FRV induction and a plain bearing crankshaft.

Its a largely forgotten fact that at the time of its introduction the FROG 150 was offered in both diesel and Red Glow glow-plug versions at the same price of 2 9s 6d (2.48). However the glow-plug variant doesnt seem to have lasted long on the market by December of 1951 it had already disappeared from IMAs advertising. Examples are akin to hens teeth today. Presumably like the ill-fated Allbon Arrow it under-performed by comparison with its diesel counterpart.

Bore and stroke of the FROG 150 were nominally 0.500 in. (12.70 mm) and 0.460 in. (11.68 mm) respectively for a displacement of 1.48 cc (0.090 cuin.). The engine weighed a checked 3.31 ounces (94 gm) complete with tank and fuel tubing.

Bypass and transfer functions were accomplished through the use of three internally-formed flutes in the lower cylinder wall. These were located between three milled exhaust apertures of generous proportions. The transfer ports overlapped the exhaust ports to a significant extent. A conical-topped piston was employed.

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