[ATTACH=CONFIG]237409[/ATTACH][ATTACH=CONFIG]237410[/ATTACH][ATTACH=CONFIG]237411[/ATTACH]

The Praga ‘B’ is more closely related, certainly in cylinder head and crankshaft bearing detail, to the original E113, not the subsequent A,B or C models. Students of the pre-war Aeronca will know that the original E113 used Warner Scarab derived cylinder heads supplied by the Govro-Nelson Company of Detroit. Hopefully three photograph are attached to this post, two showing the Praga ‘B’ (early single ignition version), and detail from the Aeronca E107 – E113 Engine Manual.

The later parallel valve E113A, B, C, and JAP J99 cylinder heads were undoubtedly much easier to produce; certainly in casting complexity and machining fixtures and processed alone. The E114 suffix denotes the slightly larger swept volume of the Praga engine; 1904 cc compared to the 1860 cc of the E113/J99.

The Praga also uses roller big end bearings similar to the E107, E113 inc. A and B models. The E113C and the JAP J99 have plain bearing big ends. (Plain bearings might seem a retrograde set but my last JAP big end overhaul cost £180 all in, crank polishing and crack testing included).

None of this delightfully whimsical wind and pips has turned up a photo of G-AEYM. Would a kind person, competent in the use of photoshop or similar, be so kind as to doctor a photo of one of the others, pref. with that naughty Mr Joyce at the controls!