In Alec Lumsden's book, "British Piston Aero-Engines...etc", on p 164, he says, "The Company (Napier Ltd) was also asked to build Sunbeam Arab engines. These were not satisfactory and Napier (i.e. Montague) was convinced he could design something better. In July 1916, he had begun design of a...
There's only about a page and a half on the Juptier in Dyke's.
If you want some real detail you need to look at Lumsden "British Piston Aero-Engines etc" which has about 7 pages devoted to the Jupiter.
"Fedden" by Bill Gunston (RRHT) has a lot on the Jupiter as well.
Cheers, J.
"Dyke's Aircraft Engine Instructor" is quite a big book; well over 400 pages.
It is a quality publication and as good a reference for pre-1930's engines as you can get anywhere.
Copies are regularly up for sale on "Abebooks" and E-Bay usually at reasonable prices.
In my opinion, well...
Another great photo, Alain. What is that structure at the front of the engine in the centre, labelled "o" or "d"??
Above is a photo from the Kotelnikov book. The caption says it is VK-105 but there appears to be SEVEN exhaust ports along the side which seems to suggest it is a VK-107. Is...
Well done, Mr Wuzak. Got it first time. Give the man a prize!
Yes, there is something peculiar regarding the top drawing. If the No. 1 and No. 6 crankpins are pointing upwards, then all the others should appear below the centre line, as indicated by the crankcheek drawings underneath...
Here's a little puzzle to finish up this thread.
Above is a drawings page from a very long and detailed report by Allison engineers on the 12 counterweight crank.
The top pic is a side view of the whole crankshaft and below it are individual drawings of each of the crankcheeks and...
Many thanks to Wuzak for some great pics. I was beginning to think the 12 cwt crankshaft was a myth! So, now we know - there were four symmetrical counterweights and eight skewed.
Anyone interested in some more info on the 12-cwt crank should download a copy of US Patent No. 2,419,274 from...
Firstly, commendations to Alain Bretoal for the nice bit of artwork showing the port arrangements for the HS 12Z and the VK-107.
Even so, the cylinder head on the Russian engine was COMPLICATED! Hope it was all worth it in terms of a better running and more powerful engine.
Gunston (p173)...
It would be nice if someone could come up with sectional drawings of the VK-107 because this was the version that featured four valves per cylinder.
Given that the inlet and exhaust ports were on the same (outer) side of the cylinder blocks, then the cylinder head must have been cross-ported...
All very interesting, I'm sure but I am still looking for photographs and/or drawings of the 12 counterweight crank fitted to the later models of the Allison V-1710.
The models affected were the F 28/29 (-121/123) or the E 21/22 (-117, -109).
Has anyone got a manual or instruction book that covers one of the late-model Allison V-1710 engines which were fitted with 12 counterweight crankshafts?
This type of crankshaft gets a lot of mention in the Dan Whitney book on the Allison V-12 but there are no photos or drawings of the...
THE ANSWER!!!
The blooper is that the drawing and the caption DO NOT MATCH.
The caption says that this is a drawing of a single-stage, two-speed supercharger for a Merlin XX
In fact, the drawing is of a single-stage, one-speed supercharger for a [B]Merlin Mk II or III
The Merlin...