High altitude Lancaster

[jcf]

The real Avro Type 684, it had a fifth Merlin behind the fuselage scoop. Used for pressurization and turbo-charging the other four engines.

The fifth Merlin (sounds like the title of a bad fantasy novel) was to be mounted above
the wing, behind the flight deck driving a Rolls-Royce two-stage mechanical supercharger
(it was not a turbosupercharger) mounted behind the rear spar that would feed all five
engines. The ducting from the scoop ran in front of the bombay up to the supercharger.

[PR19_Kit]

An clever idea that. Did they ever trial such an installation on anything?

It'd make a good, and interesting model...............

[kitnut617]

Yah, I meant super-charging

[kitnut617]

It'd make a good, and interesting model...............

Remember I was after some Canberra fuselages a while ago  -----

[PR19_Kit]

It'd make a good, and interesting model...............

Remember I was after some Canberra fuselages a while ago  -----

[kitnut617]

It'd make a good, and interesting model...............

Remember I was after some Canberra fuselages a while ago  -----

I've found out that I have six Canberra kits and/or conversions in my stash, after spending a week or more, un-scrambling my Excel SS of my stash collection, plus adding all the recent additions to it. I've got two Aeroclub conversions which are one with a full fuselage and another which is the front end of a fuselage, just what I need for my 'operational' Type 684

[The Wooksta!]

An clever idea that. Did they ever trial such an installation on anything?

It'd make a good, and interesting model...............

We didn't but the Germans did with the Hs 130E and the Do 217P, but their system was never very reliable and the hundred or so Hs 130s ordered were cancelled.

[zenrat]

An clever idea that. Did they ever trial such an installation on anything?

It'd make a good, and interesting model...............

We didn't but the Germans did with the Hs 130E and the Do 217P, but their system was never very reliable and the hundred or so Hs 130s ordered were cancelled.

The prototype Petlyakov Pe 8 had "space for a fifth engine, an auxiliary Klimov M-100... reserved inside the fuselage, in a fairing above the wing spars and behind the pilots. It was intended to drive a supercharger that supplied pressurized air to the Mikulin AM-34FRN engines, with the installation designated ATsN-2 (Russian: Agregat tsentral'novo nadduva—Central Supercharging Unit), an idea pioneered in 1918 by the Zeppelin-Staaken firm in the German Empire, and refined further for the Third Reich Luftwaffe's Do 217P and Hs 130E experimental bomber designs. Subsequent models of the Pe-8 omitted the internal engine, and provided seating for a flight engineer and radio operator."
https://en.wikipedia.org/wiki/Petlyakov_Pe-8

[PR19_Kit]

Hmm, so even though it had a FIFTH engine, it didn't need a flight engineer for the earlier, supercharged version?

That sounds a bit  'backwards logic' to me'...... 

[bluedonkey99]

I like that wimpy configurations, and the avro 684 with that vulcan style canopy.

I've also had ideas on the more streamlined B-29 "ish" rendition



taken from: Page: 41

Lancaster - The Story of A Famous Bomber

Author : Bruce Robertson

A Harlyford Publication, 1977

ISBN:0 900435 10 0

This is a great book regarding all marks and types of Lancaster's, highly recommended reference. It also  has many B&W Pictures and a series of half-tone illustrations in 1/144 (Although sadly the Lancaster High Speed Mail Plane is not one of them! )

[kitnut617]

My plan is something along the lines of the Wellington Mk.V/VI. I've got a conversion to do one of those and I measured it up, the Wimpy's fuselage is 5'-6" wide by 8'-6" deep, but the pressure chamber is 5'-0" diameter, very cramped indeed and I can't imaging being in it for any length of time.
The Lancaster's fuselage is 6'-0" wide but I'm thinking the pressure chamber could be a bit wider, say 7'-0" diameter. This is where my plan is to use a Canberra fuselage as a pressure chamber, it's fuselage is 7'-0" diameter. But still a bit cramped I'd say for a long duration operation (a B-29 fuselage is 9'-0" diameter) --- So I'm thinking two pressure chambers, one above the other --- a "double bubble" but using the cabin floor/top of bomb bay as a divider between the two bubbles (up to a point anyway)--- All the crew would be in the bubbles, the defensive armament would all be remote control (and I'm working on something a little different for these [to be reveal much later])

Like this:

[jcf]

Pressurization is why the Curtiss CW-20(C-46) had the double-bubble fuselage.

[kitnut617]

Only none of them were ever pressurized,   were they Jon ----

[jcf]

Only none of them were ever pressurized,   were they Jon ----

So?

It was part of the original design of the CW-20, which was designed to compete with the pressurized
ailiners from Boeing and Douglas, but it was not considered a necessary feature on the military model.
While Curtiss never developed a pressurization system the original CW-20 was designed, and stressed,
to be pressurized.