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Junkers Ju 188
par Lerick Mar 23 Mar 2010, 09:09
Evolution du Ju 88, le sujet Ju 188 est ici en anglais, la partie française semblant incluse dans le fil Ju 88
Sur Wikipedia :
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The [Vous devez être inscrit et connecté pour voir ce lien] Ju 188 was a [Vous devez être inscrit et connecté pour voir ce lien] [Vous devez être inscrit et connecté pour voir ce lien] high-performance [Vous devez être inscrit et connecté pour voir ce lien] built during [Vous devez être inscrit et connecté pour voir ce lien], the planned follow-on to the famed[Vous devez être inscrit et connecté pour voir ce lien] with better performance and payload.
It was produced only in limited numbers, due both to the presence of improved versions of the Ju 88,
as well as the deteriorating war condition and the resulting focus on [Vous devez être inscrit et connecté pour voir ce lien] production.
Sur Wikipedia :
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
The [Vous devez être inscrit et connecté pour voir ce lien] Ju 188 was a [Vous devez être inscrit et connecté pour voir ce lien] [Vous devez être inscrit et connecté pour voir ce lien] high-performance [Vous devez être inscrit et connecté pour voir ce lien] built during [Vous devez être inscrit et connecté pour voir ce lien], the planned follow-on to the famed[Vous devez être inscrit et connecté pour voir ce lien] with better performance and payload.
It was produced only in limited numbers, due both to the presence of improved versions of the Ju 88,
as well as the deteriorating war condition and the resulting focus on [Vous devez être inscrit et connecté pour voir ce lien] production.
Lerick- CLUB
- Messages : 389
Re: Junkers Ju 188
par Lerick Mar 23 Mar 2010, 09:12
Background
In 1936, Junkers submitted proposals for the [Vous devez être inscrit et connecté pour voir ce lien] and [Vous devez être inscrit et connecté pour voir ce lien] into competition for the new standardized Luftwaffe high-speed [Vous devez être inscrit et connecté pour voir ce lien], known as the [Vous devez être inscrit et connecté pour voir ce lien] (fast [Vous devez être inscrit et connecté pour voir ce lien]).
In 1936, Junkers submitted proposals for the [Vous devez être inscrit et connecté pour voir ce lien] and [Vous devez être inscrit et connecté pour voir ce lien] into competition for the new standardized Luftwaffe high-speed [Vous devez être inscrit et connecté pour voir ce lien], known as the [Vous devez être inscrit et connecté pour voir ce lien] (fast [Vous devez être inscrit et connecté pour voir ce lien]).
Lerick- CLUB
- Messages : 389
Re: Junkers Ju 188
par Lerick Mar 23 Mar 2010, 09:17
The two designs were almost identical, differing only in that the Ju 85 used a twin-[Vous devez être inscrit et connecté pour voir ce lien] and the Ju 88 a single [Vous devez être inscrit et connecté pour voir ce lien].
At the same time, they offered modified versions of each as the Ju 85B and Ju 88B,
again similar to the original designs, but using an "egg shaped" forward [Vous devez être inscrit et connecté pour voir ce lien] that was essentially one large window, another example of the "bullet-nose" design philosophy that almost all new German bomber designs exhibited from the time of the [Vous devez être inscrit et connecté pour voir ce lien] onwards.
At the same time, they offered modified versions of each as the Ju 85B and Ju 88B,
again similar to the original designs, but using an "egg shaped" forward [Vous devez être inscrit et connecté pour voir ce lien] that was essentially one large window, another example of the "bullet-nose" design philosophy that almost all new German bomber designs exhibited from the time of the [Vous devez être inscrit et connecté pour voir ce lien] onwards.
Lerick- CLUB
- Messages : 389
Re: Junkers Ju 188
par Lerick Mar 23 Mar 2010, 09:18
The new design offered somewhat lower [Vous devez être inscrit et connecté pour voir ce lien], and better visibility.
At the time, this was considered too radical, and eventually the Ju 88A with its simpler fighter-like "stepped" [Vous devez être inscrit et connecté pour voir ce lien] won the contest.
At the time, this was considered too radical, and eventually the Ju 88A with its simpler fighter-like "stepped" [Vous devez être inscrit et connecté pour voir ce lien] won the contest.
Lerick- CLUB
- Messages : 389
Re: Junkers Ju 188
par Lerick Mar 23 Mar 2010, 09:19
By 1939, the original Ju 88 had itself evolved with considerably more window area, but in a fashion that was not well streamlined.
The [Vous devez être inscrit et connecté pour voir ce lien] (RLM) was in the process of ordering a "second generation" bomber in a project known as "[Vous devez être inscrit et connecté pour voir ce lien]", but this was extensively delayed due to the non-delivery of the large 2,500 PS (1,840 kW, 2,470 hp)-class engines, like Junkers' own [Vous devez être inscrit et connecté pour voir ce lien], that the designs would rely on.
Although Junkers' own [Vous devez être inscrit et connecté pour voir ce lien] was currently leading the contest, there was no delivery date on the engines and the Ju 88B project was re-submitted as a stop-gap measure.
The [Vous devez être inscrit et connecté pour voir ce lien] (RLM) was in the process of ordering a "second generation" bomber in a project known as "[Vous devez être inscrit et connecté pour voir ce lien]", but this was extensively delayed due to the non-delivery of the large 2,500 PS (1,840 kW, 2,470 hp)-class engines, like Junkers' own [Vous devez être inscrit et connecté pour voir ce lien], that the designs would rely on.
Although Junkers' own [Vous devez être inscrit et connecté pour voir ce lien] was currently leading the contest, there was no delivery date on the engines and the Ju 88B project was re-submitted as a stop-gap measure.
Lerick- CLUB
- Messages : 389
Re: Junkers Ju 188
par Lerick Mar 23 Mar 2010, 09:22
For this version, they used the latest Ju 88 A-1 [Vous devez être inscrit et connecté pour voir ce lien] as a baseline, but added the new [Vous devez être inscrit et connecté pour voir ce lien] engine, which had recently started bench testing and was expected to deliver 1,500 PS (1,100 kW, 1,480 hp).
The Reichsluftfahrtministerium (RLM - Air Ministry) also stipulated that the aircraft should be able to accept the [Vous devez être inscrit et connecté pour voir ce lien] without alterations made to the engine "housing" ([Vous devez être inscrit et connecté pour voir ce lien]).
The Reichsluftfahrtministerium (RLM - Air Ministry) also stipulated that the aircraft should be able to accept the [Vous devez être inscrit et connecté pour voir ce lien] without alterations made to the engine "housing" ([Vous devez être inscrit et connecté pour voir ce lien]).
Lerick- CLUB
- Messages : 389
Re: Junkers Ju 188
par Lerick Mar 23 Mar 2010, 09:28
The RLM was not impressed with the new design, as it offered only small improvements over the existing Ju 88A's then in service.
However they did suggest that Junkers continue with the prototype work anyway, but asked that they consider fitting the design with the[Vous devez être inscrit et connecté pour voir ce lien] radial instead.
This engine was cancelled only a few weeks later, and all designs based on it moved to the newer and more powerful BMW 801.
However they did suggest that Junkers continue with the prototype work anyway, but asked that they consider fitting the design with the[Vous devez être inscrit et connecté pour voir ce lien] radial instead.
This engine was cancelled only a few weeks later, and all designs based on it moved to the newer and more powerful BMW 801.
Lerick- CLUB
- Messages : 389
Re: Junkers Ju 188
par Lerick Mar 23 Mar 2010, 09:30
Prototypes, Ju 88 B-0
The prototype Ju 88B V1, D-AUVS, flew for the first time with the 801A/B engines in early 1940.
The fuselage was identical to the Ju 88 A-1, which presented a problem:
with the extra power, 1,560 PS (1,150 kW, 1,540 hp), the design could now carry considerably more load than the small [Vous devez être inscrit et connecté pour voir ce lien] could fit.
An additional external shackle was then added to each wing well outside the engines, although using the rack would
seriously hamper performance.
The prototype Ju 88B V1, D-AUVS, flew for the first time with the 801A/B engines in early 1940.
The fuselage was identical to the Ju 88 A-1, which presented a problem:
with the extra power, 1,560 PS (1,150 kW, 1,540 hp), the design could now carry considerably more load than the small [Vous devez être inscrit et connecté pour voir ce lien] could fit.
An additional external shackle was then added to each wing well outside the engines, although using the rack would
seriously hamper performance.
Lerick- CLUB
- Messages : 389
Re: Junkers Ju 188
par Lerick Mar 23 Mar 2010, 09:31
During the summer, a pre-production run of 10 Ju 88 B-0 based on the pre-production Ju 88 A-4 airframes were delivered.
The A-4 used a longer wing for better altitude performance, just over 20 m (70 ft) as opposed to the 18 m (60 ft)
span of the earlier A-series, but attention to streamlining and new "pointy" [Vous devez être inscrit et connecté pour voir ce lien] kept drag to about what it was
earlier.
The airframe changes moved the [Vous devez être inscrit et connecté pour voir ce lien] slightly, so the glazed "[Vous devez être inscrit et connecté pour voir ce lien]" area was made slightly longer to
re-balance the aircraft, while also offering better visibility for other members of the crew.
The A-4 used a longer wing for better altitude performance, just over 20 m (70 ft) as opposed to the 18 m (60 ft)
span of the earlier A-series, but attention to streamlining and new "pointy" [Vous devez être inscrit et connecté pour voir ce lien] kept drag to about what it was
earlier.
The airframe changes moved the [Vous devez être inscrit et connecté pour voir ce lien] slightly, so the glazed "[Vous devez être inscrit et connecté pour voir ce lien]" area was made slightly longer to
re-balance the aircraft, while also offering better visibility for other members of the crew.
Lerick- CLUB
- Messages : 389
Re: Junkers Ju 188
par Lerick Mar 23 Mar 2010, 10:01
Service tests were all successful, and the pilots generally lauded the new cockpit design.
However, the RLM still remained unconvinced that the small improvement in performance over the existing A-5's and future A-4's was worth investing time in.
Instead, the pre-production models were modified as long-range [Vous devez être inscrit et connecté pour voir ce lien] aircraft by removing the guns, [Vous devez être inscrit et connecté pour voir ce lien] and external bomb shackles, and fitting [Vous devez être inscrit et connecté pour voir ce lien] into the bomb bay.
However, the RLM still remained unconvinced that the small improvement in performance over the existing A-5's and future A-4's was worth investing time in.
Instead, the pre-production models were modified as long-range [Vous devez être inscrit et connecté pour voir ce lien] aircraft by removing the guns, [Vous devez être inscrit et connecté pour voir ce lien] and external bomb shackles, and fitting [Vous devez être inscrit et connecté pour voir ce lien] into the bomb bay.
Lerick- CLUB
- Messages : 389
Re: Junkers Ju 188
par Lerick Mar 23 Mar 2010, 10:01
Several of the airframes were retained by Junkers for further development.
One of these was fitted with the slightly updated 801L engines and a small power-operated [Vous devez être inscrit et connecté pour voir ce lien] on the extreme top of the cockpit mounting a 13 mm (.51 in) [Vous devez être inscrit et connecté pour voir ce lien].
One of these was fitted with the slightly updated 801L engines and a small power-operated [Vous devez être inscrit et connecté pour voir ce lien] on the extreme top of the cockpit mounting a 13 mm (.51 in) [Vous devez être inscrit et connecté pour voir ce lien].
Lerick- CLUB
- Messages : 389
Re: Junkers Ju 188
par Lerick Mar 23 Mar 2010, 10:07
Ju 188
By 1942, it was becoming clear that the Ju 288 was not going to be ready any time soon, and at the same time the
Ju 88's were increasingly at the mercy of a rapidly-improving RAF and [Vous devez être inscrit et connecté pour voir ce lien].
The RLM finally decided that even the small gains in performance in the Ju 88B were worth considering, and asked Junkers for a series of upgrades as the Ju 188.
By 1942, it was becoming clear that the Ju 288 was not going to be ready any time soon, and at the same time the
Ju 88's were increasingly at the mercy of a rapidly-improving RAF and [Vous devez être inscrit et connecté pour voir ce lien].
The RLM finally decided that even the small gains in performance in the Ju 88B were worth considering, and asked Junkers for a series of upgrades as the Ju 188.
Lerick- CLUB
- Messages : 389
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