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Pictures of B-29 with Grand Slam


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#1 Wuzak

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Posted 26 July 2012 - 12:46 PM

I found some pictures of B-29 loaded up with a Grand Slam Bomb. The internal bomb bay shot is interesting.

Posted Image
B-29 with Grand Slam Taxis (600 DPI) by RyanCrierie, on Flickr


Posted Image
B-29 with Grand Slam is Towed (600 DPI) by RyanCrierie, on Flickr


Posted Image
B-29 with Grand Slam Internal Closeup (600 DPI) by RyanCrierie, on Flickr


Posted Image
B-29 with Grand Slam Exterior Closeup (600 DPI) by RyanCrierie, on Flickr

#2 oldbutnotwise

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Posted 26 July 2012 - 01:23 PM

When you see it on the B29 you got to wonder how they managed to drop it from Lancs, it looks huge even on the B29

#3 Flo

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Posted 26 July 2012 - 04:31 PM

Bomberguy reckons 41 dropped by war's end. Best ignoring the comments section...;)



#4 oldbutnotwise

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Posted 26 July 2012 - 05:59 PM

Posted Image

with two tallboys (note to walt - this is a B29 not a B17)

#5 Flo

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Posted 26 July 2012 - 07:32 PM

:eek: Wouldn't like to be on the receiving end of that lot...

#6 Edgar Brooks

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Posted 26 July 2012 - 09:24 PM

I can recommend "Barnes Wallis' Bombs," by Stephen Flower; it includes an entertaining item on the first dropping of the bomb. Publishers are Amberley, and the ISBN 978-1-84868-959-6.

#7 Wuzak

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Posted 26 July 2012 - 09:32 PM

Barens Wallis had intended the bombs to be dropped from higher altitudes (30,000ft+) than the Lancaster could carry it.

His calculations showed that the height the Lancs could drop the bombs from (22,000ft for Tallboy, <20,000ft - maybe as low as 18,000ft - for Hrand Slam) would still allow the bombs to achieve significant penetration, and thus maintain the blast effect that was desired.

Bomberguy mentions, in his preamble, that the height was a factor of inaccuracy. He didn't mention the biggest cause of inaccuracy - the bomb release mechanism.

For use on the Lancaster both Tallboy and Grand Slam were held in place by a chain wrapped around the bomb. To drop teh bomb the end of the chain would release. But this would often get momentarily hung up, so the bomb wouldn't necessarily be released on the bomb triigger command. And travelling at 200mph+ even fractions of seconds for the bomb not releasing would mean a great variation in position on the ground.

The B-29 could carry both bombs higher. The Tallboy system would appear to allow better release accuracy. And, of course, dropping two at the same time should ensure two hits very close together, possibly amplifying the effect. The pictures appear to show a chain system for release for Grand Slam so that probably has the same issues as the RAF system.

#8 Wuzak

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Posted 26 July 2012 - 10:07 PM

Bomberguy reckons 41 dropped by war's end. Best ignoring the comments section...;)


Flower has 40 Grand Slams aimed at target and 2 deliberately jettisoned.

Also, 879 Tallboys were used on active service. 835 aimed at target, 8 dropped accidentally, 7 carried by aircraft which were shot down before dropping the bomb, 29 jettisoned or abandoned after crash landing.

The 29 included 5 Tallboys abandoned at Yagodnik Russia.

#9 NeoConShooter

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Posted 26 July 2012 - 10:35 PM

I found some pictures of B-29 loaded up with a Grand Slam Bomb. The internal bomb bay shot is interesting.

Posted Image
B-29 with Grand Slam Taxis (600 DPI) by RyanCrierie, on Flickr


Posted Image
B-29 with Grand Slam is Towed (600 DPI) by RyanCrierie, on Flickr


Posted Image
B-29 with Grand Slam Internal Closeup (600 DPI) by RyanCrierie, on Flickr


Posted Image
B-29 with Grand Slam Exterior Closeup (600 DPI) by RyanCrierie, on Flickr

From Wiki;
The T-12 also known as Cloudmaker demolition bomb was developed by the United States from 1944 to 1948. It was designed to attack targets invulnerable to conventional "soft" bombs, such as bunkers and viaducts. It achieved this by having an extremely thick nose section, which was designed to penetrate deeply into hardened concrete structures and then detonate inside the target after a short time delay. This created an "earthquake effect".

The T-12 was a further development of the concept initiated with the United Kingdom's Tallboy and Grand Slam weapons: a hardened, highly aerodynamic bomb of the greatest possible weight designed to be dropped from the highest possible altitude. Penetrating deeply in the earth before exploding, the resulting shockwave was transmitted through the earth into structures. The resulting camouflet could also undermine structures. The bomb could also be used against hardened targets. The T-12 was not a simple scale up of the M110, but incorporated modifications based on testing and calculations.

Originally set to meet a 42,000 lb (19,000 kg) target weight (the maximum payload for the experimental Convair B-36 "Peacemaker" bomber), the original design with its hardened case was slightly less than 43,000. The final T-12 weighed 43,600 lb (nearly 20 metric tons). This was twice the size of the United States' previous largest bomb, the Bomb, GP, 22,000-lb, M110 (T-14), the American-built version of the British Grand Slam. The B-36 was redesigned so it could carry the T12, although a converted B-29 Superfortress was used for testing.

Weapons of comparable size to the T-12, such as the BLU-82 and GBU-43/B Massive Ordnance Air Blast bombs, were developed as latter-day US superbombs, but their utility is limited outside the realm of psychological weapons and demolition. Only the GBU-43/B remains in the inventory. They are not hardened and lack the hard target capability of the T-12 and its cousins. The Massive Ordnance Penetrator has been recently developed in light of unsatisfactory penetration by existing 2000lb and 5000lb class weapons.

http://en.wikipedia....12-USORDMUS.JPG
http://en.wikipedia....T-12_Cloudmaker

http://books.google....nepage&q&f=true

http://www.airpower....-apr/coker.html

#10 NeoConShooter

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Posted 26 July 2012 - 10:45 PM

Posted Image

with two tallboys (note to walt - this is a B29 not a B17)


They are not "Tall Boys", but Grand Slams! See this article, it used to have pictures, but they have some how been lost as the hosting web site changed over the years.
http://www.airpower....-apr/coker.html

The B-36 was test-flown for the first time in August 1946. Even then the first models of the B-36 could not carry the big bomb, and it would be some months before they could be modified to handle it. The Air Force, which was interested in experimenting with the 44,000-lb bomb, decided that a modified B-29 could handle the job until a B-36 was available.:eek:

Toward the end of the war a B-29 had been converted to carry two 22,000-lb bombs, one under each wing, for use against Japan. The two atomic bombs, the Fat Man and Little Boy, made use of this special B-29 unnecessary.13:eek:

The aircraft chosen for the alterations was a B-29A, No. 44-62263. The Wichita, Kansas, Division of the Boeing Company performed the fuselage work. Part of the body section under the wings was cut away, the rear bomb-bay doors were removed entirely, and the front bomb-bay doors were cut away to allow the nose of the bomb to protrude. In spite of these modifications, about half the missile hung out beneath the plane. The aircraft also required special instrumentation to measure wing deflection, “G” forces exerted on the plane, and acceleration of the aircraft upon release of the bomb. A separate instrument panel with the necessary equipment was installed so that a special camera mounted near the panel could photograph the instruments. The wing tips were painted with black and yellow strips of known width which could be photographed and the wing deflection computed. The instrumentation work was accomplished at Muroc AFB.14:eek:




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