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Thread: Grand Slam bomb

  1. #1
    I do bad things to bad people Dispatcher's Avatar
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    Wow. Thats some story.

    A live gate-guard....

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    Banned user Martial's Avatar
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    D'oh! Very strange story, indeed.

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    Senior Member nemowork's Avatar
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    Surely somebody must have wondered why it was so heavy when they loaded it up? Or if the guys loading the bomb didnt know where it was going, just another day of loading bombs, and the guys moving the plane into position didnt know what was on it!

    that is one hell of a lack of communication.

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    no harm no foul. i'd get a replica made. thats some cool history for the town. you could tell tourists or passerby's the story and let them know its real. instill some awe as they carefully move by. act woefully ignorant as they gawk, get in their cars and haul ass.

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    Senior Member Eoin666's Avatar
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    Flatten Lincoln.......hmm, about 30 quid's worth of damage then

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    Member vulcanxm603's Avatar
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    If the bomb had gone off and flattened Lincoln cathedral the the RAF pilots at Waddington would not have a landmark to navigate by anymore.

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    the Ralph Wiggum of Mp.net. timetraveller's Avatar
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    Nice find Superbootie

    There was Another Bomb nearly the same weight that the Lanc also carried ..I remeber seeing a pic of it looked like a oversized Oil drum .. and designed by Sir Barnes Wallis .. I'll try find more info ..
    Last edited by timetraveller; 11-06-2007 at 04:18 PM. Reason: edit ..correction

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    Member Oneto15's Avatar
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    Quote Originally Posted by timetraveller View Post
    Nice find Superbootie

    There was Another Bomb nearly the same weight that the Lanc also carried ..I remeber seeing a pic of it looked like a oversized Oil drum .. I think it was called the Earthquake bomb and designed by Sir Barnes Wallis .. I'll try find more info ..
    The 'Grand Slam' & 'Earthquake' bombs were one and the same.

    The "over sized oil drum" to which you refer was code named 'Upkeep' (9200lb/4173kg total weight) containing 6600lb/2994kg of RDX high explosive and are more commonly known as "The Bouncing Bomb" made famous by RAF 617 Squadron in the attack against the Ruhr dams. Wallis also created a smaller version of 'Upkeep' known as 'Highball' which were spherical in shape and intended to be carried in tandem aboard RAF Mosquito aircraft. Each 'Highball' contained 600lb/272kg of Torpex high explosive.


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    Member vulcanxm603's Avatar
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    Quote Originally Posted by Oneto15 View Post
    The 'Grand Slam' & 'Earthquake' bombs were one and the same.

    The "over sized oil drum" to which you refer was code named "Upkeeep" (9200lb/4173kg total weight) containing 6600lb/2994kg of RDX high explosive and are more commonly known as "The Bouncing Bomb" made famous by RAF 617 Squadron in the attack against the Ruhr dams. Wallis also created a smaller version of 'Upkeep' known as 'Highball' which were spherical in shape and intended to be carried in tandem aboard RAF Mosquito aircraft. Each Highball contained 600lb/272kg of Torpex high explosive.

    there was also the Tallboy bomb. This was approx half the size of the Grand Slam.
    The only aircraft capable of carrying these was the Lancaster. Mind you they removed the upper turret and front turret so that the aircraft had a better range and ceiling. Once these aircraft had dropped their bomb they were the fastest Lancasters around. See attached pics.
    They are as follows:
    Top L - R: 12000lb Tallboy being hiosted, Tallboy in bomb bay (note doors were modified and the bomb held in place with a chain), Lancaster with a Grand Slam (Fuselage was modified and no bomb bay doors.

    Middle: L - R Grand slam carrying Lanc showing fuselage mod and no front/upper turrets, 2 Grand slam Lancs with a standard B.I Lanc.

    Bottom: There she goes - A test Grand slam after release at Ashley Walk bombing range, Hants.
    Attachments Pending Approval Attachments Pending Approval

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    Member vulcanxm603's Avatar
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    Default Bouncing bomb - Dambusters

    Quote Originally Posted by timetraveller View Post
    Nice find Superbootie

    There was Another Bomb nearly the same weight that the Lanc also carried ..I remeber seeing a pic of it looked like a oversized Oil drum .. and designed by Sir Barnes Wallis .. I'll try find more info ..
    There is one of these at he Barnes Wallis Hall in the Yorkshire Air Museum at Elvington, Yorkshire. Unfortunately they will not allow photos to be taken. There are also parts of the other bits and pieces he designed.

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    Senior Member wotsnext's Avatar
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    Quote Originally Posted by Eoin666 View Post
    Flatten Lincoln.......hmm, about 30 quid's worth of damage then
    Yam rekon?......Lincoln is a wonderfull city.
    Last edited by wotsnext; 11-06-2007 at 06:25 PM.

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    the Ralph Wiggum of Mp.net. timetraveller's Avatar
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    Quote Originally Posted by vulcanxm603 View Post
    There is one of these at he Barnes Wallis Hall in the Yorkshire Air Museum at Elvington, Yorkshire. Unfortunately they will not allow photos to be taken. There are also parts of the other bits and pieces he designed.

    Cheers

    What size would say it was ... ?

  13. #13
    Member vulcanxm603's Avatar
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    Quote Originally Posted by timetraveller View Post
    Cheers

    What size would say it was ... ?
    According to the information I got from the internet the size is as follows:
    [*******windowtext][/COLOR]
    [*******windowtext][FONT='Lucida Sans Unicode'][SIZE=3]The Bouncing Bomb[/SIZE][/FONT][/COLOR]


    [SIZE=3][FONT=Times New Roman]Upkeep was the codename for Barnes Wallis' revolutionary new weapon to bust the dams of the Ruhr Valley. It became more familiarly known as 'The Bouncing Bomb'. [*******white][/COLOR][/FONT][/SIZE]
    [CENTER][CENTER][FONT='Lucida Sans Unicode']Specification:[/FONT][/CENTER]
    [FONT='Lucida Sans Unicode']Height[/FONT]
    [FONT='Lucida Sans Unicode']1.42 meters (4 feet 8 inches) [/FONT]
    [FONT='Lucida Sans Unicode']Width[/FONT]

    [FONT='Lucida Sans Unicode']1.42 meters (4 feet 8 inches) [/FONT]
    [FONT='Lucida Sans Unicode']Length[/FONT]

    [FONT='Lucida Sans Unicode']1.52 meters (5 feet) [/FONT]
    [FONT='Lucida Sans Unicode']Weight[/FONT]

    [FONT='Lucida Sans Unicode']4195 Kg ( 4.195 tonnes / 9,250 pounds) [/FONT]
    [FONT='Lucida Sans Unicode']Weight (Explosives)[/FONT]

    [FONT='Lucida Sans Unicode']2993 Kg (2.99 tonnes / 6,600 pounds) [/FONT]
    [/CENTER]

    [*******white][/COLOR]
    Hope this helps.
    Last edited by vulcanxm603; 11-07-2007 at 05:13 AM.

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    Member Oneto15's Avatar
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    Tandem Highballs fitted in a Mossie's bomb bay.




    Recovered fragment of a prototype Highball bomb.


  15. #15
    Member vulcanxm603's Avatar
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    Default Grandslam, Tallboy & Upkeep bombs

    Here are some more pics of these bombs. They give some idea as to the sizes.

    They are as follows: Tallboy, Upkeep & Grandslam, Upkeep at Duxford museum, Crater from Tallboy bomb at ex Ashley Walk bombing range 60 years on.
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