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PostPosted: Tue Jul 07, 2009 7:11 am 
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Retitled from: Crater size for 60mm mortar.

Does anyone now what size diameter hole a 60mm mortar would make?

This would be a normal HE round falling on a field that is made of clay based earth.

Any ideas?

Paul

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Last edited by Tailspin on Tue Jul 07, 2009 14:05 pm, edited 1 time in total.

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PostPosted: Tue Jul 07, 2009 8:28 am 
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60mm Mortars are not designed to make craters….

He explosive weight about 1.5kg ... just a big grenade...

The blast goes upwards and outwards not down into the ground…

It is designed to take out (kill) men and as such uses blast/shrapnel etc…

Only a minimal blast scar would be left on the ground…

I have seen plenty of photos of current mortar strikes… not much of a ground scar left

Now if you want craters you’ll need some 25pdrs etc….


Well that's my limited understanding.....

Corrections welcome

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PostPosted: Tue Jul 07, 2009 8:48 am 
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LAH 650 wrote:
60mm Mortars are not designed to make craters….

He explosive weight about 1.5kg ... just a big grenade...

The blast goes upwards and outwards not down into the ground…

It is designed to take out (kill) men and as such uses blast/shrapnel etc…

Only a minimal blast scar would be left on the ground…

I have seen plenty of photos of current mortar strikes… not much of a ground scar left

Now if you want craters you’ll need some 25pdrs etc….


Well that's my limited understanding.....

Corrections welcome


You know more than me. ;)

Thanks for the info. I'm looking to simulate a mortar hit on a reinforced foxhole at W&P. I have a few ripped sand bags so I thought I could have the shell "fall" to the side of the hole and will have made a mess of the sand bags and thrown the earth a little way.

Paul

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PostPosted: Tue Jul 07, 2009 11:54 am 
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a bit more.........

Quote:
Up on a hill, this team found ten small craters of 50cm diameter and the angle of impact indicated that these were caused by 50mm or 60 mm high explosive anti-personnel mortar bombs, fired from the ………

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PostPosted: Tue Jul 07, 2009 14:09 pm 
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Thanks again. I'm trying to figure out what the best way to dig a shallow crater.

A mate of mine served in the Royal Artillery so they should know what it will look like.

Paul

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PostPosted: Sun Aug 08, 2010 19:01 pm 
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Real Name: Tim
Group: Summer of 44 LHG, 1st Airlanding Light Regt RA
I have a British Army pamphlet entitled "Mortar Location by examination of Bomb Craters" Dated 1944... this deals specifically with the German 81mm and 120mm Mortars and advises that "The shape of a mortar bomb crater is determined by the direction of flight and the angle of descent of the bomb"... it also goes on to say that the "type of mortar firing can be determined from the tail fin which will usually be found in the crater".

Notes on the appearance of a crater are:

1) The edge farthest from the mortar has turf undercut while that nearest is shorn of growth and very much serrated by splinter grooves.
2) When fresh the crater is covered with loose earth which when cleared discloses the firm inner crater. This shows signs of burning.
3) At the bottom of the inner crater and in front of the point of detonation is the point at which the fins and fuze splinters bury themselves. In soft ground the fins and fuze splinters will bury themselves to a considerable depth along the line of the trajectory.
4) The ground around the crater is serrated by splinter grooves which form a definite pattern, the form of which depends on the angle of descent of the bomb in relation to the ground.

It will be clear that the smaller the angle of descent or the bomb in relation to the ground, the more indication of the direction of flight will be given. Clearly if the bomb drops at right angles to the ground the crater will be absolutely circular.

Since large angle of descent corresponds to small range it will be clear that the greater the range the more accurately can direction be obtained.

Equipment required:-

a) Map for map spotting crater position (1/25000, 1/50000 or 1 in scale)
b) Two straight sticks 2ft or 3ft long
c) A peg about 9ins long and of small section
d) Prismatic compass

The pamphlet then describes how you use the above to work out Direction and Angle of Descent.

Hope this helps for the next time (Beltring having now gone).

Tim

So I guess a similar approach can be taken when considering 60mm mortar bombs landing.

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