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Go Back   Armchair General and HistoryNet >> The Best Forums in History > Historical Events & Eras > World War II > Armor in World War II

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Armor in World War II Discuss all aspects & disciplines of World War II Armor here.

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  #31  
Old 27 Jan 17, 19:19
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Quote:
Originally Posted by Bluenose View Post
Yes, that is true. The sabot is basically there to provide a barrel-hugging, over-sized charge to the dart and once clear of the barrel it become unnecessary weight and drag.
No a large relatively light weight projectile suffers more from loss of
velocity due to air resistance than a smaller relatively heavy missile. Its nothing to do with necessary weight - indeed the effect would be more pronounced if the sabot had no weight at all.
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  #32  
Old 27 Jan 17, 19:45
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Quote:
No a large relatively light weight projectile suffers more from loss of
velocity due to air resistance than a smaller relatively heavy missile. Its nothing to do with necessary weight - indeed the effect would be more pronounced if the sabot had no weight at all.
Note particularly my use of the term 'UNnecessary weight' of the sabot - ie why it is discarded.

- The sabot element is there to accelerate the dart, yes?
- The sabot detaches after leaving the barrel, yes?
- Had the sabot remained surrounding the dart, it would have offered air resistance and decelerated the dart, yes?
- The weight of the sabot - that we both agree detaches before the dart begins its actual mission - though nominally adding to the total mass of the object, is actually irrelevant to the dart as it will add almost nothing to the overall energy involved in the penetration of armour, yes?
- Meanwhile, should the sabot remain attached, it would offer significant air resistance, yes?
- The weight of the dart (and sabot, if such a thing to occur), would increase its propensity to drop (complex calculations about weight vs resistance aside), thus further complicating the targeting solution at anything beyond short-to-medium range
- So, the air resistance of the sabot, given its low weight / energy addition to the dart, is UNnecessary impediment to the dart, hence UNnecessary weight and drag, yes?

Would you prefer if I said less-optimal density of the sabot combined with drag for the overall dart energy? It is pretty irrelevant as anyone who understands these things would have completely comprehended what I was saying.
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Last edited by Bluenose; 27 Jan 17 at 20:46..
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  #33  
Old 05 Feb 17, 05:38
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Quote:
Originally Posted by Bluenose View Post
Note particularly my use of the term 'UNnecessary weight' of the sabot - ie why it is discarded.

- The sabot element is there to accelerate the dart, yes?
- The sabot detaches after leaving the barrel, yes?
- Had the sabot remained surrounding the dart, it would have offered air resistance and decelerated the dart, yes?
- The weight of the sabot - that we both agree detaches before the dart begins its actual mission - though nominally adding to the total mass of the object, is actually irrelevant to the dart as it will add almost nothing to the overall energy involved in the penetration of armour, yes?
- Meanwhile, should the sabot remain attached, it would offer significant air resistance, yes?
- The weight of the dart (and sabot, if such a thing to occur), would increase its propensity to drop (complex calculations about weight vs resistance aside), thus further complicating the targeting solution at anything beyond short-to-medium range (underlining by broderickwells)
- So, the air resistance of the sabot, given its low weight / energy addition to the dart, is UNnecessary impediment to the dart, hence UNnecessary weight and drag, yes?

Would you prefer if I said less-optimal density of the sabot combined with drag for the overall dart energy? It is pretty irrelevant as anyone who understands these things would have completely comprehended what I was saying.
The drop is entirely due to gravity and is a constant, although with increased air drag, the average velocity will decline faster, flight times will be longer and drop will be greater at any given distance.

Ah, high school physics.
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  #34  
Old 05 Feb 17, 11:01
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I would say it becomes unnecessary drag but then you would kinda prefer the dart to have as much mass as possible - or rather as much of kinetic energy as possible. It is not 'unnecessary mass' but rather mass that unfortunately has to be discarded.
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