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RE: question: what is the probability of weakpoint hit?

 
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RE: question: what is the probability of weakpoint hit? - 11/30/2018 4:23:44 PM   
gbem

 

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that would be true for all rocket motors... peak velocity =/= average velocity... it must be noted that a missile continuously accelerates towards the target unlike bullets or projectiles which actually decelerate towards the target...

question... isnt the average velocity of a TOW 187.5 m/s? 3750 max range and 20s time to target?

(in reply to Lieste)
Post #: 91
RE: question: what is the probability of weakpoint hit? - 11/30/2018 4:55:02 PM   
Lieste

 

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Tow2a 20s (some manuals say approx 21s), Tow2b 21s to 3750m

On acceleration:

Missiles have a short burn, some exhaust their motor in the launch tube and coast the whole way. Others are ejected, then boost and coast. TOW is ejected, motor ignites at 7-8m, burns only for 1.5 s, peak ~320-330m/s, coasts to max range over the next 19.5s
Very few are still accelerating at their maximum range, and then only if their range is limited by factors other than kinematics. Those which may still have an active motor, are almost always only using a low thrust arrangement as a sustainer/gas generator, to limit decay of energy, and the bulk of their acceleration still comes from the high thrust boost motor or boost phase of a multi-phase motor.

The velocity/range profile for most SAM/ATGM is broadly similar to a (draggy) shell, but with longer times of flight and an acceleration from a launch speed to peak over the first second(s).

e.g 9M119M launch ~200m/s, boost 800m/s within a very brief burn, then a long coast to their max range of 5000m at an "average" velocity (not actually flown for any duration) of ~350m/s

< Message edited by Lieste -- 11/30/2018 4:56:04 PM >

(in reply to gbem)
Post #: 92
RE: question: what is the probability of weakpoint hit? - 11/30/2018 5:06:16 PM   
gbem

 

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quote:

Missiles have a short burn, some exhaust their motor in the launch tube and coast the whole way. Others are ejected, then boost and coast. TOW is ejected, motor ignites at 7-8m, burns only for 1.5 s, peak ~320-330m/s, coasts to max range over the next 19.5s
Very few are still accelerating at their maximum range, and then only if their range is limited by factors other than kinematics. Those which may still have an active motor, are almost always only using a low thrust arrangement as a sustainer/gas generator, to limit decay of energy, and the bulk of their acceleration still comes from the high thrust boost motor or boost phase of a multi-phase motor.


afaik russian missiles like the R-77 vympel have a multiphase motor where they continuously accelerate towards their target in contrast to other missiles like the AIM-120 which only have a boost phase rocket motor...

i always thought the russians opted for multiphase while nato went for boost phase motors... ohh well.. never knew the refleks was a boost phase missile... err is it? or is it multiphase? tankograd does mention cruise velocity...

< Message edited by gbem -- 11/30/2018 5:31:09 PM >

(in reply to Lieste)
Post #: 93
RE: question: what is the probability of weakpoint hit? - 11/30/2018 10:40:46 PM   
kevinkins


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Joined: 3/8/2006
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Gee .. I can't wait to play you in multiplayer / PBEM.

_____________________________

“The study of history lies at the foundation of all sound military conclusions and practice.”
― Alfred Thayer Mahan


(in reply to gbem)
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