CBU burst altitude set inflight
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I read that although it seems to be an option to be configurated inflight, the bombs fuzes delay is not really set that way and its purpose is only to match what have being previously set on ground, and reflect it in the correspondant MFD page.-
What happens with the CBUs burst altitude inflight configuration option ? does it works the same way?
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In RL or in BMS?
In BMS the ‘Arming Delay’ is 100% active on the SMS page and 100% not active in the loadout screen. I.e., it is set on the SMS page. Same as you, I’ve read that it’s done differently in RL.
In BMS burst altitude is 100% selectable on the SMS page at any time before release. In RL ….
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…and don’t confuse AD with burst height - one is delay until function, the other is…well…er…burst height.
Stevie
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I meant in RL, as in BMS, both AD and BA can be set at the SMS page.- AD definitely is not real, my doubt is about BA
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Both are set on the nose of the CBU generally speaking. There might be differences depending on the fuzing and the specific CBU.
Here at 1:26 you can see the pilot checking the settings.
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Still no replies about how burst altitude is managed in Real Life
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You know, aside from the post inmediately above yours. Both AD and BA are generally set on the fuze, on the nose of the munition.
For BMS though, until we get a realistic SMS implementation, we get to set AD and BA.
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You know, aside from the post inmediately above yours. Both AD and BA are generally set on the fuze, on the nose of the munition.
For BMS though, until we get a realistic SMS implementation, we get to set AD and BA.
OK, now it is clear to me, thanks.
The second question, is if in Real Life, is there also a SMS page related to those settings, and which is its purpose -
the SMS page in question looks like the BMS version of that page.
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To be more exact it’s not the SMS in BMS which is preventing the concept of “set weapon on ground, tell jet whatever” but armament options distinct from SMS. Like setting the LGB codes on the armament screen, it would be done externally. Then you’d show up to the jet and enter whatever SMS information you wanted and if that did or did not correspond to what the bomb really is would be your responsibility. The only change to the current SMS would be to inhibit it from changing reality.
The only SMS function really missing from BMS is being able to edit the INV page but you don’t enter stuff like AD/HOF on it in real life anyways. You tell the system that there are 3 MK82s on a TER on a MAU on station 7 and that’s as detailed as it gets. INV editing is not a necessary ability to separate the fuze reality and fuze entered details. The AD/HOF info is entered on the AG CTRL page like we get now with categories 1, 2, 3, 4.
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And just for information some fuzes can be set from cockpit IRL.
JPF for JDAM is an example. It allows to set both arming delay and explosion delay from cockpit. Unfortunately there is no JPF in BMS. -
And just for information some fuzes can be set from cockpit IRL.
JPF for JDAM is an example. It allows to set both arming delay and explosion delay from cockpit. Unfortunately there is no JPF in BMS.What is JPF ?
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[emoji23] [emoji23] [emoji23]
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Oh sorry, let me google it for you instead.
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…beat y’all to it.
Stevie
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http://navyaviation.tpub.com/14023/css/Mk-339-Mods-0-And-1-Mechanical-Time-Fuze-53.htm
If the MK 339 Mod 1 fuze is used and only the primary fuze arming wire is pulled, the fuze will function 1.2 seconds after the arming wire has been extracted. If the pilot selects the option time (4.0 seconds), both the primary and option arming wires must be pulled. If the pilot selects the option time and the primary arming wire is not pulled, the fuze will be a dud.
So there is no “true” function time selection from cockpit.
You can only chose between 2 pre defined times.
A little smililar to normal dumb bombs that have 2 (nose and tail) fuzes and you can choose between them from cockpit. -
Above is right. This is just an expansion on the topic.
Those are the category-4 on the SMS CTRL page. They are an extension of the concept of category-3 weapons. For category 1 and 2 weapons you enter in an AD which corresponds to a time for which X% of weapons will arm less than this time. For example if the fuze setting is 6 seconds research might show that 99% of them explode within ±1.5 seconds. So you type in 7.5 seconds into SMS to get cue information to ensure you drop with 7.5 seconds TOF which means that nearly all of your bombs will arm in time. They will arm sooner on average but that’You want cueing that includes most fuzes arming within this time.
Category 3 and 4 weapons are different. When the CBU fuze time elapses it will dispense. In this case you want to type in the average real fuze activation time. This will produce HUD cues to deliver such that the bomb is at the desired height at the indicated time since release. You don’t want to be conservative, you want to be accurate. Being too early or late are equally bad. Time-based CBU fuzes are not perfect and may dispense before or after the required time. Since the variation cannot be predicted the entered values should match the expected (average) value. During a C3/C4 delivery you put the PUAC on the target such that the CBU’s time fuzes at the desired HOF.
Category 4 weapons have two timers. Which timer is active depends on which fuze solenoids are enabled. The pilot has no control over what these two timers’ values are. He can only report their state accurately to the SMS. The choice between which of the two timers is used is determined by the solenoid selection setting (nose/tail/nstl).
C1 - ADs for nose and tail fuzes. Enter numbers (in real life) which are conservative to include bomb’s set time + possible variance.
Unitary bombs
C2 - ADs for CBU fuze entered (in real life) which are conservative; HOF to match what radio proximity fuze setting is
CBUs with radio-proximity splitting
C3 - AD timer for dispenser splitting as accurately as possible; HOF the height you want the CBU to be at one AD time after release
CBUs with time-based splitting
C4 - AD timers for dispenser splitting as accurately as possible; HOF the height you want the CBU to be at one AD time after release
CBUs with two options for time-based splitting
