Viability of tossing CBUs?
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For dive bombing, yes, that is the burst altitude I tend to use for one pair of CBU-87s.
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For dive bombing, yes, that is the burst altitude I tend to use for one pair of CBU-87s.
I haven’t done much (any?) High Altitude Dive Bombing. I’ll give it a shot. Thanks.
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why don’t try it and tell us what happen?
It’s a bit gammy. BA settings are built into the bomb. irl, the BA in the SMS is for FCC calculation and the pilot can’t change the BA on the fuse. The CBU-97SFW can be released a 200ft and rocket motor will thrust it to BA.
I tried lofting over mountains in F4AF. The issue I had was when the CBU was released below BA. The code was porked and the CBU would burst as the bomb when up thru BA and not on the way down.
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…. It’s a bit gammy. BA settings are built into the bomb. irl, the BA in the SMS is for FCC calculation and the pilot can’t change the BA on the fuse. …
I had read some posts on this not too long ago. In RL, can the BA be set to various altitudes prior to take-off? What I mean is, can a pilot direct the crew to set BA at, say 2000 feet …. then, maybe the next mission with the same weapon, direct the crew to set the BA at, say, 1200 feet?
Assuming the BA is ‘user selectable’ (pre-set before flight), what is a real-world useful range for BA … min to max?
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r/l max is max. At some altitude the footprint doesn’t get any bigger. Just gives the wind more effect on the bomblets.
Max would be for personal and light vehicles. Min would be for armor were the bomblet/s would have to contact the tank.
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don’t release just one as you will lose significant control of the a/c…pairs yes!
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FZU-39 on SUU-64A is A-K (I skipped) 300, 500, 700, 900, 1200, 1500, 1800, 2200, 2600, 3000’. It’s set before hand, probably with a screw slot or thumb wheel (something physical).
For target application you’d consult the JMEM but the critical factor is bomblet density. Eddie said that soft target is 5-7 per 1000 sq ft and hard target 10 (roughly). Considering 202 BLU-97A per can it takes 2-4 cans to reach such high densities for even a small(ish) area. Page ate my earlier math but if you do the calcs 808 bomblets (4 cans) could theoretically do high density for 80,000 sq ft or a 320’ diameter circle (surprisingly close to 100m diameter). That’s tiny compared to what the dispensed area is capable of at max RPM and HOF. The 476th vFG table shows the limits being 40x40’ at RPM-0 HOF-300 to a massive 4100x3500’ at RPM-2500 HOF-3000.
I don’t know what RPM BMS aims to simulate but unless you’re a B-52 carrying more cans than a supermarket, you’re going to be releasing 2-4 with max overlap at HOF no more than 1,000’… in the anti-armor mission.
One thing you have to be careful of in BMS is that if you loft CBUs with proximity release you must release above the HOF plane. If you release below the HOF plane the canisters will dud (unrealistic). Otherwise there is no limitation on lofting. IRL you want to make sure to deconfict the weapon with any terrain, jets, Santa Claus, etc. after the ~2-3s AD time but before arriving above the target. Also the radio prox senses in a wide “bubble” which triggers based on proximity and not slant range which might affect your footprint.
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r/l max is max. At some altitude the footprint doesn’t get any bigger. Just gives the wind more effect on the bomblets.
Max would be for personal and light vehicles. Min would be for armor were the bomblet/s would have to contact the tank.
Sorry, I meant what is: what is a general min BA setting in feet and what is general max BA setting in feet? . I think that’s what Frederf posted here:
FZU-39 on SUU-64A is A-K (I skipped) 300, 500, 700, 900, 1200, 1500, 1800, 2200, 2600, 3000’. It’s set before hand, probably with a screw slot or thumb wheel (something physical). ….
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Sorry, I meant what is: what is a general min BA setting in feet and what is general max BA setting in feet? . I think that’s what Frederf posted here:
It would have to do with the CBU design. Different CBU use different BA settings. There are docs for different types of CBUs and target types.
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Don’t post them unless they can be found in quantity in the public domain!
-Babite -
According an UXO-CBU study the CEM spreads over an area “120x200’ to 400x800’ .” Obviously the CEM is capable of footprints larger and smaller than this so perhaps this gives a hint as to footprints used operationally. Another hint is a “required 60’ overlap” in patterns which also suggests footprints of that size order. One can work backward from footprint tables to discover what settings to make.
In the end this is a BMS weapon in a BMS environment with BMS results. Only testing is going to provide meaningful feedback as to what densities are required for acceptably high Pk against various targets.