555 Posted August 2, 2023 Share Posted August 2, 2023 When programming in burst height of the CBU97, the manual says "BURST HEIGHT: determines the altitude (in feet MSL) at which the bomblets will be released" (page 496). I'm not sure that this makes sense to me - the highest value that can be set is "K" or 3000 feet. What if you wanted to drop these on a target at say 4000 ft MSL? Surely this setting should be AGL? 1 Link to comment Share on other sites More sharing options...
LordOrion Posted August 2, 2023 Share Posted August 2, 2023 3 minutes ago, 555 said: When programming in burst height of the CBU97, the manual says "BURST HEIGHT: determines the altitude (in feet MSL) at which the bomblets will be released" (page 496). I'm not sure that this makes sense to me - the highest value that can be set is "K" or 3000 feet. What if you wanted to drop these on a target at say 4000 ft MSL? Surely this setting should be AGL? I might be worng but IMHO can't be AGL, unless the weapon has a altitude measurement device on board (like a radar). Likely the fuze uses pressure to compute the altitide thus should be MSL RDF 3rd Fighter Squadron - "Black Knights": "Ar Cavajere Nero nun je devi cacà er cazzo!" My Blog (Italian): Notti a (Video)Giocare ~~~~~~~~~~~~~~~~~~~~~~~~~ CPU: i7-11700K@5GHz|GPU: RTX-4070 Super|RAM: 64GB DDR4@3200MHz|SSD: 2x 970EVO Plus + 980 EVO Plus|HOTAS Warthog|TrackIR 5| Link to comment Share on other sites More sharing options...
KlarSnow Posted August 2, 2023 Share Posted August 2, 2023 The fuze is a radar proximity fuze... If it doesnt have that it opens based on time. 1 Link to comment Share on other sites More sharing options...
555 Posted August 2, 2023 Author Share Posted August 2, 2023 10 minutes ago, LordOrion said: I might be worng but IMHO can't be AGL, unless the weapon has a altitude measurement device on board (like a radar). Likely the fuze uses pressure to compute the altitide thus should be MSL I would think that using a radar altimeter would be able to measure AGL, but the manual specifically mentions MSL so it must be a barometric altimeter. That said, I go back to my question then this method of deployment would not work at any point over 3000 ft MSL which doesn't make sense to me. I suppose then you would need to use the "Burst time" option, which seems a little like guesswork as you would need to understand the time based on your altitude etc... Link to comment Share on other sites More sharing options...
MagicSlave Posted August 2, 2023 Share Posted August 2, 2023 Indeed, there are two fuze options: internal and the fzu-39/b. The former has a timer and the latter a small radar altimeter, see for example: https://cat-uxo.com/explosive-hazards/fuzes/fzu-39-fuzeSent from my FP4 using Tapatalk Link to comment Share on other sites More sharing options...
KlarSnow Posted August 2, 2023 Share Posted August 2, 2023 google FZU-39... this is the radar proximity fuze you are setting. If the manual says MSL it is a typo. 1 Link to comment Share on other sites More sharing options...
555 Posted August 2, 2023 Author Share Posted August 2, 2023 1 minute ago, KlarSnow said: google FZU-39... this is the radar proximity fuze you are setting. If the manual says MSL it is a typo. Yep - the manual says MSL so clearly a typo - thanks for clarifying this. 1 Link to comment Share on other sites More sharing options...
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