C3PO Posted January 15, 2022 Share Posted January 15, 2022 Hi, When dropping penetration bombs, or just mk84s, does a fuse delay of 5ms per floor of a building sound about right…so 15ms tail fuse to punch through three floors before detonation? Now: Water-cooled Ryzen 5800X + 32GB DDR 4 3200 RAM + EVGA 3090 FTW3 Ultra 24 GB + Reverb G2 + Add-on PCI-e 3.1 card + 2x1TB Corsair M.2 4900/4200 + TM HOTAS Warthog + TM TPR Pendular Rudder 'Engaged Defensive' YouTube Channel Modules: F/A-18C / AV-8B / F-16 / F-15E / F-4E (when it lands) / Persian Gulf / Syria / Nevada / Sinai / South Atlantic Backup: Water-cooled i7 6700K @ 4.5GHz + 32GB DDR4 3200MHz + GTX 1080 8GB + 1TB M.2 1k drive & 250GB SSD drive 500MBps 4K 40" monitor + TrackIR 5 Link to comment Share on other sites More sharing options...
DD_fruitbat Posted January 15, 2022 Share Posted January 15, 2022 Protocol droids should not be dropping bombs. 3 Link to comment Share on other sites More sharing options...
Blinky.ben Posted January 15, 2022 Share Posted January 15, 2022 4 minutes ago, DD_fruitbat said: Protocol droids should not be dropping bombs. 3 Link to comment Share on other sites More sharing options...
Solution Frederf Posted January 15, 2022 Solution Share Posted January 15, 2022 Depends on the terminal speed, impact angle, and the post-impact slowdown. 590 knots is 1000 fps which is 1' per ms. I did a test and got about 1500 fps with a GBU-31v3 which is about 1.5' per ms. For terminal angle divide by the sine of the angle from horizontal, e.g. +15% for 60° +40% for 45°. Slowdown is the most nuanced. A thin, soft building won't reduce speed as much as something hard. If you knew the burying depth for a given impact (e.g. 20' at 1000fps) then you could assume it was losing 50fps per foot of hard material. Maybe think a commercial high rise is 3' worth of hard surface every floor so 6' total. Take the average of the initial impact speed, final speed 1000+900/2 = 950. Tin shack practically nothing, concrete bunker much more. So you want to go 25' (one and a half floors) through say 6' of hard material at 1300fps average on a 60 degree impact angle. T = 25/1300 * 1/sin(60) = 22ms. That seems quite a small delay. I think 60-180ms is more common historically but that might be against hardened targets which would bring down the average velocity a bunch. 5ms per floor sounds too short as it would have to be covering an average of 2000fps of height change. And of course this all depends what FMU is on the bomb. If it's -152 then you can program it on the fly. If it's -148 then your SMS settings don't change anything. 1 3 Link to comment Share on other sites More sharing options...
C3PO Posted January 17, 2022 Author Share Posted January 17, 2022 Thank you - superb knowledge there. Now: Water-cooled Ryzen 5800X + 32GB DDR 4 3200 RAM + EVGA 3090 FTW3 Ultra 24 GB + Reverb G2 + Add-on PCI-e 3.1 card + 2x1TB Corsair M.2 4900/4200 + TM HOTAS Warthog + TM TPR Pendular Rudder 'Engaged Defensive' YouTube Channel Modules: F/A-18C / AV-8B / F-16 / F-15E / F-4E (when it lands) / Persian Gulf / Syria / Nevada / Sinai / South Atlantic Backup: Water-cooled i7 6700K @ 4.5GHz + 32GB DDR4 3200MHz + GTX 1080 8GB + 1TB M.2 1k drive & 250GB SSD drive 500MBps 4K 40" monitor + TrackIR 5 Link to comment Share on other sites More sharing options...
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