Raisuli Posted May 20, 2020 Posted May 20, 2020 This has nothing to do with anything other than scratching my curiosity, but what stops the shuttle at the end of the stroke? There's a (relatively) enormous amount of mass moving at fairly descent speed when the shuttle, piston, and all that associated metal hits the end of the track. Call it 100 pounds at 250 fps, that's 0.00003147 kilotons equivalent (about 13,000 joules). There has to be a hydraulic, pneumatic, or steam powered buffer in there somewhere, and that has to reduce the length of the shot felt by the aircraft by a few feet.
victorlima01 Posted May 20, 2020 Posted May 20, 2020 Water brakes. http://www.navybmr.com/study%20material/14310a/14310A_ch5.pdf
Psydshow Posted May 20, 2020 Posted May 20, 2020 Water brakes. http://www.navybmr.com/study%20material/14310a/14310A_ch5.pdf You beat me by seconds!
GTFreeFlyer Posted May 20, 2020 Posted May 20, 2020 Just more info to supplement your knowlege. No one ever asks about the holdback bar, lol. I've been involved with the holdback bar industry. Think about all that tension in the HBB suddenly being released, yet the HBB just plops down instead of firing off the aft end of the deck. The HBB's contain complex mechanisms inside of them. Each one is tuned for a specific type aircraft, to release at a certain load. The catapult simply pulls and pulls until the holdback bar decides when to release. The HBB contains its own damper system which allows it to just plop down after release. I was amazed at the mechanical complexity of what is inside a holdback bar when I first saw it. Cheers My DCS Missions: Band of Buds series | The End of the T-55 Era | Normandy PvP | Host of the Formation Flight Challenge server Supercarrier Reference Kneeboards IRL: Private Pilot, UAS Test Pilot, Aircraft Designer, and... eh hem... DCS Enthusiast
Larkis Posted May 20, 2020 Posted May 20, 2020 Just more info to supplement your knowlege. No one ever asks about the holdback bar, lol. I've been involved with the holdback bar industry. Think about all that tension in the HBB suddenly being released, yet the HBB just plops down instead of firing off the aft end of the deck. The HBB's contain complex mechanisms inside of them. Each one is tuned for a specific type aircraft, to release at a certain load. The catapult simply pulls and pulls until the holdback bar decides when to release. The HBB contains its own damper system which allows it to just plop down after release. I was amazed at the mechanical complexity of what is inside a holdback bar when I first saw it. Cheers Wow indeed, i never thought about that.Thanks for the insight
Diesel_Thunder Posted May 20, 2020 Posted May 20, 2020 Just more info to supplement your knowlege. No one ever asks about the holdback bar, lol. I've been involved with the holdback bar industry. Think about all that tension in the HBB suddenly being released, yet the HBB just plops down instead of firing off the aft end of the deck. The HBB's contain complex mechanisms inside of them. Each one is tuned for a specific type aircraft, to release at a certain load. The catapult simply pulls and pulls until the holdback bar decides when to release. The HBB contains its own damper system which allows it to just plop down after release. I was amazed at the mechanical complexity of what is inside a holdback bar when I first saw it. Cheers And that is the re-useable bar. Didn't the old ones use a piece of steel or aluminum that broke free once a certain amount of tension (launch) was applied? PC: MSI X670E, Ryzen 9 7900X, 64GB DDR5 RAM, RTX 3090 Ti, TM Warthog HOTAS, Saitek Pro Flight pedals, Opentrack Link to my Youtube Channel: https://www.youtube.com/c/DieselThunderAviation Commander, 62nd Virtual Fighter Squadron Join the 62nd VFS today! Link to our discord server: https://discord.gg/Z25BSKk84s
Raisuli Posted May 20, 2020 Author Posted May 20, 2020 Just more info to supplement your knowlege. No one ever asks about the holdback bar, lol. I've been involved with the holdback bar industry. Think about all that tension in the HBB suddenly being released, yet the HBB just plops down instead of firing off the aft end of the deck. The HBB's contain complex mechanisms inside of them. Each one is tuned for a specific type aircraft, to release at a certain load. The catapult simply pulls and pulls until the holdback bar decides when to release. The HBB contains its own damper system which allows it to just plop down after release. I was amazed at the mechanical complexity of what is inside a holdback bar when I first saw it. Cheers Which is a step up from the old dog biscuits. I've heard, but never confirmed, that you can dial in the holdback setting on the bar to some degree. Is that true, or is each bar set to a specific value?
Raisuli Posted May 20, 2020 Author Posted May 20, 2020 And that is the re-useable bar. Didn't the old ones use a piece of steel or aluminum that broke free once a certain amount of tension (launch) was applied?
Heimz Posted May 20, 2020 Posted May 20, 2020 Imagine how many of the old bridles are in the ocean rusting away, before the Navy implemented the Launch Bar.
EagleA25 Posted May 20, 2020 Posted May 20, 2020 Water brakes. http://www.navybmr.com/study%20material/14310a/14310A_ch5.pdf Was wondering about that one myself... Thanks :thumbup:
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