I wonder why they went with two 48 wheeled sleds instead of the over-the-road Falcon first stage rig?Matthew
Quote from: douglas100 on 12/27/2015 03:40 pmQuote from: Lee Jay on 12/27/2015 03:37 pmI've been up in manlifts thousands of times (literally). Going up and attaching a lifting system is a 10 minute job, and it's pretty much perfectly safe. It's done tens of thousands of times every day in construction.Thanks for that.QuoteWhy make something harder than it has to be?Indeed.Maybe people are wondering how one crane can do both...?I guess this crane has two cables and can operate one cable with man lift independently from the cable that will be attached to the stage..?
Quote from: Lee Jay on 12/27/2015 03:37 pmI've been up in manlifts thousands of times (literally). Going up and attaching a lifting system is a 10 minute job, and it's pretty much perfectly safe. It's done tens of thousands of times every day in construction.Thanks for that.QuoteWhy make something harder than it has to be?Indeed.
I've been up in manlifts thousands of times (literally). Going up and attaching a lifting system is a 10 minute job, and it's pretty much perfectly safe. It's done tens of thousands of times every day in construction.
Why make something harder than it has to be?
Quote from: Jakusb on 12/27/2015 04:08 pmQuote from: douglas100 on 12/27/2015 03:40 pmQuote from: Lee Jay on 12/27/2015 03:37 pmI've been up in manlifts thousands of times (literally). Going up and attaching a lifting system is a 10 minute job, and it's pretty much perfectly safe. It's done tens of thousands of times every day in construction.Thanks for that.QuoteWhy make something harder than it has to be?Indeed.Maybe people are wondering how one crane can do both...?I guess this crane has two cables and can operate one cable with man lift independently from the cable that will be attached to the stage..?No no no...Two independent parallel cables in close proximity is a recipe for disaster.I played with cables and cranes a little bit, I would not recommend such a plan.Crane from one side, man lift at 120 degrees to it, that would be my take.Or some auto latch, but man, you'd have to make damn sure all the snaps clicked in.
Quote from: douglas100 on 12/27/2015 03:40 pmQuote from: Lee Jay on 12/27/2015 03:37 pmI've been up in manlifts thousands of times (literally). Going up and attaching a lifting system is a 10 minute job, and it's pretty much perfectly safe. It's done tens of thousands of times every day in construction.Thanks for that.QuoteWhy make something harder than it has to be?Indeed.Maybe people are wondering how one crane can do both...?
Quote from: Jakusb on 12/27/2015 04:08 pmQuote from: douglas100 on 12/27/2015 03:40 pmQuote from: Lee Jay on 12/27/2015 03:37 pmI've been up in manlifts thousands of times (literally). Going up and attaching a lifting system is a 10 minute job, and it's pretty much perfectly safe. It's done tens of thousands of times every day in construction.Thanks for that.QuoteWhy make something harder than it has to be?Indeed.Maybe people are wondering how one crane can do both...?I guess this crane has two cables and can operate one cable with man lift independently from the cable that will be attached to the stage..?No no no...Two independent parallel cables in close proximity is a recipe for disaster.
Quote from: meekGee on 12/27/2015 04:36 pmQuote from: Jakusb on 12/27/2015 04:08 pmQuote from: douglas100 on 12/27/2015 03:40 pmQuote from: Lee Jay on 12/27/2015 03:37 pmI've been up in manlifts thousands of times (literally). Going up and attaching a lifting system is a 10 minute job, and it's pretty much perfectly safe. It's done tens of thousands of times every day in construction.Thanks for that.QuoteWhy make something harder than it has to be?Indeed.Maybe people are wondering how one crane can do both...?I guess this crane has two cables and can operate one cable with man lift independently from the cable that will be attached to the stage..?No no no...Two independent parallel cables in close proximity is a recipe for disaster.It's done all the time. That's why many larger cranes have a main cable and an auxiliary cable. I've done it with boom cranes and with bridge cranes. It's no big deal if you use a little skill.
Maybe, but I'd rather not have a man cage and a load on the same boom and right near each other.
I wonder why they went with two 48 wheeled sleds instead of the over-the-road Falcon first stage rig?
The main cable is pulled to the top. The cage is raised with no other cables around it. Once the cage is at the top, the crane moves the cage over the stage and the main cable is lowered and the person in the cage connects the cable to the top of the stage. The crane now backs up and lowers the man cage.No, I'm not in construction, but this doesn't appear to be rocket science.
Next things on stage are static fire tests and another LEO recovery?
Quote from: AJW on 12/27/2015 05:37 pmThe main cable is pulled to the top. The cage is raised with no other cables around it. Once the cage is at the top, the crane moves the cage over the stage and the main cable is lowered and the person in the cage connects the cable to the top of the stage. The crane now backs up and lowers the man cage.No, I'm not in construction, but this doesn't appear to be rocket science.That's a lot harder than it sounds. First, you need to have control over where the main cable is (because the lifting spreader bar/attachment rig needs to be over the load center) and the basket (because the humans need to be able to reach all of the attachments) separately. Second, the lifting rig may be heavier than you might think (it includes the weight of the ball/block, the slings and the bar/rig itself) and thus may compromise the very stringent safety standards for lifting people with a crane. By the way, those standards often include a pre-lift with the same mass (in the form of weights in the basket) to the same location, and leaving it there for minutes to many minutes, then lowering it back down, unloading the weights, and getting the humans in.
Could empty landed stage be in the reasonable weight range to be helo lifted? (San Nicholas Island, for example...)
Quote from: dgates on 12/27/2015 11:52 pmCould empty landed stage be in the reasonable weight range to be helo lifted? (San Nicholas Island, for example...)No way.
Defend that. Why not? CH-53K can lift a 35,000lb external load. How much does an empty landed stage weigh?