There is a helicopter in San Francisco grabbing things from the top of a skyscraper and lowering them down?pic.twitter.com/qFf6tc0LCY
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It seems gone after a few passes. I’m curious what it was all about. Rescue? Emergency? I am assuming it’s too dangerous to do training in the middle of downtown.
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Marcin Wichary Retweeted Sahil M Bansal
Better view from someone else:https://twitter.com/smb06/status/990228463146565632?s=21 …
Marcin Wichary added,
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Marcin Wichary Retweeted Chris Lamothe
As a few better-informed people suggested, it was an HVAC unit replacement via a really interesting specialized cargo helicopter: https://twitter.com/banffchris/status/990229809421692928?s=21 … I had no idea this kind of an operation was even an option!
Marcin Wichary added,
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Oddly proud that a snippet of a video I took in my bedroom while half asleep made it into local news:http://abc7news.com/traffic/helicopter-delivers-hvac-unit-to-hotel-in-downtown-sf/3404289/ …
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This, by the way, is how a synchropter (intermeshing rotor helicopter) looks up close. No tail rotor required!pic.twitter.com/FN4Cy0I3tR
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Which now reminds me of fascinating gun synchronizers, allowing guns on planes to shoot directly through the propeller: https://en.wikipedia.org/wiki/Synchronization_gear … (“Among other attempts to get around this was the expedient of firing straight through the propeller arc and hoping for the best.” 0_O)
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Replying to @mwichary
IIRC Germans tried designing synchronisation mechanisms, French just attached metal deflectors to the propeller blades
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That whole page is fascinating – so many approaches.
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