Throw of the weight of a smaller civilian helicopter such that vertical take off is a highly dangerous thing to attempt?
Yes.
Hold a smaller civilian helicopter from making a lateral take off (much safer when the the weight's thrown off) by using leverage (barely managing to do so, at that) after being dragged across the helipad?
It's out there, but not exactly a ridiculous feat of strength. Kicking a pickup truck hard enough to send a man flying is a better feat, really.
Going to point out he was losing his grip until he buckled down, and even then was still losing the fight. Then Bucky decided slamming the helicopter into the Helipad was an intelligent strategy.
But a helicopter that small would have a hell of a time breaking a line tying it down. What Cap did is not nearly as impressive as you want it to be. Sorry.
Not sure how much this affects the discussion, nor if this is the exact helicopter in question (I haven't seen the movie), but here are some specs for a civilian helicopter.
http://deltahelicopters.com/bell206b.html
There's a maximum external load limit of 1000 lbs. It's not like these things can pick up cars or anything.
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"...dropping an orca whale made of fire on your enemies is a pretty strong opening move." - Nik
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True, but he's resisting 1,000 pounds of lift with just four fingers and a thumb.
Dude kicked a truck hard enough to send a guy on the other side flying, lifts motorcycles with people on them, and other such feats of strength, and you think resisting a thousand pounds is some insane feat?
Fortunam adversarius, nihil prosperum habebitis
I would say the chopper looks most like an AS350 which has a useful load of over 2400 pounds (since I can't find a number for lift force from the rotor, we can use this as the max force Cap is resisting). Holding against that force with one hand is pretty beastly, certainly right up there with throwing the motorcycle. I think the kicking the truck feat is the best strength feat he has, outside of damaging Iron Man's armor (though I would say that last one is dubious).
The full fight is online now:
https://www.youtube.com/watch?v=4taiDNSdCSE
Go look at the clip, unless Disney's killed it already, the second he grabs the helicopter it starts to lean towards him, no pilot who knows anything about helicopters is going to keep going up when that happens, and when he decides to go sideways Cap gets dragged along for the ride without much resistance until he's able to grab the bar(where it does become a pure strength feat). And since the Helicopter is still doing every bit as much of the work when it's going sideways as when it's going up I'd say saying Cap overpowered it is at odds with what's on the screen
No, the helicopter dips towards him initially. Then the helicopter drags Cap laterally... because Cap has nothing to grab onto, and he has the body weight of a muscular guy. By the time they are in a tug of war, with Cap holding onto the railing, there is no dipping. It is a clear strength feat, though not Cap's best.