How much underhang

**Timber_12** · August 31st, 2009, 12:25 PM

How much of an underhung cliff is jumpable? Say if the cliff starting from the exit went straight down at 80 degrees, would that be jumpable by the right people?

How underhung was the most underhung thing that you've jumped?

Thanks
Timber

**Boeris** · August 31st, 2009, 01:46 PM

F that Timber.

**Para_Frog** · August 31st, 2009, 02:30 PM

You could do the calculation, but you'd need some data:

Force of your launch
Angle of your launch

Calculate the arc being sure to account for acceleration of gravity (Vacuum is close enough).

Where it impacts the cliff is your working altitude.

If that number is below, say 200'. Yeah...I'd find another cliff.

Personally, that's way too much work for me - if I can't drop a fucking rock straight down for about 250-300'...negative ghostrider, the pattern is full.

**Flying_Mike_D** · August 31st, 2009, 02:48 PM

I've never jumped a cliff but I'm a math whiz and I can tell you that what Para_Frog said is spot on. If all things were a constant you could do a pretty accurate calculation, but you have no constants since you can't guarantee that your force on exit will be the same as calculated or the same on every jump.

You could just pull a Travis Pastrana and use a motorcycle and be guaranteed of a clean exit, ,but then your body position would be all fucked up and everyone would hate you if you didn't clean up your mess! LOL

**Para_Frog** · August 31st, 2009, 02:53 PM

I've offered to take you off a cliff ya big pussy.

**Flying_Mike_D** · August 31st, 2009, 02:59 PM

Which pussy are you referring to? Timber or me?

Must be me ad it must have been over Patron because I don't recall any.... unless you're talking about that place in Colorado....

Too much partying this weekend with the wedding. I'm just starting to feel the hangover today.

**Johnny Utah** · August 31st, 2009, 08:06 PM

here's a jump from the top of the Euromast whereby I needed to clear a pretty sizable observation deck before pulling.

slider-up at Euromast

On this jump the airspace opens up again after the deck, but on a typical underhung object it's usually coming up fast from behind and underneath which can lead to a gnarly 180 situation.

**yuri_base** · August 31st, 2009, 09:00 PM

With Wingsuit Studio (see other thread in this forum), you can answer theoretical questions like these easily.

THEORETICALLY

Practically? Don't do it!

**lifewithoutanet** · August 31st, 2009, 09:13 PM

Originally Posted by yuri_base

With Wingsuit Studio (see other thread in this forum), you can answer theoretical questions like these easily.

THEORETICALLY

Practically? Don't do it!

Make it for Mac. :-)

**yuri_base** · August 31st, 2009, 09:19 PM

I've never actually run it NOT on a Mac.

***mknutson*** · September 1st, 2009, 11:18 AM

Originally Posted by yuri_base

I've never actually run it NOT on a Mac.

You could always use:
https://www.vmware.com/products/fusion/

**lcspx** · September 4th, 2009, 09:52 AM

I've wondered about the underhang as well
this is 400+ to the top of the tower.. 180'ish to the road deck...
i've thought about hanging a streamer off a tower as far out as the bridge support kicks out...