How to calculate the height required to pivot an object vertically

jaggiebunnet · 12-08-2010 07:56PM #1

ok i know there is a dead simple equation for this but i am fecked if i can remember or find it:

I have an 8 foot ceiling and a (roughly) 7.5 foot sofa that I need to pivot vertically. It doesn't. So my question is how do you calculate the space required for an object (in this case a sofa) to pivot fully vertically?

Hope that makes sense - cheers.

3DataModem · 12-08-2010 08:01PM

Depends on length of sofa on shortest side (usually top to bottom).

Length squared plus short side squared should be equal or less than ceiling height squared.

jaggiebunnet · 12-08-2010 08:20PM

really?

so for sake of argument 8foot sofa by 3 foot height would be

8sq + 3sq = height required?

64 + 9 = 73 foot?

or is it 73foot sq in otherwards around 8.5 foot? that sounds about right.

bnt · 12-08-2010 08:49PM

jaggiebunnet wrote: »

or is it 73foot sq in otherwards around 8.5 foot? that sounds about right.

That's it - using the Pythagoras formula. To put it another way: if the long and short sides of the sofa form a rectangle, then the radius of the sofa while pivoting is the diagonal of that rectangle, which is significantly longer than the long side.

jaggiebunnet · 12-08-2010 08:54PM

brilliant - thanks guys - i knew i should know this, that guy Pythagoras knew his couches alright

How to calculate the height required to pivot an object vertically

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