Sofa-will it fit?

DT12

Pivot! Pivot!

DaftyDuck

It's the turning that's the problem, it always is, and there's a mathematical formula to work it out.... no, but there is.... seriously!

If a is corridor width, with a 90° turn, a 2-dimensional sofa of length L will fit if:

L² = (2a)² + (2a)²

Of course (!), not all corridors are the same size beyond the bend, so width a and width b are different. Then

L² = (a ²/³ + b ²/³)³

When the sofa adds width, w, then you need to calculate a value for m that satisfies:

(bm³-a)²-w²(m²-1)² . (m²+1)=0

then, obviously, the maximum length of sofa is

L² = (1 + 1/m²) (a + mb - w(m² + 1))


and therefore it is simply...

................

Oh, but it's just through the door! Oh, if only I'd read the OP first, I could have saved all those hard sums I just did in my head.....

Take the door off its hinges for the extra few mm. Then shove. Hard.

racing_blue

A right angled triangle with short sides 90 cm and 97 cm could be rotated to present a minimum width (d) of 65.98cm. This would require 42.9 degrees of rotation.

d = 90 x cos ( atan (90/97) )

But your sofa won't be triangular in profile, I guess really you ought to model a triangle sitting on a rectangle. Do you know the distance at the front of sofa from floor to seat (f)?

d = (97x90) / (97-f) sin ( acos (a / sqrt (a^2 + (b-f) ^2 ) ) )

if f=20 cm, d = 73.7 cm
if f=30 cm, d = 77.8 cm

This is making a worst case assumption that your sofa is 90 degrees upright. In reality it probably leans back which buys you some cm.

All values could be subject to a squidge factor depending on the material of your sofa. Anything from foam 0.1, granite 1.0

The arms will need wiggling through in any event

good luck!

DaftyDuck

davidmcn wrote: »

Also - remember to check all the doors which you'll want to get the sofa through...

Yes, a sofa in the hall will lose its attractiveness quite quickly!

jellynose

Despite taking measurements and being assured by the sales assistant that it would fit (they would say that anyway) we had to smash our front living room window to get our new sofa in.

We tried everything and every-way to get the sofa in as did the delivery drivers. We had single glazing at the time so had to smash and replace the window. If you have double glazing you could pop the window out and get the sofa in that way if getting in through the door space does not work.

Loopy28

We got new sofas recently that were massive, really long and deep. We worried right up until delivery but there were no issues, they really are designed to get through doors!

needabed

Make the sofa bigger for simple maths, 97x97, the right angle hypotenuse would be 137, half that is 68.5 and that is the width when the sofa is tilted 45 degrees. And if the sofa has feet you can take the 2 back one's off for more space.

racing_blue

needabed wrote: »

Make the sofa bigger for simple maths, 97x97, the right angle hypotenuse would be 137, half that is 68.5 and that is the width when the sofa is tilted 45 degrees. And if the sofa has feet you can take the 2 back one's off for more space.

but in profile a sofa has 4 sides, like a triangle sitting on a rectangle

fishpond

Cut new sofa into 6 pieces, reassemble in correct position and glue back together.

mrs_blackadder

DT12 wrote: »

Pivot! Pivot!

Shut up shut up SHUT UUUUUUUPPPPPPP!