Maths Question!

Okay FoA Brain Trust. I have a question.

I have to scale down a building to make a model. No biggie there. Thing is – 1:75 seems to be the best size-wise.

So I’m sussing out how big this thing will need to be and I do this math:

[i]1m @ 1:100 = 10mm
1m @ 1:50 = 20mm

Therefor (in my head) – 1m @ 1:75 should be 15mm[/i]

But. It’s. Not. – it’s actually 13.3mm – and while I’m happy to accept that, it’s really frustrating me that I can’t get my head around the fact it’s not a straight forward linear progression.

Anyone got a good way to explain this to me? (preferably is poorly drawn MS Paint diagrams)

i saw this exact maths bit on mythbusters the other night.

something something cube root…

//youtu.be/oSOQZZ-oyJw

wait…weight, not dimensions…carry on.

that’s your answer, you can’t tackle it as linear, it dimishing.

at the start, as you increase your ratio, 1:1 1:2 1:3, you get big changes in the scale unit size. but as you get to larger ratios, 1:50 1:60 1:70, the changes become much smaller, until you get to a point where increasing the ratio by hundreds, or even thousands, won’t make much difference to your scale unit size.

1:10000 = 0.1mm
1:100000 = 0.01mm

and someone elses crappy diagram:

1000 / 100 = 10
1000 / 75 = 13.33
1000 / 50 = 20

That’s an absurd scale, Just do it at 1:100 or find a 1:75 scale ruler. Don’t try and work it out

It’s a trick question; nobody makes physical models anymore.

coz percentage difference in the scales (soz no diagrams)
100/75 is 1.33333333333333333333333333*
therefore 1:75 scale is 1.3333 x 1:100 scale (10mm x 1.333333 = 13.33333 mmmmmmmm)

or the other was around 1:50 scale is 75/50 = 1.5 x bigger than 1:75 scale (13.3333333 mmmmm x 1.5 = 20mm

100/50 is still 2 hence 1:50 is twice the size of 1:100

*fingers tyring, just assume infinite 3’s

ftfy, 3d printers or nuffin.

Not linear

Hey now, that’s my job!

they’re both travelling at 16km/h.

^ Milson Island Rec Hall?

Yerp! Was for some kind of competition in Germany. Made it there and back in one piece so I guess I made it well?

I went to Milson Island for a school camp.