Scale conversion question

Scale conversion question

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11 June 2010 at 02:26 #27228
Nederlander
Participant
@nederlander
I’ve just purchased the plans of Bluebird II by J. Pottinger which are drawn in 1/30th scale. I would like to build in 1/24th. My math tells me to multiply the existing drawings by 1.66 to reach the desired size. Does this sound right?

Thanks
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11 June 2010 at 02:26 #6653
Nederlander
Participant
@nederlander
11 June 2010 at 08:01 #27230
michael kemish
Participant
@michaelkemish72883
Hi,

30/24=1.25

(I think!)

Mick
11 June 2010 at 13:17 #27239
Mike Pendlebury
Participant
@mikependlebury45959
Correct Mick, Multiply all dimensions by 1.25. Or go to your local plan copy shop and have them blown up by 125%.

Mike
12 July 2010 at 11:37 #27633
Mzee
Participant
@mzee
Where possible I scan and print to the desired enlargement/reduction factor and for all other measurements I use my slide rule – remember them? – which is a far quicker way to convert scale measurements than fiddling with a calculator . Robin
12 July 2010 at 12:09 #27637
michael kemish
Participant
@michaelkemish72883
Robin,

I still have my old plastic circular slide rule (given to me by a pilot friend after he got his licence & could afford a proper one!!)

Circular slide rules have the advantage of you don’t get to the end of the stick and lose track , you just addsubtract 10(?) I forget now

Mick
12 July 2010 at 13:32 #27639
Mzee
Participant
@mzee
Hi Michael,

Nice to know there is someone else who knows what a slide rule is

Never seen a circular one but it makes sense. I used to have an old Otis King cylindrical ‘guessing stick’ which had a scale equivalent to a 6ft rule!

Rob
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