Scale conversion question

[NederlanderParticipant @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

[NederlanderParticipant @nederlander]

[michael kemishParticipant @michaelkemish72883]

Hi,

 30/24=1.25

(I think!)

Mick

 

[Mike PendleburyParticipant @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

[MzeeParticipant @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

[michael kemishParticipant @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

 

 

[MzeeParticipant @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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