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20th August 2003 | 00:11

#1 (permalink)

ABO944

Thread Starter

Joined: Aug 2002

Posts: 310

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From: U and K

Scale questions

Hello there ...

Having trouble working this out! Can anyone help me please?

A earth distance of 45nm is shown on a chart by a distance of 12 inches. The scale of the chart is:

a)1:27,400
b)1:36,500
c)1:365,000
d)1:274,000

The other question is ...

A chart represents 20 statute miles by 20 centimetres. The scale of the chart is:

a)1:100,000
b)1:161,000
c)1:1,610,000
d)1:1,200,000

Thanks a lot

Hope someone can help ....

Best regards,

Thicko

20th August 2003 | 00:21

#2 (permalink)

NineEighteen

Joined: Mar 2003

Aviation Qualifications: PPL

Posts: 225

Likes: 21

From: London, England

Scale = CD/ED (Chart Distance/Earth Distance)
Make distances into the same units
cancel down

I Hope that helps

I got (d) and (b)

0918

20th August 2003 | 00:34

#3 (permalink)

whydididoit

Joined: Aug 2003

Posts: 13

Likes: 0

From: FLA,USA

Hello there ...

Having trouble working this out! Can anyone help me please?

A earth distance of 45nm is shown on a chart by a distance of 12 inches. The scale of the chart is:

45*72960/12

72960 is the number of inces in a NM.. so I would go with d (i got 273600)

The other question is ...

A chart represents 20 statute miles by 20 centimetres. The scale of the chart is:

20SM is about 32km so..

32*1000*100/20 = 160,000 so i would go with b

sm*meters*cm/chart distance.

Hope it helps