GENERAL

[1hill@aTime]

now joe that's even more confusing

[bob_the_builder]

1Hill, think of a triangle...

Modelling gradients as percentages using metre rulers and elastic

 

http://www.ordnancesurvey.co.uk/images/userImages/misc/education/triangle.jpg

 

To develop children's skills in measuring and expressing gradients

as percentages, metre rulers were used. A metre ruler laid flat on the

ground gives a convenient horizontal distance of 100 units (cms) and

another ruler held upright at one end gives a selection of the same

units for vertical climb. A length of shirring elastic can be used to

link the two rulers for example, a triangle formed in this way with a

100 cm base and 20 cm height has a 20% gradient. This means that a toy

car would climb 20 cms vertically for every 100 cms it travels

horizontally. 20 units out of every 100 = 20%.

 

Using the same triangle, it is also possible to translate

percentages into ratios and vice versa. If the child travels 4 cms

along the horizontal ruler with a toy car and then measures up

vertically from this point to the elastic slope, the height will be 1

cm. This is a 1: 5 triangle. These ratios can be multiplied e.g.:

 

• 8 cms along .......................... 1.6 cms up
• 12 cms along .......................... 2.4 cms up
• 16 cms along .......................... 3.2 cms up
• 100 cms along .......................... 20 cms up (20%)

http://www.ordnancesurvey.co.uk/oswebsite/education/teachingresources/mapwork/investigatinggradients.html

 

 

[1hill@aTime]

or how about this one, when i'm suffering and out of the seat then i know, it's above 10% , thanx for the help BTB

[Ice Man]

12percent on 1km climb =120m of climbing in altitude

[1hill@aTime]

thanx ice man that's the way i would have thought it was, much easier if you speak in eastrand

[bob_the_builder]

 

12percent on 1km climb =120m of climbing in altitude

 

as in 120m divided by 1000m equals 12%? OMG

 

[ShortLegs]

I'll try explain further. A 1/1 gradient is 45 degrees and expressed as 100%.

 

The calculation to get 45 is (100/100) ARCTAN = 45 degrees.

 

For 12% the calculation is:

(12/100) ARCTAN = 6.8 degrees

 

On a scientific calculator to get this you hit INV (12/100) TAN and hey presto.

[Joe Low]

now joe that's even more confusing

 

That's why I said "not you 1Hill"

 

[1hill@aTime]

pictures won't even help, you need to type s l o w l y, cause i can't read to fast.

[controlc]

12percent on 1km climb =120m of climbing in altitude

 

And to make things even more confusing...

 

This isn't 100% correct. Seeing that the 1km climb is on the "diagonal" part of the triangle. You're supposed to use the vertical / horizontal distances, not the vertical / diagonal.

 

But on "normal" climbs the figures would be pretty close.

[1hill@aTime]

12percent on 1km climb =120m of climbing in altitude

 

And to make things even more confusing...

 

This isn't 100% correct. Seeing that the 1km climb is on the "diagonal" part of the triangle. You're supposed to use the vertical / horizontal distances' date=' not the vertical / diagonal.

 

But on "normal" climbs the figures would be pretty close.

[/quote']

 

shoosh!

[scotty]

I'll leave all this complicated stuff to my garmin to work out.

[The Saint]

Scotty I'm with you on this one.

[1hill@aTime]

scotty we seeing you tomorrow morning?

[scotty]

Not tommorow, the flu bug has got me.

[1hill@aTime]

not good at all, you can keep that...