SDT

#1
Ok chaps I know SDT calculations have been done to death on here...but I'm still struggling to be at the standard I require! I really want to bring my A Game and just cannot make a breakthrough with these.

Anybody know any websites or literature that might enable me to get my head around this?
 
#4
If you use that site for about 45mins a day you'll find STD a walk in the park by the end of the week. On top of that just remember to change the times into fractions - makes it that bit easier

I'll give you an example and I hope it helps rather than confusing the hell out of you.

What speed equates to 108 miles in 1hr 21min?

First of break the time down into a fraction so 1hr 21mins is the same as 1 & 7/20 (there being 20 units of 3mins in an hour)

This becomes 108 x 27/20

The following step is to multiply 108 by 20 which equals 2160.

From that divide 2160 by 27 which is hard enough or you can make it easy for yourself and divide 2160 by 3 to get 720 and then by 9 to get an answer of 80mph.

Like I said I hope I haven't scared you off with that equation - best of luck!
 
#6
Blimey, that sounds complicated! Most of the calcs you do will be of TIME, I think, as the Planex seem to give you distance and speed; eg. you can travel at 3 km/hr over some sort of rough terrain and have 8km to travel.
Try learning how long it takes to go 1km (or mile) at given speeds;
eg. at 5 Km/hr it takes 12 min to travel 1 Km, so 7 Km would take 7x12 min = 84 min
at 15 Km/hr it takes 4 min to travel 1 Km, so 11 Km would take 11x4 min = 44 min and so on!
Make a table of most likely speeds; 2,3,4,5,6,10,12,15,20,30,60 Km/hr and corresponding times for 1 Km and get someone to keep firing them at you once you have learned them!
 
#7
I think I'm screwed when it comes to Main Board.
 
#8
Le_Tomato said:
If you use that site for about 45mins a day you'll find STD a walk in the park by the end of the week. On top of that just remember to change the times into fractions - makes it that bit easier

I'll give you an example and I hope it helps rather than confusing the hell out of you.

What speed equates to 108 miles in 1hr 21min?

First of break the time down into a fraction so 1hr 21mins is the same as 1 & 7/20 (there being 20 units of 3mins in an hour)

This becomes 108 x 27/20

The following step is to multiply 108 by 20 which equals 2160.

From that divide 2160 by 27 which is hard enough or you can make it easy for yourself and divide 2160 by 3 to get 720 and then by 9 to get an answer of 80mph.

Like I said I hope I haven't scared you off with that equation - best of luck!
Fecking hell mate!
 
#10
Makes me wish I was trying to get into the army of 100 years ago. They'd just give you a gun, point you in the right direction, and let you get on with it. Never a word of fractions.
 
#11
is this easier?

1hr 21mins = 81 mins

you need to find out how many miles per min... so:

108 (miles) divided by 81 (mins) = 1.33

this is miles per min so to convert to miles per hour multiply by 60

=80
 
#12
whisky_octopus said:
Makes me wish I was trying to get into the army of 100 years ago. They'd just give you a gun, point you in the right direction, and let you get on with it. Never a word of fractions.
You have obviously never heard of the Royal Military Academy in Woolwich where they taught Maths and Science to degree level!

Litotes
 
#13
Litotes said:
whisky_octopus said:
Makes me wish I was trying to get into the army of 100 years ago. They'd just give you a gun, point you in the right direction, and let you get on with it. Never a word of fractions.
You have obviously never heard of the Royal Military Academy in Woolwich where they taught Maths and Science to degree level!

Litotes
Yeah but Woolwich would have been Artillery wouldn't it? That's why Royal Artillery never allowed commissions to be bought, they had to be qualified.
So there.
 
#14
lightlyseasonedvet said:
is this easier?

1hr 21mins = 81 mins

you need to find out how many miles per min... so:

108 (miles) divided by 81 (mins) = 1.33

this is miles per min so to convert to miles per hour multiply by 60

=80
Dunno really but I'd find that harder to do in my head!
 
#16
Again I don't know, I'm just making sure that I have STD sorted before briefing. My STD was awful about a month ago (due to relying on calcs) so I thought it best to make sure I wouldn't make an arrse of myself when asked any questions......mind you nerves could get the better of me!
 
#17
Litotes said:
J_E_P said:
Those are a little harder in all honesty, so if you get that sites down happily, your game.
:? :? :?
That sites SDT questions to me were significantly harder than the ones appearing as standard during the main board. Thus if you can get to the point where those are easy.....your ahead of the game.

But you already knew i meant that i imagine.
 
#18
Glad to see I'm not the only one who needs brushing up on my math. I've been practicing for a few days now and can see an improvment already, that site will help no end. As a reply to my own message- i have found www.math.com an awsome reference. search for rate distnace time and go for it. it starts easy with explainations then builds you up.
 
#19
Blimey, that sounds complicated! Most of the calcs you do will be of TIME, I think, as the Planex seem to give you distance and speed; eg. you can travel at 3 km/hr over some sort of rough terrain and have 8km to travel.
Try learning how long it takes to go 1km (or mile) at given speeds;
eg. at 5 Km/hr it takes 12 min to travel 1 Km, so 7 Km would take 7x12 min = 84 min
at 15 Km/hr it takes 4 min to travel 1 Km, so 11 Km would take 11x4 min = 44 min and so on!
Make a table of most likely speeds; 2,3,4,5,6,10,12,15,20,30,60 Km/hr and corresponding times for 1 Km and get someone to keep firing them at you once you have learned them!

Bit miffed no-one liked my method! :(
 
#20
Le_Tomato said:
What speed equates to 108 miles in 1hr 21min?!
A slightly easier way than dealing with 27/20ths or whatever it is...

108:81
12:9
4:3

SO..

4 miles every 3 minutes.
20 miles every 15 minutes.
80 miles every 60 minutes.

Job done.