My new watch! |
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dmr100 
Chief Pilot 
Joined: 02 Apr 2008 Location: Sheffield, UK Points: 1571 |
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 Topic: My new watch!Posted: 20 Apr 2008 at 8:00pm |
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Hey
About two years ago I got this tacky england watch which looked ok (it was metal and everything) but was a bit, as I said, tacky. Anyway amazingly it survived for two years and has only just packed in. So yesterday I went into town and got a new watch, and I'm well chuffed! I've always really liked watches so I thought I'd go for something that would be really special for me and I'd definetly look after (I'm very good at looking after things)!
So here it is, my brand new Seiko watch
 ! It cost me £110 so I'm definetly paying for some of it! It's got a stopwatch that can time for up to 12 hours, and can also do things like laps and finishing times for two competitors, e.g. in a running race. The small circle on the right is seconds (real time seconds), the top circle does 20ths of a second (timer) and the bottom circle does hours and minutes (timer). The red second hand does seconds on the timer. It also has a tachymeter (those numbers around the edge), so that I can measure the average miles per hour of a vehicle and also measure how many jobs per hour! It also is water resistant up to 100m/10bar (out of intrest how many millibars is that). I also love it because it's definetly can be a pilots watch because the highest number on the tachymeter is 500, and no car can go at 500mph! Talking about mph and planes, is there any way on a general aviation/comercial aircraft so that you work out when you've done a mile, because in our car there's a display that shows your miles so you can tell when you've done a mile? Thats the first time I've ever uploaded a picture onto photobucket directly from my phone!
Thanks for looking,
Dom
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VulcanB2
Chief Pilot
Joined: 02 Apr 2008 Points: 13365 |
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Posted: 20 Apr 2008 at 8:29pm |
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Hi,
It's called the ASI and your brain!  Forgetting corrections for wind and altitude a moment: if it says 120 kts, that means 120 nm (nautical miles) per hour. Altitude: For every 1,000ft of altitude, add 2% to the IAS to give TAS. TAS in zero wind = GS. Wind is easy to figure out, too (a calculator or flight computer makes this easier): Headwind component = COS(Heading Diff) * Wind Speed Crosswind component = SIN(Heading DIff) * Wind Speed So if you're heading North (000°), and the wind is 022°/45: COS(22-0) * 45 = 0.927 * 45 = 41.7 kts headwind SIN(22-0) * 45 = 0.374 * 45 = 16.8 kts crosswind (from the RIGHT) If you're flying at 5,000 ft: (2% of 120 kts) * 5 + 120 = 10% of 120 = 12 + 120 = 132 kts TAS. Headwind is 41.7kts (from above) so GS = 132-41.7 = 90.3 kts. In 1 minute you travel: 90.3 / 60 = 1.5 nm. QED.  Best regards, Vulcan. |
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frequentflier
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Joined: 04 Apr 2008 Points: 866 |
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Posted: 22 Apr 2008 at 1:06am |
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Well thats a nice watch, but when I bought my watch i just boughtit it was soo nice and guess what it has a little diamond in the middle..
check it out. It wasnt that expensive for something with a diamond
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Talking about mph and planes, is there any way on a general
aviation/comercial aircraft so that you work out when you've done a
mile, because in our car there's a display that shows your miles so you
can tell when you've done a mile?