Citizen Navihawk/Skyhawk: How to Use the Slide Rule Bezel

[abdeckungdi]

BEST BUY amzn.to\zlWFxG

Customer Reviews:

I bought this watch because I wanted a more stylish replacement for my Casio. It had to meet two important criteria: 1. It had to set itself atomically 2. It had to be self-powered. This Citizen watch does both those things, and looks great doing it. It feels incredibly solid, and consequently is a very heavy watch. You might want to go to ...

For more details please copy the Amazon link below in your browser:

amzn.to\zlWFxG

[schitlipz]

Inaccurate to say the least. My God, 3*3 is a tad greater than 9. And the manual has some bad translation on finding roots (very bad translation).

I've got a titanium btw.

In any case, do you know if roots can be found using this exact similar bezel or is it a page they should have left out of the manual? Thanks in advance, bro.

Wow. In one week I've found half dozen ways this watch could be better.

[nikudes]

@schitlipz Yes there is a way to find roots. It's sort of like doing a division problem. To divide 20 by 40 for example, you'd move 20 on the outer bezel ring opposite 40 on the inner ring and read the answer opposite 10 on the inner ring: 50 (meaning 0.5 because you have to figure the decimals out on your own). But you want the square root, meaning the condition in which both multipliers are equal.

[nikudes]

@nikudes So to find the root of 20 turn the bezel until the number opposite 20 on the outer ring, and opposite 10 on the inner ring, are the same. In this case that's about 45 (meaning 4.5). The square of 20 is actually about 4.47.

[schitlipz]

@nikudes Yeah, I was messing around with the root thing and figured the "fine-tuning" thing. It's not particularly helpful because because finding two similar numbers at different parts on the bezel isn't a quick operation. Also, more importantly, square roots (or third, fourth, etc) have two values depending on the decimal position. Example: root of 7 and 700 are numerically the same, 70 and 7000 too, though different. I'm not sure why, but if you read the value at root 10 ie 3.16

[schitlipz]

@schitlipz ... (316) instead of 10 you can find that other root value. This is a curious thing I've never noticed in any math class.

Does anybody know why there are two roots depending on decimal place? It's not as simple as "even roots having two values". It must have something to do with the numerical base... perhaps. Ideas?

[negolatak]

This is a very good video but I don't understand what you mean by "point of origin" when you're talking about division and multiplication?? Please explain?

[nikudes]

@negolatak I refer to the number 10 on the inner ring as the "point of origin" because that's where one starts counting numbers. It's the equivalent of zero. It just means that if you divide any number on the outer ring by the one underneath it on the inner ring, you can find your answer on the outer ring opposite the point of origin (which is the number 10 on the inner ring). Does that make sense?

[negolatak]

@nikudes Yeah, I finally understood that a little while later, but thank you anyway. I wonder why there's no "0" as point of origin though, why it would start on 10 and not on 0?

[nikudes]

@negolatak I'm not sure. Slide rules usually start on 1. you could think of 10 as 1.0 and 11 as 1.1 because the decimal point depends on how you define the numbers. But why no zero? I don't know. You'll have to ask someone better at math than I am.

[blakerwalk]

great vid, thanks !

[07350z]

very informative video, thanks for posting

[mob1235]

thanks very much. i always wondered how this works.

no i have a pilots watch myself and use it this way for fun^^

[MrPokemonmaster786]

Thanks Dude, but do these rules apply to a casio Edifice watch with a circular slide rule Bezel quite similar to this one?

[gwoopy1]

thanks have a nighthawk ,also i love all citizen ecodrive watches they are excellent.

[ken151979]

Thank you so much! I have a Hamilton, I'm glad I found your vid on Slide Rule Bezil how to

[Elfolalo]

just what i need! thanks !

[chompswhizz]

thanks .. this helped out a lot.. after a couple of months with my watch.. Its good to finally know how to use the slide rule!

[BrianTakesValium]

I have a skyhawk and it sais WR 200, does that mean i can go underwater up to 660 feet?

[nikudes]

@BrianTakesValium No, but those ratings can be confusing. Look up "diving watch" on Wikipedia. The section called "Water Resistance Classification" should clear things up.

[BrianTakesValium]

@nikudes thanks

[Crashtruk2]

Thanks mate. Very clear instructions. I used this to teach myself this watch. Good Karma you way buddy!

[nikudes]

@Crashtruk2 You're welcome. Glad it helped. Thanks for the Karma wishes!

[g7895718]

Ive been using pilot chronograph since I learned to read time on a clock , but I realy wanted to learn the fancy trick my uncle used to do as a pilot on his watch , and today Finally I can, thanx to you .

[nikudes]

@g7895718 Cool! Nice to hear. Glad the video helped.

[SoonerBourne34]

This helped out so much more than the thick book that came with the watch. Well done and thanks!

[Karlaaa94]

Hello. I have looked up a lot of skyhawks and how come your skyhawk(navihawk Japan) doesn't have the yellow pointers each 90 degrees ? I really want to find a skyhawk without the yellow pointers.

I love your watch

[nikudes]

@Karlaaa94 This is model was only available in Japan, as far as I know. There are some US models that don't have the arrows. Try searching for model JR3060-59F or JY0005-50E. Good luck.

[nikudes]

@Karlaaa94 There are lots on the market now that don't have yellow pointers. Check out Princeton Watches online for example. They've got a bunch.

[kickmyanus]

very nice video dude. thank you.

[bestvidsdottk]

What if you want to convert 120 mph to kph? Is it possible? I tried substituting a zero in the 120 and it didnt work.

[nikudes]

@bestvidsdottk Most slide rule bezels, this one included, have marks on one of the rings for simple conversions like this. In this case you'd line up 12 (remove a zero) on the mark labeled "STAT.," which stands for "statute miles." Opposite the mark labeled "KM." (for kilometers) you'd read off the number, in this case about 19.3. Move the decimal over one to the right (basically the opposite of what you did before) and you end up with 193, so 193 kph.

[nikudes]

@bestvidsdottk You can also do it using the multiplication method I describe in the video but then you have to know the conversion factor between mph and kph, which is about 1.6. So 120 mph x 1.6 = about 192 kph. So I was a little off in reading the bezel in my earlier reply.

[bestvidsdottk]

@nikudes thanks!!!

[pedrogremioo]

nice wacth

[darfung]

nice vid but i think i will stick to my Pooleys - CRP-5 Computer

[GadgetsNGear]

really helpful! thankyou!

[UpsideDownInfo]

Thank you for uploading this video

[TheCodezzzz]

Thanks for this vid Nick now i can do my homework well

[anees7112]

ROFL!! 9x9 =81

[darkwaterspider]

Amazed! Kewl! Never thought this lot can be done over this simple slider. :) Thanks, really appreciate this

[nikudes]

Thanks for the feedback you guys...

[avisbaby]

Great stuff m8

[B17MIKE]

Thanks for posting- Great video! Can you recommend an inexpensive watch that can do the rate/time conversions? All I can find are the 2 ring slide rules for $100 + Thanks!

[nikudes]

All I can think of is a calculator watch. Of course, then you get decimals versions of time. Sorry I couldn't be of more help.

[B17MIKE]

Thanks for your reply. Can you do rate/time with the simple slide rule, or do you need the inner ring? Thanks again!

[nikudes]

Doing rate/time/distance calculations with a normal slide rule would be just like using a calculator. You'll get time in decimals (2.5 hours, for example). Search online for an E6B flight computer. It's like a slide rule but it has a time ring. They're about $25. That might be just what you're looking for.

[nakmos14]

the speed your using is MPH, but worldwide aircraft speed is usually measure in KNOTS or Nautical Miles/hour ? so how do i measure the rate/time/distance if i want to use KNOTS then ?

[nikudes]

@nakmos14 It really should be "units/hour." You can use any units you want, e.g. mph, knots, kph, gallons/hour, liters/hour, and the calculations will still work. Try it out.

[DaToCyLi]

Thanks, really enjoy your videos. Keep them coming!

[houmam52823]

very helpful thank you!

[Furyjoell]

I have this same watch. Just the Eco-Drive version. Nice to finally know how to use the bezel. Good video

[nikudes]

Thanks, glad to hear it was helpful.

[Monito1971]

Great tutorial video. I just ordered a new Seiko SNJ017 flight computer world timer watch with the H023 movement and an EB6 slide rule.

[jeremiashop]

Nice, good demonstration! Interesting watch, too.

[nikudes]

Thanks!