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PostPosted: Sun Oct 04, 2009 8:59 am 
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Roffensian wrote:
Let me be the first to say.........

You mean it moves :!: :!: :!:

:lol:

Like Driver8, only when I first got one - now it's only micro adjustments to ensure it remains properly aligned.



Same Here !

Best Regards,

Enezdez

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PostPosted: Sun Oct 04, 2009 9:07 am 
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Roffensian wrote:
Let me be the first to say.........
You mean it moves :!: :!: :!:
:lol:


:uplaugh: Good one.

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PostPosted: Sun Oct 04, 2009 9:51 am 
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Don't you pilots have a dedicated sliderule to use? Or is it just handier just to use the one on the watch?

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PostPosted: Sun Oct 04, 2009 3:10 pm 
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Amazing!! I didn't think any used a slide rule, let alone a tiny circular one at that. I last used a slide rule in chemistry class in the mid 60's , before the digital calculator. We used the straight ruler type. Our instructor used the circular type which totally confused me at the time. I got pretty good with it and have since purchased one at an antique market just for fun. I need a 2.75 diopter reading glass to even think about using the one on the watch, but I have done so just for fun. I always thought these were more or less just traditional looking. On my Skyracer, I can read the numbers with the reading glasses , but on the Navitimer, those gold colored numbers are impossible. Also, the Navitimer is way to stiff to make it work, whereas the Skyracer is geared and easy to use. I will have to start using it more ! Great post.


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PostPosted: Sun Oct 04, 2009 5:04 pm 
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1952 wrote:
Don't you pilots have a dedicated sliderule to use? Or is it just handier just to use the one on the watch?

Yes, I have the E6-B wizwheel in my flight bag. It is just easier to use the one on my wrist when flying single pilot. It takes two hands to use the E6-B, while I can hold the yoke with my left hand and operate the bezel slide rule (minature E6-B) with the right hand. Although I have navigation equipment in the plane that can perform the calculations, I think every pilot needs to be able to fly the airplane and navigate with a magnetic compass, charts and a watch. So, I practice this skill periodically.

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PostPosted: Sun Oct 04, 2009 6:23 pm 
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onewatchnut wrote:
1952 wrote:
Don't you pilots have a dedicated sliderule to use? Or is it just handier just to use the one on the watch?

I think every pilot needs to be able to fly the airplane and navigate with a magnetic compass, charts and a watch. So, I practice this skill periodically.


Time only matters when concerning fuel!!! I use mine in training student navigators. I can attest that I never used a flight computer back in my day. In my feable world, every calculation dealt in tens or tenths and then rounded up in the case of fuel.

R/


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PostPosted: Mon Oct 05, 2009 3:51 am 
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Interesting.

I presume you make all of your calcs pre-flight and then make adjustments in-flight, according to the loads and conditions?

So during a 2-hour flight, typically how many slide rule calcs would you make?

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PostPosted: Mon Oct 05, 2009 4:44 am 
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It depends on conditions. As another poster stated, time only matters when it concerns fuel (unless you are filing a flight plan into the SFRA which is a subject for another forum).

Yes, you should make preliminary calculations to determine time and fuel requirements. Unfortunately, pilots crash several planes each year because of poor fuel management.

So, in order to know when you will run out of fuel you need to know how long it will take to reach your destination (Estimated Time Enroute). If you know the distance between visual ground references, you can determine ground speed by recording the time it takes to travel from one point to the next and caculating the speed. Then if you know the distance remaining to your destination, you can calculate ETE. If you know the fuel burn rate and how much fuel you had on board when you departed (you did check, didn't you), it's another calculation to determine when you will run out. See, it's all about fuel. Will I run out before I reach my destination?

To answer the question, probably two to four calculations during a two hour flight.

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PostPosted: Mon Oct 05, 2009 5:12 am 
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Fascinating! :D

I always wanted to know how often fliers use their slide rules, and in particular, how relevant it was to have one on the Navitimer.

I suppose it's more comforting to know that I'm wearing a watch which does have a realistically useable feature, not just a piece of garnish. Now i also know how the chronograph is an essential feature of a pilots watch!

OK, i'm probably going a bit OT from the thread, but you back-check your initial calcs, yes? So all of your fuelling calcs are your own responsibility?

Thanks for the insight into the daily life of a pilot! :lingsrock:

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PostPosted: Mon Oct 05, 2009 6:01 am 
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Before we get too far down this path, any aviation GPS navigator will give you your ETE. It will constantly re-calcualate it and dispaly it at every refresh. Many newer aircraft have a fuel flow device that feeds the information into the GPS so it can provide remaining fuel as well. This can all done for you by the current technology.

I only practice the manual calculations to maintain my fundamental navigation skills. They do occasionally come in handy, like the time I flew over two hours at night with a total electrical failure. I made it home safely using basic navigation skills. It can happen to you. :shock:

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