OT - A/C Electrical systems

This new stand alone release based on the legendary War in the Pacific from 2 by 3 Games adds significant improvements and changes to enhance game play, improve realism, and increase historical accuracy. With dozens of new features, new art, and engine improvements, War in the Pacific: Admiral's Edition brings you the most realistic and immersive WWII Pacific Theater wargame ever!

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JocMeister
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RE: OT - A/C Electrical systems

Post by JocMeister »

I´m with Erkki on this one! [:D] I know Ohm law pretty good since I´m an electrician. Why I´m asking is that the losses from resistance should be negligeble over the short distances. That being said I don´t know how long the total lenght of all cabales where in and Aircraft thoses days? It guess it can add up!
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RE: OT - A/C Electrical systems

Post by steamboateng »

I think wdolson was right on; radar & navigation systems increased power demand.
Did WWii aircraft carry IFF equipment?
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Erkki
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RE: OT - A/C Electrical systems

Post by Erkki »

ORIGINAL: steamboateng

I think wdolson was right on; radar & navigation systems increased power demand.
Did WWii aircraft carry IFF equipment?

At least in Europe, many did. But I could imagine them not having being used quite often.
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RE: OT - A/C Electrical systems

Post by pompack »

ORIGINAL: steamboateng

I think wdolson was right on; radar & navigation systems increased power demand.
Did WWii aircraft carry IFF equipment?


Very definitely. A lot of the fighter direction problems at both Santa Cruz and Eastern Solamons were due to a lack of (or malfunctioning) IFF gear. The carrier radars kept picking up inbound a/c without an IFF squawk and vectoring CAP to intercept what turned out to be returning a/c. When the real raids came in the CAP was dispersed from all that mistaken activity. The problem was completely solved by 44 and the Phillipines Sea and thus the Turkey Shoot.
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RE: OT - A/C Electrical systems

Post by Erkki »

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RE: OT - A/C Electrical systems

Post by JWE »

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Who's this Elmo dude???
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RE: OT - A/C Electrical systems

Post by pws1225 »

Well done!
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RE: OT - A/C Electrical systems

Post by steamboateng »

+1 JWE. But from you it may be another one of your silly cons!
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RE: OT - A/C Electrical systems

Post by wdolson »


ORIGINAL: Erkki

And I thought its U=RI Where =V, [R]=capital omega and =A? [;)]

ORIGINAL: witpqs
No Omega on keyboards helped to change that usage I guess, but yes I remember that. I don't recall "U" for voltage, though.



Maybe it's different customs in different countries/languages? In the US, I've always seen the equation as V = IR and the power equation as P = VI. I should have said I^2R losses in my earlier post. Not enough tea that day...

If you substitute IR for V in the power equation, you get another way to calculate power which is (IR)*I, which is I^2R. What it means is that if you have high current, your transmission losses are going to be the square of the current. Even if the resistance is low, the power lost in transmission can be big. By raising the voltage and lowering the current, the transmission losses are reduced.

There is a difference between the unit designation and the letter used in calculations. In calculations, V=Voltage, I=Current, and R=resistance. When showing a value, Volts=V, Amps=A, and Ohms=Ω (omega).

And IFF was used extensively in the Pacific. In the Aleutians ground controlled approach was also used to allow landing in zero visibility conditions. This required the plane to have extra equipment on board. My father was a photographer attached to different units at different times. He flew with B-29s at Saipan, B-25s in New Guinea and the Philippines. At the end of the war he was flying in B-25s out of Attu. He said the Aleutian B-25s were loaded down with a lot of extra electronics that wasn't on the 5th AF B-25s. The planes were very cramped inside.

Sometimes aircraft also had more than one radio and radios were large power hungry beasts back then.

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RE: OT - A/C Electrical systems

Post by witpqs »

ORIGINAL: wdolson
ORIGINAL: Erkki

And I thought its U=RI Where =V, [R]=capital omega and =A? [;)]

ORIGINAL: witpqs
No Omega on keyboards helped to change that usage I guess, but yes I remember that. I don't recall "U" for voltage, though.



Maybe it's different customs in different countries/languages? In the US, I've always seen the equation as V = IR and the power equation as P = VI. I should have said I^2R losses in my earlier post. Not enough tea that day...

If you substitute IR for V in the power equation, you get another way to calculate power which is (IR)*I, which is I^2R. What it means is that if you have high current, your transmission losses are going to be the square of the current. Even if the resistance is low, the power lost in transmission can be big. By raising the voltage and lowering the current, the transmission losses are reduced.

There is a difference between the unit designation and the letter used in calculations. In calculations, V=Voltage, I=Current, and R=resistance. When showing a value, Volts=V, Amps=A, and Ohms=Ω (omega).

And IFF was used extensively in the Pacific. In the Aleutians ground controlled approach was also used to allow landing in zero visibility conditions. This required the plane to have extra equipment on board. My father was a photographer attached to different units at different times. He flew with B-29s at Saipan, B-25s in New Guinea and the Philippines. At the end of the war he was flying in B-25s out of Attu. He said the Aleutian B-25s were loaded down with a lot of extra electronics that wasn't on the 5th AF B-25s. The planes were very cramped inside.

Sometimes aircraft also had more than one radio and radios were large power hungry beasts back then.

Bill

"E" for voltage is what you might find in older books in the US. I remembered it from high school. Never made sense using E, so it's good they changed it to V. You will still find E in plenty of places, just call up this Google search (I hope this link works, it's from the results page):

https://www.google.com/webhp?source=search_app#hl=en&sclient=psy-ab&q=E%3DIR+ohms+law&oq=E%3DIR+ohms+law&aq=f&aqi=g-q1&aql=&gs_l=hp.3..0i22.24752.26525.1.30685.9.9.0.0.0.0.229.1542.0j8j1.9.0...0.0.mfP-m9Q9IEI&pbx=1&bav=on.2,or.r_gc.r_pw.r_cp.r_qf.,cf.osb&fp=ecb6a798695883bc&biw=1566&bih=907
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RE: OT - A/C Electrical systems

Post by pompack »

E stood for EMF which was electromotive force (measured in volts). The term goes back to the 1830's or thereabouts. Since it was measured in volts, eventually common usuage changed it to voltage.

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RE: OT - A/C Electrical systems

Post by witpqs »

ORIGINAL: pompack

E stood for EMF which was electromotive force (measured in volts). The term goes back to the 1830's or thereabouts. Since it was measured in volts, eventually common usuage changed it to voltage.
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RE: OT - A/C Electrical systems

Post by USSAmerica »

From 1988 until I left in 1997 (and I'm sure after that time) the USN taught and referred to voltage in formulas as E. E=I*R.

Besides, you can't have my very favorite formula in all of electronics if you use V instead of E. I love to eat P=I*E. [:D]
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RE: OT - A/C Electrical systems

Post by Reg »

ORIGINAL: pws1225

The higher the voltage, the lower the amperage (and associated wire size) to deliver the same amount of power.

Exactly. Ask anyone who has converted their pre-1966 VW Beetle from 6 Volts to 12 Volts. Everything just works better....

http://www.nls.net/mp/volks/htm/6v_12v.htm
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RE: OT - A/C Electrical systems

Post by JWE »

ORIGINAL: steamboateng
+1 JWE. But from you it may be another one of your silly cons!
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RE: OT - A/C Electrical systems

Post by steamboateng »

The worst I'd admit to, is using a terribly bad pun in a forum.
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RE: OT - A/C Electrical systems

Post by Capt Hornblower »

I don't know if anyone's still looking at this thread, but the E in E=IR stands for emf (which is electromotive force). E is the symbol most commonly used in physics because emf is understood to apply to all situations where an electric field exists, whether from the dynamic flow of electrons or from the static separation of electric charge of any sort. (V is used especially by electricians, who don't need to be formally trained in physics.)
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