No TDC on Suger Boats

[John Channing]

I believe they had a circular slide rule called an "Is/Was" or "Banjo".

JCC

[Jungman]

Thanks for the info. You know, it maybe cool to try to reproduce those tables and banjo thingy to do it the old fasion way, no modern calculator.

One other question, in SH3 someone did have a way to determine speed by listing to the number of revolution of the screws via hydrophone. It was bit hard to use depending on what ship you were listening too. iRL you did not know this ship's ID.

If the hydrophone does not work at PD, you can still get range via an active sonar ping to the target. I am surprised that a warship's passive sonar guy did not hear that. Is that realistic> pinging the target to get range via active sonar at PD? without spooking the warship.

Modern ships/subs would hear that immediately. I guess in the old days, it was hard to hear that one or two pings unless they got real lucky.

[WFGood]

I have the files. They may not reproduce very well, but I can try and post it to my personal webpage and let people look at it and take what they will.

[Jungman]

Originally Posted by WFGood

I have the files. They may not reproduce very well, but I can try and post it to my personal webpage and let people look at it and take what they will.

Sure. It would be neat for a reference, a real life mod sort of.

It would be nice to reproduce what they really used, if it can be used in game. As the one poster said, they use to count screws to get speed. We cannot do that in game, reliabley.

The equation above, for a specific torpedo type (let say Mark 14 slow at 31 knots) could have a circle wheel were one turns it to the calculated target speed, to match up the calculated AOB, then read off toward the center the given degree offset you would need to fire from your present given target bearing you are observing. OP method.

This does not need the range...it is taken into account when determining the speed/plot method, which I like to do.

[MadMike]

I believe "War in the Boats" by Ruhe mentions using the "banjo" (S-class). Will check in the local library tomorrow...

Yours, Mike

[don1reed]

Doubting Thomas'

I posted this in June 2006 on the SHIII forum:

http://www.subsim.com/radioroom/showthread.php?t=94608


Yes, those WWII sub/uboat skippers (all nationalities, btw) were smarter than we give them credit for. Some of those guys became scientists, architects, & engineers after the war, I'm told

...and would you believe, the entire USA Lunar project of placing men on the moon (1969) was completed before the era of pocket calculators...hmmmm.

...someone must have been using a sliderule.

Cheers,

[don1reed]

Here is how the Arcsin (( 13/31 ) sin 80° ) is completed using a dimestore sliderule.

[jmr]

Originally Posted by don1reed

Doubting Thomas'

I posted this in June 2006 on the SHIII forum:

http://www.subsim.com/radioroom/showthread.php?t=94608

don1reed, are you whiz wheel files still available for download? Unfortunately the download links in that thread you listed are dead.

Thanks!

[Sailor Steve]

Aw, man, I read the title and thought "Really? They don't have them in the game? COOL!"

It isn't even April first anymore; it wasn't even a joke...but it got me anyway! :rotfl: