AMP - Accurate Model Parts

SEA => SUBS: Uboats => TYPE VII => Topic started by: Rokket on 05 Jul , 2009, 01:48

Title: Periscope Spirals
Post by: Rokket on 05 Jul , 2009, 01:48

I found this interesting..while doing some research on the Colins class sub, I found that there was a problem with the periscopes originally:

"The first was that they were not streamlined; raising a periscope while moving would create vibrations and water turbulence that could shake the entire submarine.[91] As with many elements of the submarine, there were disagreements as to who was responsible for the problem.[91] It was solved by fixing a spiral wrap around the head of each periscope, which redirected the water flow around."

The spirals on the Type VII - I think they've been referred to as "strengtheners" - never understood what they were or how they worked, but maybe (just maybe) they were for the above... ??? either way, interesting.

Title: Re: Periscope Spirals
Post by: Bad Karma on 05 Jul , 2009, 03:05

I can`t remember where this article came from,but it says at all.

(http://img443.imageshack.us/img443/9350/periscoop.th.png) (http://img443.imageshack.us/my.php?image=periscoop.png)(http://img194.imageshack.us/img194/4316/2005914216133225.th.jpg) (http://img194.imageshack.us/my.php?image=2005914216133225.jpg)


 ;) ;) ;) ;) ;) ;)

Title: Re: Periscope Spirals
Post by: Rokket on 05 Jul , 2009, 06:12

wow, thanks mate! Cool in one way, bad in another - 50-60 years later, no one learned from history! GRRRR! Why don't we learn and remember?!!!

Title: Re: Periscope Spirals
Post by: Bad Karma on 05 Jul , 2009, 07:30

A few months ago someone ask the same question on another forum about these wires,
back then I made a scan of this article,well  :-[ :-[ :-[ :-[ :-[ :-[ :-[ :-[ :-[ :-[ :-[ :-[ :-[ :-[ :-[ :-[ :-[I had to look it up where this came from.

It comes from the book ''ubootwaffe,marine-kleinkampfverbande 1939-1945''(Waldemar Trojca) page 54.

Title: Re: Periscope Spirals
Post by: Rokket on 07 Jul , 2009, 06:15

ahhhh.  It's interesting, I can't get over the point that modern sub designers HAVENT LEARNED! weird huh?  Bu thanks for the info, it was driving me crazy (I know, shirt drive)

Title: Re: Periscope Spirals
Post by: Pat on 04 Feb , 2010, 06:39

Funny that sub designers haven't learned but automobile designers have.

Have you noticed the same sort of spiral on many car radio antennas these days?

Title: Re: Periscope Spirals
Post by: Jan on 04 Feb , 2010, 10:35

Hehe...right now i`m thinking about putting a spiral around my car-antenna, too ;D

Title: Re: Periscope Spirals
Post by: Rokket on 05 Feb , 2010, 16:39

ahh, interesting!