Was this common practise .

THE_MASK · 02-19-10, 02:12 AM

Ragtag · 02-19-10, 02:13 AM

Yes, in calm weather they often used the persiscope to get higher up for better view.

Letum · 02-19-10, 02:16 AM

I have heard about it before.

Common? I don't know, but I would be surprised if it was standard practice. Certainly not when air strikes where a danger.

Every meter higher you stand gives you an extra few km viewing range, so it would be very useful.

GoldenRivet · 02-19-10, 02:23 AM

extend the periscope fully.

wait about 10 minutes

ALARM!!!!!

everyone leaves him hanging and dive to periscope depth leaving him right above the water.

Sailor Steve · 02-19-10, 11:08 AM

Quote:

Originally Posted by GoldenRivet

extend the periscope fully.

wait about 10 minutes

ALARM!!!!!

everyone leaves him hanging and dive to periscope depth leaving him right above the water.

Except for the part where an alarm initiates a full-flood crash dive, which leaves him about 50 meters underwater. Glug.

Heretic · 02-19-10, 11:20 AM

Here's a vid of the autogyro

Highbury · 02-19-10, 12:23 PM

Quote:

Originally Posted by Heretic

Here's a vid of the autogyro

Hey nice vid! I already posted that on Page 1

Highbury · 02-19-10, 02:33 AM

Quote:

Originally Posted by Letum

I have heard about it before.

Common? I don't know, but I would be surprised if it was standard practice. Certainly not when air strikes where a danger.

Every meter higher you stand gives you an extra few km viewing range, so it would be very useful.

Absolutely height gives you an advantage. That is why Crow's Nests were set set high up the masts in sailing ships, and why the Germans toyed with the Fa330 for U Boats.

I am sure climbing as high as you can was done often.

FIREWALL · 02-19-10, 02:39 AM

I'll bet he was their best swimmer too.

karamazovnew · 02-19-10, 04:27 AM

The actual formula for horizon distance during normal daytime is:

Max_Distance[miles]=2.08 * sqrt(Observer_Height[m])

This is based on the curvature of the earth AND the refractive index of air at sea level at a certain temperature and latitude.

By combining the vision fields of the observer and the target, the maximum distance at which the target mast can be seen is:

Max_Distance[miles] = 2.08 * (sqrt (Observer_Height [m]) + sqrt (Target_Height [m]))

Judging from the Type VII dimensions, the observer's eye must've been at around 5 meters:

Heigth = 9.60 m (31 ft 6 in)
Draft = 4.72 m
Railing Height = 1.4 m
Average man = 1.7 m

Eye Height = 9.6-4.72-1.4+1.7 = 5.18 m

Which gives us a 4.8 mile horizon distance (8800 meters).
Thus, a ship with a mast of 25 meters above water would be visible at 15.1 miles (28 kilometers!).

By climbing up on the periscope you gain 5 more meters on the observer height (let's say a total of 10 meters). So:

Which gives us a 6.6 mile horizon distance (12,225 meters).
And a ship with a mast of 25 meters above water would be visible at 17 miles (31.5 kilometers!).

Of course, the real situations were very different. To actually SEE something, let alone identify it properly, it would need to be much closer. What's important is that beyond 8 kilometers you wouldn't be able to see the waterline of ANY ship. Weather conditions, funnel smoke, lighting conditions, all have a major effect.

Letum · 02-19-10, 04:39 AM

You also have to bear in mind that the human eye is only good for one
arc minuet in ideal conditions. that means you will struggle to see
anything smaller than 3cm at a range of 100m.

At 10km you will struggle to see a 3m white object against a black
background. That's not good if you want to see a grey mast against
a hazy blue background from a moving boat, even if it is not obscured
against the curvature of the earth.

onelifecrisis · 02-19-10, 10:12 AM

Quote:

Originally Posted by sober

What the... where is that guy's head!?

Platapus · 02-19-10, 10:18 AM

Quote:

Originally Posted by onelifecrisis

What the... where is that guy's head!?

Under his hat?

Jimbuna · 02-19-10, 11:04 AM

Quote:

Originally Posted by FIREWALL

I'll bet he was their best swimmer too.

Quote:

Originally Posted by Platapus

Under his hat?

LOL

Didn't they do this in places like the Indian Ocean where there wasn't much air cover?

02-19-10, 02:12 AM	#1
THE_MASK Ace of the deep . Join Date: Jan 2006 Posts: 9,226 Downloads: 901 Uploads: 73	Was this common practise .

02-19-10, 02:13 AM	#2
Ragtag Seasoned Skipper Join Date: Jan 2002 Location: Oslo, Norway Posts: 654 Downloads: 163 Uploads: 0	Yes, in calm weather they often used the persiscope to get higher up for better view. __________________ Intel I7-7800x CPU. 16Gb G.skill DDR4 3600MHz. Asrock Taichi X299 mb Palit RTX 2080Ti. Fortron 1000W PSU. BenQ XR3501R LCD.

02-19-10, 02:16 AM	#3
Letum Navy Seal Join Date: Feb 2005 Location: York - UK Posts: 6,079 Downloads: 43 Uploads: 0	I have heard about it before. Common? I don't know, but I would be surprised if it was standard practice. Certainly not when air strikes where a danger. Every meter higher you stand gives you an extra few km viewing range, so it would be very useful. __________________

02-19-10, 02:23 AM	#4
GoldenRivet Subsim Aviator Join Date: Mar 2007 Location: Texas Posts: 8,726 Downloads: 146 Uploads: 0	extend the periscope fully. wait about 10 minutes ALARM!!!!! everyone leaves him hanging and dive to periscope depth leaving him right above the water. __________________

02-19-10, 11:20 AM	#6
Heretic Commodore Join Date: Mar 2005 Location: Nebraska Posts: 617 Downloads: 240 Uploads: 2	Here's a vid of the autogyro __________________ - heretic I enjoy drinking beer. MightyFine Crew Mod 1.2.1 - Updated 22 March MightyFine Less Annoying Footsteps Crew AI Scripting Information

02-19-10, 02:39 AM	#9
FIREWALL Eternal Patrol Join Date: Mar 2006 Location: CATALINA IS. SO . CAL USA Posts: 10,108 Downloads: 511 Uploads: 0	I'll bet he was their best swimmer too. __________________ RIP FIREWALL I Play GWX. Silent Hunter Who ??? Last edited by FIREWALL; 02-19-10 at 03:49 AM.

02-19-10, 04:27 AM	#10
karamazovnew The Old Man Join Date: Mar 2009 Location: Bucharest, Romania Posts: 1,403 Downloads: 151 Uploads: 0	The actual formula for horizon distance during normal daytime is: *Max_Distance[miles]=2.08 sqrt(Observer_Height[m]) This is based on the curvature of the earth AND the refractive index of air at sea level at a certain temperature and latitude. By combining the vision fields of the observer and the target, the maximum distance at which the target mast can be seen is: Max_Distance[miles] = 2.08 * (sqrt (Observer_Height [m]) + sqrt (Target_Height [m])) Judging from the Type VII dimensions, the observer's eye must've been at around 5 meters: Heigth = 9.60 m (31 ft 6 in) Draft = 4.72 m Railing Height = 1.4 m Average man = 1.7 m Eye Height = 9.6-4.72-1.4+1.7 = 5.18 m** Which gives us a 4.8 mile horizon distance (8800 meters). Thus, a ship with a mast of 25 meters above water would be visible at 15.1 miles (28 kilometers!). By climbing up on the periscope you gain 5 more meters on the observer height (let's say a total of 10 meters). So: Which gives us a 6.6 mile horizon distance (12,225 meters). And a ship with a mast of 25 meters above water would be visible at 17 miles (31.5 kilometers!). Of course, the real situations were very different. To actually SEE something, let alone identify it properly, it would need to be much closer. What's important is that beyond 8 kilometers you wouldn't be able to see the waterline of ANY ship. Weather conditions, funnel smoke, lighting conditions, all have a major effect.

02-19-10, 04:39 AM	#11
Letum Navy Seal Join Date: Feb 2005 Location: York - UK Posts: 6,079 Downloads: 43 Uploads: 0	You also have to bear in mind that the human eye is only good for one arc minuet in ideal conditions. that means you will struggle to see anything smaller than 3cm at a range of 100m. At 10km you will struggle to see a 3m white object against a black background. That's not good if you want to see a grey mast against a hazy blue background from a moving boat, even if it is not obscured against the curvature of the earth. __________________