Picture of the day

bearhunter said:
This photograph captures German soldiers operating a sound detector during World War II, a device used to locate aircraft by detecting their sonic booms. The equipment, developed in the 1930s, was part of Germany's early anti-aircraft defense systems before the advent of radar.
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Bit early for sonic booms, no? :) Obsolete mid-war, years before Yeager and the X1 made the first aircraft generated sonic boom...
 

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    This photograph captures German soldiers operating a sound detector during World War II, a device used to locate aircraft by detecting their sonic booms. The equipment, developed in the 1930s, was part of Germany's early anti-aircraft defense systems before the advent of radar.


    rarehistoricalphotos.com
    Aircraft Detection Before Radar: Old Photos from 1917-1940 - Rare ...

    reddit.com
    Sound location equipment in Germany, 1939. It was used to determine the ...
 
bearhunter said:

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    This photograph captures German soldiers operating a sound detector during World War II, a device used to locate aircraft by detecting their sonic booms. The equipment, developed in the 1930s, was part of Germany's early anti-aircraft defense systems before the advent of radar.


    rarehistoricalphotos.com
    Aircraft Detection Before Radar: Old Photos from 1917-1940 - Rare ...

    reddit.com
    Sound location equipment in Germany, 1939. It was used to determine the ...
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Which aircraft were capable of creating a sonic boom in 1939? There was sound detection devices used by both sides to listen for aircraft noise in ww2. Not sonic booms though. - dan
 
bearhunter said:

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    This photograph captures German soldiers operating a sound detector during World War II, a device used to locate aircraft by detecting their sonic booms. The equipment, developed in the 1930s, was part of Germany's early anti-aircraft defense systems before the advent of radar.


    rarehistoricalphotos.com
    Aircraft Detection Before Radar: Old Photos from 1917-1940 - Rare ...

    reddit.com
    Sound location equipment in Germany, 1939. It was used to determine the ...
Click to expand...
bearhunter, you OK? This kinda reads like you've had a stroke and are relying on AI to respond to threads... Very much NOT in character.

You're a valuable part of this thread, what with your experience and all. This ain't like you. Got me worried here.
 
I'm fine, I was just trying to post the Co Pilot link to the photo, which also shows several different types of listening devices for aircraft detection. Didn't come through with everything.

Just highlight and click on search the web.

Dozens of interesting pics of this device and several others. They were very serious about using these for aircraft detection and put a lot of resources into developing them.

https://www.bing.com/images/search?...ck=4B8C124E870465F3810112C0F092B799&idpp=serp
 
I'd heard the Harvards sounded like they do because of a reduction gear between the driveshaft and the prop. Could well be bullsh!t, but that's what I heard.

I recall an announcer at an airshow (wish they'd say less) talking about a flight of four Harvards going over. "You'll note that four Harvards are no noiser than a single Harvard. That's because one Harvard makes all the noise there is..."

For a truly loud prop, I believe the record is held by the XF-84H, nicknamed the "Thunderscreech".

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Not unattractive, but just horrible in most practical regards, the foremost sin being the noise generated by the prop tips going supersonic. Plenty of stories online about it if you're interested.
 
Here's one I'd never heard of, and it was a legit RAF aircraft. The de Havilland Don:
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Looks like a British Sturmovik. Not DH's most successful work. This from Wikipedia:

The Don was designed to meet Air Ministry Specification T.6/36 for a multi-role trainer and was a single-engined monoplane of wooden stressed-skin construction. The DH.93 Don was intended to be a trainer for pilots and radio operators, and as a gunnery trainer, the gunnery requirement involved the mounting of a dorsal gun turret. Student pilot and instructor sat side by side up front, while accommodation for a trainee WT (radio) operator and the turret gunner was behind in the cabin.

The prototype with test marks E-3 (later military serial number L2387) first flew on 18 June 1937 and was transferred to RAF Martlesham Heath for official evaluation. In the course of the trials, more equipment was added which increased the weight, and as a result, in an attempt to reduce weight, the dorsal turret was removed. The aircraft was also modified with small auxiliary fins fitted beneath the tailplane.

Despite the changes incorporated from the fifth aircraft, the type was deemed not suitable for training and the original order for 250 aircraft was reduced to only 50 aircraft, 20 of which were delivered as engineless airframes for ground training. The remaining aircraft served as communications and liaison aircraft, serving with No. 24 Sqn and numerous RAF Station Flights throughout the UK until early 1939, but all were grounded for use as instructional airframes in March 1939.
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The de-turreted version is quite pretty. Very sleek.

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That de Havilland tail always appeals to me. A lovely shape.
 
Dark Alley Dan said:
I'd heard the Harvards sounded like they do because of a reduction gear between the driveshaft and the prop. Could well be bullsh!t, but that's what I heard.

I recall an announcer at an airshow (wish they'd say less) talking about a flight of four Harvards going over. "You'll note that four Harvards are no noiser than a single Harvard. That's because one Harvard makes all the noise there is..."

For a truly loud prop, I believe the record is held by the XF-84H, nicknamed the "Thunderscreech".

proxy-image


proxy-image


Not unattractive, but just horrible in most practical regards, the foremost sin being the noise generated by the prop tips going supersonic. Plenty of stories online about it if you're interested.
Click to expand...
Just wait until the new "elbow up" Canadian demonstration team comes thundering across your air-show flight line...that auta be a thriller!!! Think I'll dub them "The Albatross-Birds" or "goony -birds" if you prefer. This could actually be compared to driving an actual thump-thump "muscle car" to a "bzzzz rice burner" the boys are forced to drive now.
 
Dark Alley Dan said:
It'd take a talented model maker to get that look with an airbrush. TONS of character in those old ladies.
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well that's one way of describing hydraulic leaks.... "tons of character", 38 and 40 year old survivors... of a single purchase

Khan't-Eh-Duh continues flying aircraft on the front line that are older than the Soviet survivors that Ukraine had retired, cannibalized and reactivated in the dispirit days of 2022 and now is in the process of replacing...
 
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