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Hey everyone, I know I'm late to the chat, but I've got a picture of a real life Stuka siren that may help with our questions.View attachment 552327 View attachment 552328Please note that these are NOT my pictures, the photography is from a video from the "Fight to Fly Photography" Youtube channel. There's a museum in Washington state that is doing a Stuka restoration. The museum is called "Flying Heritage & Combat Armor Museum". They have a Youtube channel as well; I suggest looking into it for more information on the Stuka's build. Anyway, as you can see from my images above, it appears that the propeller has open slots on the side of it, which I'm assuming played a key role in causing the siren sound. As the plane dove, wind would drive the propellers, and while this was happening, the siren system would sound inside of the propellers. The sirens were obviously driven by the wind powered propellers. What I don't know is what exactly happened inside of the propellers that caused the Jericho trumpets to sound. The previous post that mentioned the different ports of an air raid siren is a pretty possible scenario as to how the Stuka sirens worked. Anyway, I hoped this helped, and I hope someone replies, because this is an incredibly fascinating subject that shouldn't be abandoned.
Interesting. Do you have any pictures you can share?This prop went for over 6900 Euro on ebay 3 years ago. It was sold by a woman who found it on an Austrian vintage car swap.
She was very kind to provide me with all possibly measures and photos. As I recently had bought an original Ju 87 Flugzeug-Handbuch Teil 12 D Sondereinbauten Heft 1 Lärmgerät for 400 Euro learning really everything about these sirens BUT how the sound was emitted, I hoped that the bottom of the vanes on this piece was moving freely from the prop showing other inner vanes but no. However, she sent me a Stuka photo where the vanes was covered with metal sheets and that must be taken as a proof for where the sound came from. The vanes on the real propellers had also square ends while they are rounded on the Kopiermuster and there can't me any other reason to make them square. The length of the vanes should, if they worked as whistles, produce a sound with the same pitch as the 32rd note above middle c on a piano and that seems too high compared with the wartime recordings I have heard but, I heard a Texan in a long free dive and as it sounded exactly as the movie Stukas so I might be listening for the wrong note. I'm sorry that I cant solve our problem but, at least, you know how much you have to cash up for a prop
I believe so but I have to find them.. The vanes are 85 mm long, 20 mm wide and 8 mm deep. The spinner is 120 mm cross over. A test spinner could be made from thatInteresting. Do you have any pictures you can share?
Thanks for the info. Those are for the two slots on either side of the propeller, correct? That definitely plays a part in making the siren, but I'm curious as to what's inside of the propellor that we can't see, because I doubt that it's only the vanes that create the siren sound.I believe so but I have to find them.. The vanes are 85 mm long, 20 mm wide and 8 mm deep. The spinner is 120 mm cross over. A test spinner could be made from that
Yes, it is the two slots. The seller said that the bottom of these are stiff and not movable, that would have been fine.Thanks for the info. Those are for the two slots on either side of the propeller, correct? That definitely plays a part in making the siren, but I'm curious as to what's inside of the propellor that we can't see, because I doubt that it's only the vanes that create the siren sound.
Ok. So I've considered that the siren gets its sound from air passing through the two vanes on the sides of the propellor, with the siren's pitch increasing as the propellor speeds up. If you look at the picture I posted of the siren fairings on the wrecked stuka, you can see that they are hollow and split down the middle. Do you think that's what makes the sound? The propellor vanes interacting with the inside of the trumpet mountings? Thank you for the info once again.Yes, it is the two slots. The seller said that the bottom of these are stiff and not movable, that would have been fine.
Do you have the pictures?This prop went for over 6900 Euro on ebay 3 years ago. It was sold by a woman who found it on an Austrian vintage car swap.
She was very kind to provide me with all possibly measures and photos. As I recently had bought an original Ju 87 Flugzeug-Handbuch Teil 12 D Sondereinbauten Heft 1 Lärmgerät for 400 Euro learning really everything about these sirens BUT how the sound was emitted, I hoped that the bottom of the vanes on this piece was moving freely from the prop showing other inner vanes but no. However, she sent me a Stuka photo where the vanes was covered with metal sheets and that must be taken as a proof for where the sound came from. The vanes on the real propellers had also square ends while they are rounded on the Kopiermuster and there can't me any other reason to make them square. The length of the vanes should, if they worked as whistles, produce a sound with the same pitch as the 32rd note above middle c on a piano and that seems too high compared with the wartime recordings I have heard but, I heard a Texan in a long free dive and as it sounded exactly as the movie Stukas so I might be listening for the wrong note. I'm sorry that I cant solve our problem but, at least, you know how much you have to cash up for a prop
Yes, now I found the ones presented on ebayDo you have the pictures?
Thx broYes, now I found the ones presented on ebayView attachment 581734View attachment 581735View attachment 581736View attachment 581737
Thank you very much!Yes, now I found the ones presented on ebayView attachment 581734View attachment 581735View attachment 581736View attachment 581737
I found the full diagram of the Stuka siren mechanisms on another Stuka thread @Interesting 2 posts!
According to the text on my manual, they planned to mount sirens on the 87 D too. The pictures I provide here are the most explaining from the book. Due to health issues I will sell it on ebay.com in about 1 month and want to warn you for buying it for finding any more clues about the sound emitting device than this thread and these pictures gives.
All the best!
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