South Korean Dolgarae class midget submarine.
First time seeing a double set of bowplanes Looks like they swing out like those on the Type 209.
First time seeing a double set of bowplanes Looks like they swing out like those on the Type 209.
-
Make it simple, make strong, make it work! -
Most interesting, I haven't seen anything like this before. On the french boat the forward most plane seems reasonable for surfacing but the rearward plane looks like it is very steep, almost like running into a wall ??Comment
-
Yes Bizarre to some of us. The South Korean subs are interesting and didn't know about them. Learned something new today!
The Dolgarae class midget submarine follows the German Type 209 approach to the same design problem of completely retracting the bow planes when not needed and extending only when needed. These are on a pivoting vertical axis, and the degree of up or down force is determined by the amount of rudder surface exposed into the flow of water over the hull.
The French system is same in purpose, but the French slide their planes slide out horizontally on tracks.
The Narwals are the French Navy's largest earlier postwar conventional powered subs. Where the British and Americans who had an abundance of submarines used large fleet submarines for their missions, the French had to resurrect their Submarine designs and followed their prewar practice of short, medium and long-range submarines. The Narvals where the French interpretation of the German Type XXI and where long-range subs for patrolling off their (then) far off colonies then (Indo China).
Here are photos of Espadon being restored and upkeep in St Nazzare in one of their famous U-boat pens where she is a museum. These configurations seem odd but the seem to work. These were used on the small hunter killer Arethuse subs too, but the mid-range subs Daphné class used always extended bow planes much like the German Type VII and IX boats.
You tube shows the German system best.
My 1/32 Argonaute completed by Bob Martin and his team. The 'up plane' is on port side top. Because of the long moment arm from the boats center of buoyancy the small planes far forward work quite effectively.
Espadon restoration work shows planes both sets extended (Port and starboard).
.
Last edited by Albacore 569; Yesterday, 12:36 PM.Comment
-
Maybe the designers wanted the force acting on the bow planes to be symmetrical and reduce any roll effect.Make it simple, make strong, make it work!Comment
-
There are a few more photos online of the Dolgarae class submarine SSM-053 at Seoul Battleship park which shows some more of the design features;
Also some photos of one on display in Busan
and finally a few photos of one underway in the 1980's
https://www.reddit.com/r/submarines/...eclass_midget/
Clearly the design took some inspiration from the German postwar SSK's including a rudder/rear plane arrangement similar to the Type 206 and a sail similar to the Type 240 (Modification of the salvaged Type XXIII Hai and Hecht submarines used by the Bundesmarine in the 1960's)Comment
-
Also on r/submarines there is a nice background explanation of these mussel shaped foreplanes by Vepr157
https://www.reddit.com/r/submarines/...in_bow_planes/
The associated drawings of the Type 205 bow plane arrangement & extracts from Ulrich Gabler's book on submarine design can be found at the following links
Comment
Comment