Abnormal Ascent During O’Higgins Sea Trials
(Source: DCN; dated Jan. 12, web-posted Jan. 19, 2005)
PARIS — On 1st November 2004 the O’Higgins, the first submarine of the new Scorpene type and the first of two for the Chilean Navy, was undergoing tests off Lorient, France.
One test dive resulted in a so-called “falling leaf” ascent, a well-known physical phenomenon to which all submarine designs are susceptible under certain conditions. This abnormal ascent occurred under test conditions designed specifically to explore the submarine’s operating envelope.
Overall, the test results confirm the submarine’s excellent seakeeping.
The O’Higgins is proceeding with sea trials as originally planned to the complete satisfaction of partners DCN and Izar and their customers, the Chilean Navy.
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-> Does anyone know what exactly is this “falling leaf” ascent?
By: Wanshan - 24th January 2005 at 01:04
You mean, descend w/o propulsion and sort of rocking to and thro (by the way, is it back-forward or left-right?)
By: Severodvinsk - 23rd January 2005 at 13:23
C’est en français mon ami, c’est pas clair pour le plus grand part de la peuple ici.
But it’s quite litterally the same as the other article.
I think a falling leaf is just putting your ballast tanks full, moving straight down (no propulsion),to test the limits. But instead of going straight down the submarine is shaken from front to back, like a falling leaf…
Just an idea though…
By: Charlie Echo - 23rd January 2005 at 13:07
Same from DCN (manufacturer):
Sous-marin de type Scorpène « O’Higgins » : point sur les essais
Paris, le 12 janvier 2005
Le phénomène dit de remontée en feuille morte arrivé le 1er novembre sur le sous-marin O’Higgins pendant ses essais est un phénomène physique bien connu, prévisible, sur tous les sous-marins dans le monde.
Il est intervenu dans les conditions limites d’essais dans lesquelles le sous marin évoluait à ce moment-là. A cette occasion le sous-marin O’Higgins, premier du type Scorpène, a confirmé son excellent comportement à la mer.
Il poursuit actuellement ses essais, conformément au planning convenu et à l’entière satisfaction de DCN et son partenaire IZAR, et de notre client la marine chilienne.
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January 23, 2005 at 1:07 pm