How much information about a propeller from pictures of it?
ISTR that there was some spy case which involved selling secrets about US sub propellers (Walker?). How much useful information can be gleaned from examining a series of pictures of one given all the...
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The amount of information that can be gleaned is probably far less than the prosecutors will claim and far more than the defense attorney would claim. On the other hand, Walker was probably was...
View ArticleRe: How much information about a propeller from pictures of it?
[Ooops, internet explorer just hiccupped on me, so I'll have to try and rewrite my post.] Hi, In general I'd suspect that you could probably get things like diameter, number of blades and blade shape...
View ArticleRe: How much information about a propeller from pictures of it?
It's my understanding that what the Russians really lacked was the precision milling equipment used to make them. Until a Japanese company sold it to them, that is.
View ArticleRe: How much information about a propeller from pictures of it?
I think that you'd be able to get the pitch as well- or is that what you mean by rake and skew?Nevertheless, I'm still kind of surprised that they didn't just throw a tarp over the prop- it would only...
View ArticleRe: How much information about a propeller from pictures of it?
Perhaps the individual state of each observed propeller could give a clue of identity by 'unique' sonar signatures. Besides missing sound 'proofing' tiles etc.
View ArticleRe: How much information about a propeller from pictures of it?
DcSculler wrote:I think that you'd be able to get the pitch as well- or is that what you mean by rake and skew?Nevertheless, I'm still kind of surprised that they didn't just throw a tarp over the...
View ArticleRe: How much information about a propeller from pictures of it?
bgile wrote:It's my understanding that what the Russians really lacked was the precision milling equipment used to make them. Until a Japanese company sold it to them, that is.Toshiba may have sold...
View ArticleRe: How much information about a propeller from pictures of it?
bgile wrote:It's my understanding that what the Russians really lacked was the precision milling equipment used to make them. Until a Japanese company sold it to them, that is.Hi,I believe that there...
View ArticleRe: How much information about a propeller from pictures of it?
Now that the knowledge of blade rate and curved blades in well known, pictures give you little that's secret. The number of blades could be important to know for characterizing blade rates and noise,...
View ArticleRe: How much information about a propeller from pictures of it?
Enough that people with interesting propellers don't like you taking pictures of them.
View ArticleRe: How much information about a propeller from pictures of it?
The best thing is to build submarines with no propeller! From the Swiftsure class onwards ( 1973) the UK submarines had pumpjets. (Like the Virginia s have now)
View ArticleRe: How much information about a propeller from pictures of it?
Old RN wrote:The best thing is to build submarines with no propeller! From the Swiftsure class onwards ( 1973) the UK submarines had pumpjets. (Like the Virginia s have now)Hi Old RN,Does this mean...
View ArticleRe: How much information about a propeller from pictures of it?
Old RN wrote:The best thing is to build submarines with no propeller! From the Swiftsure class onwards ( 1973) the UK submarines had pumpjets. (Like the Virginia s have now)One could say they do have...
View ArticleRe: How much information about a propeller from pictures of it?
emc wrote:Old RN wrote:The best thing is to build submarines with no propeller! From the Swiftsure class onwards ( 1973) the UK submarines had pumpjets. (Like the Virginia s have now)One could say...
View ArticleRe: How much information about a propeller from pictures of it?
I am not sure of the Seawolf class but I don't think the los Angeles class had them. The inclusion of pump jets in the Virginia class is listed as one of their advances.
View ArticleRe: How much information about a propeller from pictures of it?
A pumpjet is, essentially, a propeller in a duct -- a fairly simple concept that has been around for a very long time. Pumpjets are widely used in tugboats. It appears that they were never used in...
View ArticleRe: How much information about a propeller from pictures of it?
We used to call the thing at the back of Swiftsure class a pumpjet, (HMS Superb 1978- 1980). We certainly had both fixed and moving elements in it. I think the difference between pumpjet and propulsor...
View ArticleRe: How much information about a propeller from pictures of it?
Old RN wrote: ... I think the difference between pumpjet and propulsor is in the eye of the beholder!This is precisely correct. In those days we stopped saying "propeller" and switched to the all...
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