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4th Apr 2019, 14:34
Replies: 22
Views: 3,362
Posted By Recc

I couldn't say, but all the people who are in a...

I couldn't say, but all the people who are in a place to track the debris seem to think that at least some of the debris has an apogee higher than the ISS. I would imagine that the risk of a...
4th Apr 2019, 14:01
Replies: 22
Views: 3,362
Posted By Recc

Basic orbital mechanics. You cannot raise the...

Basic orbital mechanics. You cannot raise the perigee of an orbiting body by giving it additional velocity at perigee; you can only change its apogee or inclination. Similarly, for a body in a...
4th Apr 2019, 10:10
Replies: 22
Views: 3,362
Posted By Recc

Though worth bearing in mind that even in the...

Though worth bearing in mind that even in the worst case scenario, the debris cannot have a perigee that is higher than the impact point of 280km. Somewhat irresponsible, but not a problem that will...
Forum: Jet Blast
12th Sep 2018, 12:54
Replies: 3,193
Views: 305,053
Posted By Recc

The announcement by Putin is actually very...

The announcement by Putin is actually very significant. It means that all of the '3rd party' conspiracy theories are off the table. If the Russian state presents these two as innocent bystanders,...
Forum: Jet Blast
6th Sep 2018, 12:32
Replies: 3,193
Views: 305,053
Posted By Recc

That description certainly fits with other...

That description certainly fits with other examples of Russian military/ military intelligence operations over recent years. That said, 'inept' is probably the wrong word to use. 'Grossly reckless'...
Forum: Jet Blast
5th Sep 2018, 20:46
Replies: 3,193
Views: 305,053
Posted By Recc

No you wouldn't. The basic rule of constructing...

No you wouldn't. The basic rule of constructing effective cover stories is always to change as little as you possibly can. Aside from the fact that they are able to issue a genuine Russian...
Forum: Jet Blast
5th Sep 2018, 20:18
Replies: 3,193
Views: 305,053
Posted By Recc

Please don't insult our intelligence. ...

Please don't insult our intelligence. Constructing a plausible cover using the apparatus of a nation state's intelligence services is trivial; it is a large part of their routine work and it would...
Forum: Jet Blast
5th Sep 2018, 15:43
Replies: 3,193
Views: 305,053
Posted By Recc

Use your imagination. A foreign intelligence...

Use your imagination. A foreign intelligence officer (or agent) would be given decent cover prior to any sort of job (particularly one overseas). There are any number of ways in which UK...
Forum: Jet Blast
16th Aug 2018, 15:14
Replies: 51
Views: 2,830
Posted By Recc

The purpose of A-levels is not to allow Oxbridge...

The purpose of A-levels is not to allow Oxbridge to easily choose who gets a place; that would be a waste of an exam as most students do not go to Oxbridge. If you are going to have a finite number...
23rd May 2018, 12:48
Replies: 277
Views: 54,973
Posted By Recc

That is at least 20 years out of date. It used to...

That is at least 20 years out of date. It used to be the case that mayday was reserved for danger to vessels only, but under SOLAS and UK law (The Merchant Shipping (Distress Signals and Prevention...
Forum: Jet Blast
21st Sep 2017, 09:36
Replies: 235
Views: 37,723
Posted By Recc

I don't know about military systems, but civilian...

I don't know about military systems, but civilian class A sets can definitely operate in receive only mode, and consumer grade AIS receivers can be had for about £100. I would be extremely surprised...
Forum: Jet Blast
26th Aug 2017, 10:11
Replies: 235
Views: 37,723
Posted By Recc

Separate sections of the COLREGS apply in limited...

Separate sections of the COLREGS apply in limited visibility, and the way you react to other ships changes. In good visibility you have to make visual contact in order to see shapes and lights and...
Forum: Jet Blast
21st Aug 2017, 17:45
Replies: 235
Views: 37,723
Posted By Recc

Completely agree on all those points. It is good...

Completely agree on all those points. It is good manners to plan a crossing such that you won't get in anybody's way and for some classes of vessel it is the law. However all of that applies to a...
Forum: Jet Blast
21st Aug 2017, 16:38
Replies: 235
Views: 37,723
Posted By Recc

A TSS is not like a road where ships have lanes...

A TSS is not like a road where ships have lanes that they can occupy. All it is is a method of separating traffic moving in opposite directions in regions where traffic density is high. The purpose...
Forum: Jet Blast
21st Aug 2017, 16:12
Replies: 235
Views: 37,723
Posted By Recc

The damage is entirely consistent with a 90...

The damage is entirely consistent with a 90 degree crossing (as mandated in rule 10). Rule 10 is equally clear (in part a) that all of the usual sailing and steering rules apply when you are using a...
Forum: Jet Blast
21st Aug 2017, 14:55
Replies: 235
Views: 37,723
Posted By Recc

It looks like it, but given the time-scales, I...

It looks like it, but given the time-scales, I suspect a lot of the deceleration was "assisted". It is also clear that there is another ship close on their starboard quarter when this is happening,...
Forum: Jet Blast
21st Aug 2017, 14:20
Replies: 235
Views: 37,723
Posted By Recc

The AIS track (of the merchant vessel only) has...

The AIS track (of the merchant vessel only) has been posted on youtube and is quite interesting. You can see that it happened in a TSS with a relatively high density of traffic.

Given that this...
Forum: Jet Blast
21st Aug 2017, 13:56
Replies: 235
Views: 37,723
Posted By Recc

This video purports to show the AIS track of the...

This video purports to show the AIS track of the merchant ship before and during the collision. The US warship has apparently got the AIS turned off (as is their right).

Two points:
1. The...
Forum: Jet Blast
21st Aug 2017, 12:16
Replies: 235
Views: 37,723
Posted By Recc

Broadly similar, but the starting position (for...

Broadly similar, but the starting position (for apportioning blame) is that a collision requires a fault by both parties. Obviously there are exceptions to that, but as a general rule it is useful,...
Forum: Jet Blast
21st Aug 2017, 11:41
Replies: 235
Views: 37,723
Posted By Recc

That seems a reasonable conclusion, but we don't...

That seems a reasonable conclusion, but we don't know if the warship was manoeuvring at the time. Also, the COLREGS state that when it becomes apparent to the stand on vessel that action by the give...
2nd Nov 2014, 21:36
Replies: 1,644
Views: 2,021,836
Posted By Recc

They are not performing an exercise in an...

They are not performing an exercise in an undergraduate stats class; they are interested in what caused a single instance (namely the downing of an airliner over Ukraine 4 months ago. The...
9th May 2014, 13:33
Replies: 11,824
Views: 21,372,417
Posted By Recc

True, but I wasn't meaning to suggest that it was...

True, but I wasn't meaning to suggest that it was this particular model; it was just an example of the kind of technology that was out there. The basic model (for example) comes with a factory set...
9th May 2014, 12:22
Replies: 11,824
Views: 21,372,417
Posted By Recc

From the paper linked in the article: "We...

From the paper linked in the article:

"We developed the RATS to track the model V22P acoustic transmitter [...] which is specified to transmit a 36-kHz “ping” at 165 dB once every 700–1100 ms. The...
11th Apr 2014, 11:58
Replies: 11,824
Views: 21,372,417
Posted By Recc

Unless she has a very long anchor rode then she...

Unless she has a very long anchor rode then she is certainly underway. There is no AIS navigation status code for 'stopped', so presumably that is the website filling in the details from the SOG...
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