Type 45 destroyers face engine refit already.
Discussion
Looking at that I would assume the issue related to the noise load from the propulsion inverters being enough to trip the gensets when close to their plated capacity.
PWM's at that size can be very noisy and have some interesting electrical effects, fine if you have a fair sized buffer behind them, but I guess two gensets without the GT's running may well not be enough.
PWM's at that size can be very noisy and have some interesting electrical effects, fine if you have a fair sized buffer behind them, but I guess two gensets without the GT's running may well not be enough.
That does surprise me; great effort was made to separate propulsion from hotel loads on T23 because the power control electronics sent awful harmonics back up the power line, which you don't want in the power supply to your computers and radars, so they fitted motor generator units. Have they ended up with a similar problem on T45?
Ayahuasca said:
Story in the Times suggests that Bae preferred the tried and tested American turbines from the get-go but were overridden by political considerations to use RR engines by Geoff Hoon, the defence sec at the time.
Any truth?
yes, but it's not the GT's that are the problem is it?Any truth?
hidetheelephants said:
That does surprise me; great effort was made to separate propulsion from hotel loads on T23 because the power control electronics sent awful harmonics back up the power line, which you don't want in the power supply to your computers and radars, so they fitted motor generator units. Have they ended up with a similar problem on T45?
Which would be the opposite of one of the main benefits in the 45 design of having a single motive power source (albeit N+N).Smiler. said:
Which would be the opposite of one of the main benefits in the 45 design of having a single motive power source (albeit N+N).
How would it do this? The motor generators just provide separation from power electronic-induced harmonics, the motive power would remain as it is.Scuffers said:
Ayahuasca said:
Story in the Times suggests that Bae preferred the tried and tested American turbines from the get-go but were overridden by political considerations to use RR engines by Geoff Hoon, the defence sec at the time.
Any truth?
yes, but it's not the GT's that are the problem is it?Any truth?
In 1963 I joined a Cruiser HMS Lion, laid down in 1946, we sailed the Far East, Australia, Middle East. Did the temperature affect the engines, no, what is going on.
Engineers, get this. My dad (RIP) always told me in the army you always broke step when marching over a bridge because it would affect the structure, and the bridge would sway.
When they built the Millennium bridge in London, they had to close it as it swayed due to "Un-intentional schronised walking",
How come they knew in WW2 about marching over a bridge in step would cause the bridge to,sway and the ginger beers didn't know it when they built the Millennium Bridge.
Engineers, get this. My dad (RIP) always told me in the army you always broke step when marching over a bridge because it would affect the structure, and the bridge would sway.
When they built the Millennium bridge in London, they had to close it as it swayed due to "Un-intentional schronised walking",
How come they knew in WW2 about marching over a bridge in step would cause the bridge to,sway and the ginger beers didn't know it when they built the Millennium Bridge.
Ayahuasca said:
If our destroyers are all in port awaiting repair, and our carriers are not yet built, and half of our Astute class submarines have been crashed, what exactly is defending our sea lanes at the moment?
The article is low on detail, and says one of them is in for a families day. That doesn't mesn its in for repair. That means its in to let families come on board for the day, and will probably sail. Of all the families days I did, we only didn't sail once, and that was due to bad weather.
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