Extended use of full engine power

[Leandros]

Originally Posted by mikey117us

this is the Translated U-Boat Standing order No. 29
Permanent Order No. 29.

Full speed of main Diesel engines at sea.

During any enemy operation, cruise at full speed with both Diesels every four days for half an hour, while observing cruising times in order to detect signs of engine trouble immediately and to safeguard the full use of the boats fighting capacity when opportunity arises.

C.C. U-boats Top Secret 02809/FS of 28/1/43.
So in Reality Full Speed was War Emergency Power and AK+1 (we can't do in sh3) is Flank Speed with the Electric Motors and Batteries Tied In. And Running at full speed was necessary in the parameters above. But Long Term Running was a recipe for a Broken Boat.

Diesels + electric? That ought to be a nice modding mission.....

As for permanent order no. 29 I should think it a particularly good idea to run the diesels up at intervals if run for longer periods at economic cruise (langsam fahrt). Diesels do have a tendency to "dirty up". One experience the same in diesel cars which have been "lady-driven".

If I run the diesels on my old minesweeper on idle for long periods it starts to emit a sort of oily "drops" from the funnel. Goes away when pressing it somewhat.

Fred

[GJO]

Originally Posted by Leandros

Diesels + electric? That ought to be a nice modding mission.....

As for permanent order no. 29 I should think it a particularly good idea to run the diesels up at intervals if run for longer periods at economic cruise (langsam fahrt). Diesels do have a tendency to "dirty up". One experience the same in diesel cars which have been "lady-driven".

If I run the diesels on my old minesweeper on idle for long periods it starts to emit a sort of oily "drops" from the funnel. Goes away when pressing it somewhat.

Fred

Thank you Fred - you have provided an answer to a real life situation that we have had for some time. The old Kelvin diesel on our boat does just that after extended inland waterway runs at >250 rpm (I often get covered in small droplets of black oil from the diesel exhaust!) and it needs a real blast at 500+ rpm every now and then to clear it.
I believe that similar orders about the management of diesel engines were issued to German tank crews.

[Leandros]

Originally Posted by GJO

Thank you Fred - you have provided an answer to a real life situation that we have had for some time. The old Kelvin diesel on our boat does just that after extended inland waterway runs at >250 rpm (I often get covered in small droplets of black oil from the diesel exhaust!) and it needs a real blast at 500+ rpm every now and then to clear it.
I believe that similar orders about the management of diesel engines were issued to German tank crews.

Another issue in this context might be the visibility at sea of the exhaust fumes.

Fred

[GJO]

Originally Posted by Leandros

Another issue in this context might be the visibility of the exhaust fumes.

Fred

Indeed, according to my father (who was in the Royal Artillery HQ section during the Normandy landings) that was how they spotted the German tanks - it soon became known that (in his words) "The 'Jerry' would punctually start all their tank engines at the same time every morning and run them fast initially sending up clouds of dirty smoke and this gave the gunners the range and target" - the range was calculated with a stopwatch by comparing the time elapsed between sighting the initial exhaust smoke and then hearing the noise. Possibly a case where the renowned German punctuality was not such a positive asset . . .