Shipbucket

Very nice!!

This might be my best drawing so far, I only used 3 weeks on this

Let us jump forward to the 60's and Norway have received a new class of frigates in 1966-67, the so called Oslo class ASW and escort frigate, build around the Terne 3 Mk8 ASW weapon system

Oslo Class
submariners nightmare!



Terne 3 Mk8 ASW rocket thrower launcher:
- range of 425-1600 meter. (as an old veteran captain proclaimed to me once, if we had it on sonar, anything within 1600 meter, was going to get hit, but anything under 800 meter will be hit hard. But if you was unlucky to get closer then 450 meter, we could place depth chargers down the hatch! If you was still around, we had no problem to deliver some barrel of fun!)
- dropped it's 6 depth chargers in and oval circle, with a 18 meter distance between charges.
- The system wasn't supposed to destroy the target, but severely damage the target and cause flooding or force it up to surface. (you must be mental to enjoy 6 x 50kg warhead detonating all around you! poop poop)
- The Terne 3 sonar system had an estimated range of 14-15 km, official. When the sonar got it target, it had no problem to track it for long, even a little above it's range.

The Sonar system was from the late 70's to early 80's fast surpassed by newer technology, even with some electronic upgrade, thus Oslo class received towed sonar to compensate for the problem.


Modified Dealey class hull, modified to better handle the Norwegian sea:
- heightened hull and bow, with more flare.
- harder shine on stern to give more lift aft and better sea and speed capability.
- Strengthened hull, to handle Norwegian winter with ice on the water, can handle thin ice.
- deeper hull due to heavier ship.
- The entire class had 2 type of propellers to chose between, one for a more economical and silent drive, the other one was for "speed"
- officially the class was capable to 25+ knots (limitations was the excuse), but from sources I have in the Navy, Oslo class could easily get pass 28 knots. (Note: F303 was once clocked to over 30 knots. People that saw her, tough at first it was an MTB coming, due to the speed)

Very nice work and 3 weeks of effort doesn't seem too bad at all for a 4-view drawing like this!
Nice to see the Oslo class getting an updated drawing, very nice work.

With the two propeller options, I guess that entailed a drydocking spell to swap them over, was it ever done regularly in service?

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Thanks
not from what I have heard, but I expect they did a changeover when there was a need for it.
I have seen propeller change on boats at dock with help of divers and some difficulty, whether they was capable to do so, I have no idea. but if they had some sort of equipment..

Fantastic drawings! Nice to see more 4-5 views. And 3 weeks is indeed not too bad.

As preparations for the 1960 Fleet Plan, the main naval base was shifted from Karljohansvern at Horten to the newly constructed Haakonsvern outside Bergen. This entailed building a whole new base from scratch, and included a mountain drydock on the base that was large enough to accomodate the Oslo-class frigates for routine maintenance. This meant that the frigates could be docked very quickly and easily if needed (and there wasn't a ship already in dock being maintained), without having to go to a shipyard.

In the 2000s, the mountain drydock was upgraded and extended to accomodate the Fridtjof Nansen-class frigates, and is still in daily use to this day.