ypu are perhaps pointing to Knud Rasmussen class patrol vessels

A diplacment of 1700ton
Oh, really? I think not.
The first of the three frigates, F361 IVER HUITFELDT, is here seen under construction in Lindø's Dock 1 at the end of January 2009.
(Photo: Danish Defense Acquisition and Logistics Organization)
Danish Naval Projects - Patrol Frigate - Iver Huitfeld Class - Patrol Ship - Projekt Patruljeskib - NATO Comparisons - CASR - Canadian American Strategic Review - Danish Ships - Standard Flex - Frigate Project - Absalon Class - SCSC - Single Class -
New Patrol Ships (2006)
Frigate building in progress
IVER HUITFELDT Class (2012- ), frigates
Iver Huitfeldt - Ny stor fregat til SOK
http://www.amiinter.com/samples/denmark/DA1501.html
Type: Patruljeskib / Patrol Ship (frigate)
Number of units: 3
Years of Construction: 2007-2011
Dimensions:
Length: 138 m
Beam: 20 m
Draught: 6 m
Displacement: 6,200 tons
Complement: Around 100 men (accomodation for 160)
Armament:
1 - 127 mm Gun M/02
1-2 - 76 mm Gun M/85
1-2 - 35 mm Gun M/04 (CIWS)
x - 12,7 mm Heavy Machine Guns
16 - HARPOON SSM Block II
24 - Evolved Sea Sparrow (ESSM) SAM's
1 - Mk 41 Multi missile launcher with 32 cells for long range SAM's etc.
2x2 - Stinger SAM Lv M/93
2x2 - Anti Submarine Torpedo Launchers (MU-90)
Speed: 28 knots
Range: 9,000 nautical miles at 15 knots
BY COMPARISON, THE RASMUSSEN:
KNUD RASMUSSEN (2008- ), Offshore Patrol Vessel
Offshore patrol vessel
Built by: Karstensens Ship Yacht A/S, Skagen (The hull is built at the Polish Stocznia Pólnocna (Northern Shipyard) in Gdansk)
Design: Karstensens Ship Yacht A/S in cooperation with the Danish Defense Acquisition and Logistics Organization
Laid down: November 21, 2005
Launched: October 19, 2006
Commissioned: February 18, 2008
Decommissioned: In service
Pennant Number: P570
Displacement: 1,720 tons
Dimensions:
Length: (LOA) 71.80 m (LWL) 61.00 m
Beam: 14.60 m
Draught: 4.95 m
Complement: 18 men (lodging capacity for 43)
Propulsion:
2 ea B&W ALPHA 8L27/28 á 2.720 kW v/800 rpm
1 ea Propeller (CP)
RENK reduction gear "Twin in/single out"
Range: 3,000 nautical miles
Armament: 2 ea 12,7 mm Heavy Machine Guns M/01 LvSa
The vessel has two flex container positions, one in the front and one in the aft, enabling it to carry a number of flexible systems, must of all one 76 mm Gun Mk M/85 LvSa on the foredeck.
Additional space for: 1 ea SAR/Landing Crafts of the LCP Class
Speed: 17 knots