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Challenger class corvette
http://67.205.157.234/forums/viewtopic.php?f=18&t=4187		 Page 1 of 2
Author:  SilentRunning [ April 20th, 2013, 10:11 pm ]
Post subject:  Challenger class corvette
Right I'm back with another new design, this one based on one of the concepts for the Gowind Combat Corvette with a few tweaks here and there. Armament consists of an Oto Melara SR 76mm gun, cold launch silos for 24 CAMM (2 x 3 quad packed), two quadruple launchers for Naval Strike Missile and two DS30M 30mm guns. A single helicopter of Lynx Wildcat size can be hangered on board; alternatively UAVs can be carried in its place. The hanger is part of a small mission bay that can be reconfigured to suit different missions and accommodate different modular equipment fits. In the standard layout, the mission bay can accommodate a single helicopter and two 7.5m RIBs that can be davit-launched from side access doors. Displacement is approximately 2000 tonnes, with a length of just over 100m and a beam of 15m. Maximum speed is 28 knots and has a range of 4500 miles at a cruising speed of 17 knots. There is standard crew of 65 but up to 15 extra personnel can be accommodated as required.

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Below are the images that gave me the basic design:
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Author:  acelanceloet [ April 20th, 2013, 10:51 pm ]
Post subject:  Re: Challenger class corvette
my estimate for your dimensions would be about 5000+ tonnes, so 2000 seems a bit low to me. for an speed of 28 knots I would suppose the engines be gas turbines, for which you lack intakes.
also, could you please replace that screw with an newer drawing of an propeller which actually fits this type of vessel? and also please take the newest SMART-S radar from the dutch parts sheet, as this drawing is quite oversized.
Author:  Thiel [ April 21st, 2013, 8:11 am ]
Post subject:  Re: Challenger class corvette
I'd say you're off by 2000t ace. The Gowind class itself weighs in at 2000-2500t a piece depending on model.
This ship has slightly more beam, but not a lot so I'd be surprised if it clocks in at more than 3000t.
Author:  acelanceloet [ April 21st, 2013, 8:48 am ]
Post subject:  Re: Challenger class corvette
depends on the draft. my first estimate was that it would have an draft of 8 meters, which, with an Cb of 0,5 (which is on the low side) the displacement would be 8*15*100*0,5= 6000 tons. if we would go for 5 meters, 5*15*100*0,5= 3750. the Cb would most likely be between 0,5 and 0,65 for an vessel like this, so 4000+ at least would not seem that weird to me?
Author:  Thiel [ April 21st, 2013, 8:54 am ]
Post subject:  Re: Challenger class corvette
Ace, it's a Gowind with an extra 80cm of beam.
Author:  acelanceloet [ April 21st, 2013, 9:00 am ]
Post subject:  Re: Challenger class corvette
then the draft is way oversized on this drawing. from my estimates on the gowind class, the draft should be approx 3,4 meters on the keel,
Author:  heuhen [ April 21st, 2013, 11:17 am ]
Post subject:  Re: Challenger class corvette
acelanceloet wrote:
depends on the draft. my first estimate was that it would have an draft of 8 meters, which, with an Cb of 0,5 (which is on the low side) the displacement would be 8*15*100*0,5= 6000 tons. if we would go for 5 meters, 5*15*100*0,5= 3750. the Cb would most likely be between 0,5 and 0,65 for an vessel like this, so 4000+ at least would not seem that weird to me?

that where that type of math is going to go wrong:

if I do that to the Fridtjof Nansen class I get 8554 tons when see weight just 5200 tons (7,6*16,8*134*0,5) but if I give it a CB of 0,30395...

In some fashion that type of math you do is calculating the weight of an box, and as we all know a box is not an hull! At the moment I don't remember but my teacher back in the days when I did go on an engineering school he learned us to do four three math on the hull, do the same calculation as you do but we calculated the hull at three area: "Aft, center, bow" and used them to get a more accurate number!
Author:  acelanceloet [ April 21st, 2013, 11:30 am ]
Post subject:  Re: Challenger class corvette
do you have the waterline length and beam, heuhen, and draft at the keel? and take a look, that 0,5 is for the Cb (I can say you, the Cb of the nansen is between 4,5 and 5,5 most likely, only sailing yachts get lower then 0,35)
these above are just estimations, of course there are more accurate ways ;)
Author:  heuhen [ April 21st, 2013, 11:56 am ]
Post subject:  Re: Challenger class corvette
acelanceloet wrote:
do you have the waterline length and beam, heuhen, and draft at the keel? and take a look, that 0,5 is for the Cb (I can say you, the Cb of the nansen is between 4,5 and 5,5 most likely, only sailing yachts get lower then 0,35)
these above are just estimations, of course there are more accurate ways ;)

There are alwaysing something better, and that's is whay I always is cheating in math and using a computer! :lol:
Author:  SilentRunning [ April 22nd, 2013, 7:17 pm ]
Post subject:  Re: Challenger class corvette
acelanceloet wrote:
my estimate for your dimensions would be about 5000+ tonnes, so 2000 seems a bit low to me. for an speed of 28 knots I would suppose the engines be gas turbines, for which you lack intakes.
also, could you please replace that screw with an newer drawing of an propeller which actually fits this type of vessel? and also please take the newest SMART-S radar from the dutch parts sheet, as this drawing is quite oversized.
I've made some modifications so hopefully it's looking more realistic now. I've also added a Centurion revolving decoy launcher.

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