Sub Cavitation Parameters?

captinjoehenry · 08-09-17, 10:45 PM

Subs have CavitationParameters and I am wondering what the numbers mean as I am messing around with fictional high speed subs :P

goldfish716 · 08-09-17, 11:48 PM

"The in-game formula for this is 'Cavitation depth = 20 * SpeedInKnots - 100'. What this means is that for every 5 knots of extra speed, cavitation happens 100 feet earlier. "

http://gameplay.tips/guides/653-cold-waters.html

20 * 5 knots -100 = 0 feet
20 * 10 knots -100 = 100 feet
20 * 15 knots -100 = 200 feet
20 * 30 knots -100 = 500 feet

captinjoehenry · 08-10-17, 09:05 AM

I am talking about the line in the submarines data file. It looks like this:
CavitationParameters=15,-155
And I am wondering what those 2 numbers mean and how they effect the subs cavitation speed.

sacasoh · 08-10-17, 09:50 AM

Based on goldfish716 post, one would guess that the parameters that you spoke of "CavitationParameters=a, b" (with a= 15, and b = -155 in your example), would be plugged into the formula "'Cavitation depth = a * SpeedInKnots - b'".

But the above is just a guess, I can't test it right now...

goldfish716 · 08-10-17, 12:37 PM

Right. The first number is the number of feet you have to go (per knot) before cavitation stops.

The second number moves the whole plot up or down.

Its essentially just a linear equation like you learned in school ax+b=Y.

Where x is knots and y is depth.

08-13-17, 01:48 PM

So the deeper we go, the faster and the less likely for cavitation?

As where more shallow, more likely to cavitate unless slower prop rotation = slower boat speed?

As in more dense the water, the less bubble creation = less noise?
(for those of us that suck at ax+b=Y :-p

The reverse is true that

wolfvo · 05-06-20, 02:50 PM

I found that this combination lets my particular sub go at 500 knots with no cavitation even at the surface. Sure not balanced but I don't care as I am playing for the fun. So if you want to have some fun and unbalance your sub go ahead and change your parameters to these. Just make sure to backup a copy of your original file so you can revert back if you desire to.

[Movement]
SurfaceSpeed=30
SubmergedSpeed=62
TelegraphSpeeds=-5,0,5,10,20,30,500
AccelerationRate=600
DecelerationRate=28
RudderTurnRate=2.8
TurnRate=8.9
PivotPointTurning=0.256
DiveRate=5
SurfaceRate=5
BallastRate=0.27
Waterline=0.04
SubmergedAt=0.15
CavitationParameters=1,-1000
PropRotationSpeed=-190,-190
TestDepth=5000
EscapeDepth=500
PeriscopeDepthInFeet=250

Aktungbby · 05-06-20, 02:53 PM

wolfvo!

08-09-17, 10:45 PM	#1
captinjoehenry Swabbie Join Date: Jun 2017 Posts: 14 Downloads: 7 Uploads: 0	Sub Cavitation Parameters? Subs have CavitationParameters and I am wondering what the numbers mean as I am messing around with fictional high speed subs :P

05-06-20, 02:53 PM	#8
Aktungbby Gefallen Engel U-666 Join Date: Jul 2013 Location: On a tilted, overheated, overpopulated spinning mudball on Collision course with Andromeda Galaxy Posts: 29,984 Downloads: 24 Uploads: 0	welcome aboard! wolfvo! __________________ "Only two things are infinite; The Universe and human squirrelyness?!!

08-09-17, 11:48 PM	#2
goldfish716 Sailor man Join Date: Jun 2017 Posts: 47 Downloads: 14 Uploads: 0	"The in-game formula for this is 'Cavitation depth = 20 * SpeedInKnots - 100'. What this means is that for every 5 knots of extra speed, cavitation happens 100 feet earlier. " http://gameplay.tips/guides/653-cold-waters.html 20 * 5 knots -100 = 0 feet 20 * 10 knots -100 = 100 feet 20 * 15 knots -100 = 200 feet 20 * 30 knots -100 = 500 feet

08-10-17, 09:05 AM	#3
captinjoehenry Swabbie Join Date: Jun 2017 Posts: 14 Downloads: 7 Uploads: 0	I am talking about the line in the submarines data file. It looks like this: CavitationParameters=15,-155 And I am wondering what those 2 numbers mean and how they effect the subs cavitation speed.

08-10-17, 09:50 AM	#4
sacasoh Nub Join Date: Aug 2008 Posts: 3 Downloads: 40 Uploads: 0	Based on goldfish716 post, one would guess that the parameters that you spoke of "CavitationParameters=a, b" (with a= 15, and b = -155 in your example), would be plugged into the formula "'Cavitation depth = a * SpeedInKnots - b'". But the above is just a guess, I can't test it right now...

08-10-17, 12:37 PM	#5
goldfish716 Sailor man Join Date: Jun 2017 Posts: 47 Downloads: 14 Uploads: 0	Right. The first number is the number of feet you have to go (per knot) before cavitation stops. The second number moves the whole plot up or down. Its essentially just a linear equation like you learned in school ax+b=Y. Where x is knots and y is depth.

08-13-17, 01:48 PM	#6
phelan1777 Stowaway Posts: n/a Downloads: Uploads:	So the deeper we go, the faster and the less likely for cavitation? As where more shallow, more likely to cavitate unless slower prop rotation = slower boat speed? As in more dense the water, the less bubble creation = less noise? (for those of us that suck at ax+b=Y :-p The reverse is true that

05-06-20, 02:50 PM	#7
wolfvo Bilge Rat Join Date: Mar 2018 Posts: 1 Downloads: 1 Uploads: 0	I found that this combination lets my particular sub go at 500 knots with no cavitation even at the surface. Sure not balanced but I don't care as I am playing for the fun. So if you want to have some fun and unbalance your sub go ahead and change your parameters to these. Just make sure to backup a copy of your original file so you can revert back if you desire to. [Movement] SurfaceSpeed=30 SubmergedSpeed=62 TelegraphSpeeds=-5,0,5,10,20,30,500 AccelerationRate=600 DecelerationRate=28 RudderTurnRate=2.8 TurnRate=8.9 PivotPointTurning=0.256 DiveRate=5 SurfaceRate=5 BallastRate=0.27 Waterline=0.04 SubmergedAt=0.15 CavitationParameters=1,-1000 PropRotationSpeed=-190,-190 TestDepth=5000 EscapeDepth=500 PeriscopeDepthInFeet=250