Too much smoke!

sp762 · Post by **sp762** » Tue Sep 30, 2003 7:56 am

If you downloaded my Manning Wardle, you'll see that it actually develops quite a lot of smoke for it's size. I'm trying to trim this down.

What are the variables that really control this, and what are the guidelines for doing so...

Thanks in advance

Mike

CaptainBazza · Post by **CaptainBazza** » Wed Oct 08, 2003 4:58 am

Stick some Nicarette patches on it's smoke box, Mike

daveannjon · Post by **daveannjon** » Thu Oct 16, 2003 9:23 pm

Have a go at reducing the 'smoke quantity' variable - its third to last in Engine Variables in the eng file and is often about 650. It's near the end of the eng file just before the cab sms usually.
Cheers
Dave W

bravedan · Post by **bravedan** » Thu Nov 20, 2003 10:01 pm

SteamSmokeUnitsPerPoundOfFuel

SteamMaxSmokeUnitsReleaseRate

Both single numbers, range normally 1 to 8

Dave

gopher · Post by **gopher** » Sat Dec 06, 2003 3:58 pm

sp762 · Post by **sp762** » Sat Dec 06, 2003 10:13 pm

Thanks - I always thought that must be the answer - but I never thought that small.

Will now rush off and try it out.

Mike

sp762 · Post by **sp762** » Thu Dec 02, 2004 6:46 am

Nearly a year later, and I think I fixed the problem.

I got really peeved because no engine variable seemed to be fixing the problem with "General Melchett". As a last resort I raised the height of the StackFX marker - and the problem went away as if by magic.

I can only assume that the smoke 'bits' get caught up in the bounding box - causing the odd effect. I will experiment further.

Perhaps nobody cares - but I'm pleased!

BobLatimer · Post by **BobLatimer** » Thu Dec 02, 2004 6:54 am

Some of us DO care Mike.

And we're pleased too.

1crick14a · Post by **1crick14a** » Thu Dec 02, 2004 7:04 am

Mike

This one can help with a bit of tuning as well...........

StackFX
(
0 4.041 4.755
0 0.9 0
0.275
)

Top numbers are positions
Middle ones direction side/up/fowards.
Last size of the chimneys diameter

Regards, Rick

SteveFranks · Post by **SteveFranks** » Thu Jul 28, 2005 6:52 am

I am been trying to reduce the amount of smoke on small, narrow gauge tankers but to no avail.

I have changed the supposed value in the EngineVariables of 250 down to 000 without any effect.

EngineVariables ( 600 750 900 140 0.7 900 900 250 1 1)

I have also played with these values below. Regardless the value change the smoke amount is unchanged unless set to 0. Then is stops entirely. Its either on or off regardless of value above zero.

SteamSmokeUnitsPerPoundOfFuel ( 6.3)
SteamMaxSmokeUnitsReleaseRate ( 10)

I am perplexed!

tinsley · Post by **tinsley** » Thu Jul 28, 2005 12:09 pm

There is an error in the sequence of the variables.. this is supposed to be the right one,can't remember who corrected it....it's the one I use without problem...

comment(fire temp, fire mass, water mass, boiler pressure, water level, tender_water_mass, smoke_quantity, tender_coal_mass, fire_condition, coal quality )
Use the values from the eng for the first figures...for the last 4 try..
150 1 0.9 0.85 honest.. try them you can play around with the 150 number..see if it works for you..

1crick14a · Post by **1crick14a** » Thu Jul 28, 2005 5:41 pm

EngineVariables ( 600 750 900 140 0.7 900 900 250 1 1)

Steve

Reduce the figures 900 to 1 and then below for the others

SteamSmokeUnitsPerPoundOfFuel ( 1 )
SteamMaxSmokeUnitsReleaseRate ( 10 )

Rick

SteveFranks · Post by **SteveFranks** » Fri Jul 29, 2005 4:46 am

Thanks guys for the correction info in the variables comment line.

As for juggling the values, in both suggestions there was not an appreciable change in the smoke plume considering the drastic change in engvalues (900 to 0.900, 250 to 0.250) and smoke units (6.3 to 1.3, 10 to 2), except that it is now more white than dark grey.

There also doesn't seem to be anything one can do for the length of the plume which I'd like to cut by 70%.

I wonder, of all the hundreds of values and line arguments in these eng/wag files, just how many ACTUALLY DO ANYTHING -- really. Bet 80% could be chopped out without any significant difference from the engineer's seat.

SteveFranks · Post by **SteveFranks** » Fri Jul 29, 2005 5:19 am

Coming back to this subject, and after reading several other posts throughout this thread, I may have to amend conclusions in my last post.

The drastic change in color - dark grey to white, likely means that juggling these number does indeed work and what I am looking at is steam exhaust going up the stack in huge quantities. What can be done about that?

Have any thoughts been put to this angle?

1crick14a · Post by **1crick14a** » Fri Jul 29, 2005 8:03 am

Steve

Look into this parameter............

StackFX
(
0 4.1 3.55
0 1 0
0.25
)

By lowering this figure in red it can reduce the way the smoke
effect leaves the chimney/stack 0.8 0.9 all good, even less if
you feel the need to.

Rick

Atomic Systems

Too much smoke!

Too much smoke!

Cough, cough!