Search the archive:
YaBB - Yet another Bulletin Board
 
   
 
Pages: 1 2 
Send Topic Print
How do I slow down? (Read 1198 times)
Apr 22nd, 2010 at 11:31am

RAFAIR100   Offline
Colonel
I love YaBB 1G - SP1!

Posts: 217
*****
 
I have downloaded the F-106A (from a well known designer!)
Nice model and the aircraft flies well.     Problem is that it won't slow down.      At 2000 feet, throttles closed, it cruises along at M0.9       The problem seems to stem from the engine rpm which stick at 65-68% no matter what one does with the throttles.    Makes for some exciting approaches!      Can anyone suggest how to get the rpm back to a realistic idle setting with throttles closed?
 
IP Logged
 
Reply #1 - Apr 22nd, 2010 at 11:50am
Crash   Ex Member

 
Without looking at the model you downloaded:

Close throttles
Shut down engines
Full flaps
Airbrake
Gear down
Point nose towards tarmac
Keep fingers crossed

The above not in any particular order...

Carlo Wink

PS. Just kidding ofcourse. Pressing F1 (or F2, try it out) will close your throttles completely. Maybe that helps?
 
IP Logged
 
Reply #2 - Apr 22nd, 2010 at 12:01pm

Fozzer   Offline
Colonel
An elderly FS 2004 addict!
Hereford. England. EGBS.

Posts: 24861
*****
 
Quote:
Without looking at the model you downloaded:

Close throttles
Shut down engines
Full flaps
Airbrake
Gear down
Point nose towards tarmac
Keep fingers crossed

The above not in any particular order...

Carlo Wink

PS. Just kidding ofcourse. Pressing F1 (or F2, try it out) will close your throttles completely. Maybe that helps?


..I do all of the above...

...plus...I close my eyes, and think furiously of England!... Shocked.... Grin....!

Paul...I like Piston Engines....they close down quicker!... Grin...!
 

Dell Dimension 5000 BTX Tower. Win7 Home Edition, 32 Bit. Intel Pentium 4, dual 2.8 GHz. 2.5GB RAM, nVidia GF 9500GT 1GB. SATA 500GB + 80GB. Philips 17" LCD Monitor. Micronet ADSL Modem only. Saitek Cyborg Evo Force. FS 2004 + FSX. Briggs and Stratton Petrol Lawn Mower...Motor Bikes. Gas Cooker... and lots of musical instruments!.... ...!
Yamaha MO6,MM6,DX7,DX11,DX21,DX100,MK100,EMT10,PSR400,PSS780,Roland GW-8L v2,TR505,Casio MT-205,Korg CX3v2 dual manual,+ Leslie 760,M-Audio Prokeys88,KeyRig,Cubase,Keyfax4,Guitars,Orchestral,Baroque,Renaissance,Medieval Instruments.
IP Logged
 
Reply #3 - Apr 22nd, 2010 at 12:05pm

ozzy72   Offline
Global Moderator
Pretty scary huh?
Madsville

Gender: male
Posts: 37122
*****
 
It is probably a case of the last flight you saved you were flying with this level of throttle whilst using the AP. It is a well known bug in FS9.
Try closing your throttle on your stick then pressing F1, this should close the throttle down.
Failing that just load a different flight, land it and close the throttle then save (make sure the autopilot is OFF) Wink
 

...
There are two types of aeroplane, Spitfires and everything else that wishes it was a Spitfire!
IP Logged
 
Reply #4 - Apr 22nd, 2010 at 1:26pm

RAFAIR100   Offline
Colonel
I love YaBB 1G - SP1!

Posts: 217
*****
 
Thank you Ozzy.    I'll try that next time out.     To the others, thanks but no thanks.
 
IP Logged
 
Reply #5 - Apr 22nd, 2010 at 8:53pm

olderndirt   Offline
Colonel
Flying is PFM
Rochester, WA

Gender: male
Posts: 3574
*****
 
Fozzer wrote on Apr 22nd, 2010 at 12:01pm:
I close my eyes, and think furiously of England
As a person of the Scottish persuasion, I've done this most of my life  Cheesy.  Just kidding Fozz.
 

... 

                            
THIS IS NOT A PANAM CLIPPER

                                                            
IP Logged
 
Reply #6 - Apr 23rd, 2010 at 1:51pm

RAFAIR100   Offline
Colonel
I love YaBB 1G - SP1!

Posts: 217
*****
 
Ozzy,     I appreciate your suggestions.     Unhappily, neither option worked.    I still can't get the RPM down below 65%.     Can you suggest anything else?
 
IP Logged
 
Reply #7 - Apr 23rd, 2010 at 2:17pm

JoBee   Offline
Colonel
Better to give than receive.

Posts: 582
*****
 
Try "leaning the mixture".

Even though jet engines don't have mixture controls in the RW, they seem to in FS.

Press CTRL+SHIFT +F2 until right before the engine cutoff and see if that helps.

cheers,
Joe
 

Don't argue with idiots, they drag you down to their level and beat you with experience.
IP Logged
 
Reply #8 - Apr 23rd, 2010 at 3:25pm

Groundbound1   Offline
Colonel
No, I don't work for Mythbusters...
Michigan, USA

Gender: male
Posts: 1745
*****
 
I have two questions. Is this a a model native to FS9? Are you using a joystick and/or a throttle quadrant, or the keyboard for control?

Also a link to the model might prove helpful.
 

Specs: Asus Crosshair nForce 590 SLI,
AMD Athlon X2 6400+ w/ZeroTherm BTF90, 
4GB G.Skill PI Series DDR2-800,
Sapphire HD4870 512MB,
PC P&C 750 Quad, in a CoolerMaster HAF932

...
IP Logged
 
Reply #9 - Apr 23rd, 2010 at 6:34pm

-Crossfire-   Offline
Colonel
Northern Canada

Gender: male
Posts: 954
*****
 
I'll be the first to say this.... that is normal idle for a jet engine!  What you are reading is N1 rpm, the gas generator speed.

You cannot "lean the mixture" in a jet engine.  It's fuel or no fuel.

In a turboprop, the condition levers usually have 3 settings, cut-off, low idle, and high idle.  At low idle, you're N1 speed stays down.... 20-30 % depending on aircraft.  At high idle, N1 will be up at 50% or over.  This is normal.

If you are cruising along at 2000 feet at mach 0.9, I'd say there is a problem with your flight model.  Most aircraft will slow down with the throttles closed... aerodynamic drag.
 

...
IP Logged
 
Reply #10 - Apr 24th, 2010 at 5:59am

microlight   Offline
Colonel
It's a bird...
Southern UK

Gender: male
Posts: 2236
*****
 
That's how it appears to me too. Quick way of finding out is to try increasing the parasite drag figure in the [flight_tuning] section of the aircraft.cfg file from 1.0 (maybe start at 1.3 or 1.4), and see what effect it has when you idle the engines.

Wink
 

...
BAe ATP for FS9 now available! www.enigmasim.com
IP Logged
 
Reply #11 - Apr 27th, 2010 at 11:17am

Nav   Offline
Colonel

Posts: 717
*****
 
RAFAIR100, jets are just 'different.' Smiley

For a start, they're enormously streamlined. Beyond that, their ASIs - 'Air Speed Indicators' - 'under-read' at height, given that they work on air pressure. So a jet doing say 550 knots at 35,000 feet will only show say 275 on the ASI. The Mach. speed, on the other hand, is calculated taking air pressure into account - so it gives the 'true speed' expressed as a percentage of the speed of sound,

Even so, on a landing approach on ANY aeroplane, you should work on knots, NOT Mach. numbers.

Trick is, starting a landing descent, set the 'Speed Hold' to say 240 knots. That will probably be all of 500 knots at height, but it is 'self-adjusting' as you get lower, into thicker air.

Once down to approach height, say 2,500 feet AGL, set the airspeed to 140 knots and progressively add flap. 140 knots is just about the 'standard' landing speed for jets. You have to bear in mind that, being so streamlined, those things take absolutely AGES to slow down... Smiley

More advice on here:-

http://205.252.250.26/cgi-bin/yabb2/YaBB.pl?board=COF;action=display;num=1111322...
« Last Edit: Apr 28th, 2010 at 12:42am by Nav »  
IP Logged
 
Reply #12 - Apr 27th, 2010 at 12:18pm

1olehippy   Offline
Colonel
I'll try it once for sure
Beautiful Colorado

Gender: male
Posts: 178
*****
 
Go to /msdn.microsoft.com/en-us/library/cc526949.aspx#mozTocId136011  and look under "general engine data". You can set your "min_throttle_limit".
Also find "AirEd" in General Tools & Utilities, page 2 this will allow you to edit flight dynamics.  By George that should slow you down.

Dave  Wink
 
IP Logged
 
Reply #13 - Apr 27th, 2010 at 2:19pm

DaveSims   Offline
Colonel
Clear Lake, Iowa

Gender: male
Posts: 2453
*****
 
Nav wrote on Apr 27th, 2010 at 11:17am:
RAFAIR100, jets are just 'different.' Smiley

For a start, they're enormously streamlined. Beyond that, their ASIs - 'Air Speed Indicators' - are hopelessly inaccurate, given that they work on air pressure. So a jet doing say 550 knots at 35,000 feet will only show say 275 on the ASI.....

Even so, on a landing approach on ANY aeroplane, you should work on knots, NOT Mach. numbers.

Trick is, starting a landing descent, set the 'Speed Hold' to say 240 knots. That will probably be all of 500 knots at height, but it is 'self-adjusting' as you get lower, into thicker air.

Once down to approach height, say 2,500 feet AGL, set the airspeed to 140 knots and progressively add flap. 140 knots is just about the 'standard' landing speed for jets. You have to bear in mind that, being so streamlined, those things take absolutely AGES to slow down... Smiley

More advice on here:-

http://205.252.250.26/cgi-bin/yabb2/YaBB.pl?board=COF;action=display;num=1111322...


Just wanted to clarify something you said.  Airspeed indicators in jets are not inaccurate, you are just talking about the difference between indicated airspeed, and true airspeed.  That is caused entirely because of the thinner air at higher altitudes, and would affect even a glider at high enough altitudes.  Even at under 10,000 feet, you could have a difference of several kts.  It isn't an inaccuracy, but just the way the system works.  In reality, indicated airspeed is good to know, even at high altitude, because the way the lower pressure affects the airspeed indicator, is the same that it affects the wings.  You will stall at the same indicated airspeed at any altitude, a good number to know.
 
IP Logged
 
Reply #14 - Apr 28th, 2010 at 12:44am

Nav   Offline
Colonel

Posts: 717
*****
 
Good point, davysims, careless phrasing - amended.
 
IP Logged
 
Pages: 1 2 
Send Topic Print