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Falcon 900 Speed Drops (on FSX)  
User currently offlineWardialer From United States of America, joined Sep 2001, 1182 posts, RR: 0
Posted (5 years 10 months 2 weeks 6 days 15 hours ago) and read 13776 times:

Hi all,

I just downloaded a Falcon 900B aircraft and everything seems to work fine exceot that during climb, the speeds tends to drop constantly above 20,000 feet. Its NOT that bad its like 3 to 8 knots but I can see it drop.

Here are my fuel and current payload settings that I set myself as the default was the max qty...

PAYLOAD:

0 POUNDS

FUEL:

TANK-1
40 %
CENTER TANK
40 %
TANK-3
40 %

Now how can I achieve the best performance to prevent the IAS speed from dropping during climb? The weather settings are pretty much standard and the flaps are set to UP during climb.

Also, I did set the fuel settings to EMTPY and tried that and that helped alot but sood after it reached my cruise alt....the plane began rocking back and forth a bit...But when I added these settings above, that stopped.

Are these payload and fuel settings adequate?

Are Falcons really loose quite much airspeed during a climb?

Please help.

[Edited 2008-06-08 12:00:49]

14 replies: All unread, jump to last
 
User currently offlinePJFlysFast From United States of America, joined May 2006, 463 posts, RR: 1
Reply 1, posted (5 years 10 months 2 weeks 6 days 9 hours ago) and read 13760 times:

First off I have to ask where you got a Falcon 900 and how realistic it is! Second off are you using vertical speed to climb because you can stall using that and you can also not control the speed with it. If you are using FLT to climb than you have no speed loss. Anyways tell me what autopilot setting you are using to climb and again I have to know where this Falcon 900 is so I can get it!

User currently offlineWardialer From United States of America, joined Sep 2001, 1182 posts, RR: 0
Reply 2, posted (5 years 10 months 2 weeks 6 days 5 hours ago) and read 13752 times:

I got it here. But it for FS2004 and still works OK on FSX. Except for its panel. I am using the A321 panel instead.
http://www.fsfield.com/viewfile/939.html

I am using autopilto for all my flights using vertical speed selection....
What is FLT??

Thanks.


User currently offlineWardialer From United States of America, joined Sep 2001, 1182 posts, RR: 0
Reply 3, posted (5 years 10 months 2 weeks 6 days 5 hours ago) and read 13748 times:

Ok, now I had set the fuel settings to 50 % on each tanks...and payload to ZERO.

This had improved the performance....just still I want to know the ideal fuel settings for best performance.


User currently offlineMir From United States of America, joined Jan 2004, 21129 posts, RR: 56
Reply 4, posted (5 years 10 months 2 weeks 6 days 4 hours ago) and read 13744 times:



Quoting Wardialer (Thread starter):
Now how can I achieve the best performance to prevent the IAS speed from dropping during climb?

The IAS should drop during the climb. Try it again and see what happens with the TAS (or if you can't determine that, set winds to zero and use groundspeed). If the TAS keeps climbing, all is well. If it too starts dropping off above 20,000ft, then something is awry.

Quoting Wardialer (Reply 2):
What is FLT??

The flight level change function, normally abbreviated FLC or FLCH. It will set the engines to a specific power setting, use pitch to hold the selected airspeed, and accept whatever rate of climb it gets. This is the best way to do a climb or descent, but the default autopilot, and anything based off the default autopilot, won't have the function. You can simulate it by leaving the autothrottles off, setting your climb power manually, and adjusting the vertical speed to maintain the airspeed you want (which should be best rate of climb speed - not sure what that is for the F900).

-Mir



7 billion, one nation, imagination...it's a beautiful day
User currently offlineWardialer From United States of America, joined Sep 2001, 1182 posts, RR: 0
Reply 5, posted (5 years 10 months 2 weeks 5 days 23 hours ago) and read 13739 times:

Thanks for your support on this.

I was very very happy that this 2004 FS aircraft even managed to run on FSX since its very hard to get biz-jets for FSX as it is...

So, my last questions would be are my fuel settings adequate enough as far as setting for each tanks to 50 percent and payload being zero?
That would be a fuel payload of 10000 pounds and the max would be like 20000 punds of fuel. So its really half of that....
But would this be OK?

Also, I did a test flight and the IAS remained at 300 knots for at least until 23,000 feet and then started dropping gradually (NOT like a rock though)...to 280 at 26000 feet and then to 276 all the way up to 30000 feet.

Is this normal for a real-world Falcon-900 to have its IAS speed drop between those altitudes? I though these planes have good performance while the statistics say that it can travel at 0.84 at 42000 feet.
So if the IAS drops like this, then I can imagine it will REALLY drop near or at 42000 feet....


User currently offlinePJFlysFast From United States of America, joined May 2006, 463 posts, RR: 1
Reply 6, posted (5 years 10 months 2 weeks 5 days 21 hours ago) and read 13729 times:



Quoting Wardialer (Reply 5):
Also, I did a test flight and the IAS remained at 300 knots for at least until 23,000 feet and then started dropping gradually (NOT like a rock though)...to 280 at 26000 feet and then to 276 all the way up to 30000 feet.

Is this normal for a real-world Falcon-900 to have its IAS speed drop between those altitudes? I though these planes have good performance while the statistics say that it can travel at 0.84 at 42000 feet.
So if the IAS drops like this, then I can imagine it will REALLY drop near or at 42000 feet....

Yes this is what really happens  Smile


User currently offlineWardialer From United States of America, joined Sep 2001, 1182 posts, RR: 0
Reply 7, posted (5 years 10 months 2 weeks 5 days 20 hours ago) and read 13726 times:

Hi,

Is my current fuel qtys OK from my last posting?

And how can the performance stats indicate that the F-900 can criuse 0.84 at 42,000 feet and be certified to fly 51,000 feet when the its airspeed drops like this above 20,000 feet
(usually to about from 310 to 270 knots)....And when reaching 35000 feet or more, it drops to 263 to 255 knots. The groundspeed or TAS usually indicates 375 to 420 knots during climb when above 18000 feet.

Can someone explain this?
Or...is it a malfunction from who it was programmed this aircraft??


User currently offlineWardialer From United States of America, joined Sep 2001, 1182 posts, RR: 0
Reply 8, posted (5 years 10 months 2 weeks 5 days 15 hours ago) and read 13712 times:

Hi,

Regarding the F-900B aircraft I will just leave it how it is for now..nayway, its not meant to fly like the Condorde anyway...

Now, I have downloaded the Falcon-10...(for FS2004) and seems to be running well under FSX also...

Only one issue with that is, is that during the take-off roll, it has a little right tendency in stearing control...It just wants to always pull to the right for some reason...Is there anyway to fix this problem??

And its a its a bit powerfull as far as stable airspeed during the climb...

Thanks in advance.


User currently offlineWardialer From United States of America, joined Sep 2001, 1182 posts, RR: 0
Reply 9, posted (5 years 10 months 2 weeks 5 days ago) and read 13695 times:

Hi guys,

Is there a trick or something that will fix the eratic behavour for my ground steerring during take-off roll or taxiing.
On take-off roll, it has this right tendency. Now this issue is on the Falcon 10 that I just downloaded and runs on FSX even though its for FS2004.

When airborne, it flys GREAT!!!!!!! Except for the eratic steering when taxiing or take-off roll.

I am using a mouse for my controls.

What can cause this?

Or, is it just a bug in the program from the person who created it?

Please help, as I love to keep this aircraft for FSX


User currently offlineDavid L From United Kingdom, joined May 1999, 9487 posts, RR: 42
Reply 10, posted (5 years 10 months 2 weeks 4 days 22 hours ago) and read 13689 times:

Quoting Wardialer (Reply 7):
And how can the performance stats indicate that the F-900 can criuse 0.84 at 42,000 feet and be certified to fly 51,000 feet when the its airspeed drops like this above 20,000 feet
(usually to about from 310 to 270 knots)....And when reaching 35000 feet or more, it drops to 263 to 255 knots.

The maximum IAS while you're climbing will be less than the IAS you can achieve after you level off. If the F900 can cruise at Mach 0.84 at 42,000 ft then it probably can't do that while climbing (unless very gradually) at around 42,000 ft.

Edit: I don't know about the steering problem, though.

[Edited 2008-06-10 05:04:23]

User currently offlineWardialer From United States of America, joined Sep 2001, 1182 posts, RR: 0
Reply 11, posted (5 years 10 months 2 weeks 4 days 21 hours ago) and read 13685 times:

Another issue.....And I think theres a bit of a flaw from whoever created this aircraft for FS.

Because when I do level-off I set my auto-pilot to Mach 0.84 and it only goes up to 0.81 at 34000 feet with no wind and the groundspeed and TAS is maxed out at 470 knots.
And plus, it does not give me the over-speed audible warning either
I find this wierd...

And what about the fuel settings? Each tanks are at 50 percent with a total payload of 10000 pounds.
Is this OK?


User currently offlineDavid L From United Kingdom, joined May 1999, 9487 posts, RR: 42
Reply 12, posted (5 years 10 months 2 weeks 4 days 19 hours ago) and read 13680 times:



Quoting Wardialer (Reply 11):
And what about the fuel settings? Each tanks are at 50 percent with a total payload of 10000 pounds.
Is this OK?

You take as much fuel as you need to get you safely where you're going.


User currently offlineMir From United States of America, joined Jan 2004, 21129 posts, RR: 56
Reply 13, posted (5 years 10 months 2 weeks 4 days ago) and read 13653 times:



Quoting Wardialer (Reply 5):
Also, I did a test flight and the IAS remained at 300 knots for at least until 23,000 feet and then started dropping gradually (NOT like a rock though)...to 280 at 26000 feet and then to 276 all the way up to 30000 feet.

Is this normal for a real-world Falcon-900 to have its IAS speed drop between those altitudes?

Absolutely.

Quoting Wardialer (Reply 5):
I though these planes have good performance while the statistics say that it can travel at 0.84 at 42000 feet.
So if the IAS drops like this, then I can imagine it will REALLY drop near or at 42000 feet....

Check your mach number. If it's holding constant in the climb, it doesn't matter how much your IAS drops (so long as you don't get toward stall speed).

Quoting Wardialer (Reply 11):
Because when I do level-off I set my auto-pilot to Mach 0.84 and it only goes up to 0.81 at 34000 feet with no wind and the groundspeed and TAS is maxed out at 470 knots.

This is with full power? If so, it's probably a bad design on the part of the developer, but .81 is not bad if you can live with it. If it isn't, it could be a common problem with the auto-pilot, where you don't get exactly the speed that you set. Try setting it to .86 and see if you get closer to .84. Eventually you'll find the setting that you need to get the speed you want (and it won't be the same from flight to flight, so you have to fiddle with it).

-Mir



7 billion, one nation, imagination...it's a beautiful day
User currently offlineWardialer From United States of America, joined Sep 2001, 1182 posts, RR: 0
Reply 14, posted (5 years 10 months 1 week 6 days 22 hours ago) and read 13601 times:

Hi,

OK, this may sound really stupid, but I had downloaded a Dassault Falcon 900B and it seems underpowered during climb and cruise.

So...heres what I want to do...I want to just only copy and paste the files from the A321 directory to ONLY have the A321's performance and power and ONLY keeping the Falcon 900B image.......So what files from the A321 directory should I only copy and paste into the Falcon 900's directory to only have the A321's power and but keeping the Falcon 900 image??

In other words...since the downloaded falcon 900's performance is underpowered, I want to have the A321's power performance but leaving the Falcon 900's image in place...

Please help and I know this sounds dumb but I really want to test this out....

Thanks alot in advance!!!!!


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