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A question re Flight Dynamics

A

Aztec

Charter Member
G'day all

I was wondering if anyone could offer advice on the following topic. I recently got the Dreamfleet Baron, but am not entirely happy with the flight dynamics, namely the high nose attitude in the latter stages of the approach. I was wondering whether their is any way to adopt the default Baron's flight dynamics - is it a matter of just using that air file, or will this introduce another range of complexities? Or is it possible to adjust the flight tuning parameters in the acft cfg?
Any help would be greatly appreciated.

Cheers

Az
 
Someone who knows what they're doing (that wouldn't be me) could probably make the adjustments in the aircraft.cfg or AIR file.

You can adapt the flight model from the stock plane by substituting the following sections in the Aircraft.cfg file from the Dreamfleet plane: Contact Points, Lights, Views, and if present, Smokesystem. And of course, the user interface sections for the different paints.
 
By latter stages do you mean as flaps are deployed? If so then the cfg [flaps] section should have a line 'pitch_scalar=...'. This value typically works within the range of -1.00 to +1.00. You can try changing it, re-load the aircraft and see what happened. Otherwise more may be involved. As far as using the default I can't say. The designer may have started with a different zero point from which all parameters were measured. I assume minor changes are OK with Dreamfleet. They may even appreciate feedback like PAD.
 
Thanks guys.

Aeromed, yeah the issue is more so at full flap when trying to get it back to 85kts or so - the deck angle is far too high for my liking. I found reference to it at the DF forums a while ago, but understandably the folk at DF discouraged modifying any files regarding handling.
It's been a while since I've flown the Baron but I'll try and do a couple of laps in it this weekend to refine the nature of the problem a bit more.

Cheers

Az
 
Aztec said:
G'day all

I was wondering if anyone could offer advice on the following topic. I recently got the Dreamfleet Baron, but am not entirely happy with the flight dynamics, namely the high nose attitude in the latter stages of the approach. I was wondering whether their is any way to adopt the default Baron's flight dynamics - is it a matter of just using that air file, or will this introduce another range of complexities? Or is it possible to adjust the flight tuning parameters in the acft cfg?
Any help would be greatly appreciated.

Cheers

If the remaining flight characteristics are fine, you might adjust aircraft weight, flap lift or flap pitch scalar but would not adapt from a default MS aircraft cfg. In any case different power settings are required, so its a question how close the current cfg ist to the AOM. brgds Thomas
Click to expand...
 
Another thought.. Is the pitch wrong from outside? I believe Barons, like most all GA are slightly nose down on approach. If it looks right you may only need to change the view over the panel a little to see the runway.
 
Hi,

You can adjust your aircraft attitude when the flaps are used ..
You must edit the air file (section 1101) with airEdit .... (and it's work I experienced myself for fix some aircrafts with bad attitude when flaps down)
This is from a tutorial:

2yx3at3.jpg

http://hsors.pagesperso-orange.fr/fsairfile.html
 
Flap pitch moment is in the primary aerodynamics tab (1101) in the .air file. Positive number cause a nose down pitch. Typical value might be something like .005

T
 
Thanks guys. After a little more testing I think the main issue I have is a lack of nose down pitching moment after applying landing flap - there is little difference in deck angle between a flapless and full-flap approach. Claudius & Fliger - I have downloaded AirEd and I have a little bit of a tinker with those settings in the Air file, I'll let you know how I get on.
In case it sheds any more light I have added a copy of the flap parameters below from the acft cfg also - I'm wondering why the different entries for the flap system/lift/drag and pitch?

Cheers

Az

[flaps.0] //system
type=1
span-outboard=0.5
extending-time=8.0
system_type=0
flaps-position.0=0
flaps-position.1=50,152 //spec=15
flaps-position.2=100,122 //spec=30
damaging-speed=122
blowout-speed=160
lift_scalar=0.0
drag_scalar=0.0
pitch_scalar=0.0

[flaps.1] //lift
type=1
span-outboard=0.5
extending-time=8.0
system_type=0
flaps-position.0=0
flaps-position.1=15
flaps-position.2=30
damaging-speed =122
blowout-speed =160
lift_scalar=1.0
drag_scalar=0.0
pitch_scalar=0.0

[flaps.2] //drag & pitch
type=1
span-outboard=0.5
extending-time=8.0
system_type=0
flaps-position.0=0
flaps-position.1=12
flaps-position.2=30
damaging-speed =122
blowout-speed =160
lift_scalar=0.0
drag_scalar=1.0
pitch_scalar=1.0
 
Just a little update - after a bit of tinkering it appears that changing the flap pitch parameter increases the aircraft's pitch reaction to flap, although the final trimmed attitude remains unchanged. However, after increasing the flap lift setting (from 0.6 to 1) the aircraft now has a lower nose attitude with flap at a given airspeed. Not sure this is the most appropriate way of achieving it, but it seems to have worked. I also increased the flap drag a little which helps make it a little less slippery. Anyway, the end result is an aircraft that handles a bit more like I'd expect it to in the approach phase.

Thanks to everyone who provide inputs and advice.

Cheers

Az
 
I have often wondered why some simple aircraft models have multiple flap sections. Anyhoo, one thing not mentioned yet is that each of the parameters in the CFG typically affects many others. Changing the flap pitch usually means adjustments will be needed in drag, lift, then perhaps the dynamics of parasitic drag or thrust, and on and on all in an effort to make it more real. OOdles of fun as the hours melt away.
 
I was about to comment that the flap lift scalar might be the trick, as increasing the lift coefficent reduces the AOA needed for a given weight/airspeed.

T
 
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