SF2 Atlas Impala Mk.II by Marcfighters V2

[+Crusader]

Right, offsets require adjustments. Just rushed it a bit yesterday..

 

[+Cliff7600]

11 hours ago, Crusader said:

Just rushed it a bit

 

You're not the only one ^^
Me, ...but some colleagues as well 

A new temporary data.ini to reduce the pitch up tendency

Impala2_more_leveled.rar

- Flaps induce pitch down (very slight)
- XacMachTableData within the shape of the 3D model (same values, 20 cm further)
- Horizontal Stabs down force reduced (Cl0)

Still a temporary fix, barely tested.

[+baffmeister]

Still too busy to do anything with this, maybe on the weekend. Some areas I was looking at that need edits were wing area, empty weight, and engine thrust. Not 100% sure which version of the Viper turbojet was used but anecdotal info indicates about 3500lbs ST or about 4000lbs ST, depending on source. More definitive info appreciated.

Regarding the pitch up tendency, sometimes I can fix that by editing the H-Stab CL0/CLA tables at the appropriate mach number but it's a hit or miss affair. Will definitely check out all the latest updates prior to proceeding.

[+Cliff7600]

51 minutes ago, baffmeister said:

Regarding the pitch up tendency

A simple swap of Cl0 / Cla (Wings / Outerwings / H-Stabs) values with the MachTableDatas borrowed from another plane fixes the problem.
Needs fine tuning then, but it saves a lot of time.
In fact, all the original values were just too strong.

And moving the horizontal stabs Xac values within the 3D model doesn't waste the whole FM, add -0.2 to each and there's no real difference. It saves a lot of time too.

[madvad]

I have read all the posts, and I have seen that they have reported the problem of lateral instability.
I also noticed that the right wing aileron does not work visually.
Thanks for everyone's suggestions, I'll wait for the definitive version to fix on my files =)

[+Crusader]

wingtip fueltank ID's, right tiptank is #3 , should be #2 same as left tiptank so that both are used simultaneously

FuelAmount values should be (according to the flight manual)

803.0 kg for both fuselage cells combined (data FuelTankID=1)

238.0 kg for each tiptank

 

more things to update, cannons shells ejection positions, delete internal ECM jammer, flare dispenser is in the wings, close to the gear covers, firing downwards (have pics somewhere..)

 

[+Crusader]

Cant find the saved pics but theres a aircraftresourcecenter.com model gallery

which show the dispensers

[+Crusader]

Photos on wargametechnology.weebly.com

[+Crusader]

Delete the ChaffDispenser system from [Fuselage] 

Add

[LeftWing]

...

SystemName[007]=LeftWingChaffDispenser

 

 

[RightWing]

...

SystemName[007]=RightWingChaffDispenser

 

and update

// Countermeasures ----------------------------------------------------

[LeftWingChaffDispenser]
SystemType=DECOY_DISPENSER
EjectPosition=-1.30,-1.0,-0.10
EjectVelocity=0.00,0.00,-10.00
NumChaff=0
NumFlare=16

[RightWingChaffDispenser]
SystemType=DECOY_DISPENSER
EjectPosition=1.30,-1.0,-0.10
EjectVelocity=0.00,0.00,-10.00
NumChaff=32
NumFlare=0

 

Loading both dispensers with 16x flares each is probably more accurate.. but adjust to own preference :)

[+Crusader]

Updated gun sections with shell ejection positions:

// Internal Guns ---------------------------------------------------------

[LeftGun01]
SystemType=FIXED_GUN
GunTypeName=30MM_DEFA553
InputName=FIRE_PRIMARY_GUN
MuzzlePosition=-0.34,2.75,-0.30
LightPosition= -0.34,2.75,-0.30
MaxAmmo=150
EjectShells=TRUE
EjectPosition=-0.44,0.640,-0.340
EjectVelocity=-1.0,-6.0,-2.0
MinExtentPosition=-0.49,0.55,-0.42
MaxExtentPosition=-0.25,2.61,-0.22

[RightGun01]
SystemType=FIXED_GUN
GunTypeName=30MM_DEFA553
InputName=FIRE_PRIMARY_GUN
MuzzlePosition=0.34,2.75,-0.30
LightPosition= 0.34,2.75,-0.32
MaxAmmo=150
EjectShells=TRUE
EjectPosition=0.44,0.640,-0.340
EjectVelocity=1.0,-6.0,-2.0
MinExtentPosition=0.25,0.55,-0.42
MaxExtentPosition=0.49,2.61,-0.22

[+Cliff7600]

15 hours ago, Crusader said:

wingtip fueltank ID's, right tiptank is #3 , should be #2 same as left tiptank so that both are used simultaneously

Just a question : how do you know that the FuelTankID number gives a hierarchy between the tanks (in the game) ?

[+Crusader]

Re: FuelTankID

TK in TW forums, he has explained it many years ago

 

And re: C/F dispensers:

This modification came in 1987 or later.

Calls for a subvariant a la TW style,  e.g. ImpalaMkII_87

[+Wrench]

great work guys!

like it said in the read me, I did what I could to get it out to all of you, to make whatever adjustments are/were needed. However, it there's anything that can't be fixed by ini work (model flaws, incorrect animations), we're stuck with those!

All I ask is that when all is said and done, and you have a final version(s) you upload the changed items, and then I can update the entire package!

I like Otto's suggestion of the _87 model! Didn't think of that!

thanks again guys!! 

[+Crusader]

New loadout image ImpalaMkII_Loadout.zip

- change file extension to TGA in ImpalaMkII ini

- to make the pylons on the image line up with the station lines, change ReferenceSpan to 9.4 in data ini

Thats the actual size of the lod.. a bit short of the real size

[+Crusader]

RightOuterWing section has faulty lines, that disables the right aileron/vortex/navlight

[+Wrench]

So, what's the fix???

What I did just now, is move the 2 outer wing components BACK to the RightWing, and commented them out of the RightOuterWing. As both outer wing 'sections' exist only as data statements for the FM, perhaps the best fix is simply to move any components (yes, I know the left side works -this points me to a probably LOD issue) from the outer wings to the "main" wing sections (RightWing, LeftWing), leaving the outer wings as only FM statements?

[+Crusader]

Use mouse cursor and backspace to re-align the entries and offset line spaces... or simply copy/paste my fixed RightOuterWing section over the faulty section

[RightOuterWing]
ParentComponentName=RightWing
ModelNodeName=
ShowFromCockpit=TRUE
DetachWhenDestroyed=TRUE
DamageRating=DISABLED
MassFraction=0.066
HasAeroCoefficients=TRUE
LiftSurface=TRUE
CL0=0.0330
CLa=1.1675
CD0=0.0009
CDL=0.0052
Cmq=-0.0151
Cmad=0.5244
Cyb=-0.0038
Clb=-0.0184
Clp=-0.1596
Clr=0.0160
Cnp=-0.0021
Cnr=-0.0413
CL0MachTableNumData=11
CL0MachTableDeltaX=0.10
CL0MachTableStartX=0.00
CL0MachTableData=0.927,0.931,0.944,0.966,1.000,1.049,1.118,1.219,1.373,1.633,2.029
CLaMachTableNumData=11
CLaMachTableDeltaX=0.10
CLaMachTableStartX=0.00
CLaMachTableData=0.927,0.931,0.944,0.966,1.000,1.049,1.118,1.219,1.373,1.633,2.029
CD0MachTableNumData=11
CD0MachTableDeltaX=0.10
CD0MachTableStartX=0.00
CD0MachTableData=2.106,1.246,1.092,1.031,1.000,0.978,0.957,0.972,0.993,1.045,9.549
CDLAlphaTableNumData=15
CDLAlphaTableDeltaX=4.00
CDLAlphaTableStartX=-28.00
CDLAlphaTableData=22.014,15.844,10.686,6.541,3.408,1.287,0.179,0.083,1.000,2.929,5.871,9.825,14.791,20.770,27.762
CmqMachTableNumData=11
CmqMachTableDeltaX=0.10
CmqMachTableStartX=0.00
CmqMachTableData=0.832,0.837,0.869,0.919,1.000,1.127,1.333,1.696,2.460,4.888,22.222
ClbAlphaTableNumData=37
ClbAlphaTableDeltaX=10.00
ClbAlphaTableStartX=-180.00
ClbAlphaTableData=1.205,1.241,1.345,1.506,1.702,1.912,2.108,2.268,2.373,2.205,1.970,1.883,1.750,1.587,1.413,1.250,1.117,1.030,1.000,4.000,6.000,7.765,6.824,7.765,6.353,3.647,6.118,4.409,3.577,2.870,2.108,1.912,1.702,1.506,1.345,1.241,1.205
CnrAlphaTableNumData=37
CnrAlphaTableDeltaX=10.00
CnrAlphaTableStartX=-180.00
CnrAlphaTableData=0.000,0.004,0.015,0.034,0.060,0.094,0.134,0.181,0.234,0.293,0.357,0.426,0.500,0.577,0.658,0.741,0.826,0.913,1.000,0.913,0.826,0.741,0.658,0.577,0.500,0.426,0.357,0.293,0.234,0.181,0.134,0.094,0.060,0.034,0.015,0.004,0.000
XacMachTableNumData=11
XacMachTableDeltaX=0.10
XacMachTableStartX=0.00
XacMachTableData=0.098,0.098,0.097,0.095,0.092,0.089,0.086,0.082,0.092,0.109,0.149
CheckStall=TRUE
CLmax=0.3012
AlphaStall=11.05
AlphaMax=16.45
AlphaDepart=20.45
StallMoment=-0.000
StallDrag=0.001
StallLiftTableNumData=37
StallLiftTableDeltaX=10.00
StallLiftTableStartX=-180.00
StallLiftTableData=0.000,-0.012,-0.026,-0.042,-0.057,-0.053,-0.046,-0.031,-0.013,0.000,0.017,0.049,0.093,0.138,0.200,0.241,0.336,0.524,0.891,0.578,0.357,0.261,0.208,0.165,0.117,0.073,0.037,0.000,-0.013,-0.031,-0.046,-0.053,-0.057,-0.042,-0.026,-0.012,0.000
StallDragTableNumData=37
StallDragTableDeltaX=10.00
StallDragTableStartX=-180.00
StallDragTableData=0.001,0.008,0.021,0.043,0.082,0.123,0.171,0.227,0.292,0.367,0.451,0.562,0.689,0.825,0.937,1.018,1.142,1.122,1.000,1.122,1.142,1.018,0.937,0.825,0.689,0.562,0.451,0.367,0.292,0.227,0.171,0.123,0.082,0.043,0.021,0.008,0.001
StallXacShiftTableNumData=37
StallXacShiftTableDeltaX=10.00
StallXacShiftTableStartX=-180.00
StallXacShiftTableData=-0.580,-0.580,-0.496,-0.446,-0.441,-0.424,-0.394,-0.363,-0.321,-0.290,-0.259,-0.217,-0.186,-0.156,-0.139,-0.134,-0.084,0.000,0.000,0.000,-0.084,-0.134,-0.139,-0.156,-0.186,-0.217,-0.259,-0.290,-0.321,-0.363,-0.394,-0.424,-0.441,-0.446,-0.496,-0.580,-0.580
Chord=1.55
Ymac=4.61
MinExtentPosition=
MaxExtentPosition=   
CollisionPoint[001]=
CollisionPoint[002]=
HasVortexEmitter=TRUE
VortexEmitterName=WingtipVortexEmitter
VortexPosition= 4.755,-1.09, 0.22
VortexG=2.5
SystemName[001]=RightAileron
SystemName[002]=RightPositionLight
HasArmor=TRUE
ArmorMaterial=Aluminium
Armor[TOP].Thickness=2
Armor[BOTTOM].Thickness=2

 

 

Another small typo fix

[RightWingFuelCell]
...
MinExtentPosition=4.40,-3.70,-0.07

should be
MinExtentPosition=4.40,-3.07,-0.07

[+Crusader]

web-archive link to IPMSSA Impala article

Pages 1 to 3 cover MkI, pages 4-5 MkII

MkII serials, the first was 1000 .. with 100 ac to 1099

 

[+baffmeister]

On 3/31/2019 at 5:57 PM, Crusader said:

803.0 kg for both fuselage cells combined (data FuelTankID=1)

Crusader, did you find an actual Mk-2 flight manual somewhere?  I found 1341lbs/608.27kg for the two fuselage cells on an Australian Mk-1. Maybe the Mk-2 got an extended tank with the removal of the back seat?

Never mind, your linked article explained it in the first paragraph!

Edited April 6, 2019 by baffmeister
Should have read linked article first.

[+Menrva]

Any update, people? There's so many fragmented updates by Cliff7600 and Crusader, in this thread. I wonder if someone properly updated the package. I had also remade the skins, available in the first page.

[Wilches]

28 minutes ago, Menrva said:

Any update, people? There's so many fragmented updates by Cliff7600 and Crusader, in this thread. I wonder if someone properly updated the package. I had also remade the skins, available in the first page.

Second that...

[+Wrench]

when we get 'round to it. Baff was working on a updated FM, some months ago, but Real Life (tm) intervened.

Be paitent

[+baffmeister]

Yep. Real life but you can also add some really annoying pitch stability issues I was encountering plus other projects plus summertime.

Public beta test FM attached. Hopefully I can finish this thing in October. The pitch stability issues can still show up but I don't think it's any worse than ThirdWire's Vampire which has a similar issue. At certain speeds, if you give the stick a large displacement forward or back, the plane will just continue climbing or descending and not return to level flight on it's own. I spent a lot of time balancing the tail with the auto trim turned off [AutoTrimLimit=0.0] and noticed it doesn't exhibit the odd behavior with auto trim off.  At present I have the auto trim set to a minimal level of 0.15 but it's still enough to get the pitch instability at certain speeds. Anyway, the FM still needs some testing/improvements but will post it here for public testing: ImpalaMkII_DATA0.95.zip

NOTE: The Impala has surprisingly large weight ratings for the weapon pylons but in real life, anything over about 1600lbs of racks/weapons would have required a reduction in fuel to stay under the 12000lb MTOW.

[Wilches]

Sily question - this new FM has all the tweaks showed above?

[+baffmeister]

23 minutes ago, Wilches said:

Sily question - this new FM has all the tweaks showed above?

Possibly not. I think I added some of Cliffs gear tweaks but much, maybe most, is original. I did get a look at an Impala flight manual so adjusted the gear and flap speeds, empty weights, fuel capacities etc.  Also had a look at some performance charts to try and match sustained and instantaneous G but it still needs fine tuning.