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Performance upgrade... (Read 455 times)
Dec 14th, 2009 at 7:10am

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

Posts: 24861
*****
 
Hello Aircraft Designer Chums... Wink...!

If/when I wish to upgrade my standard little Cessna 150 Aerobat, Piper Cub, etc, with a slightly larger Lycoming/Continental motor, giving more power and speed for Aerobatic, etc, purposes.....assuming no problems with weight and balance... Roll Eyes....(possibly involving an Airspeed Gauge replacement)

Which particular entries in the "Aircraft.cfg" notepad file for the Aircraft require modifying to achieve this?..... Wink....!

...many thanks...Wink...!

Paul....G-BPLF....FS 2004....FS Navigator...(Additional fuel consumption no problem!... Kiss.... Wink......)... Cool...!

 

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Reply #1 - Dec 14th, 2009 at 7:33am

JakesF14   Offline
Colonel
Blistering Barnacles!
South Africa

Gender: male
Posts: 1866
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Paul, assuming you did'nt replace the piston engine with a jet or turboprop in your Cessna, you can play around with the bold parts:


[piston_engine]
power_scalar = 1.0                              //Piston power scalar
cylinder_displacement= 90.0                     //Cubic inches per cylinder
compression_ratio= 8.5                          //Compression ratio
number_of_cylinders=4                           //Number of cylinders
max_rated_rpm= 2700                             //Max rated RPM
max_rated_hp= 180                               //Max rated HP
fuel_metering_type= 0                           //0=Fuel Injected, 1=Gravity Carburetor, 2=Aerobatic Carburetor
cooling_type= 0                                 //0=Cooling type Air, 1=Cooling type Liquid
normalized_starter_torque= 0.3                  //Starter torque factor
turbocharged= 0                                 //Is it turbocharged? 0=FALSE, 1=TRUE
max_design_mp= 0                                //Max design manifold pressure, (inHg)
min_design_mp= 0                                //Min design manifold pressure, (inHg)
critical_altitude= 0                            //Altitude to which the turbocharger will provide max design manifold pressure (feet)
emergency_boost_type= 0                         //0=None, 1=Water Injection, 2=Methanol/Water injection, 3=War Emergency Power
emergency_boost_mp_offset= 0                    //Additional manifold pressure supplied by emergency boost
emergency_boost_gain_offset= 0                  //Multiplier on manifold pressure due to emergency boost
fuel_air_auto_mixture= 0                        //Automixture available? 0=FALSE, 1=TRUE
auto_ignition= 0                                //Auto-Ignition available? 0=FALSE, 1=TRUE
max_rpm_mechanical_efficiency_scalar= 1.0       //Scalar on maximum RPM mechanical efficiency
idle_rpm_mechanical_efficiency_scalar= 1.0      //Scalar on idle RPM mechanical efficiency
max_rpm_friction_scalar= 1.0                    //Scalar on maximum RPM friction
idle_rpm_friction_scalar= 1.0                   //Scalar on idle RPM friction

[propeller]
thrust_scalar = 1.0                             //Propeller thrust scalar
propeller_type= 1                               //0=Constant Speed, 1=Fixed Pitch
propeller_diameter= 6.3                         //Propeller Diameter, (feet)
propeller_blades= 2                             //Number of propeller blades
propeller_moi= 5.0                              //Propeller moment of inertia
beta_max= 0                                     //Maximum blade pitch angle for constant speed prop, (degrees)
beta_min= 0                                     //Minimum blade pitch angle for constant speed prop, (degrees)
min_gov_rpm= 0                                  //Miminum governed RPM
prop_tc= 0                                      //Prop time-constant
gear_reduction_ratio= 1.0                       //Propeller gear reduction ratio
fixed_pitch_beta= 20                            //Fixed pitch angle of fixed pitch prop, (degrees)
low_speed_theory_limit= 80                      //Speed at which low speed theory becomes blended in (feet/second)
prop_sync_available= 0                          //Prop synchronization available? 0=FALSE, 1=TRUE
prop_deice_available= 0                         //Prop de-icing available? 0=FALSE, 1=TRUE
prop_feathering_available= 0                    //Prop feathering available?  0=FALSE, 1=TRUE
prop_auto_feathering_available= 0               //Prop auto-feathering available?  0=FALSE, 1=TRUE
min_rpm_for_feather= 0                          //Minimum RPM for prop feathering
beta_feather= 0                                 //Feathering pitch angle (degrees)
power_absorbed_cf= 0                            //Coefficient of friction for power absorbed by propeller
defeathering_accumulators_available= 0          //Defeathering accumulators available? 0=FALSE, 1=TRUE
prop_reverse_available= 0                       //Prop reverse available?  0=FALSE, 1=TRUE
minimum_on_ground_beta= 0                       //Miminum pitch angle on ground, (degrees)
minimum_reverse_beta= 0                         //Minimum pitch angle in reverse, (degrees)

I am not an expert, and there could be more tweaks I dont know of, but this will give you a start. Also download the following word document. It explains all the data in the CFG file

http://www.filefront.com/1550949/Aircraft-Container-SDK/

Many happy aerobatics  Smiley

Jakes
 

...
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Reply #2 - Dec 14th, 2009 at 7:46am

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

Posts: 24861
*****
 
Ta, Jake....

...for the advice....a good start...will try it out...Wink...!

The Catapult with the elastic band wasn't very successful for increased Speed.....a very short term experiment... Cry....

Paul... Grin... Grin... Grin...!

...saved your File for reference...Wink...!

...the Firework Rockets didn't work either... Cry....!
 

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.
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Reply #3 - Dec 14th, 2009 at 8:05am

JakesF14   Offline
Colonel
Blistering Barnacles!
South Africa

Gender: male
Posts: 1866
*****
 
Fozzer wrote on Dec 14th, 2009 at 7:46am:
The Catapult with the elastic band wasn't very successful for increased Speed.....a very short term experiment... Cry....



You might consider the elastic band option for naval exersizes   hie hieee!   
...
 

...
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Reply #4 - Dec 14th, 2009 at 9:04am

Brett_Henderson   Offline
Colonel
EVERY OUTER MARKER SHOULD
BE AN NDB

Gender: male
Posts: 3593
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This is fun stuff..  and the only limits are your own, personal need to maintain realism.

Weight and CoG are proportionally  TOO  important on such a small airframe to do anything like simulating replacing the 4cyl engine, with a 6cyl engine.

The 150 came with the  O-200 (100hp) engine.. I'm sure you wouldn't be the first to strap a O-235 (112hp) engine in there. That was commom practice on early Tomahawks, as the engines are pretty close in size and weight.

NOW.. I've heard about people getting carried away and finding a way to put squeeze an O-320 in there (which can be rated as high as 200hp), but you're getting way too far outside of what the airframe was designed for..and it would be silly to have 200hp with a fixed-prop.. and that whole package would throw weight-n-balance too far out of whack, for it to be anything but a dare-devil's experiment.

If it were me, I'd just adjust the cgf entries and make it have an O-230.. but that's not going to be much of a performance increase.

You can push the limits of realism, and just paste the default C172 engine and prop paragraphs in there. I'm sure that's been done in real life.. but in reality, that would require cowl modifications to the exterior model.. so you'll have to overlook that. .. and all you'll end up with, is a cramped, 2-seat C172  .. that would be slightly faster than the regular 172  Cheesy

Another route to go.. would be to simulate your own mechanical skills.. for things like tuning exhaust systems, and polishing intakes. The best way to simulate this, would be to simply increase the engine's power scalar.. from 1.0 to something like 1.12

Anything much beyond this stuff.. and you might as well give it a jet engine.. heck make it two jet engines  Cheesy
 
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Reply #5 - Dec 14th, 2009 at 11:03am

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

Posts: 24861
*****
 
Ta , Brett...

Thanks for the input....Fascinating read... Smiley...!

What generated my interest in a spot of "power-boosting" was the highly aerobatic Piper Cub Video which Rotty Daddy posted a few days ago.... Wink...!

http://205.252.250.26/cgi-bin/yabb2/YaBB.pl?num=1259505486

I quickly found out that I could no-where near perform such outrageous maneuvers with the standard Piper Engine installed.... Sad...!
I found out after, that he had installed a larger engine to perform to the Crowds.....without endangering the airframe...(which I thought a bit surprising!... Shocked...Wink...)...!

Interestingly, my standard, lightweight, little Cessna 150 Aerobat (C150_v2), already has a surprising turn of speed as standard, (which it is why it is one of my favourite aircraft in my Hangar), with up to 140 knots cruise speed, properly trimmed, 1/2 a wing of fuel, with just lil' old me on board...(and a bit of a tail wind), to beat a Cessna 172, etc, to the post!.... Kiss...!

http://www.flightsim.com/file.php?cm=SEARCH1&fsec=0&fname=C150_V2.ZIP

She already "red-lines" on the old "speedo/knotmeter", bless her, so any increase in speed with a bigger motor would necessitate changing the Airspeed Gauge!... Grin...!

An interesting experiment in swapping engines, props, etc... Wink...!

Paul....G-BPLF...FS 2004.....and my Baby Cessna 150...>>> http://www.simviation.com/yabbuploads/mybabycessna.jpg
 

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.
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