teson1
August 28th, 2012, 14:29
Dear RW pilots.
I'm looking for information on engine CHT you observe during flight phases with your real-world planes (start_up, T/O, climb and cruise) to confirm accuracy/realism and tweak a model of CHT for piston engine aircraft I've coded.
-> I've compiled a questionnaire (see below) and would appreciate if you could enter your flight practices and CHT observed.
I'd appreciate if you could have a look and enter any information that you may have available (even if partial).
Just reply with quote and enter the information in the questionnaire, or send by PM to me.
Thanks !!!
The model is based on NACA Technical Note 1092 (1946)
"Flight investigation of the cooling characteristics of a two row radial engine installation I - Cooling corellation".
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930081717_1993081717.pdf
The module calculates the Cylinder Head Temperature CHT of a piston engine aircraft as a function of operating parameters:
- Power
- Mixture
- Cowl flap position
- Supercharger
- Airspeed
- Air temperature
High power operations like take-off and climb require care not to overheat the engine.
I believe this model is more realistic than the FS model of CHT.
However, as I have zero experience with RW aircraft I'm not sure whether it applies to all piston engine aircraft, and to what extent, or any at all, and whether the way I have configured planes is realistic in any way.
Thus I would appreciate if you could provide information on CHT you observe in the different flight phases with your planes.
If you would like to try out the CHT model and compare to behavior of your real plane you can download the beta of RealEngine v1.4 including the CHT module at the following place:
http://www.mediafire.com/file/6b2nbw9o6i4wv0p/RealEngine_v14_Beta1_120826.zip
(Installation instructions and suggestions on how to configure, as well as configuration files for a few airplanes are included).
I've come up with a relatively simple 4-step process to configure for an aircraft, but I'm not sure how realistic the outcome is.
Displaying the CHT value generated requires editing of CHT .xml gauges, or replacing these in the panel.cfg by supplied gauges, but this step is not very difficult I believe, and instructions are included with the readme.
Your support on real CHT in flight (as well as issues or suggestions for improvement) is highly appreciated!
Thanks!
Gunter
___________________________________________
Questionnaire:
1. Aircraft
Aircraft manufacturer/model):
Engine manufacturer/model/HP:
Comments regarding your airplane that may be of value with respect to CHT:
2. Run-up
What idle RPM are you using?
What temperatures does CHT reach during idle?
3. Take-Off
What engine settings do you use for T/O (MP/RPM or other)?
What mixture do you set for T/O (Mixture lever fully advanced?)?
Cowl flaps position (if available)?
What temperature does CHT reach during take-off run?
How fast does CHT rise during take-off run?
What is CHT limitation/redline for your engine during T/O?
4. Climb
What engine settings dou you use for climb (MP/RPM or power or other)?
What mixture do you set for climb?
Cowl flaps position (if available)?
What IAS do you climb at?
What temperature does CHT reach during climb?
5. Cruise
What engine settings dou you use for cruise (MP/RPM or power or other)?
What mixture do you set for cruise?
What IAS do you cruise at?
Please indicate typical cruise altitude.
What temperature does CHT reach during cruise?
What is CHT limitation/redline for your engine during cruise/continuous operation?
How fast does CHT settle to a new value after changing cruise parameters (MP/RPM/power)?
6. Any special observations regarding behavior of CHT in your plane?
Notes:
I am aware that there are many different practices possible depending on flight requirements. Any information you may have is highly appreciated.
Ideally please indicate temperatures and operating parameters ect for a low-level take-off and roughly ICAO atmospheric conditions, but any information you may have are willing to share will be helpful.
Thanks !!
I'm looking for information on engine CHT you observe during flight phases with your real-world planes (start_up, T/O, climb and cruise) to confirm accuracy/realism and tweak a model of CHT for piston engine aircraft I've coded.
-> I've compiled a questionnaire (see below) and would appreciate if you could enter your flight practices and CHT observed.
I'd appreciate if you could have a look and enter any information that you may have available (even if partial).
Just reply with quote and enter the information in the questionnaire, or send by PM to me.
Thanks !!!
The model is based on NACA Technical Note 1092 (1946)
"Flight investigation of the cooling characteristics of a two row radial engine installation I - Cooling corellation".
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930081717_1993081717.pdf
The module calculates the Cylinder Head Temperature CHT of a piston engine aircraft as a function of operating parameters:
- Power
- Mixture
- Cowl flap position
- Supercharger
- Airspeed
- Air temperature
High power operations like take-off and climb require care not to overheat the engine.
I believe this model is more realistic than the FS model of CHT.
However, as I have zero experience with RW aircraft I'm not sure whether it applies to all piston engine aircraft, and to what extent, or any at all, and whether the way I have configured planes is realistic in any way.
Thus I would appreciate if you could provide information on CHT you observe in the different flight phases with your planes.
If you would like to try out the CHT model and compare to behavior of your real plane you can download the beta of RealEngine v1.4 including the CHT module at the following place:
http://www.mediafire.com/file/6b2nbw9o6i4wv0p/RealEngine_v14_Beta1_120826.zip
(Installation instructions and suggestions on how to configure, as well as configuration files for a few airplanes are included).
I've come up with a relatively simple 4-step process to configure for an aircraft, but I'm not sure how realistic the outcome is.
Displaying the CHT value generated requires editing of CHT .xml gauges, or replacing these in the panel.cfg by supplied gauges, but this step is not very difficult I believe, and instructions are included with the readme.
Your support on real CHT in flight (as well as issues or suggestions for improvement) is highly appreciated!
Thanks!
Gunter
___________________________________________
Questionnaire:
1. Aircraft
Aircraft manufacturer/model):
Engine manufacturer/model/HP:
Comments regarding your airplane that may be of value with respect to CHT:
2. Run-up
What idle RPM are you using?
What temperatures does CHT reach during idle?
3. Take-Off
What engine settings do you use for T/O (MP/RPM or other)?
What mixture do you set for T/O (Mixture lever fully advanced?)?
Cowl flaps position (if available)?
What temperature does CHT reach during take-off run?
How fast does CHT rise during take-off run?
What is CHT limitation/redline for your engine during T/O?
4. Climb
What engine settings dou you use for climb (MP/RPM or power or other)?
What mixture do you set for climb?
Cowl flaps position (if available)?
What IAS do you climb at?
What temperature does CHT reach during climb?
5. Cruise
What engine settings dou you use for cruise (MP/RPM or power or other)?
What mixture do you set for cruise?
What IAS do you cruise at?
Please indicate typical cruise altitude.
What temperature does CHT reach during cruise?
What is CHT limitation/redline for your engine during cruise/continuous operation?
How fast does CHT settle to a new value after changing cruise parameters (MP/RPM/power)?
6. Any special observations regarding behavior of CHT in your plane?
Notes:
I am aware that there are many different practices possible depending on flight requirements. Any information you may have is highly appreciated.
Ideally please indicate temperatures and operating parameters ect for a low-level take-off and roughly ICAO atmospheric conditions, but any information you may have are willing to share will be helpful.
Thanks !!