• There seems to be an uptick in Political comments in recent months. Those of us who are long time members of the site know that Political and Religious content has been banned for years. Nothing has changed. Please leave all political and religious comments out of the forums.

    If you recently joined the forums you were not presented with this restriction in the terms of service. This was due to a conversion error when we went from vBulletin to Xenforo. We have updated our terms of service to reflect these corrections.

    Please note any post refering to a politician will be considered political even if it is intended to be humor. Our experience is these topics have a way of dividing the forums and causing deep resentment among members. It is a poison to the community. We appreciate compliance with the rules.

    The Staff of SOH

  • Server side Maintenance is done. We still have an update to the forum software to run but that one will have to wait for a better time.

Throttle setting and power...C-141

O

OBIO

Retired SOH Admin
Been tinkering around with and flying the freeware Alphasim C-141. Got the fuel load set to real specs, got all the lights to work, working on the payload configurations, tweaking the 2D and VC panels, putting together a paint template for the bird.

Anyhow....with the engines running and throttle pulled all the way back to zilch, the engine power gauges read at 60%. It takes just a crack of the throttle, maybe 20%, to get the power up to 80%. Another small nudge and it is at 100%....and the throttle is barely at 50% of its movement.

This makes taxiing the plane at a decent rate a bit hard, and makes Over Speeding the plane a difficult thing to avoid (it is better now that I adjusted the max speed from the rediculously low 330 knots it was originally set as to the realistic 493 knots). This allows the plane to cruise at 380 knots instead of 275 knots (at 80% power)...need to check where the thottle/power level is at for the realistic cruise speed of 440 knots.

Anyhow #2: Is this throttle vs power level realistic? If not what should it be and how can I adjust it without totally destroying the flight dynamics of this bird?

OBIO
 
OBIO said:
Been tinkering around with and flying the freeware Alphasim C-141. Got the fuel load set to real specs, got all the lights to work, working on the payload configurations, tweaking the 2D and VC panels, putting together a paint template for the bird.

Anyhow....with the engines running and throttle pulled all the way back to zilch, the engine power gauges read at 60%. It takes just a crack of the throttle, maybe 20%, to get the power up to 80%. Another small nudge and it is at 100%....and the throttle is barely at 50% of its movement.

This makes taxiing the plane at a decent rate a bit hard, and makes Over Speeding the plane a difficult thing to avoid (it is better now that I adjusted the max speed from the rediculously low 330 knots it was originally set as to the realistic 493 knots). This allows the plane to cruise at 380 knots instead of 275 knots (at 80% power)...need to check where the thottle/power level is at for the realistic cruise speed of 440 knots.

Anyhow #2: Is this throttle vs power level realistic? If not what should it be and how can I adjust it without totally destroying the flight dynamics of this bird?

OBIO
Click to expand...

Most GE jet engines in the military idle around 45-50%
 
Off hand the 330 knots is probably a reasonable VMO for this aircraft as it is an indicated speed. At altitude this might work out to something like 500 kts TAS.

What sim is this for?

Cheers: T
 
I just took a peek and saw that that is one I never tweaked. I can make it fly more realistically but can't help a whit with getting performance to agree with the gauges. Good luck with your efforts.
I don't know if it helps but I adjust the [TurbineEngineData]
fuel_flow_gain=0.002 value to get better RPM response. Don't know if this shows up as RPM gauge or not.
 
You must log in or register to reply here.
Back
Top