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FSXA Recip. engine - starter motor

Vitus

Vitus

Resource contributor
Messages
1,480
Country
newzealand
Hi there,

this issue is sooooooooo annoying and I hope you can help me solving it. My engine starters seem to be too powerful. When activating the starters, the rpm quickly rises to about 1500 r.p.m. sometimes causing the aircraft to flip and turn and tumble and... crash.
Is there a way to reduce the starting rpm to lets say 500?

All the best,
Vitus
 
Moin moin, Vitus!

Do you mean idle rpm? In this case there are a couple parameters to play with: the propeller_MOI, the idle_rpm_friction_scalar, and the idle_rpm_mechanical_efficiency_scalar in the aircraft.cfg. You can adjust mechanical efficiency and friction within the air file too.
And there is still the possibility to manipulate the min_throttle_limit, as Bill described in this forum (if I remember correctly).

Ciao, Sergio
 
Ciao Sergio!

At 0 throttle the engine idles at ~500 rpm which is fine because you need to advance the throttle a bit to keep a normal idling speed of 1000 rpm.

But when the starter is engaged the rpm quickly peaks up to 1500 producing a massive MOI. I found the entry "normalized_starter_torque" in the aircraft.cfg which doesn't seem to have any effect at all.

I will try your tips! I just hope that this doesn't affect the well-balanced power setting of my engines ;)

Cheers,
Vitus
 
First update:
I changed the propeller_moi to 2 instead of 14.1 with the effect that the aircraft doesn't jump anymore! Very good.
Unfortunately, the starting rpm still doesn't make sense - the same ~1500 rpm. How can I lower it?

Vitus
 
Hi Mate
FSX saves the throttle position in the saved senerio,which may not be at zero when you first start up the sim unless you move the throttle back and forth to reset it.I hate hot starts with no brakes on ;)
Also play with the normalized_starter_torque= in the aircraft.cfg
to high a number and the engine will spin the prop into the next year,to little and it wont start using the normal startup toggle.
its a balance game with the above and the prop moi
more moi slower to start and run down and a larger effect on the flight model
less moi the op happens.As a rule of the thumb what I do is time some vids of engine shutdown of similar real world aircraft/engine the adjust the prop moi till the blades stop in aprox same time,then alter the normalized_starter_torque= till the engine wont start then up it a tad.Not very tech but it works 92.356% of the time :D
Wozza
 
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