Re: [Jsbsim-devel] Throttle Command has no effect on piston engine

[Ron J. <wi...@je...>]

On Thu, 2010-01-14 at 11:32 +0000, Linares Antonin wrote:
> Hi Ron,
> 
> I take a look to Manifold pressure and throttle pos:
> The throttle Pos evolves with the throttle Commande.
> The Manifold pressure keep constant and exceeds the max define in the
> engine file (28.5) :s
> Ambient Air Pressure and Ram Air Pressure seems normale (2017.262607 and
> 2047.809444), Dt set to 1/20

2017 lbf/ft2 is 28.5 inHg and 2048 lbf/ft2 is 28.9 inHg.  Neither the
IO360 or the IO470 are boosted so the engine manifold pressure should
never exceed 

> I try to log the almost of FGpiston and FGPropeller:
> ****************************************** Full Throttle
> FCS Throttle Position 0 : 0.989255
> Piston 0 : Manifold Pressure : 29.921218
> Piston 0 : Power : 12436.933121
> Piston 0 : Running : yes
> Piston 0 : Trotlle : 0.989255
> Piston 0 : Cranking : no
> Piston 0 : Starter : no
> Piston 0 : Mixture : 0.800000
> Piston 0 : RPM : 2300.000000
> Piston 0 : CylinderHeadTemp : 59.270000
> Piston 0 : ExhaustGasTemp : 664.265856
> Piston 0 : FuelFlow_gph : 11.658014
> Piston 0 : OilPressure_psi : 77.462500
> Piston 0 : getOilTemp_degF : 59.270000
> Piston 0 : EGT : 15.150000
> Propeller  0 : RPM 2300.000000
> Propeller  0 : Thrust 262.036103
> Propeller  0 : torque -201.008071
> Propeller  0 : feathered no
> 
> 
> 
> ****************************************** Low Throttle
> FCS Throttle Position 0 : 0.235897
> Piston 0 : Manifold Pressure : 29.921218
> Piston 0 : Power : 12420.395582
> Piston 0 : Running : yes
> Piston 0 : Trotlle : 0.235897
> Piston 0 : Trotlle Max : 1.000000
> Piston 0 : Cranking : no
> Piston 0 : Starter : no
> Piston 0 : Mixture : 0.800000
> Piston 0 : RPM : 2300.000000
> Piston 0 : CylinderHeadTemp : 59.270000
> Piston 0 : ExhaustGasTemp : 664.267549
> Piston 0 : FuelFlow_gph : 11.658421
> Piston 0 : OilPressure_psi : 77.462500
> Piston 0 : getOilTemp_degF : 59.270000
> Piston 0 : EGT : 15.150000
> Propeller  0 : RPM 2300.000000
> Propeller  0 : Thrust 262.229034
> Propeller  0 : torque -201.093998
> Propeller  0 : feathered no
> ******************************************

What does FGPiston::Debug(0) print out? 

> Maybe you can see what's wrong.
> I continue my investigate, i can post my code it isn't so long.
> 
> Great Thanks !

Yes, the code that doesn't work may help me spot the problem.

V/r

Ron