Problem with Condition lever in YASim turbine engine

Lee Elliott <[email protected]> Sat, 21 May 2005 10:14:28 +0100
Newsgroups gmane.games.flightgear.flightmodel
Message-ID <[email protected]>
Hello all,

I'm having problems with the condition lever in the YASim config 
for the TU-114 I'm working on.

I've got a YASim config that solves and flies but if I try to 
include the condition lever control the stand-alone YASim solver 
appears to loop.

I've referred to the B1900d and Beech99 configs to check how it 
should be done and found that while both solve the B1900d 
produces the following O/P:

Solution results:       Iterations: 1
 Drag Coefficient: 1000.000000
       Lift Ratio: 1.000000
       Cruise AoA: 0.000000
   Tail Incidence: -0.000000
Approach Elevator: 0.000000
               CG: -0.102, -0.000, -0.113

which doesn't look right.

The Beech99 solves with reasonable results though:

Solution results:       Iterations: 939
 Drag Coefficient: 9.960947
       Lift Ratio: 162.950500
       Cruise AoA: -0.763730
   Tail Incidence: -1.993015
Approach Elevator: -0.733107
               CG: -5.704, 0.014, 0.278

I haven't looked much further into these configs other than to 
check for stuff relevant to the condition lever but I still 
haven't found why I'm getting looping with the TU-114 when 
condition levers are defined.

I don't know much about flying turbine engines and there's a lot 
of guestimation values in the config so I figure that I must be 
asking the solver to do something impossible.

I've put a copy on the config up at

www.overthetop.freeserve.co.uk/TU-114-yasim.tar.gz

and I'd appreciate it if someone could take a look and figure out 
where the problem is.

TIA

LeeE

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