Re: [Jsbsim-devel] F-35 VTOL Engine Modeling

[Alan T. <ajt...@v-...>]

From: Sean McLeod 
Sent: Saturday, April 21, 2018 7:56 AM
To: Development issues 
Subject: Re: [Jsbsim-devel] F-35 VTOL Engine Modeling

Hi Alan

 

“I have just done this with my WIP and it seemed to have the desired effect.”

 

Yep, that’s why I was wondering why the F-22 model doesn’t use it.

 

How do you go about reducing the main thrust once you’ve calculated the loss due to flap blowing?

 

Do you tweak the throttle command going to the engine or is the max thrust in the engine file a property that you change during flight by subtracting the loss from flap blowing from it?

 

<turbine_engine name="CFM56">

  <milthrust> 20000.0 </milthrust>

 

Cheers

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P.S.

These lines from the engine file are also relevant.

 

turbine_engine name="Olympus B01.22R">
   <!-- If milthrust or maxthrust are changed, also make corresponding changes in TSR2-Engines.nas and TSR2_aero.xml -->
    <milthrust> 19610.0 </milthrust>
    <maxthrust> 30610.0 </maxthrust>

    <bleed>           0.0</bleed> <!-- not used - thrust loss due to bleed is set using flap blow table in TSR2_aero.xml –>

Alan
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