Important problem for fuel burning and flight range

[Batmann]

AH fuel burning model include a important problem for long range flight. It may be needed a little knowledge to understand it. I explain it.

How should we fly for long range?[list=1]

• Slow speed[/b]
  Best speed is to make drag be minimum. It is faster only a little than in the stall speed. Big drag makes losing fuel more. Minimum drag speed need minimum engine power. Minimum engine power need minimum fuel burning.
  
  • Low engine speed[/b]
    There are 2 ways to reduce engine power.
    [/list=a]
    [list=a]
    • Reduce throttle[/b]
      Reducing throlle makes to reduce intake manifold pressure. It makes to reduce engine power and fuel burning.
      
      • Reduce engine speed by increasing propeller pitch[/b]
        Even if you don't move throttle, you can reduce engine power. Increase propeller pitch. Increasing propeller pitch makes to reduce engine power and fuel burning.
        [/list=a]
        Which is vest way to get optimum engine power?[list=1]
      • Minimum throttle and high engine speed
      • Minimum engine speed and high throttle
      [/list=a]
      
      Best way is Minimum engin speed and high throttle!
      
      It burn lesser fuel. Why? Imagine running by car. Which best way to run 25mph by 1st gear or top gear? Reducing engine speed is most important to less fuel burning.
      
      The explanation of basic knowledge is here. Let's go next step. What is a important problem about AH fuel burning?
      
      Reducing engine speed makes reduce engine power, but not reduce fuel burning in AH.
      So, If you increase propeller pitch for long range flight, only the shorter distance has become able to fly. It becomes a completely opposite result.
      
      I researched what becoming flight range by changing throttle or propeller pitch in AH.
      Using Fw190A-5, load 25% fuel, fuel burning rate 10.0 and taking off from MED terrain A18 field and go straight to South by sea level. These figures show the spot which the engine stopped at.
      
                 Full throttle WEP ON
                 Full throttle WEP OFF
      
      Using WEP gives no change to fuel burning in AH. So, distance becomes increase because using WEP is faster. I doubt it is not right really.
      
                Reducing throttle to intake manifold pressure 30
         Reducing throttle to intake manifold pressure 20
      
      Less intake manifold pressure makes less fuel burning. That's right.
      
                 Full throttle and reduce engine speed minimum
      
      Less engine speed gives no change to fuel burning. So, distance becomes decrease because reducing engine power makes slower speed. That's wrong clearly.
      
      I wish HTC fix fuel burning model for realistic flight.
      
      Regards.
      
      
      ------------------
      Batmann <CO/JG68> from Tokyo, Japan
      JG68 Briefing Room
      Far East Special Scnario Event
      
      
      [This message has been edited by Batmann (edited 12-09-2000).]

[Batmann]

 

[This message has been edited by Batmann (edited 12-09-2000).]

[Zigrat]

yep batmann is right, engine modeling definitely needs improvement!

[scout]

You're wrong, I dont think low pitch, max thottle should give best range.

It should be low throttle, low pitch.


[Edited after thinking about it some more ...]


[This message has been edited by scout (edited 12-10-2000).]

[funked]

 http://bbs.hitechcreations.com/smf/Smileys/default/Forum9/HTML/000801.html

[SFRT - Frenchy]

Low RPM (prop speed for the non pilots) and high Manifold pressure is the best way to blow up an engine in a real aircraft without a gear box guys  

[SFRT - Frenchy]

 

Slow speed
Best speed is to make drag be minimum. It is faster only a little than in the stall speed. Big drag makes losing fuel more. Minimum drag speed need minimum engine power. Minimum engine power need minimum fuel burning.

oh and minimum drag is minimum total drag, wich is not at slow speed (induced drag Vs parasite drag stuff). If I recall good, min total drag is at "L/D max", wich gives you best endurance.

And where's my mixture control?

[funked]

Frenchy read the thread that I linked to.  I'm using RPM/M.P. combinations from the Fw 190A-8 pilot's manual and Batman is correct.  The relationship between M.P., RPM, fuel consumption, airspeed, and thrust is not right.

[senna]

In real life, pilots used to try to open up manifold pressure/boost as much as possible while leaning out the mixture as much as possible to maintaining the necessary airspeed for their cruise along the way to the target or combat zone.  Geese what a runon sentence  

-- senna


 

Originally posted by Batmann:
AH fuel burning model include a important problem for long range flight. It may be needed a little knowledge to understand it. I explain it.

How should we fly for long range?[list=1]

• Slow speed[/b]
  Best speed is to make drag be minimum. It is faster only a little than in the stall speed. Big drag makes losing fuel more. Minimum drag speed need minimum engine power. Minimum engine power need minimum fuel burning.
  
  • Low engine speed[/b]
    There are 2 ways to reduce engine power.
    [/list=a]
    [list=a]
    • Reduce throttle[/b]
      Reducing throlle makes to reduce intake manifold pressure. It makes to reduce engine power and fuel burning.
      
      • Reduce engine speed by increasing propeller pitch[/b]
        Even if you don't move throttle, you can reduce engine power. Increase propeller pitch. Increasing propeller pitch makes to reduce engine power and fuel burning.
        [/list=a]
        Which is vest way to get optimum engine power?[list=1]
      • Minimum throttle and high engine speed
      • Minimum engine speed and high throttle
      [/list=a]
      
      Best way is Minimum engin speed and high throttle!
      
      It burn lesser fuel. Why? Imagine running by car. Which best way to run 25mph by 1st gear or top gear? Reducing engine speed is most important to less fuel burning.
      
      The explanation of basic knowledge is here. Let's go next step. What is a important problem about AH fuel burning?
      
      Reducing engine speed makes reduce engine power, but not reduce fuel burning in AH.
      So, If you increase propeller pitch for long range flight, only the shorter distance has become able to fly. It becomes a completely opposite result.
      
      I researched what becoming flight range by changing throttle or propeller pitch in AH.
      Using Fw190A-5, load 25% fuel, fuel burning rate 10.0 and taking off from MED terrain A18 field and go straight to South by sea level. These figures show the spot which the engine stopped at.
      
                  Full throttle WEP ON
                  Full throttle WEP OFF
      
      Using WEP gives no change to fuel burning in AH. So, distance becomes increase because using WEP is faster. I doubt it is not right really.
      
                 Reducing throttle to intake manifold pressure 30
          Reducing throttle to intake manifold pressure 20
      
      Less intake manifold pressure makes less fuel burning. That's right.
      
                  Full throttle and reduce engine speed minimum
      
      Less engine speed gives no change to fuel burning. So, distance becomes decrease because reducing engine power makes slower speed. That's wrong clearly.
      
      I wish HTC fix fuel burning model for realistic flight.
      
      Regards.
      
      

[senna]

In real life, pilots used to try to open up manifold pressure/boost as much as possible while leaning out the mixture as much as possible to maintaining the necessary airspeed for their cruise along the way to the target or combat zone.  Geeze what a run on sentence  

-- senna

 

Originally posted by Batmann:
AH fuel burning model include a important problem for long range flight. It may be needed a little knowledge to understand it. I explain it.

How should we fly for long range?[list=1]

• Slow speed[/b]
  Best speed is to make drag be minimum. It is faster only a little than in the stall speed. Big drag makes losing fuel more. Minimum drag speed need minimum engine power. Minimum engine power need minimum fuel burning.
  
  • Low engine speed[/b]
    There are 2 ways to reduce engine power.
    [/list=a]
    [list=a]
    • Reduce throttle[/b]
      Reducing throlle makes to reduce intake manifold pressure. It makes to reduce engine power and fuel burning.
      
      • Reduce engine speed by increasing propeller pitch[/b]
        Even if you don't move throttle, you can reduce engine power. Increase propeller pitch. Increasing propeller pitch makes to reduce engine power and fuel burning.
        [/list=a]
        Which is vest way to get optimum engine power?[list=1]
      • Minimum throttle and high engine speed
      • Minimum engine speed and high throttle
      [/list=a]
      
      Best way is Minimum engin speed and high throttle!
      
      It burn lesser fuel. Why? Imagine running by car. Which best way to run 25mph by 1st gear or top gear? Reducing engine speed is most important to less fuel burning.
      
      The explanation of basic knowledge is here. Let's go next step. What is a important problem about AH fuel burning?
      
      Reducing engine speed makes reduce engine power, but not reduce fuel burning in AH.
      So, If you increase propeller pitch for long range flight, only the shorter distance has become able to fly. It becomes a completely opposite result.
      
      I researched what becoming flight range by changing throttle or propeller pitch in AH.
      Using Fw190A-5, load 25% fuel, fuel burning rate 10.0 and taking off from MED terrain A18 field and go straight to South by sea level. These figures show the spot which the engine stopped at.
      
                  Full throttle WEP ON
                  Full throttle WEP OFF
      
      Using WEP gives no change to fuel burning in AH. So, distance becomes increase because using WEP is faster. I doubt it is not right really.
      
                 Reducing throttle to intake manifold pressure 30
          Reducing throttle to intake manifold pressure 20
      
      Less intake manifold pressure makes less fuel burning. That's right.
      
                  Full throttle and reduce engine speed minimum
      
      Less engine speed gives no change to fuel burning. So, distance becomes decrease because reducing engine power makes slower speed. That's wrong clearly.
      
      I wish HTC fix fuel burning model for realistic flight.
      
      Regards.
      
      

[senna]

In real life, pilots used to try to open up manifold pressure/boost as much as possible while leaning out the mixture as much as possible to maintaining the necessary airspeed for their cruise along the way to the target or combat zone.  Geeze what a run on sentence  

-- senna

 

Originally posted by Batmann:
AH fuel burning model include a important problem for long range flight. It may be needed a little knowledge to understand it. I explain it.

How should we fly for long range?[list=1]

• Slow speed[/b]
  Best speed is to make drag be minimum. It is faster only a little than in the stall speed. Big drag makes losing fuel more. Minimum drag speed need minimum engine power. Minimum engine power need minimum fuel burning.
  
  • Low engine speed[/b]
    There are 2 ways to reduce engine power.
    [/list=a]
    [list=a]
    • Reduce throttle[/b]
      Reducing throlle makes to reduce intake manifold pressure. It makes to reduce engine power and fuel burning.
      
      • Reduce engine speed by increasing propeller pitch[/b]
        Even if you don't move throttle, you can reduce engine power. Increase propeller pitch. Increasing propeller pitch makes to reduce engine power and fuel burning.
        [/list=a]
        Which is vest way to get optimum engine power?[list=1]
      • Minimum throttle and high engine speed
      • Minimum engine speed and high throttle
      [/list=a]
      
      Best way is Minimum engin speed and high throttle!
      
      It burn lesser fuel. Why? Imagine running by car. Which best way to run 25mph by 1st gear or top gear? Reducing engine speed is most important to less fuel burning.
      
      The explanation of basic knowledge is here. Let's go next step. What is a important problem about AH fuel burning?
      
      Reducing engine speed makes reduce engine power, but not reduce fuel burning in AH.
      So, If you increase propeller pitch for long range flight, only the shorter distance has become able to fly. It becomes a completely opposite result.
      
      I researched what becoming flight range by changing throttle or propeller pitch in AH.
      Using Fw190A-5, load 25% fuel, fuel burning rate 10.0 and taking off from MED terrain A18 field and go straight to South by sea level. These figures show the spot which the engine stopped at.
      
                  Full throttle WEP ON
                  Full throttle WEP OFF
      
      Using WEP gives no change to fuel burning in AH. So, distance becomes increase because using WEP is faster. I doubt it is not right really.
      
                 Reducing throttle to intake manifold pressure 30
          Reducing throttle to intake manifold pressure 20
      
      Less intake manifold pressure makes less fuel burning. That's right.
      
                  Full throttle and reduce engine speed minimum
      
      Less engine speed gives no change to fuel burning. So, distance becomes decrease because reducing engine power makes slower speed. That's wrong clearly.
      
      I wish HTC fix fuel burning model for realistic flight.
      
      Regards.