Author Topic: Conservation of energy and pursuit tactics  (Read 1791 times)

Offline Suave1

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Conservation of energy and pursuit tactics
« Reply #60 on: February 17, 2001, 05:48:00 PM »
 
Quote
Originally posted by Dwarf:


What do either it or the Hi Yo-Yo have to do with a situation where the bogey is not maneuvering and you have no overtake speed?
(Which IS the situation posed at the beginning of this thread)

Dwarf


Offline Badboy

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Conservation of energy and pursuit tactics
« Reply #61 on: February 18, 2001, 03:42:00 AM »
   
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Originally posted by Dwarf:

Badboy was right and I was wrong.

Congratulations, Badboy. Well done.

Dwarf



[This message has been edited by Badboy (edited 02-18-2001).]
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Offline Jekyll

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Conservation of energy and pursuit tactics
« Reply #62 on: February 18, 2001, 08:00:00 AM »
 

[This message has been edited by Jekyll (edited 02-18-2001).]

Offline Jekyll

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Conservation of energy and pursuit tactics
« Reply #63 on: February 18, 2001, 08:21:00 AM »
 

Offline Suave1

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Conservation of energy and pursuit tactics
« Reply #64 on: February 18, 2001, 08:43:00 AM »
That's quoting Dwarf out of context, in his thread he's just saying that it works in AH. What he did would also work in real life, if the plane was not at max speed for the alt that it was at prior to the dive. If it was at max speed and dove, and climbed slowly back to that alt, shouldn't the speed that it had accumulated ebb as the plane would decelerate back to it's max speed for that alt ? What I disagree with is that a plane can catch up from kilometers behind to another plane of the same type that is going max speed co-alt, by using this method .

Offline Badboy

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Conservation of energy and pursuit tactics
« Reply #65 on: February 18, 2001, 02:24:00 PM »
 
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Originally posted by Suave1:
That's quoting Dwarf out of context, in his thread he's just saying that it works in AH.

That's not out of context, it is the main point of the discussion! I will concede that it was probably not worth quoting... After all, the only thing remarkable about Dwarf's posts was that he was able to contradict himself faster than I could respond.

 
Quote
What I disagree with is that a plane can catch up from kilometers behind to another plane of the same type that is going max speed co-alt, by using this method .

That point has been made several times in several threads, and I agree with it. I've never said otherwise, accept to clarify the fact that there is only one speed and one altitude in which it is strictly true. That is when the two aircraft are at their top speed close to their critical altitude. A very unlikely situation for an engagement to begin, don't you think?

If the aircraft are above that altitude then an initial dive to critical altitude is best. Below that altitude it is better to climb at the best energy transfer speed to an altitude where you can continue the chase with a higher true airspeed than your opponent. Which brings us to the point that if you begin to do that from a speed below best energy transfer speed, you can get to it as quickly as possible at zero g.  Which of course is exactly where we started!

Lastly please consider this... I'm amazed at the number of people willing to claim that a thing is wrong, simply because they don't understand it! I just wonder how many more will jump on the bandwagon?

Badboy
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Offline niklas

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Conservation of energy and pursuit tactics
« Reply #66 on: February 18, 2001, 03:41:00 PM »
Badboy, you always say dive to maximum energy transfer speed.

Do you know the typcial max.e.tspeed for a WW2 prop fighter? Often somewhere between 130-180mph IAS! You really don´t need to DIVE to this speed. If you come out of a sustained turn you´re very close to this speed, maybe your speed is even higher!

Offline Badboy

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Conservation of energy and pursuit tactics
« Reply #67 on: February 18, 2001, 05:05:00 PM »
 
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Originally posted by niklas:
Badboy, you always say dive to maximum energy transfer speed.

Obviously you should only dive to that speed if you are below it. If you are already at or above that speed, of course you don't need to dive. I'm sure many folk would have missed that point, thank you for clarifying it.

 
Quote

Do you know the typcial max.e.tspeed for a WW2 prop fighter?

When I have the time I will produce the "Energy Transfer" diagrams for the AH aircraft and post them along with the "Energy Maneuverability" diagrams. When I have that information, I will also revisit my article and bring it up to date. Of course I will take the opportunity to clarify many of the misunderstandings expressed in these threads at that time.

Meanwhile, if you already have that information, perhaps you will post it? If not, I see no point in pursuing this discussion until such time as the actual AH data is available.


Badboy
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Offline Sky Viper

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Conservation of energy and pursuit tactics
« Reply #68 on: March 07, 2001, 11:31:00 AM »
 
Quote
Originally posted by Badboy:
When I have the time I will produce the "Energy Transfer" diagrams for the AH aircraft and post them along with the "Energy Maneuverability" diagrams. When I have that information, I will also revisit my article and bring it up to date. Of course I will take the opportunity to clarify many of the misunderstandings expressed in these threads at that time.

Meanwhile, if you already have that information, perhaps you will post it? If not, I see no point in pursuing this discussion until such time as the actual AH data is available.


Badboy


Badboy,
I just came accross this thread by way of your article, so forgive me for beating the poor old nag.

I didn't read everyone's input here, but I caught most of it, and read all of yours (I think).

The one thing you keep coming back to is that you will chart the AC in Aces High.
When are you going to contact Piper, Beech, Northrop, NASA etc. and get some data on real planes.
This is after all, a simulator of WW2 aircraft, no?

The entire discussion and the accusations that you must have cheated are based on the real feeling that we all get from the science we were taught in school and our experiences in life.
The point to be made here is that Flight Modeling may or may not be correct.  If we want Simulated realism, then we have to proof things against real occurrances.

Your P/E diagram is nice, and I understand the thought, but I think there is something missing.

When the plane dives, power and energy are both increased. Easy enough.
Now that the power is at a higher state, the plane can cover more distance in a shorter time. Also easy.
Understanding also that by diving, the distance covered is already greater than that of the plane being persued.
Now what happens and I think what you lose in your theory, is that during the climb, you are adding even more distance, Gravitational effect, and burning off that power that you just gained.
I understand the concept in Jet aircraft because the turbine engine creates more power due to the "Free" compression of gasses that is made by the extra speed. This is one of the basic functions of a turbine engine. The limit of power on any turbine is it's own ability to withstand the mechanical stress.

Piston driven engines however suffer the opposite effect at some point.  As you increase RPMs, you will come to a point where the power curve will drop dramatically!
Superchargers and turbochagers can only compress gas and air to a certain point where as mother nature becomes the compressor in the jet.

Hence, at the transition from the dive to the climb, in a piston driven plane, the power consumption would/could be at or beyond it's highest level, and would neggate some of your explination.

I guess the manuver would therefore be highly dependant on the speed at which it is begun.

I would enjoy hearing your thoughts on this, and if you can get some real AC data, I think we would all rest much easier.



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