Accelaration.

[HR_Tumu]

Afortunally we have some charts about speeds, climb rates and turn ratios. And good tests about this data. THX.

 

I try to find something about accelation of airplanes. But seems nothing is analized about this caracteristic.

Anybody have any info about accelerations.

 

 

 

Thx in advance.

[357th_KW]

I’ve never seen any original test data on this topic, outside of general descriptions of test pilots flying alongside each other to compare two aircraft.  However, acceleration is gong to be determined by excess thrust, divided by mass.  This is exactly the same a climb performance - and so acceleration will be directly proportional to climb performance at the same speed and altitude.  Most WW2 fighters had a best climb speed in the neighborhood of 150-180mph indicated.
 

As speed increases, drag also increases, thus reducing excess thrust.  Excess thrust will reach 0 at the aircraft’s max level speed, and thus acceleration will also be 0.  So we can see that at a given altitude, acceleration at low speed will be directly proportional to rate of climb, and then taper off as the aircraft gets closer to its maximum level speed.  
 

An interesting example would be a Spitfire Mk IX and an FW 190A8.  If we compare them at sea level, the Spitfire would have much better acceleration at low speed (better climb rate), but as speed increases the FW 190 would gradually gain the upper hand(better top speed).

[JtD]

In addition to what KW_1979 wrote, it is also important to note the detailed circumstances. For instance, the Fw190 in practice was very good at acceleration, because changes in power setting were managed by the Kommandogerät. Other aircraft would need the pilot to increase mixture, rpm then throttle, to say the least, giving them a much slower response. This way the Fw190 does rather well in side by side comparisons, even though the climb rate isn't particularly great. This is just one example about how important it is to read the fine print.

[HR_Tumu]

Thx friends.

 

I assume are a logical relation betwen climb and acceleration for general idea. And of course engine power deploy .

 

Thx.

Then if i want know more i can do some test ... im not sure what can be best metodology. Any idea?

 

I think in 2 posible 

 

1.- From Speed X at altitude Y,  do a dive with angle Z and max power. Then check time and speed . Dive acceleration.

2.- From Speed X at altitude Y, max power , then check  time and speed.  Level acceleration.

 

[JG27*PapaFly]

On 1/8/2020 at 1:23 AM, 666GIAP_Tumu said:

I try to find something about accelation of airplanes. But seems nothing is analized about this caracteristic.

Anybody have any info about accelerations.

 

I did a few level acceleration tests prior to the addition of Bodenplatte planes.

Level acceleration under full realism, at 300m ASL, 50 percent fuel, on level autopilot.

As shown in the diagram below, the Fw-190 and P-39 lead the pack above 350 kph TAS, and the Spit IX is the top dog below that speed.

 

Because the diagram above does not show what the tactical meaning of the measured differences is, I've prepared following diagram. It shows how much time each plane needs to accelerate through given speed intervals. Here you see that the Spit IX needs an additional 5 seconds compared to the 190A5 to accelerate from 450 to 500 kph.

[Venturi]

Propeller efficiency at a given speed and altitude also counts.

 

HP is multiplied by the propeller efficiency to get thrust. And so this factor has a large impact on the aircraft. Additionally as stated above, excess power, obviously. However, airframe drag is important as speeds increase. This is because drag increases in exponential factor, thus an aircraft which has lower drag but also lower power than another, may still have faster acceleration than the plane with higher power but higher drag, at higher speeds. I.E., see mustang.

[LLv34_Flanker]

S! 

 

I posted ages ago the LagG-3 test flight report done by Finnish Air Force. It includes acceleration and deceleration data for the plane. Easy to compare against the game data. 

[HR_Tumu]

Papa

Thx a lot for yours diagrams

I only miss data for F2 or F4

Thx.

 

Flanker, how i can search your report, what words i can use search?

thx

[LLv34_Flanker]

S!