Unexplained acceleration (Explained)

[VBF-12_Stick-95]

I was doing testing in QMB when I noticed something odd which I termed the Boomerang Effect.  I was monitoring my speed at various altitudes with specific settings, etc.   Once my setting were fixed I increased the game speed to 8x.  Several times I hit the edge of the map and was looped back.  This loop back takes about a minute in real time.  What I noticed when this happened was that after coming out of the turn the plane would go 10+ mph faster.  I did this in a couple different allied aircraft at different altitudes with the same result.  To make sure fuel usage was not the issue I choose a spawn point closest to the map edge to test and still received the added speed.  I also took the same aircraft with a lower fuel load out to test without hitting the map edge to see if it could match the higher speed but it never did.  I have no idea if this would do the same thing in mp but I see no reason why it wouldn't.

 

Maybe someone could corroborate this testing to see if they get the same result.

 

Edited April 24, 2020 by VBF-12_Stick-95

[AndyJWest]

Is it staying at the same altitude through the turn?

[RedKestrel]

44 minutes ago, VBF-12_Stick-95 said:

I was doing testing in QMB when I noticed something odd which I termed the Boomerang Effect.  I was monitoring my speed at various altitudes with specific settings, etc.   Once my setting were fixed I increased the game speed to 8x.  Several times I hit the edge of the map and was looped back.  This loop back takes about a minute in real time.  What I noticed when this happened was that after coming out of the turn the plane would go 10+ mph faster.  I did this in a couple different allied aircraft at different altitudes with the same result.  To make sure fuel usage was not the issue I choose a spawn point closest to the map edge to test and still received the added speed.  I also took the same aircraft with a lower fuel load out to test without hitting the map edge to see if it could match the higher speed but it never did.  I have no idea if this would do the same thing in mp but I see no reason why it wouldn't.

 

Maybe someone could corroborate this testing to see if they get the same result.

Maybe there's a small moon out there and you're getting a gravity slingshot effect!

[VBF-12_Stick-95]

Yes, altitude is the same, the loop back only changes heading.  The plane slows during the loop back but once out of it, it accelerates to the 10+ mph over the previous speed without change to any settings.  This acceleration takes a couple of minutes.  Within one minute of coming out of the turn the speed exceeds the speed before going into the turn.  Everything I have done, including any heading turns were with level stab on.  I verified again that with only changing to a lighter fuel load out, with the same altitude and settings, the speed is the same as the pre-loop back speed of the previous test.  It cannot achieve this same speed level as after the loop back.

 

Edited April 24, 2020 by VBF-12_Stick-95

[Barnacles]

Can you give me the plane, loadouts, map, season and everything else and I'll try to reproduce?

Edited April 24, 2020 by 71st_AH_Barnacles

[VBF-12_Stick-95]

I can give my plane/load out, etc. info but we need to see if this happens with all planes.  It happened to me with a P-51 and a Spit IX.  I was on different maps, at different altitudes, with different engine settings with the same result.  I would suggest taking up your favorite mount. 

 

Two steps.  Once spawned in, leave the plane on level stab to avoid changes in altitude.  For all turns use the level stab turn right/left keys.

 

Sortie 1.  Control flight.  Take a spawn point near the map edge.  After spawning make sure you are NOT heading toward the map edge.  Leave you plane in level stab, get your engine controls set.  Increase game speed to 8X until you reach max speed with those setting and take note of it.  End mission

 

Sortie 2. Loop back speed check.  Take the same spawn point, same load out.  After spawning leave you plane in level stab, get your engine controls set to the same as Step 1.  Now turn toward the map edge using the level stab turning so as not to change altitude.  Increase game speed again and note speed just prior to going into the loop back turn.  Once back in your aircraft after the turn, check your speed.  Initially it will be lower than when you went in with but within a minute it  should be faster and over the next minute or so it will exceed Step 1 speed by 10+ mph (16+ kph).

 

Optional Sortie 3.  Lower fuel load out check.  You can double check that fuel usage was not the cause of the speed increase by repeating  Step 1 with lower fuel levels.

 

 

 

Edited April 24, 2020 by VBF-12_Stick-95

[coconut]

Couldn't it be that the AI set up some setting (engine, rads, trim) to an optimal value when it took control during the off-map U-turn?

Maybe try to turn around again, send the plane off-map again, and see if you get another 10kph boost after that.

[Barnacles]

48 minutes ago, VBF-12_Stick-95 said:

I can give my plane/load out, etc. info but we need to see if this happens with all planes.  It happened to me with a P-51 and a Spit IX.  I was on different maps, at different altitudes, with different engine settings with the same result.  I would suggest taking up your favorite mount. 

 

Two steps.  Once spawned in, leave the plane on level stab to avoid changes in altitude.  For all turns use the level stab turn right/left keys.

 

Sortie 1.  Control flight.  Take a spawn point near the map edge.  After spawning make sure you are NOT heading toward the map edge.  Leave you plane in level stab, get your engine controls set.  Increase game speed to 8X until you reach max speed with those setting and take note of it.  End mission

 

Sortie 2. Loop back speed check.  Take the same spawn point, same load out.  After spawning leave you plane in level stab, get your engine controls set to the same as Step 1.  Now turn toward the map edge using the level stab turning so as not to change altitude.  Increase game speed again and note speed just prior to going into the loop back turn.  Once back in your aircraft after the turn, check your speed.  Initially it will be lower than when you went in with but within a minute it  should be faster and over the next minute or so it will exceed Step 1 speed by 10+ mph (16+ kph).

 

Optional Sortie 3.  Lower fuel load out check.  You can double check that fuel usage was not the cause of the speed increase by repeating  Step 1 with lower fuel levels.

 

 

 

The p51's auto radiator is most efficient at 40% open on the water and 0% on the oil. If the rads were in auto control it may have been a change in heat levels during the turn caused the rads to change to a faster position? 

I'll try myself anyway.

 

Update, tried a couple of planes, on the mustang with auto rads I did see a slight increase in speed, but with manual rads, no difference. Same for the 47 and g14 with manual rads.

The spitfire's rads only open with extended use of 25lb boost. Was that what you were testing? @VBF-12_Stick-95

[VBF-12_Stick-95]

Found it.  In all my testing when the plane entered the loop back I never changed any settings, however the game did.  In my most recent test at 4000m with 550l fuel I set the P-51 manifold pressure to 65% which is about 42 in (prop at 83%, mix at 70%).  When I came out of the loop back, although I hadn't touched the throttle, the mp went up to 50 in.  That's what causes the increase in speed.  If I go into the loop back at 100% throttle, there is no added speed when it comes out.

 

 

Thanks for your input and checking this guys.

 

Edited April 24, 2020 by VBF-12_Stick-95