Why still no dive acceleration difference?

[FC99]

Originally Posted by BlackBerry

1)FC99, 30 degree dive is very different from 60 degree dive,leave alone 90 vertival.

Not really, as JtD already pointed, time is big factor here. If you dive vertically you will reach max allowed speed very fast and you will have not enough time to build big separation. And remember, when we are talking about planes like P-51 or P-47 and A6M5 we are talking about polar opposites of WWII fighter world.

That's basically the biggest difference you can expect and it is still not some huge separation some are wishing for.

Let's go back to mayshine's calculation for a moment.

set g=10, m = 10 , back force = 50

plane mass = 2m
second plane mass = 1m

F=ma

a1: a2
= (2m*g-backforce)/2m : (m*g-backforce)/m
=150/20:50/10
=7.5:5

Now let's put some real numbers for mass. I'll use FW190A5 and La5 values for mass. For now we will assume that drag(backforce) is the same although drag is somewhat higher for FW, I'll use drag = 4000 for both planes in time =0.

Acceleration

FW
(4100*10-4000)/(4100)=9,02

La5

(3300*10-4000)/(3300)=8,79

How much difference you can expect if they started the vertical dive from 2000m to the ground with starting speed = 260 Kmh?

page 3-4


There is a "zoom"(should be nearly 90 degree upwards) test about P51D and Zeke with same cruising speed and altitude, side by side.


If il2-4.11m perfectly reproduce this "zoom" record, this thread's "boom" discuss can be closed.

Zoom is not necessarily 90 deg and in case of WWII fighters 90 deg zooms are mostly useless due to low power/weight ratio.

But again, difference is very small just 300 ft(~100m) from cruise flight up to 500ft after the zoom from dive. Considering that everything under 500m (~1600ft) is shooting distance for most Il2 players it is not enough to just put your plane into dive or zoom and expect that will solve all of your problems.