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View Full Version : Supersonic bombers of WW2: DON'T TRY THIS AT HOME!



zhenelzuar
10-14-2006, 07:59 AM
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zhenelzuar
10-14-2006, 07:59 AM
My speed was 1080 km/h<div class="ev_tpc_signature">

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Bang_D
10-14-2006, 08:11 AM
Friend, 1 mach is about 340m/s that is something like 1220KM/H. 1080 is not enough. Also, you will hear a sonic boom as you break the sound barrier.

http://forums.ubi.com/groupee_common/emoticons/icon_cool.gifTry harder, I hope you could make it! LOL

NonWonderDog
10-14-2006, 08:39 AM
At 9990 m, 1080 km/h is very close to Mach 1.0 exactly. Based on my experiences, IL2 is set up so that planes explode at Mach 1.0 or thereabouts--they don't break up, they explode like a bomb. It seems the plane broke up at a lower altitude, though, so you didn't hit Mach 1.

The speed of sound varies with the bulk modulus and density of the air. (If we assume an ideal calorically perfect atmosphere, it's just a = 20.07*sqrt(T), with T in Kelvins.) If the speed of sound were constant, aerodynamic formulas would use velocity instead, and we wouldn't even care about Mach number.

You'd never hear a sonic boom from the cockpit, either. Partially because there are no sonic booms in IL2, but mostly because you'd never hear a sonic boom from the cockpit in real life. It's not a gunshot that goes off when you cross the "sound barrier," a sonic boom is just the bow shockwave in front of a supersonic aircraft.

Platypus_1.JaVA
10-14-2006, 09:27 AM
Originally posted by Bang_D:
Friend, 1 mach is about 340m/s that is something like 1220KM/H. 1080 is not enough. Also, you will hear a sonic boom as you break the sound barrier.

http://forums.ubi.com/groupee_common/emoticons/icon_cool.gifTry harder, I hope you could make it! LOL

Alot of other things go "boom" first, if you try to break the soundbarrier in a B-25... http://forums.ubi.com/images/smilies/16x16_smiley-very-happy.gif<div class="ev_tpc_signature">

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zhenelzuar
10-14-2006, 10:01 AM
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zhenelzuar
10-14-2006, 10:02 AM
PS
Go229 raising the speed and: Boom<div class="ev_tpc_signature">

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joeap
10-14-2006, 11:00 AM
Nice try and funnny screens. http://forums.ubi.com/groupee_common/emoticons/icon_biggrin.gif

VF2_Sarge
10-14-2006, 11:37 PM
690mph is max speed

690 MPH = 1110.4494906416466 KMPH


Then things go boom.<div class="ev_tpc_signature">

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FritzGryphon
10-15-2006, 12:29 PM
No, it's exactly 1167.3461km/h.

But seriously, the speed of sound varies greatly depending on altitude and other factors. There is no one speed of sound.

When one says that the F-15s top speed is Mach 2.5, they don't mean 3000 km/h!

http://bpesoft.com/s/wleizero/xhac/?M=s

VF2_Sarge
10-15-2006, 01:39 PM
Calculation based on: (rounded)
1 Mile/hour = 1.609344 Km/hour

690 mph is 1110 kph

690mph is 1110kmph is max speed in IL-2 before you explode.

But if you really want to get scientific about it.

The speed varies with the medium employed (for example, sound waves move faster through water than through air), as well as with the properties of the medium, especially temperature. The term is commonly used to refer specifically to the speed of sound in air. At sea level, at a temperature of 15 ?C (59 ?F) and under normal atmospheric conditions, the speed of sound is 340 m.s-1 (1225 km.h-1 or 761 mph).

The speed of sound is sometimes used in describing the nature of substances.

In conventional use and in scientific literature sound velocity, v, and sound speed, c, are used synonymously and should not be confused with sound particle velocity (also symbolized as v), which is the velocity of the individual particles.

The speed varies depending on atmospheric conditions; the most important factor is the temperature. Humidity has little effect on the speed of sound, nor does air pressure per se. (Pressure has no effect at all in an ideal gas approximation. This is because pressure and density both contribute to sound velocity equally, and in an ideal gas the two effects cancel out, leaving only the effect of temperature.) Sound usually travels more slowly with greater altitude, due to reduced temperature. An approximate speed of sound in 0% humidity (dry) air, in meters per second (ms-1), at temperatures near 0 ?C, can be calculated from:

http://img118.imageshack.us/img118/6425/c42159ec2d8578e23e2f76a1e52ea681hu4.png

where http://img118.imageshack.us/img118/7232/0c79b45fa36a2dd560ef3b4d18f238deip2.png (theta) is the temperature in degrees Celsius(?C), not Kelvins.

This equation is derived from the first two terms of the Taylor expansion of the equation:

http://img118.imageshack.us/img118/9277/64f59a86efc1b24427eee24e3adb19dbvh0.png (http://imageshack.us)

This equation is correct to a wider temperature range, but still depends on the approximation of heat capacity being independent of temperature, and will fail particularly at higher temperatures. It gives good predictions in relatively dry, cold, low pressure conditions, such as the Earth's stratosphere.

But...yes...I knew that Fritz. Thanks. http://forums.ubi.com/images/smilies/10.gif My orginal post was referring to the set speed (IN IL-2) at which a plane explodes. So, the possiblity of Mach 1 (in IL-2) is not possible.

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NonWonderDog
10-15-2006, 04:51 PM
Why'd you just copy the Wikipedia article on the speed of sound? http://forums.ubi.com/images/smilies/53.gif

VF2_Sarge
10-15-2006, 05:10 PM
Originally posted by NonWonderDog:
Why'd you just copy the Wikipedia article on the speed of sound? http://forums.ubi.com/images/smilies/53.gif

To make a point. I guess you got it. Thanks for your contribution.<div class="ev_tpc_signature">

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