Easier way to calculate TAS? (IL2)

Schwieger · 12-30-10, 01:54 AM

never mind

Fish40 · 01-17-11, 02:04 PM

I sure would like to know

Schroeder · 01-17-11, 03:19 PM

If you have one of the semi automatic bomb sights like in the He 111, Ju 88, B25 etc you don't need to know your true airspeed. You can determine it by trial and error as the bomb sight will show you if your data is wrong.
Just punch in your altitude, take your indicated speed and add some notches depending on your altitude (I usually start with 30 - 50 km/h faster than my IAS at more than 3000m altitude). Now look ahead through the bomb sight and target something (preferably at an angle less than 65° as it seem the bomb sight will work inaccurately beyond that for some reason). Once the bomb sight has been switched to "auto" the cross-hair should remain on your target. If your target moves faster down than your cross-hair your entered speed was too low. Add more speed and re-aim (be careful not to get to the automated bombs release, go for a new dummy target if necessary).
If your cross hair moves faster downwards than your target your speed setting was too high. Lower it and re aim. Do this until your cross hair stays on the target. Minor changes can even be done while the auto mode is active.
Practise that a little any you will rarely miss your targets, even from high altitudes without any sort of calculation.

If you have a "dumb" bomb sight like in the TB3...well...no idea. I think there have been charts on the internet that showed your TAS in relation to IAS and altitude...though I think I still missed with them by quiet some margin....

Raptor1 · 01-17-11, 03:32 PM

Quote:

Originally Posted by Schroeder

If you have one of the semi automatic bomb sights like in the He 111, Ju 88, B25 etc you don't need to know your true airspeed. You can determine it by trial and error as the bomb sight will show you if your data is wrong.
Just punch in your altitude, take your indicated speed and add some notches depending on your altitude (I usually start with 30 - 50 km/h faster than my IAS at more than 3000m altitude). Now look ahead through the bomb sight and target something (preferably at an angle less than 65° as it seem the bomb sight will work inaccurately beyond that for some reason). Once the bomb sight has been switched to "auto" the cross-hair should remain on your target. If your target moves faster down than your cross-hair your entered speed was too low. Add more speed and re-aim (be careful not to get to the automated bombs release, go for a new dummy target if necessary).
If your cross hair moves faster downwards than your target your speed setting was too high. Lower it and re aim. Do this until your cross hair stays on the target. Minor changes can even be done while the auto mode is active.
Practise that a little any you will rarely miss your targets, even from high altitudes without any sort of calculation.

If you have a "dumb" bomb sight like in the TB3...well...no idea. I think there have been charts on the internet that showed your TAS in relation to IAS and altitude...though I think I still missed with them by quiet some margin....

If you're in a TB-3, you're probably flying so low that you can usually guess when to drop the bombs without having to deal with the bombsight too much (Except maybe for sighting below the aircraft).

Fish40 · 01-20-11, 01:14 PM

I came across a formula for TAS. It is as follows: TAS= ALT divided by 1000 X 5 + IAS. Haven't tried it yet. For the auto bombsites, yes the locking on a dummy target is an easy way to adjust for it. The site in a Pe2 however is not auto. There is no locking on a dummy target to adjust speed. At least not that I know of

saipan · 05-05-11, 05:42 PM

try using bombtable2. also the most american bombers have TAS dipalyed to the the left of the bombadiers seat.

12-30-10, 01:54 AM	#1
Schwieger Commodore Join Date: Jul 2010 Location: U-142 Posts: 624 Downloads: 62 Uploads: 0	Problem solved never mind __________________ Support U-Boot_HAHD: Install Dropbox Click Here & Increase The Teams Dropbox space and get 2.25GB of free online Storage space for yourself. Last edited by Schwieger; 12-30-10 at 02:19 AM.

01-17-11, 03:19 PM	#3
Schroeder Navy Seal Join Date: Apr 2008 Location: Banana Republic of Germany Posts: 6,170 Downloads: 62 Uploads: 0	If you have one of the semi automatic bomb sights like in the He 111, Ju 88, B25 etc you don't need to know your true airspeed. You can determine it by trial and error as the bomb sight will show you if your data is wrong. Just punch in your altitude, take your indicated speed and add some notches depending on your altitude (I usually start with 30 - 50 km/h faster than my IAS at more than 3000m altitude). Now look ahead through the bomb sight and target something (preferably at an angle less than 65° as it seem the bomb sight will work inaccurately beyond that for some reason). Once the bomb sight has been switched to "auto" the cross-hair should remain on your target. If your target moves faster down than your cross-hair your entered speed was too low. Add more speed and re-aim (be careful not to get to the automated bombs release, go for a new dummy target if necessary). If your cross hair moves faster downwards than your target your speed setting was too high. Lower it and re aim. Do this until your cross hair stays on the target. Minor changes can even be done while the auto mode is active. Practise that a little any you will rarely miss your targets, even from high altitudes without any sort of calculation. If you have a "dumb" bomb sight like in the TB3...well...no idea. I think there have been charts on the internet that showed your TAS in relation to IAS and altitude...though I think I still missed with them by quiet some margin.... __________________ Putting Germ back into Germany.

01-17-11, 02:04 PM	#2
Fish40 The Old Man Join Date: Aug 2006 Location: Yonkers, NY U.S.A. Posts: 1,507 Downloads: 154 Uploads: 0	I sure would like to know

01-20-11, 01:14 PM	#5
Fish40 The Old Man Join Date: Aug 2006 Location: Yonkers, NY U.S.A. Posts: 1,507 Downloads: 154 Uploads: 0	I came across a formula for TAS. It is as follows: TAS= ALT divided by 1000 X 5 + IAS. Haven't tried it yet. For the auto bombsites, yes the locking on a dummy target is an easy way to adjust for it. The site in a Pe2 however is not auto. There is no locking on a dummy target to adjust speed. At least not that I know of

05-05-11, 05:42 PM	#6
saipan Gunner Join Date: Mar 2010 Location: so california Posts: 98 Downloads: 118 Uploads: 0	try using bombtable2. also the most american bombers have TAS dipalyed to the the left of the bombadiers seat.