View Full Version : bombsight sideslip + altitude

04-30-2006, 06:28 PM
Anyone use it the sideslip setting in the bombsights? If so what for?
I would have thought it was for flying in a cross-wind, but since this isn't modelled, does it still have a use? For instance, with level-stabilizer on, if you use rudder trim to turn the nose onto target, does that now mean you're sideslipping? If I trim to the left with stabilizer on, should I adjust the sideslip in the sight? Which direction?


04-30-2006, 07:02 PM
im not sure myself. ive used it when ive lost a engine and crabbing but still missed. sometimes useful to help u find the target

04-30-2006, 08:11 PM
Nope. Ya shouldn't have to mess with the sideslip adjustment. I use rudder trim when level bombing all the time (ya kinda have ta) and have no problem hitting the target.

However, when flying the Betty I noticed I need to aim towards the left side of the target in order to hit. I wonder if the sideslip adjustment would help with that...hmmm...


05-01-2006, 05:27 AM
Ok. Thanks.
So there must be another reason why I always miss when level bombing! To extend the question, I'll ask this:

The sight altitude is always 'height to target'.
This is only equal to your gauge altitude if the target is at sea level. So if you are doing a bomb run on land, how do you account for the rise in landscape?
- Do you not bother accounting for it?
- Do you generally subtract a couple of hundred meters?
- Do you try to get the correct height information from some source (eg. printed map).


05-01-2006, 10:10 AM



05-01-2006, 10:13 AM
Four biggest mistakes when first using the bombsight:

1. Not converting to the correct height units. In German planes you input meters, in American feet.

2. Not inputting the correct speed. The speed must be input as True Air Speed. You cannot use your Indicated Air Speed. I THINK, to convert to true air speed take indicated speed and increase by 2% for every thousand feet of altitude. So, at 10,000 feet your speed over ground is actually 20% higher than your instruments show. For American planes you must also convert to Knots (reducing IAS by about 10% seems to be a close enough guess.)

3. Not checking the sight after you lock on target. If the sight is creeping forward from your target point you input too low a speed. If it's creeping back you put in too high a speed.

4. You must subtract target altitude from your indicated altitude. So, if the target is 2000 ft. above sea level and you're at 10,000 ft. indicated then you should put 8000 ft in the bombsight.

OOPS! Forgot one more thing. Make sure to engage the level stabilizer (NOT AUTOPILOT) and use rudder trim to steer into the target. You will need to have keys set up for these.

05-01-2006, 10:39 AM
I hate to tell you a long kept secret. You just use the speed bar: in feet for the US, in meters for the Germans. You enter the correct height (minus target height),hit the stabilizer and try to get the target into the crosshair alignment by using the rudder trim. Once you are aligned, you enter the speed indicated by the speedbar (mph for US, km/h for the Germans),hit the automatic bombing, and then..... use the speed adjustment as a target correction to keep the target inside the crosshair http://forums.ubi.com/images/smilies/10.gif
You just put in more or less speed to keep the target under the crosshair while you are on the approach (forget all these complicated calculations). And then watch it: WHAMMO, right into the pickel barrel http://forums.ubi.com/images/smilies/clap.gif

Well, now that you know about it, I can't show off with that anymore. It works perfectly !

05-01-2006, 10:48 AM
I don't fly with the speed bar on.

05-01-2006, 11:37 AM
Also, even if you had the speed bar on, I believe it shows IAS in full cockpit games.

05-02-2006, 11:13 AM
Good advice, but I know all that stuff. My question was specifically, how do you find out the height of the landscape that the target is on? Do you just guess, do you look it up somewhere, or do you not bother adjusting for landscape height?


05-02-2006, 11:30 AM
Recon flights! That's what the Intel boys are there for!

If I'm on-line, I'll hop in a fast little scooter and do a quick fly by to get the altitude.

Off-line I'll just load up the map in FMB and check it out in safety.

Hmmm...I wonder if anyone out there has done up any maps with altitudes? If not, I know what my next project is going to be...oooh, I'm getting excited already....

05-02-2006, 12:59 PM
I usually take the height of my airbase as a reference....western Russia is quite flat... http://forums.ubi.com/groupee_common/emoticons/icon_wink.gif

05-02-2006, 02:08 PM
irl id guess they would go from maps for the height...

gonna print off a ias/tas thing for pe2 when i find my office disk http://forums.ubi.com/images/smilies/16x16_smiley-happy.gif

05-02-2006, 02:13 PM
Originally posted by StellarRat:
Also, even if you had the speed bar on, I believe it shows IAS in full cockpit games.

Yes, but the whole IAS/TAS thing for bombsights is a bit buggy; try it - you often find the speedbar IAS gives you better results.

05-03-2006, 01:43 AM
I don't think there are any problems with TAS/IAS. I can hit a ramp at an airfield consistently from 7500m with the B-25. You might be getting better results because you're flying low enough that the IAS is close to TAS anyway. Remember that you also have to reduce the IAS/TAS results by about 10% to convert them to KNOTS. You input TAS in KNOTS into the bombsight.

05-03-2006, 05:26 AM
Hi guyz

Is there a TAS indicator aboard the PE-2?
The one I found corresponds to the speedbar-IAS.