Speed indicator in HUD

[Mirtma]

Sometimes speed indicator on HUD just disappears. Is it only me?

[connos]

No it happens and i think its normal. I take some time and then it reappear.

[DTWD]

It's because you have lost power (reducing the throttle from auto does it usually) and the INU has lost it's settings. It takes a few minutes to re-align, then your speed works. Or if you go over 50kph forces the old traditional air speed indicator to kick in (air flowing over the sensor). This is also the case if you take off too quickly after power up.

[Mirtma]

TNX for info!

[JG14_Smil]

ground speed is always displayed on the Shkval, even with weapons hot.

[GGTharos]

Air speed.

 

ground speed is always displayed on the Shkval, even with weapons hot.

[therion_prime]

It's because you have lost power (reducing the throttle from auto does it usually) and the INU has lost it's settings. It takes a few minutes to re-align, then your speed works. Or if you go over 50kph forces the old traditional air speed indicator to kick in (air flowing over the sensor). This is also the case if you take off too quickly after power up.

 

Hmm... that doesn't quite make sense for me because

 

1) This also happens when you are flying above 50km/h

2) The speed-bar thingie left in HUD is always working, so why not display this value on the top left too?

3) The Skhval also displays speed

4) The analog gauge also displays speed

5) I fail to see what INU has to do with speed mesurement? (Maybe someon can enlighten me)

[DTWD]

I am only telling you what I was told:

 

http://forums.eagle.ru/showthread.php?t=36069

[Nate--IRL--]

Hmm... that doesn't quite make sense for me because

 

1) This also happens when you are flying above 50km/h

2) The speed-bar thingie left in HUD is always working, so why not display this value on the top left too?

3) The Skhval also displays speed

4) The analog gauge also displays speed

5) I fail to see what INU has to do with speed mesurement? (Maybe someon can enlighten me)

 

One is Air speed (gauge and skhval) the other is Ground speed (Hud)

 

Nate

[sobek]

5) I fail to see what INU has to do with speed mesurement? (Maybe someon can enlighten me)

 

There's a doppler sensor for speed measurement connected to the INU. The doppler speed measurement is what's shown on the hud, if i'm not mistaken.

[AlphaOneSix]

I am only telling you what I was told:

 

http://forums.eagle.ru/showthread.php?t=36069

 

Hey don't blame me! :P

 

Anyway, the two situations (yours and the OP's) are different, as are the answers. I don't know the answer to this one. ;)

[therion_prime]

I just tested it and it seems it has to do with something that needs generator power. When making hard manuevers (i.e. hard turns) the engine RPM go in the cellar and the generators fail to deliver power for a short amount of time. Skhval goes dark and "Watch Ekran" message is played - and the speed indication on the hud goes AWOL.

So INU is ruled out, as it can run on battery. Correct?

[DEWorley]

if it loses the speed in sharp turns, it may be because the doppler radar in the tail (?)isn't pointed at the ground at that point.

[GGTharos]

But the DNS might not be able to run on battery. ;)

[Sharkster64]

Can someone explain to me why the speed disappears from the hud when you activate a weapon. After all, this information is quite important, same as altitude. I know it is displayed in the shkval but not all weapons require that you look at the shkval. I find that very annoying because i cant turn my shkval or weapon on until i have come to a complete stop and have activated the auto hover. I would like to track a target at the same time as when I come to a hover.

[GGTharos]

You're trying to do two things at once and you shouldn't be. You're trying to simultaneously come to a hover (ie. by observing the environment close around you, NOT THE SPEED INDICATOR ON THE HUD) and shoot the target (you're looking at the target). I can see how you'd get overtasked.

 

Don't do it. ;)

 

The speed is removed because it is though to not very useful during weapon employment. The HUD is decluttered to give you a better view of the fight.

 

If you're using the HUD to get into hover, you're doing it wrong. You come to a hove by watching the ground.

[Sharkster64]

What about rockets or guns when you are no longer hovering. you dont find the speed indicator useful in the hud? speed is very important information, and i dont know of any other aircraft that doesnt supply that information in the hud when weapons are turned on.

[EtherealN]

No, I don't actually think speed is all that relevant at that time as long as you don't do the kind of maneuvers that would cause risk of overspeed. (Which you sholdn't, obviously.) The one really relevant thing when employing weapons on a moving engagement is range, IMO.

 

Most other aircraft either have two crew in the case of helicopters, or are flying with a bit more air between themselves and the ground (and with a more stable aircraft at that), wherefore avoiding exposure of the pilot to overtasking and information saturation is a lot more important in the Ka50 than in pretty much all other combat aircraft.

 

Also, your IAS indicator never stops working, takes all of one second to look at - and I don't even have my TrackIR yet. ;)

[GGTharos]

What about rockets or guns when you are no longer hovering. you dont find the speed indicator useful in the hud? speed is very important information, and i dont know of any other aircraft that doesnt supply that information in the hud when weapons are turned on.

 

Not one bit. I'm staring right at target + pipper.

[Sharkster64]

So you admit to looking at your airspeed in the IAS indicator. That is exactly my point. Any information that you have to look at should be on the hud. You shouldnt have to look at your instruments, especially in combat. If you dont feel the information is important then you should just have to hit the declutter button. Looking at airspeed is not overtasking. It is a quick determination of how fast you are going if you feel that information is important at that time. I dont know about you but i have never been overtasked by looking at my airspeed. I have never crashed or been shot down by simply looking at my speed. If airspeed isnt important, than why have it on the hud at all? Obviously there are certain people that do find airspeed important information, otherwise this wouldnt have been brought up. If you were to enter into a vortex ring state while gunning a target, you would obviously need to look at your airspeed to get out of it.

[EtherealN]

Yes, I do sometimes look at the IAS indicator. Not in the middle of a weapon deployment though - when deploying weapons I look at the Shkval and/or targeting pipper on the HUD. What I am saying is that in the context of how I use my instrumentation - for example getting into combat mode "early" - the IAS is quite good enough for me. It doesn't take more time to move my eyes down and to the left towards the IAS indicator than it would take to move them up and to the left towards a speed indicator on the top left of the HUD.

 

The important thing here is that you seem to think airspeed is a vital information during weapon deployment. It really isn't. The only case where I have a direct use for having the HUD speed indicator is when trimming for a set attitude and speed during navigation.

 

So you admit to looking at your airspeed in the IAS indicator. That is exactly my point. Any information that you have to look at should be on the hud.

[Maverick-GER-]

The important thing here is that you seem to think airspeed is a vital information during weapon deployment. It really isn't. The only case where I have a direct use for having the HUD speed indicator is when trimming for a set attitude and speed during navigation.

 

Amen!!!

'What do you need to know the speed for? even for rocket or gun attacks you dont need that information.... In case of rocket attacks you fly in (and you usually dont go too fast there anyhow) fire your rockets, turn away and fly back to cover. And if you plan on hitting with your rockets you would only stare at the target and that freakin pipper anyhow to know when you can finally release your babies!

[GGTharos]

I've never really looked at airspeed while in VRS (further, this is not what is displayed on the HUD!); I push the nose over and after a few seconds I'll have accelerated past 50kph, or the shaking stops, whichever comes first; then I begin my pull-out.

 

The radio altimeter will warn me of impending, unavoidable doom should I be too close to the ground if this happens ...

 

I've also never entered VRS while on a gun-run or a rocket run. Nor have I needed to look at the speed - what I really needed to do is fly level (is mu horizon getting higher or lower compared to say my HUD frame?) or whatever other attitude, always in reference to what's outside, while keeping the pipper on-target. If I don't want to keep the pipper on-target, at least for the gun, I'll slave it to the shkval ;)

 

At that point, I'll be looking outsie the pit to spot incoming; if I need to check speed, I'll be checking air and not ground-speed.

 

And again, if I'm going into a hover, visual references are just perfect.

 

Note though, that I am not saying the information isn't useful; it isn't there because the designers, together with feedback from pilots, decided it shouldn't be. Sometimes they get things wrong, but I don't think they have a propensity for doing so.

[ericinexile]

I find that HUD information is always pretty minimal and kept to essentials on RU airplanes (as simulated by ED...my only source ;-) I like it that way. The hud displays INS (or is it dopplar) groundspeed. The skhval and A/S indicator display IAS. Next to the HUD where it should be is the VVI. All the info the pilot needs is in his field of view and only targeting info is in the HUD--Nice and clean.

[Sharkster64]

I am not saying that i do use the airspeed indicator all the time. Chances are not a lot of people do. My eyes are on the pipper like everyone else. However there are times when flying an aircraft that certain tidbits of information do become useful. In such cases like an emergency. Over tasking in an emergency such as a vortex ring state for example, would be having to switch to the nav mode to have all relevant information displayed on the hud. In an emergency the best place for your eyes would be outside the cockpit, not in it. In order to get out of a vortex ring state you have to increase forward speed. Now to decrease overtasking in that situation and have eyes outside the cockpit, wouldn't it be better to have the speed indicator on the hud already? Imagine that you are in an actual chopper where you could actually get killed by entering into a vortex ring state. Where would you be looking, at your instruments or would you be looking outside the aircraft. Chances are you would want to be looking outside. Wouldn't you want that information to be on your hud? Also imagine that you are not looking at a small screen where it is easier to look at the airspeed indicator by moving your eyes down. Instead you are in a full size cockpit where you actually have to move your head down to look at you airspeed indicator. I know I for one would like to have a little information such as airspeed that other people think is useless on my Hud. Dont forget you could just press the declutter button, and take the altitude indicator off the hud as well, since all you want is the pipper.