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Aileron booster


bkthunder

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Can someone explain why the ailerons don't move at all with ail. booster off?

My understanding is that the booster is, well, a booster and control should still be possible (albeit difficult) without it.

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U need to enable it, its a toggle switch just behind the flare dispenser, on the backside of the throttle.

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U need to enable it, its a toggle switch just behind the flare dispenser, on the backside of the throttle.

 

That's not what he asked.

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RALT+H enables aileron boosters. I think its a hydraulic thing but I am mostly wrong..

 

My guess it could be insufficient aileron authority at high speeds.

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Can someone explain why the ailerons don't move at all with ail. booster off?

My understanding is that the booster is, well, a booster and control should still be possible (albeit difficult) without it.

 

Ailerons not moving at all with boosters off is a bug for sure.

 

According to technical documentation for Samolet 75b that I have (Section 4 - Controling the aircraft) the deflection with boosters on should be 20°+-1° and with boosters off 20°-2°.

 

The max. force on the stick with boosters off at speeds M=0,88-0,9 (950-1000km/h) should be no more than 10kg.

1710519885_Techmanual.thumb.jpg.63e62d376b526ea40169985d87ca32e3.jpg

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RALT+H enables aileron boosters. I think its a hydraulic thing but I am mostly wrong..

 

My guess it could be insufficient aileron authority at high speeds.

AWAITING ED NEW DAMAGE MODEL IMPLEMENTATION FOR WW2 BIRDS

 

Fat T is above, thin T is below. Long T is faster, Short T is slower. Open triangle is AWACS, closed triangle is your own sensors. Double dash is friendly, Single dash is enemy. Circle is friendly. Strobe is jammer. Strobe to dash is under 35 km. HDD is 7 times range key. Radar to 160 km, IRST to 10 km. Stay low, but never slow.

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This caught me by surprise yesterday. Took off an realised I couldn't bank. Luckily the rudder has plenty of side-effect roll so I managed to go into level flight to look for the switch.

 

Looks like a bug to me.

 

Not a bug, a disclosed change, was stated in last patch note

"change in aileron booster switch logic"

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The MiG-21 emergency checklist says, that in case the boosters fail, you turn off the switch and continue flying. The instruction allows to fly straight in this condition with speeds lower than 1000 km/h or 1.4Ma, and make turns with speed less than 600 km/h. It warns that the forces on the control stick will be considerably higher.

 

Seriously, guys, a little imagination. What would be a purpose of a switch that completely kills aileron control :doh:

 

46.jpg

47.jpg

 

http://www.muzeumlotnictwa.pl/index.php/digitalizacja/katalog/2313


Edited by some1

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yeah, just the word "booster" implies they "boost" the ailerons, not directly control them.

 

and actually aircraft designers have and still do design aircraft with no redundancies, a japanese 747 failed and crashed into a mountain because of such an issue, loss of hydrolic pressure in the tail due to losing the vertical stabilizer, all the hydrolic lines cut.... around 500 people died...

 

a redundancy would be electrically controlled or actual mechanical linkages, not just hydrolics, even though there are redundant hydrolic systems so if any three fails there's a fourth.


Edited by Hadwell

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Japan Airlines Flight 123?

That was due to incompetent maintenance and paperwork not by design failure.

 

yeah and if your aileron boosters fail in the mig-21, it'll be because of improper maintenance, or bullet holes...

 

the mig-21 has physical mechanical linkages to the ailerons, I can't see any reason why having the boosters off would stop you from controlling the ailerons...


Edited by Hadwell

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and actually aircraft designers have and still do design aircraft with no redundancies, a japanese 747 failed and crashed into a mountain because of such an issue, loss of hydrolic pressure in the tail due to losing the vertical stabilizer, all the hydrolic lines cut.... around 500 people died...

 

a redundancy would be electrically controlled or actual mechanical linkages, not just hydrolics, even though there are redundant hydrolic systems so if any three fails there's a fourth.

 

That's a fallacy. No redundancy would save you in case of catastrophic failure like this, there is a high chance that cables to power and control your electric engines would be severed as easily as hydraulic lines. And mechanical controls would jam, like on a similar DC-10 disasters. Besides, electric engines that were light and powerful enough for this application were not really available in the '70s.

 

Anyway, the hydraulic boosters on the MiG-21 and similar aircraft are not there for redundancy, just like the power steering in your car is not a redundancy backup for the control column.

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Can you read? He wrote it 5 posts above.

 

Though I would be interested in a screenshot of relevant page, since I can't find it in what I think is relevant document

 

https://www.dropbox.com/sh/eyh14uxc89acs4j/AADFrtiutzoX6Qnu0-WkCCDka/MiG-21bis%20Manual.pdf?dl=0

 

I can read, I was just asking how you know it is a bug. Have leatherneck said so? Or are you just making assumptions based on what you have heard here? A bug implies it is not working in accordance with the designers wishes. How do you know it isn't a deliberate decision?

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Don't think so. These are scans made by Polish Aviation Museum which they kindly put on the internet.

 

I can read, I was just asking how you know it is a bug. Have leatherneck said so? Or are you just making assumptions based on what you have heard here? A bug implies it is not working in accordance with the designers wishes. How do you know it isn't a deliberate decision?

 

You must be a lawyer....

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A bug implies it is not working in accordance with the designers wishes. How do you know it isn't a deliberate decision?

 

Quoting LNS site: "The DCS: MiG-21 has been developed from the ground up with an unwavering focus on impeccable accuracy, realism and attention to detail. With full simulation of the aircraft’s systems and avionics..."

 

It is quite clear that the current implementation of aileron booster logic is incorrect. It can be corrected by enabling aileron control when the switch is in OFF position, but with greatly reduced authority. Shouldn't be a terribly hard work to do assuming the control system itself is actually modeled accurately.

 

Given that LNS is marketing "full simulation of aircraft systems" I do find that this is indeed a bug.

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