Alessandro
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Il-62 Rear Support Wheel?

Sat Apr 28, 2007 6:24 pm

Can the Il-62 taxi with the rear support wheel folded out?
If yes, any speed limitations?
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HAWK21M
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RE: Il-62 Rear Support Wheel?

Sat Apr 28, 2007 6:35 pm


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The Rear Tail support Wheel is for avoiding a tilt on ground.
regds
MEL
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OV735
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RE: Il-62 Rear Support Wheel?

Sat Apr 28, 2007 6:44 pm

My guess is that it probably can taxi, otherwise they wouldn't have installed it as a wheel but a simple support pole.

It also protects the aircraft from tailstrikes.
 
flyorski
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RE: Il-62 Rear Support Wheel?

Sat Apr 28, 2007 7:02 pm

Quoting OV735 (Reply 2):
My guess is that it probably can taxi,

I think that this is correct. What other aircraft have rear support wheels?
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FlySSC
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RE: Il-62 Rear Support Wheel?

Sat Apr 28, 2007 9:14 pm

Quoting Flyorski (Reply 3):
What other aircraft have rear support wheels?

Though without a wheel, the SE-210 Caravelle also used to have a rear support to prevent tailstrike on the ground when loading :


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bohica
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RE: Il-62 Rear Support Wheel?

Sun Apr 29, 2007 3:30 am

When Aeroflot used to operate the IL-62 into IAD, I noticed they would drop the tail wheel as they made the turn into the gate. The tail wheel was retracted just prior to pushback. I never saw it taxi with the tail wheel down outside the gate.
 
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LTU932
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RE: Il-62 Rear Support Wheel?

Sun Apr 29, 2007 3:42 am

Quoting Alessandro (Thread starter):
Can the Il-62 taxi with the rear support wheel folded out?

Certainly. I guess since the IL-62 is very tailheavy, probably more tailheavy than other aircraft with tailmounted engines (e.g. the VC-10, TU-154, B727), it actually needs that support wheel, or else it could tip up and have a tailstrike when the CG is too far aft.

Quoting Alessandro (Thread starter):
If yes, any speed limitations?

I don't know the specs, but I guess it would be standard taxi speed limits (unless Soviet taxi procedures were much more different than Western procedures).
 
DH106
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RE: Il-62 Rear Support Wheel?

Sun Apr 29, 2007 6:10 pm

Also noticable is that the tail wheels don't fully retract - about half the wheel diameter is left exposed, so I wonder if it doubles as a tailskid to prevent over-rotation on landing/TO
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Avianca
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RE: Il-62 Rear Support Wheel?

Sun Apr 29, 2007 6:13 pm

Quoting OV735 (Reply 2):
It also protects the aircraft from tailstrikes.

but only on the loading process or?

Quoting FlySSC (Reply 4):
Though without a wheel, the SE-210 Caravelle also used to have a rear support to prevent tailstrike on the ground when loading :

also the good old 74M use it while the cargo is loaded
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legacy135
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RE: Il-62 Rear Support Wheel?

Sun Apr 29, 2007 11:40 pm

All I am going to write down now is speculation, based on 20 years in aviation on different types of airplanes. So my imagination goes this way:

A loaded IL62 would not use the wheel, as the load brings the aircraft in to balance. Otherwise it would simply not be flyable, as the Centre of Gravity would be ways out of permissible range. If the plane is on low load or for ferry flights, they probably need to bring ballast into the forward section of the plane. So the aircraft is basically held in it's balance by the engines rear of the wing and the load, mainly forward of the wing. If the aircraft isn't loaded, it probably could fall on it's tail.

So if they need the aircraft to tow on ground or taxi to maintenance etc. it seems that they need to have this wheel for. However, I think it has to be used carefully for taxi, as the fuselage could otherwise be bended, what is worst, that could happen to an aircraft.

Another aspect for the wheel: The IL62 is a long range aircraft, so taking considerable amounts of fuel. If you choke an aircraft's nose-wheel and the main-wheels or put the breaks on, the aircraft can dis-stress considerably into the chokes during fueling. This can in the extreme be that much, that the chokes get nearly impossible to remove or a risk for damage to the structure is there. So having a wheel is very smart, as the fuselage can dis-stress under the load.

Still, all I wrote now here, is speculation. Maybe somebody familiar with Russian aircrafts can bring in some professional knowledge.

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cio666
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RE: Il-62 Rear Support Wheel?

Mon Apr 30, 2007 7:48 am

As Legacy135 points out, an aircraft that needs an extra tail support wheel to prevent tipping during taxi would be outside of its legal weight and balance limit to fly, and would probably be fatal to anyone unlucky enough to be on board or nearby when said aircraft stalled and crashed. The tail wheel is for imbalances during loading. When the plane pulls into the gate, the passengers depart from the front of the aircraft. After the first 20 rows clear out, the front is very light, and the fuel tanks are relatively empty, but the rear, with 4 engines and a bunch of passengers still waiting to deplane is heavy. This is when the tail prop is needed. After the plane is refueled (providing balast to balance the aircraft), the passengers and cargo are loaded and the weight and balance are checked, the aircraft should be balanced enough to retract the tail prop and taxi safely.
 
Alessandro
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RE: Il-62 Rear Support Wheel?

Mon Apr 30, 2007 4:06 pm

Cl0666, sure but what if you want to move the aircraft around with all liuggage still in the plane, no pure cargo version as I´m aware of the Il-62.
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Qantas744er
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RE: Il-62 Rear Support Wheel?

Tue May 01, 2007 3:47 am

Quoting Avianca (Reply 8):
also the good old 74M use it while the cargo is loaded

Right! but that was a pole fixed under the tail just like on the 744F. It is not a internat pole that comes out of the tail...

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OV735
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RE: Il-62 Rear Support Wheel?

Tue May 01, 2007 7:53 pm

Quoting Avianca (Reply 8):
Quoting OV735 (Reply 2):
It also protects the aircraft from tailstrikes.

but only on the loading process or?

Even when retracted, the wheel itself is still partially outside the fuselage line, and engineered to protect the tail structure in case of over-rotation:


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OV735
 
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HAWK21M
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RE: Il-62 Rear Support Wheel?

Tue May 01, 2007 8:01 pm



Nice video link.


Walk Around Video.

regds
MEL

[Edited 2007-05-01 13:02:00]
I may not win often, but I damn well never lose!!! ;)