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Il-62 Rear Support Wheel?  
User currently offlineAlessandro From , joined Dec 1969, posts, RR:
Posted (7 years 7 months 5 days 4 hours ago) and read 5871 times:

Can the Il-62 taxi with the rear support wheel folded out?
If yes, any speed limitations?

14 replies: All unread, jump to last
 
User currently offlineHAWK21M From India, joined Jan 2001, 31702 posts, RR: 56
Reply 1, posted (7 years 7 months 5 days 4 hours ago) and read 5855 times:


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The Rear Tail support Wheel is for avoiding a tilt on ground.
regds
MEL



Think of the brighter side!
User currently offlineOV735 From Estonia, joined Jan 2004, 914 posts, RR: 3
Reply 2, posted (7 years 7 months 5 days 4 hours ago) and read 5830 times:

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.


User currently offlineFlyorski From United States of America, joined Dec 2004, 996 posts, RR: 1
Reply 3, posted (7 years 7 months 5 days 4 hours ago) and read 5812 times:

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?



"None are more hopelessly enslaved, than those who falsly believe they are free" -Goethe
User currently offlineFlySSC From United States of America, joined Aug 2003, 7422 posts, RR: 57
Reply 4, posted (7 years 7 months 5 days 2 hours ago) and read 5694 times:

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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User currently offlineBohica From United States of America, joined Feb 2004, 2740 posts, RR: 0
Reply 5, posted (7 years 7 months 4 days 19 hours ago) and read 5435 times:

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 The tail wheel was retracted just prior to pushback.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.

User currently offlineLTU932 From Germany, joined Jan 2006, 13864 posts, RR: 50
Reply 6, posted (7 years 7 months 4 days 19 hours ago) and read 5405 times:

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).


User currently offlineDH106 From United Kingdom, joined Jun 2005, 626 posts, RR: 1
Reply 7, posted (7 years 7 months 4 days 5 hours ago) and read 5154 times:

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


...I watched c-beams glitter in the dark near the Tanhauser Gate....
User currently offlineAvianca From Venezuela, joined Jan 2005, 5934 posts, RR: 40
Reply 8, posted (7 years 7 months 4 days 5 hours ago) and read 5152 times:

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



Colombia es el Mundo Y el Mundo es Colombia
User currently offlineLegacy135 From Switzerland, joined May 2005, 1052 posts, RR: 26
Reply 9, posted (7 years 7 months 3 days 23 hours ago) and read 5014 times:

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.

Cheers
Legacy135  Wink


User currently offlineCIO666 From United States of America, joined Feb 2006, 26 posts, RR: 0
Reply 10, posted (7 years 7 months 3 days 15 hours ago) and read 4870 times:

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.

User currently offlineAlessandro From , joined Dec 1969, posts, RR:
Reply 11, posted (7 years 7 months 3 days 7 hours ago) and read 4751 times:

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.

User currently offlineQantas744ER From United States of America, joined Jun 2005, 1294 posts, RR: 4
Reply 12, posted (7 years 7 months 2 days 19 hours ago) and read 4545 times:

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...

Leo



Happiness is V1 in Lagos
User currently offlineOV735 From Estonia, joined Jan 2004, 914 posts, RR: 3
Reply 13, posted (7 years 7 months 2 days 3 hours ago) and read 4420 times:

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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Cheers,
OV735


User currently offlineHAWK21M From India, joined Jan 2001, 31702 posts, RR: 56
Reply 14, posted (7 years 7 months 2 days 3 hours ago) and read 4407 times:



Nice video link.


Walk Around Video.

regds
MEL

[Edited 2007-05-01 13:02:00]


Think of the brighter side!
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