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Where ´s The CG Of This Aircraft?  
User currently offlineMASB747 From , joined Dec 1969, posts, RR:
Posted (12 years 2 weeks 1 day 16 hours ago) and read 3047 times:

Just take a look at these 2 aircraft (IL-38 and reg.IL-18)

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Photo © Alastair McBean
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Photo © Wolfgang Bergemann

Now the plane on the 1st pic looks quite ´unbalanced´and tailheavy to me,why did they move it´s center of gravity forward and what prevents it from sitting on it´s tail since it doesn´t seem to have a tailskid ? Does the radar equipment behind the nose gear need that extra counterweight due to it´s sheer mass ?

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User currently offlineBio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 1, posted (12 years 2 weeks 9 hours ago) and read 2787 times:

...why did they move it´s center of gravity forward and what prevents it from sitting on it´s tail since it doesn´t seem to have a tailskid...

If they don't move it forward, the aircraft will sit on its tail. The tailskid is not something that should be on aircraft to prevent them from sitting, but for tailstrikes during takeoffs. Aircraft should be properly loaded at all times to prevent inclination from happening, and it could happen to all aircraft that permit aft cargo (or pax) loading. I hope this helps a bit


User currently offlineAirplay From , joined Dec 1969, posts, RR:
Reply 2, posted (12 years 2 weeks 7 hours ago) and read 2774 times:

The CG of aircraft are always located in a small range around the centre of lift of the wing. These aircraft are no different. The four engines likely provide a fair amount of weight to counteract the long cabin and I would guess that there isn't much loaded in the back.

Fuel in the wing tends to have very little effect on CG.

User currently offlineL-188 From United States of America, joined Jul 1999, 30015 posts, RR: 58
Reply 3, posted (12 years 2 weeks 4 hours ago) and read 2757 times:

They did move that wing quite a bit forward on that aircraft.

Probably the front end is quite a bit heavier due to the weight of that radome and it's associated electronics and power systems. The Soviets where great for still using vacume tubes and such. Those types of systems and the transformers needed to power them are not exactly light.

Also keep in mind that since it is a patrol plane with a much smaller number of people on board a smaller CG range is acceptable since there is going to be less variations in the number of passengers, configuration and ect.

User currently offlineMASB747 From , joined Dec 1969, posts, RR:
Reply 4, posted (12 years 1 week 6 days 18 hours ago) and read 2719 times:

My guess is that the rearmost part of the main cabin isn´t used at all since it is too far away from the center of gravity.
Freight hauling and the stuff wasn´t really the purpose this derivative of the IL-18 was designed for anyway.

User currently offlineDelta-flyer From United States of America, joined Jul 2001, 2676 posts, RR: 6
Reply 5, posted (12 years 1 week 5 days 21 hours ago) and read 2674 times:

I suspect the reason for the long, probably empty rear end is to get the tail antenna boom sufficiently far away from the radar electronics near the nose.


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