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TU-114

Old 29th Jun 2022, 16:31
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TU-114

I read very recently, that during a visit by Nikita Khrushchev to Andrews Air Force Base in 1959, the steps they provided were not high enough to permit egress from the aircraft, so a makeshift ladder had to be provided, which led me to wonder - just how high is the sill on a TU-114? Does anyone know?


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Old 29th Jun 2022, 19:55
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If this was a quiz, 18ft. 8 1/2in would be my answer... so a tad more than the prop diameter
Don't know if there's a jury here, to decide on the winner, though
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Old 30th Jun 2022, 13:45
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Whilst I donít doubt your 18í guesstimate judging from the picture, in reality it surely only needs to be more than the radius of the propellor?
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Old 30th Jun 2022, 14:36
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If I understood the OP's question correctly, it's the height (AGL) of the doorsill.
So I don't see the link with the prop radius (except as a useful reference for guesstimating). Had the airframe been a shoulder mounted wing design, prop radius & ground clearance, MLG height, etc would all have remained (largely) unchanged, but the doorsill height AGL would have dropped dramatically.
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Old 30th Jun 2022, 19:15
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Originally Posted by DIBO View Post
If I understood the OP's question correctly, it's the height (AGL) of the doorsill.
So I don't see the link with the prop radius (except as a useful reference for guesstimating). Had the airframe been a shoulder mounted wing design, prop radius & ground clearance, MLG height, etc would all have remained (largely) unchanged, but the doorsill height AGL would have dropped dramatically.
Yes, that was the basis of the question. I understand the radius of the props was 5.6 m (18 ft 4 in), so given some greater than normal ground clearance, bearing in mind the speed at which those propeller tips rotated, as a general scale, we must be looking at about 18ft or more.
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Old 30th Jun 2022, 20:31
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Would have thought Aeroflot who supplied the ground handling Airstair to Andrews would have sent ones the correct size.
Poss Cap Comp picture ..
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Old 30th Jun 2022, 20:40
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Originally Posted by Kiltrash View Post
Poss Cap Comp picture ..
Well, Khrushchev was a [email protected] just like Putin...
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Old 30th Jun 2022, 22:51
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Originally Posted by Kiltrash View Post
Would have thought Aeroflot who supplied the ground handling Airstair to Andrews would have sent ones the correct size.
Poss Cap Comp picture ..
Not quite sure what a Cap Comp picture is, but what I do know is that the Tu-114 presented a problem wherever it went, because of the sill height, which is perhaps why it didn't get about too much! .
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Old 1st Jul 2022, 04:49
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Bearing the above in mind, perhaps they carried an extension in the cargo hold to alleviate the high door-sill conundrum ?
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Old 1st Jul 2022, 05:36
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Regarding TU114 the following information can be found from the interweb:
"It has an external length of 54.1 meters, an external height of 8.2 meters, and a fuselage diameter of 3.3 meters. The tail height is 15.44 meters and the wheelbase is 21.3 meters. It has a wingspan of 51.1 meters and a wing area of 311.4 square meters. The aircraft has an empty weight of 91,000 kg, a gross weight of 164,000 kg, a maximum takeoff weight of 171,000 kg, and a fuel tank capacity of 19,280 US gal."

"It produces a maximum takeoff thrust of 14,795 hp each and drives eight-bladed AV-60N contra-rotating reversible pitch propellers with a diameter of 5.6 meters."

So, fuselage 3,3m and external height 8,2m doesn't give the exact door sill height, but one could estimate the door sill being somewhere around 6,0m height, based on pictures of the AC and the 1L location.
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Old 1st Jul 2022, 09:07
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Originally Posted by barry lloyd View Post
Yes, that was the basis of the question. I understand the radius of the props was 5.6 m (18 ft 4 in), so given some greater than normal ground clearance, bearing in mind the speed at which those propeller tips rotated, as a general scale, we must be looking at about 18ft or more.
A prop radius of 5.6m would be scary... a prop diameter of 5.6m is somewhat more likely.
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Old 1st Jul 2022, 09:17
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Originally Posted by UnderASouthernSky View Post
A prop radius of 5.6m would be scary... a prop diameter of 5.6m is somewhat more likely.
Thank you for correcting my English.
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Old 1st Jul 2022, 09:18
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Originally Posted by SpringHeeledJack View Post
Bearing the above in mind, perhaps they carried an extension in the cargo hold to alleviate the high door-sill conundrum ?
I wondered about this, too - along with a towbar, I imagine!
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Old 1st Jul 2022, 09:56
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Wouldn't a fast large long range turboprop like this be a promising concept for today? At least more promising than battery powered or hydrogen? Although there are not that many engines available to pick from except for the Allison AE2100D3 and the exotic Europrop TP400.
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Old 11th Jul 2022, 07:38
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Originally Posted by Less Hair View Post
Wouldn't a fast large long range turboprop like this be a promising concept for today? At least more promising than battery powered or hydrogen? Although there are not that many engines available to pick from except for the Allison AE2100D3 and the exotic Europrop TP400.
Yeah, it's a bit like the prop fan that MD had on the go, but in reality the fuel saving is now minimal against the ultra high bypass turbo fans that have been developed and the are much, much quieter.
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Old 11th Jul 2022, 17:06
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Originally Posted by Less Hair View Post
Wouldn't a fast large long range turboprop like this be a promising concept for today? At least more promising than battery powered or hydrogen? Although there are not that many engines available to pick from except for the Allison AE2100D3 and the exotic Europrop TP400.
I believe new and reconditioned NK-12s are still available from Kuznetsov in Sammara. Not sure they take credit/debit cards or PayPal at the moment !
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