Boeing Chinook Projects

hesham

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Hi,


and here is a comparison between Chinook 234UT and 234LR drawings.


Air International 7/1979
 

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hesham

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Hi,


I don't know if this concept was developed from Chinook or just a hypothetical
design ?.


Вертолеты. Выбор параметров при проектировании - 1976
 

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bigvlada

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Boeing HLH is mentioned, but the text says it's on the picture 2.55 and this is 2.57.
 

hesham

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bigvlada said:
Boeing HLH is mentioned, but the text says it's on the picture 2.55 and this is 2.57.

Thank you my dear Bigvlada,


and maybe it was unknown version ?.
 

hesham

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Hi,


and a compound Chinook;


http://www.slideshare.net/ChristianFranciscoMe/12112218-rotorcraftbacktofuturedavis
 

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Grey Havoc

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https://www.flightglobal.com/news/articles/honeywell-pitches-upgraded-t55-engine-for-chinook-430086/
 

fightingirish

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Gareth Jennings said:
@USArmy briefing slide shows two notional Block 3 concepts for @BoeingDefense #Chinook. One seemingly geared towards increased lift, the other towards high-speed flight. Story on Block 3 timelines and possible tech to come...
Twitter: https://twitter.com/GarethJennings3/status/1024568358430289920
Article: https://www.janes.com/article/82113/us-army-discloses-timelines-for-block-3-chinook
 

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Colonial-Marine

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Hmm, seems to me that once you start throwing on extra engines and turning the CH-47 into a compound helicopter that maybe you should just start with a clean sheet large tilt-rotor or something else where less compromises would be necessary.
 

hesham

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Nice find my dear Rolf.
 

TomcatViP

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The CH-47 was already tested with a set of wing mounted in the center fuselage and experiments showed that there was no advantages in term of efficiency (with in fact a significant loss during hover and slow speed flight). thanks to the tandem rotors having overlapping discs. See Boeing BV-347




Source (picture):
disneo-art.com
Source (History):
http://www.chinook-helicopter.com/history/aircraft/A_Models/65-07992/65-07992.html
 

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That might change with additional propulsion propellers. Unloading the rotors and use most (all?) of power on the propellers would give the additional wings a different perspective. Make them foldable/turnable in hover would solve that issue too.
 

yasotay

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Racer said:
That might change with additional propulsion propellers. Unloading the rotors and use most (all?) of power on the propellers would give the additional wings a different perspective. Make them foldable/turnable in hover would solve that issue too.
Like most things as they get older, weight. Chinook has been weight challenged for a long time already. Last two mods (I may be wrong here) have done little more than regain the lift weight it Chinook is suppose to have by specification.
 

Mark Nankivil

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Recently had a MH-47G drop in for fuel at our local airport. Just look at all the add ons that add to the weight challenge.....

Enjoy the Day! Mark
 

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yasotay

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Mark Nankivil said:
Just look at all the add ons that add to the weight challenge.....
Enjoy the Day! Mark
Ain't got nothin' on the drag queen!

Hope its working now...
 

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AeroFranz

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Anyone else having trouble with the picture? Yasotay, can you re-upload please?
[edit: thanks for reupload!]
 

fightingirish

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TomcatViP

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Flatter Fuel tanks reduce the DeltaP loss due High pressure air impacting the airframe body under the disk rotor. That allows for an extra power available for lift, hence ctrl trim ext...
On average up to 8 to 10% of power is lost under the disc.

Move of frwd landing gear give us a hint of the structural changes (from Al to CRFP).
 

galgot

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Agreed… the RDF due to the Alpha-R of the compared rotor diameter hyperbolic cosine helps a lot. With full trim , of course.

Btw, Are you sure the tanks are flatter ?
 

TomcatViP

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Oh God Galgot, forget about me... The Chinook team results made a very good engineering book... worth a read.
 

galgot

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Oh God Galgot, forget about me... The Chinook team results made a very good engineering book... worth a read.
:p I just love when you call me "God Galgot".
Where can i get that book please ? (Serious question).
 
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yasotay

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They told us unibrow types, "more fuel good. Like G model, good, good, you buy"
 

RavenOne

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Slightly digressing, newly formed joint venture Coulson-Unical brought their first CU-47 Helitanker (formerly army CH-47D) to Heli Expo back in Feb in Atlanta. Several more being converted as we speak so aiming for five by 2020 summer. My photos below from both static and departing the show.

Cheers

BFDF3C8C-8561-49E5-BDFE-F3F1FCA62DD9.jpeg0EEDBDF5-C845-4987-BE07-2F365EC348E4.jpeg189090D3-6DE4-46A9-A262-CBCD1DEC49DA.jpeg41B2845A-A731-425B-88E1-C3202AAA7EDC.jpeg41B2845A-A731-425B-88E1-C3202AAA7EDC.jpeg2E713F3D-CF35-4CF2-A26A-C6CCF8EFED77.jpegA2CDA2B1-EA08-4926-807B-9167C1DF8C1D.jpegCC511B7E-CA71-429F-8747-D3F0F5BC7CB7.jpegAEE98A96-DCF3-49EC-8734-B007F132858B.jpeg8BAA6065-DAAD-4982-B1DD-E75F8566F413.jpeg
 

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Mark Nankivil

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Slightly digressing, newly formed joint venture Coulson-Unical brought their first CU-47 Helitanker (formerly army CH-47D) to Heli Expo back in Feb in Atlanta. Several more being converted as we speak so aiming for five by 2020 summer. My photos below from both static and departing the show.

Cheers

View attachment 614355View attachment 614357View attachment 614358View attachment 614359View attachment 614359View attachment 614360View attachment 614361View attachment 614362View attachment 614363View attachment 614364
Fine looking Chinook - they have done much the same to their C-130 fire tankers.

Thanks! Mark
 

TomS

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From L+K 2/1968.
This is a Sea Knight (Boeing-Vertol 107) not a Chinook (Boeing-Vertol 114).


Edit: However, I did find a mention that this aircraft was modified with stub wings, etc in support of the Model 347 program, before being modified back and sold to the Swedes as a Bv.107II-15.

 

Maiwand1880

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That might change with additional propulsion propellers. Unloading the rotors and use most (all?) of power on the propellers would give the additional wings a different perspective. Make them foldable/turnable in hover would solve that issue too.
The Model 347 wings had hydraulically-powered variable incidence, that changed automatically throughout the flight enveloppe . They could raise to a full vertical position for VTOL and lifting. CH-47A 65-07992 (CN B-164) was given many other heavy modifications in order to become Model 347: 2,79m longer fuselage, 4-bladed rotors with 0,76m longer blades, 0,77m higher rear pylon, electric flight controls, more powerful -11 engines, a retractable nacelle with rear facing controls that could be lowered through the hold floor for lifting operations (it was also meant as a test-bed for XCH-62A technologies). It seems that performances and stability were better, payload higher and vibrations less, but at higher acquisition and maintenance costs. HLH failed and some of the improvements found their way in the CH-47D and further Chinook developments.
 

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