RR Tyne AS.57 Ambassador : test-bed only, the left wing had the standard Centaurus piston engine. The same aircraft was also a test-bed for the earlier Napier Eland turboprop.



https://encrypted-tbn1.gstatic.com/i...EgcTd-lKS4_LyF

A late production B-17 converted to turboprop testbed. Boeing converted three ships, one each for Allison, Curtiss-Wright, and P&W. Identified as model 299Z.

http://upload.wikimedia.org/wikipedi...d_NAN10-50.jpg

The pictured ship is P&W's with T34 in the nose. This ship was eventually converted back to B-17G configuration, named "Liberty Belle", & operated as a demo aircraft for a few years, but suffered a #2 fuel tank leak and inflight fire, 13 June 2011. Liberty Belle made a successful forced landing near Oswego, Illinois, but was destroyed by fire.

Aero Commander and Jet Commander

Someone said B-36/YB-60. There was also the YB-35/YB-49.

B1 - that B-17 photo is remarkable: only the nose-mounted prop is in action, the conventional other 4 appear to be fully feathered!
Dean

Type 445 Wellington used to test the Whittle W2B/23 turbojet engine, the engine was fitted in the tail of the aircraft

Type 470 and Type 486 Wellington fitted with Whittle W2B and W2/700 respectively

Type 602 Wellington Mark X fitted with two Darts

We could be here for a very long time ...

Ha, ha, great isn't it. Remind you of anything?.....

http://i1297.photobucket.com/albums/...psbwmoimuo.jpg

Avro Tudor 8 anyone? It started life as a Tudor 1 with four Merlins.

IMO it actually looks quite pretty from the front, when that great barn door of a fin is less obvious.

http://www.vicflintham.co.uk/content...types/tud8.jpg

There were also the Unducted Fan* testbeds that were tried a few years back. They must surely, at least loosely, fit the description of turboprop.

GE had one on an MD-80 whilst P&W used a 727 for their 'Propfan'.


http://www.propilotmag.com/archives/..._2_09/GE36.jpg

*Someone at the time commented, "Unducted fan tells you what it isn't, not what it is."

Coming right up to date and an aircraft that made it off the drawing board, I'm surprised the Dornier do328 hasn't yet made an appearance on the thread. Single airframe available as either a turboprop or jet, production is about to restart.

Turkey To Build Dornier 328 And 328Jet | Paris Air Show 2015 content from Aviation Week



JAS

#31

#1

Ho Hum....... :)

D-Oh! :ouch:

:\

JAS

JAS
It happens to all of us mate! :)
H.

I was heading back to Swinderby in a Vampire FB9 when I overtook a Dart powered DC3 at around 30,000 feet. It happened near Nottingham (Hucknall?) in mid 1957.

The GE UDF was not only unducted, it was ungeared. Two interposed, counterrotating (contrarotating across the pond) turbines directly drove the two fan rotors.

I knew Art Adamson, the genius engineer who invented this configuration. He was personable, played tennis into his 90s, always loved to talk about his introduction to aviation as a pre-teen in farm country.

Only disadvantage I could see was - It had four separate rotors. Per FAR 25, each engine required four tachs. . . :rolleyes:

The main disadvantage of the GE UDF was one you could hear, not see. :O

Thanks for the picture of the Ryan Fireball FR1, DaveReidUK. It was the first aircraft to fly onto the deck under jet power alone, a month before 'Winkle' Brown flew the Sea Vampire on to HMS Ocean.

Sure, but only because the piston engine packed up in the circuit and the pilot fortunately managed to get the auxiliary jet fired up in time for an unplanned pancake on to the carrier.

Oh absolutely, Haraka. But it was still the first jet deck-landing!