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Date: Feb 17, 2012
Gnome engine
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hmm

De Havilland Gnome Engine Whirlwind Helicopter (1960)



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Date: Feb 19, 2012
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Wow,is that heli a Sikorsky model?...Gnome engine is basically a radial engine,rite?...quite huge...the engine occupies almost all the fuselage portion of the heli,isn't it?...

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Date: Feb 19, 2012
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That's the Westland Whirlwind, a British version of the Sikorsky S-55.

Only the HAR.7s and later models used the Gnome turboshaft.



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Date: Feb 21, 2012
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Leela,if you are saying that it is the British version of S-55 and only the later models used turbine engine,then what's that inside the nose of that helo?...doesn't it look like an air intake of a turboshaft engine?...

Looking closely behind the thing,there is something like a radial engine...is that engine having its intake port designed like a turboshaft?....

Tsheten8

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Date: Feb 21, 2012
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tseten8, what you are looking at is in fact the Gnome turboshaft engine, as the ad clearly states. Though the picture is in terrible quality. See my attached images for a better look.



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Date: Feb 21, 2012
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tsheten8 wrote:

Looking closely behind the thing,there is something like a radial engine...is that engine having its intake port designed like a turboshaft?


 That would be a neat trick given radial engines don't have intakes like turboshafts because they work completely different.



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Date: Feb 21, 2012
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Here's some cutaways and diagrams of the H.1000, the first production version of the Gnome used in the later Whirlwinds:

http://www.gasturbine.pwp.blueyonder.co.uk/gnome.htm

 

For some fun trivia, the Gnome series of Rolls-Royce engines were developed from the General Electric T58, originally used with helicopters such as the Sikorsky HH-3F and so on.



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Date: Feb 21, 2012
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fluttercopter wrote:
tsheten8 wrote:

Looking closely behind the thing,there is something like a radial engine...is that engine having its intake port designed like a turboshaft?


 That would be a neat trick given radial engines don't have intakes like turboshafts because they work completely different.


 

While true, I seem to remember a short span of radial engines that had some kind of ringed air intake at the direct center, where the propeller would be. I saw photos of the engine used on a still unidentified fighter design, but it is still unclear to me what exactly the configuration was.



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Alan Dallas


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Date: Feb 21, 2012
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You don't say? I'd really like to see that.



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Date: Feb 21, 2012
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Gunship wrote:
fluttercopter wrote:
tsheten8 wrote:

Looking closely behind the thing,there is something like a radial engine...is that engine having its intake port designed like a turboshaft?


 That would be a neat trick given radial engines don't have intakes like turboshafts because they work completely different.


 

While true, I seem to remember a short span of radial engines that had some kind of ringed air intake at the direct center, where the propeller would be. I saw photos of the engine used on a still unidentified fighter design, but it is still unclear to me what exactly the configuration was.


 

Either you're talking about a standard turboprop engine, or you're referring to the dead attempts at ducted prop-spinners around the late 40's.

Regarding the latter, there were some that resembled intakes like a turbojet at the center of the propeller, while others were just small vents along the sides of the spinner. Most of the engines were in fact radial. It was an experiment to reduce drag by ducting the air to the engine. 

It work great with some aircraft, others had cooling problems (ironically), but what really killed the idea was the fact it caused to much of a problem for engine maintenance. Not to mention it was expensive to produce.



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Date: Feb 21, 2012
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This Arado Ar-240 is one example I can find.



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Date: Feb 21, 2012
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Ah, here's a better example, a Hawker Tempest V powered by a Sabre IIB.



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Date: Feb 22, 2012
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SuperStallion wrote:

Either you're talking about a standard turboprop engine, or you're referring to the dead attempts at ducted prop-spinners around the late 40's.

Regarding the latter, there were some that resembled intakes like a turbojet at the center of the propeller, while others were just small vents along the sides of the spinner. Most of the engines were in fact radial. It was an experiment to reduce drag by ducting the air to the engine. 

It work great with some aircraft, others had cooling problems (ironically), but what really killed the idea was the fact it caused to much of a problem for engine maintenance. Not to mention it was expensive to produce.


 

You could be right. Now that I think about it that does make more sense. Thanks.



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Alan Dallas


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Date: Feb 22, 2012
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SuperStallion wrote:
Gunship wrote:
fluttercopter wrote:
tsheten8 wrote:

Looking closely behind the thing,there is something like a radial engine...is that engine having its intake port designed like a turboshaft?


 That would be a neat trick given radial engines don't have intakes like turboshafts because they work completely different.


 

While true, I seem to remember a short span of radial engines that had some kind of ringed air intake at the direct center, where the propeller would be. I saw photos of the engine used on a still unidentified fighter design, but it is still unclear to me what exactly the configuration was.


 

Either you're talking about a standard turboprop engine, or you're referring to the dead attempts at ducted prop-spinners around the late 40's.

Regarding the latter, there were some that resembled intakes like a turbojet at the center of the propeller, while others were just small vents along the sides of the spinner. Most of the engines were in fact radial. It was an experiment to reduce drag by ducting the air to the engine. 

It work great with some aircraft, others had cooling problems (ironically), but what really killed the idea was the fact it caused to much of a problem for engine maintenance. Not to mention it was expensive to produce.


 

Cool! I didn't even know about these. How many aircraft were tested with it?



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Date: Feb 28, 2012
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That's what I was thinking too, it made no sense that a radial engine would have that design feature.



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Posts: 305
Date: Mar 7, 2012
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Gunship wrote:
fluttercopter wrote:
tsheten8 wrote:

Looking closely behind the thing,there is something like a radial engine...is that engine having its intake port designed like a turboshaft?


 That would be a neat trick given radial engines don't have intakes like turboshafts because they work completely different.


 

While true, I seem to remember a short span of radial engines that had some kind of ringed air intake at the direct center, where the propeller would be. I saw photos of the engine used on a still unidentified fighter design, but it is still unclear to me what exactly the configuration was.


 

By the way I think SuperStallion solved your mystery fighter. Is it the Hawker Tempest V in his last post?



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Date: Mar 7, 2012
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VinceJ wrote:
Cool! I didn't even know about these. How many aircraft were tested with it?

 

Just the two aircraft I posted earlier AFAIK, but there might be more. Not sure if the Japanese had an equivelant or not.



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Date: Mar 9, 2012
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We now have a thread on ducted prop-spinners, so lets move this conversation over there:

http://stingraysrotorforum.activeboard.com/t48202611/ducted-prop-spinners/



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Date: Mar 12, 2012
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Does anyone know where I can find pictures of the Agusta-Bell 205BG prototype with Gnome H-1200 turboshafts?



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Date: Mar 29, 2012
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Fireblade88 wrote:

Does anyone know where I can find pictures of the Agusta-Bell 205BG prototype with Gnome H-1200 turboshafts?


 

;)



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Date: Apr 14, 2012
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De Havilland Gnome Aircraft Engine (1959)



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