Simviation Forum - Midland Air Museum

Reply #15 - Jun 1^st, 2004 at 9:30am

Hagar Offline
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Oh yeah and do you happen to know what engine powers the gannet? the intake on the front seems remeniscent of the intakes on shackleton griffon's

The Gannet is a turboprop powered by the Armstrong Siddeley "Double Mamba" gas turbine. Basically 2 single Mambas joined together. Each engine drove one prop & the Gannet could cruise on one engine. I believe it was also geared to drive both props if one engine failed. They have one of each on display in the museum. I was surprised how small they are. Pity I didn't take shots.

Here's a photo of the single Mamba. http://www.dundee.ac.uk/museum/MECHENG/3005.htm

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Reply #16 - Jun 2^nd, 2004 at 3:14pm

Crumbso Offline
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Phew you would not tell that was a prop engine. Thanks for the info 8)

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Reply #17 - Jun 2^nd, 2004 at 4:51pm

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You're welcome. This should give you a better idea of the layout. The original ASMD.1 Double Mamba as fitted to the Gannet A.S.1, the first production model.

I found this article interesting. http://www.thunder-and-lightnings.co.uk/gannet/history.html

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Reply #18 - Jun 2^nd, 2004 at 5:03pm

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Phew you would not tell that was a prop engine. Thanks for the info 8)

The main difference between a turboprop engine and a jet engine is what you hang in front (or behind) .... If you hang a prop, it's a turboprop, if not, it's a jet.

If you have a prop with, say 48 blades, enclosed in a shroud, it's a high by-pass turbofan (okay so it's a simplistic description, but, it still fits).

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Reply #19 - Jun 2^nd, 2004 at 6:04pm

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If you have a prop with, say 48 blades, enclosed in a shroud, it's a high by-pass turbofan (okay so it's a simplistic description, but, it still fits).

What do you make of this then? Is it a jet or is it a prop?

The Dowty-Rotol Islander G-FANS. Developed by Miles (R & D) & Dowty-Rotol the fans were powered by 2 standard piston engines. First flown by Sqn Leader Neville Duke from Shoreham on 10th June 1977. According to my father-in-law who worked on the project they had many vibration problems with the close-cowled fans & it was not a success. The idea was later used on the Airship Industries blimps.

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Reply #20 - Jun 2^nd, 2004 at 6:41pm

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What do you make of this then? Is it a jet or is it a prop?

The Dowty-Rotol Islander G-FANS. Developed by Miles (R & D) & Dowty-Rotol the fans were powered by 2 standard piston engines. First flown by Sqn Leader Neville Duke from Shoreham on 10th June 1977. According to my father-in-law who worked on the project they had many vibration problems with the close-cowled fans & it was not a success. The idea was later used on the Airship Industries blimps.

That is, of course, a proper piston engined experiment.

Felix/FFDS

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Reply #21 - Jun 2^nd, 2004 at 7:06pm

Hagar Offline
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That is, of course, a proper piston engined experiment.

I understand it was termed a "ducted propulsor". You live & learn. Roll Eyes

http://www.gloster.pwp.blueyonder.co.uk/archive/fans.htm

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Reply #22 - Jun 3^rd, 2004 at 9:51am

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Too bad about the rain, the pics turned out nice though. And speaking of Gannets and Shackletons are there any of either avialable for FS?

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Reply #23 - Jun 3^rd, 2004 at 10:05am

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[quote author=Hagar link=board=photos;num=1085890291;start=15#19 date=06/02/04 at 18:04:59]
What do you make of this then? Is it a jet or is it a prop?

I see this as no different from the ducted fans which many modelers use to power their model "jets" .........its still a much cheaper alternative to the pure " Turbine " which has come on scene in the past 10 yrs now.......

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