Author Topic: Gannets galore  (Read 14513 times)

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Offline Rheged

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Re: Gannets galore
« Reply #15 on: June 11, 2015, 03:15:27 am »
I have a vague memory that NASA or someone like that used a Gannet for research purposes in the USA.  It might possibly have been to do with propeller testing.  I think that I have seen a picture of a Gannet aviating along with a Learjet alongside.

Questions
1 Is this just a figment of my vague memory, Imagining things
2 Would this count as a civvie Gannet
3 Who cares anyways

Your comments would be welcome, and my apologies if this leads to an attack of the thread drift virus.
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Offline Thorvic

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Re: Gannets galore
« Reply #16 on: June 11, 2015, 04:01:09 am »
Yes  NASA did use a Gannet AEW for propeller testing as it had a long pole fitted to the wing for sensors. It also had civil markings
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Offline Rheged

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Re: Gannets galore
« Reply #17 on: June 11, 2015, 04:15:05 am »
Yes  NASA did use a Gannet AEW for propeller testing as it had a long pole fitted to the wing for sensors. It also had civil markings

Thank you!!     It sounds like a refugee from Monty Python,   a Gannet with a pointed stick!!
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Offline scooter

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Re: Gannets galore
« Reply #18 on: June 11, 2015, 04:18:20 am »
Yes  NASA did use a Gannet AEW for propeller testing as it had a long pole fitted to the wing for sensors. It also had civil markings
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Offline Mossie

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Re: Gannets galore
« Reply #19 on: June 11, 2015, 04:28:03 am »
I think she also spent some time with Hamilton Standard for the prop testing that was mentioned?
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Offline PR19_Kit

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Re: Gannets galore
« Reply #20 on: June 11, 2015, 02:29:38 pm »
Why ever would they use a Gannet? Didn't they have any handy spare turbo-props of their own?  :unsure:
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Offline Captain Canada

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Re: Gannets galore
« Reply #21 on: June 11, 2015, 02:32:26 pm »
That's a new one to me ! Looks neat. Would love to see one some day...love this aeroplane !

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Offline Gondor

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Re: Gannets galore
« Reply #22 on: June 11, 2015, 04:12:07 pm »
That would be nice, Gannet AEW3 in the current NASA markings

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Offline Mossie

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Re: Gannets galore
« Reply #23 on: June 12, 2015, 01:33:30 am »
Why ever would they use a Gannet? Didn't they have any handy spare turbo-props of their own?  :unsure:

I've always assumed it was due to something unique with the contraprop layout or the Double Mamba powerplant.  I know Convair looked at using the Double Mamba to power a subscale proof-of-concept demonstrator for the Pogo, but I think that was well before this Gannet went to NASA.
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Offline PR19_Kit

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Re: Gannets galore
« Reply #24 on: June 12, 2015, 02:25:34 am »
...... but I think that was well before this Gannet went to NASA.

It would have been before the AEW3 even existed.
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Offline zenrat

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Re: Gannets galore
« Reply #25 on: June 12, 2015, 03:14:33 am »
Why ever would they use a Gannet? Didn't they have any handy spare turbo-props of their own?  :unsure:

I've always assumed it was due to something unique with the contraprop layout or the Double Mamba powerplant.  I know Convair looked at using the Double Mamba to power a subscale proof-of-concept demonstrator for the Pogo, but I think that was well before this Gannet went to NASA.

Was one Mamba connected to one prop and the other Mamba connected to the other prop?  And if so would it have been possible to rotate them at different speeds?  Could that be why they used a Gannet?
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Re: Gannets galore
« Reply #26 on: June 12, 2015, 09:53:24 am »

Was one Mamba connected to one prop and the other Mamba connected to the other prop?  And if so would it have been possible to rotate them at different speeds?  Could that be why they used a Gannet?


Yes, all Gannets were like that.

Shutting down one engine and feathering the prop to extend the cruise duration was SOP in the Fleet Air Arm.

I'm pretty sure that the only US 'double engine' like that, the T-40, had both engines geared together even when connected to a contra-prop, as in the XFY-1 Pogo etc.
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Offline zenrat

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Re: Gannets galore
« Reply #27 on: June 13, 2015, 06:40:02 am »
According to this website Gannet AEW.3 XL482 was refurbished in 1982 before being used by Hamilton Standard in the USA during 1983 for propeller vibratory stress trials.
I take "vibratory stress trials" to mean inducing vibration in the propeller to see what happens.  In which case, if the worst happened it would be useful to be able to shut down the engine running the test prop and still have the other to get home on.
« Last Edit: June 13, 2015, 07:32:12 pm by zenrat »
Fred

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Offline scooter

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Re: Gannets galore
« Reply #28 on: June 13, 2015, 07:33:30 am »
According to thi website Gannet AEW.3 XL482 was refurbished in 1982 before being used by Hamilton Standard in the USA during 1983 for propeller vibratory stress trials.
I take "vibratory stress trials" to mean inducing vibration in the propeller to see what happens.  In which case, if the worst happened it would be useful to be able to shut down the engine running the test prop and still have the other to get home on.


Plus, since its a contraprop, you don't have to worry about asymmetrical thrust or prop-induced vibration in a wing and nacelle motor mount
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Offline Captain Canada

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Re: Gannets galore
« Reply #29 on: June 13, 2015, 08:15:25 am »
Great link....lots of info there. Glad I have finally seen how the engines are positioned I has no idea !

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