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VFW614 - overwing mounting

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Old 1st Mar 2014, 14:27
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VFW614 - overwing mounting

The VFW 614 was an unfortunate commercial failure, being unlucky with initial engine choice. Yet another in the long long line of DC-3 "replacements", it's most notable feature was the over wing mounting of the engines.
The only other example of overwing mounting of anything I can recall was the fuel tanks on some Lightnings.
Can any of our esteemed readership give me any other exampes of overwing mounting?
I can see the obvious disadvantages of putting missiles there, a misfire or jettison is going to put the flaps and tailplane at risk, but other than possibly cabin noise, I'm intrigued as to why other designers have not opted for a low-wing and mounting the engines on top.
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Old 1st Mar 2014, 14:59
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The Antonov AN-74 has engines mounted above the wings but not on pylons.
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Old 1st Mar 2014, 15:02
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The new HondaJet has OTW engines.
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Old 1st Mar 2014, 15:04
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One reason for the mounting could be that it keeps the engines away from debris. Very useful if you're planning on operations from secondary/rough strips.
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Old 1st Mar 2014, 15:14
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Lower noise footprint on the ground, shorter, lighter landing gear required, less FOD.

But how do you get at them for maintenance? Can't gravity-feed fuel.
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Old 1st Mar 2014, 15:30
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Mr Honda seems to think it's "Way to go" see hondajet.honda.com/OTWEM
-no acknowledgement of the VFW614 'tho, you would think it was purely a Honda breakthrough.
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Old 1st Mar 2014, 16:39
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Heathrow Director - Aye you are correct there, how did I forget the Antonov?


IBB
Hadn't paid too much attention to the HondaJet either. Unlikely to be able to afford one this month so it slipped my mind. I have a lottery win scheduled for April though so we'll see about it in mid May once I have the mansions sorted out.
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Old 1st Mar 2014, 16:44
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VFW614 - overwing mounting

How is it possible that no one has mentioned the Jaguar yet? Missiles on top of the wings. Great idea. I can vouch for the fact that it is quite noisy when you fire one though.
BV
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Old 1st Mar 2014, 17:58
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Do-X ? ( Amongst many other flying boats around the world.)
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Old 1st Mar 2014, 18:20
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Bob Viking - unaware of that one too - can you link me to any photos?
In view of the performance characteristics of the Jaguar, can you tell me if there was any truth in the rumour that wire-guided missiles were considered with main use of the wire being for towing said Jaguar?
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Old 1st Mar 2014, 20:50
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Smile Bird Strikes & A-10

Regarding speed....Did not the USAF A-10 have "bird strikes" from the rear?
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Old 1st Mar 2014, 21:56
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Yes, indeed, the English Electric (BAC) Lightning had over-the-wing ferry tanks and rocket pods, (rocket pods shown below):






A few more over-the-wing designs:


NASA's proposed AMELIA design, (below), has engine pods similar to the VFW 614:






The Rutan Triumph (below)

Last edited by evansb; 2nd Mar 2014 at 07:05.
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Old 2nd Mar 2014, 04:30
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While this may not qualify as an over-the-wing design, the D-21 Mach 3+ drone mounted on the Lockheed M-21 was tres avant-garde !




The AVTEKAIR 9000T certainly qualifies as an over the wing design:

Last edited by evansb; 2nd Mar 2014 at 06:54.
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Old 2nd Mar 2014, 06:53
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Goodyear's proposed G.A. 39 fighter had high mounted over wing engines:

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Old 2nd Mar 2014, 07:37
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What was the GA 39 going to fight? When was that?
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Old 2nd Mar 2014, 07:44
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As BV said, the Jaguar had overwing pylons:

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Old 2nd Mar 2014, 11:01
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From a design standpoint, wouldn't over-the-wing mounted engines at high power (e.g. take-off) cause a nose-down pitching moment that would necessitate an even larger than usual downforce required from the tail? Hence beefier tail, beefier rear fuselage, hence higher structural weight and reduced payload?

ISTR the VFW614 had aeroelasticity problems too, but I cannot remember the details.

Any designers care to comment?
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Old 2nd Mar 2014, 12:18
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VFW614 - overwing mounting

VFW614

I flew in one as a pax.

From Copenhagen (Kastup) to Sonderburg (SP). Circa 1974-5.

I'd never heard of the a/c and when I saw it, my 1st reaction was 'WTF?'

But it seemed to work
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Old 2nd Mar 2014, 12:50
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Here's another...

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Old 2nd Mar 2014, 13:49
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There is also the Custer Channelwing, although it is more like Wing Under Engine than Engine Over Wing:

https://www.google.co.uk/search?q=Cu...2F%3B400%3B261
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