PPRuNe Forums - World Speed Record Event 11th August @Helicopter Museum

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heli1

7th August 2019 08:45

World Speed Record Event 11th August @Helicopter Museum

This Sunday ,11th August marks the 33rd anniversary of G-LYNX breaking the world helicopter speed record,which it still holds today.The Museum Chairman( who was present at the time) will be giving a talk on this achievement in front of the aircraft at 11.00 hours,with Clive Guest ,the crew chief for the helicopter, also invited to be present.(We will also explain the rules and why helicopters with jet engines and propellers strapped on don't count in this record category).
It's also Navy Wings weekend at the museum and as the weather forecast for Weston-super-Mare and the southwest generally is b****y awful it might be a good indoor option for the day!

[email protected]

7th August 2019 11:02

Will they mention that the G-Lynx jet-pipes were modified to be slightly convergent ducts so they did provide some propulsive thrust?

Brilliant Stuff

11th August 2019 13:15

The exhausts were mentioned but only in so far that they were no longer pointing to the side instead straight out back but they would not add to the propulsion. This was made clear.

[email protected]

11th August 2019 21:10

Not what I was told by some who should know. It doesn't really matter since the blades were the biggest contributor to the performance.

MightyGem

11th August 2019 21:18

According to this article,

Quote:

The engines’ exhausts were modified to provide 600 pounds of thrust (2,669 Newtons).

https://www.thisdayinaviation.com/ta...1-lynx-g-lynx/

atakacs

11th August 2019 21:53

I'd venture to say that this record still stands because it is pretty much impossible to get a faster "classic" rotorcraft (I understand that the tips where traveling very close to mach 1).

[email protected]

12th August 2019 06:40

Thanks MG - that's how I remembered it:ok:

dangermouse

12th August 2019 07:28

Exhaust mods

Quote:

Originally Posted by [email protected] (Post 10542938)

Thanks MG - that's how I remembered it:ok:

Actually in order to reduce drag the exhausts were modified to face aft, it was realised that by reducing the duct area a small amount of residual thrust was gained, because the exhaust was a by product of the powerplant supplying the thrust generator itself (the rotor) and had to be gotten rid of it is not considered as thrust compounding which is why it is the helicopter record not a rotorcraft one and why the claims for the X2 are spurious, that is a true compound.

The bonus of The thrust on G-LYNX was a happy accident

[email protected]

12th August 2019 14:42

Quote:

The bonus of The thrust on G-LYNX was a happy accident

so none of the clever people involved in the design and modification of the aircraft could have possibly thought through the consequences of changing the exhausts..........?

In modifying the jet pipes, did they have to make them convergent as well as facing backwards?

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