Jet Tip

[gyro-3xio]

Okay,
Not sure if this was ever covered before.
But this looks,... um,.... simplier... has a factory look to it.

http://www.youtube.com/watch?v=LEDo9...eature=related

Can the experts comment?

Jim.

[freebird]

I am not an expert, but I know that historically most tip jets use a hydrogen peroxide that reacts with sacrificial metals in the tip to produce thrust.

The nazis experimented with this method rather successfully, but after the first test pilots were involved in crashes that involved a rupture of the fuel tank and consequently the poor fellows being melted by the peroxide (it attacks organic matter visciously). Future test flights often involved the next pilot being sent out for the next test flight at gunpoint.

The tip jet system is very nice because it solves so many torque and control problems.

Maybe this machine has some new tricks.

[Skyjinks]

Originally Posted by freebird

I am not an expert, but I know that historically most tip jets use a hydrogen peroxide that reacts with sacrificial metals in the tip to produce thrust.

The nazis experimented with this method rather successfully, but after the first test pilots were involved in crashes that involved a rupture of the fuel tank and consequently the poor fellows being melted by the peroxide (it attacks organic matter visciously). Future test flights often involved the next pilot being sent out for the next test flight at gunpoint.

The tip jet system is very nice because it solves so many torque and control problems.

Maybe this machine has some new tricks.

Wow, melted by the peroxide! Now just what sort of peroxide is that?!! I guess there are many reasons that tip thrusters have been deemed impractical but being melted by peroxide!! As someone who is responsible for production of such a substance and the people who handle it I'm not exactly enamoured with this statement - Poetic licence I think?

[brett s]

And you felt the need to post the exact same thing 4 times in different threads?

Smells like spam to me...

[PW_Plack]

Poetic licence I think?

If it were true, half the world's blondes would have melted!

A catalyst is also not a "sacrificial metal."

[Trez]

At the beginning of this video http://www.youtube.com/watch?v=uKBJ1doXcnE the pilot is seen 'pumping' something.
At first I thought it was some kind of pre-rotator but then I saw in a different video (same bird and pilot) http://www.youtube.com/watch?v=uKBJ1doXcnE at 20 seconds into the video, he was pumping after the rotors were already spun up. (And why would a pre-rotator be necessary on rotors with tip-jets)?
Interesting............
Trez
*****************

[karlbamforth]

Not sure but possibly priming the "fuel" system, once the rotors are turning at speed then a pumping action will syphon fuel from the tanks to the blade tips.

I think that most historical tip jets used hot (jets/rockets/ramjets/air) or cold air thrust, not many used peroxide.