Jet hovering ?

On Wed, 1 Oct 2008 10:49:51 -0700 (PDT), snipped-for-privacy@gmail.com wrote in :

Harrier jets use thrust vectoring and hover all the time (horizontally, not vertically).

If you had enough nozzles, I imagine you could get a jet to hover vertically.

All it would take is time and money. Lots and lots of money!

Marty

ok.. but still.. look at this video, and try to explain... ;-)

I would think the explanation has to do with using the center of gravity to the advantage of the pilot. In short, its probably a function of how well you can balance the plane ........ similar to the way you can put a broom stick on your fingertip and balance it vertically. Of course, I could be totally full of horse pucky, too. Its an interesting question. thanks for starting the discussion.

Harlan

Thrust vectoring, try a Google search on model jet thrust vectoring.

Thanks everyone, very instructive...

Well shut my mouth! I was just saying today how RC jets can't do that! I'm going to have to find that fellow and tell him differently. That was awesome. mk

Thrust Vectoring??

Yup.

Seen it done with electric pusher jets.

"Frank" wrote

Gotta be. That is one fine jet driver, too.

Really, you could see that before he started the tumble maneuvers and the hovering. The smoothness of the flight was very good, rock solid, and looked very scale-like.

Jawdropping..

I venture a guess that the 30Krpm turbine gives some gyroscopic support?

Well it's appear after a lot of google search that the thrust vestoring IS the solution, but anyway, the delay problem still remain, he (the pilot) still have to think at least a few seconds in advance and have to really know is airplane...

I'm currently working on a jet being able of doing this (with thrust vect.)... but it's gonna take LONG time before I will be able to do this... ;-)

Guys, if you have anything about thrust vectoring for turbine, please let me know.

Thanks,

Robin

I think there is an axiom among full-scale pilots that you should never get your plane to a place where your brain hasn't already been.

I'm SURE that some of the veteran members of the group can give us the precise quote.

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Come on guys, all he would need is thrust vectoring vanes and a couple of solid-state gyros preprogrammed. He would then maneuver the plane as close as he could manually and then flip the switch. Voila! (wah-lah)

Ed Cregger

One of the local guys has a ducted fan F16 with X Y panels in the exhaust duct for thrust vectoring. What he does with it is staggering......

There is a lot more air flow over those tail feathers then you might think exists in a hover. After all, the exhaust from the jets is really moving fast. So it is at quite a low pressure. Surrounding air will flow into the low pressure exhaust stream like mad. That air has to come from someplace and a bunch of it flows right by the tail feathers to get there. So those tail feathers can still provide a bunch of lift. Add in a couple of gyros and it does not seem at all that unreasonable to me. Not easy but he also did not hover long either. I am surprised he could not hover longer. He is obviously a bloody good pilot.

What do you mean by "X Y Panel" ??

On Thu, 2 Oct 2008 16:27:11 -0700 (PDT), snipped-for-privacy@gmail.com wrote in :

Wild guess: two planes. Horizontal and vertical.

X: horizontal vanes.

Y: vertical vanes.

Marty