Another Question

[Starfire]

I'm trying to design a tip-jet system by porting the exhaust gas mix along the rotors.

Has anyone tried a rectilinear orifice for jets o/p? The idea is to have the jet o/p as a linear
opening and thus have a low profile to match the blade and reduce drag.

 

[kolibri282]

Like so: http://4.bp.blogspot.com/_rUHyHq68ak0/Sh03yFmsRnI/AAAAAAAAmzo/ts1WMizStjQ/s1600-h/xv9-3a.jpg?

(from here: http://nhungdoicanh.blogspot.de/2009/05/hughes-385-xv-9a-hot-cycle.html)

 

[cburg]

You’ve probably seen this already:

http://tipjetusa.com/

First Hydrogen Helo

 

[kolibri282]

or this: http://www.peroxidepropulsion.com/article/35

 

[Starfire]

Like so: http://4.bp.blogspot.com/_rUHyHq68ak0/Sh03yFmsRnI/AAAAAAAAmzo/ts1WMizStjQ/s1600-h/xv9-3a.jpg?

(from here: http://nhungdoicanh.blogspot.de/2009/05/hughes-385-xv-9a-hot-cycle.html)

very near, but not what I had in mind - more like a slot along the plane of the blade rather than in the vertical.

 

[cburg]

In 1970 Compcop had several kits (probably none were ligit). One was the Compcop G-1 with three/four lawn mower engines (now the Vortech G-1). I purchased this kit and started to build it as a freshman in high school. Never finished it (they don’t fly anyway as far as I know).

http://www.vortechonline.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=V1&Product_Code=XP2040H

Compcop also had a cool backpack helo. It was a single blade with a round counterweight and a compressed air tip like you described. I could not find an old photo.

Here’s onother with a jet tip:

Sud-Ouest Djinn

http://en.wikipedia.org/wiki/Sud-Ouest_Djinn

 

[kolibri282]

Good ideas in rotary wing aircraft are a dime a dozen.
Good, excellent, even marvelous engineering is required to make them work.
Good luck!