B585

OTHER: ~ Rotor Concept - Intermeshing w/ Curved Dihedral

Overview:

For an intermeshing helicopter where;

The obliquity of the masts is much closer to the vertical than on previous intermeshing helicopters.

The rotor disks have large precones.

The blades have a large amount of anhedral.

The construction consists of absolutely rigid rotors.

Advantages for the Intermeshing Helicopter:

The upward curve of the blade tips will increase the vertical gap between the tip of one blade and the approximate 75% R of the other blade when the blade close on each other. This has nothing to do with the rotational synchronization of the two rotors, WHICH IS ESSENTIAL. However, it is an assistant to the extreme rigidity of the rotor blades and rotorhub to rotorhub x-conection in assuring the proper over/under relationship of the blades when the close, at the front of the craft.

It should contribute to the speed stability.

Sketch:

Notes:

The following is only of concern for rotors with 3 or more blades.

It appears that Schoeffman's rotor radius is 40.5". = 81" diameter = 6.75 ft diameter.

This is an area of 35.8 sq-in

An Intermeshing with the same rotors and a stagger between shafts of 24" results in a total disk area of 49 sq-ft, which is a 37% increase. This is a reduction of the disk loading by 73%

Not using centrifugal force therefore there is a minimal force attempting to flatten the blade

Rick

Just been spending a couple of hours on conceptualization meditation.

If you remember, back a few weeks ago I mentioned the possibility of putting a little ramp on the leading tip of the Intermeshing blades to physically assure that they would cross with the desired blade being on top.

He is an even better idea; I think. It might be a really good idea.

In addition to conventional taper and twist how about bending the final +/- 20% of blade span upward. This should achieve the desired physical crossing plus reduce tip vortex and add to speed stability.

.dxf file attached.

Your thoughts ???????

Concerns:

Related Page:

OTHER: Rotor Concept - Intermeshing Rotors w/ Curved Anhedral This idea may be wishful thinking.

DESIGN: UniCopter ~ Rotor - Disk - Anhedral along Blade Span

OTHER: Rotor Concept - Intermeshing w/ Precone/Decone

OTHER: Rotor Concept - One-Piece Hub and Spars

DESIGN: UniCopter ~ Rotor - Disk - Pre-cone

DESIGN: UniCopter ~ Rotor - Disk - Blade to Blade Clearance - 3-blade Rotors

Initially displayed: November 24, 2009 ~ Last Revised: November 24, 2009

The above utility invention is openly and publicly disclosed on the Internet to negate an entity from patenting it, to the exclusion of all others whom may wish to use it. ~ Reference patent law 35 U.S.C. 102 A person shall be entitled to a patent unless - (a) the invention was known ... by others in this country, ..., before the invention thereof by the applicant for patent.