Nemesis

	Nemesis
	In Greek mythology, Nemesis is the goddess of divine justice and vengeance. Her anger is directed toward human transgression of the natural, right order of things. The natural, right order of things such as 'Bilateral Symmetry'.

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Overview:

This is an Interleaving-ABC configuration that is a variant of the UniCopter Intermeshing-ABC configuration, but with a lower effective disk-loading. It is a preliminary concept, presented as a foundation for further consideration and development.

It is an Interleaving configuration, but with a reduced stagger due to the dihedral of the rotor disks. The blade-tips are able to pass underneath the blade-roots of the other rotor with minimal clearance due to the 'Absolutely' Rigid Rotors (ARR).

The Interleaving configuration may well become the optimal large rotorcraft configuration, once active blade twist has been achieved. In theory, it should outperform the Tilt-Rotor configuration in all respects, with the exception of maximum forward speed.

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If the Independent Root & Tip: (IRAT) and the Reverse Velocity Utilization: (RVU) prove to be viable, this configuration might eventually outperform the Tilt- Rotor in all respects. This includes maximum forward speed due to its ability to have propulsors, which are capable of fast forward speeds then are the prop-rotors.

Drawing:

Features:

Better rotor thrust distribution about the area of the total disk, due to the inclusion of; Advancing Blade Concept, Active Blade Twist, higher frequency pitch control and Reverse Velocity Utilization.

High lift due to the minimal downwash on the fuselage, resulting from the four features mentioned on the above line.

Good stability; due to the dihedral and the Advancing Blade Concept.

Responsive controllability; due to the Absolutely Rigid Rotors.

High forward speeds; due to the Large Chord and Low Tip Speed, plus Pusher Propeller(s) that are optimized for forward flight only. Turbofans will replace the pusher propellers if the Reverse Pitch Rotor Concept is viable.

Reduced Vibration; due to the four-blade rotors, which should eliminate the three-blade vibration resulting from lateral dissymmetry of lift at high forward speeds.

Canard Option: OTHER: Helicopter - Inside - Interleaving - with Canard

Advantages over the Tiltrotor; Pros & Cons vs. Tilt-rotor

Advantages over the Coaxial; Pros & Cons vs. ABC Coaxial

Advantages over the Tandem; Pros & Cons vs. Tandem

Advantages over the Intermeshing; Pros & Cons vs. Intermeshing

~ All material is rough and constantly under revision. ~

Primary Grouping:

Nemesis Overview

Concerns & Tasks

DESIGN, MAKE & BUY:

Much of the material in the following sections is common to the UniCopter and to the Nemesis.

The objective of this Nemesis web page is that of developing the details of an Interleaving rotorcraft; perhaps to the specifications of the NASA Heavy Lift Rotorcraft or to the specifications of Prouty's example helicopter.

Control - Flight *	Control - Power Train	Weight & Balance
Rotor	Power Train	Dimension, Area & Drag
Fuselage	Pusher Prop	Trim, Stability & Control:
Landing Gear	Engine
Instrument	Exhaust	Vibration
Electrical	Fuel	Special Tool

OTHER:

Aerodynamics	Intermeshing Information	Miscellaneous
Flight Dynamics	Helicopters - Outside	Regulations
Mechanics	Helicopters - Inside	Composites
Electrics	Rotor Concepts:	CNC Workstation

Initially displayed: March 25, 2005 ~ Posted on PPRuNe; March 26, 2005; on rec.aviation.rotorcraft; August 4, 2005 ~ Latest revision; April 16, 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.