OTHER: Helicopter - Inside - Interleaving - Electrotor-SloMo

• An extremely light electric Interleaving helicopter.
• For Principal Assembly see. ELECTROTOR-SloMo
• For Frame see; DESIGN: Electrotor-SloMo ~ Frame - Interleaving - General
• For Tripod Assembly see. Electrotor-SloMo ~ Fuselage - Tripod
• For Frame & Skid Assembly see. Electrotor-SloMo ~ Fuselage - Seat & Skids
• OTHER: Helicopter - Inside - Pros & Cons - Interleaving vs. Intermeshing

• Tripod:

• Simple Seat and Skid:

Bill of Material

1. Larger effective disk area.
2. No rotor on rotor downwash.
3. Yaw control can be by opposed longitudinal cyclic (twisting of the frame, which connects the two rotors, about its lateral axis.
4. Greater angular tolerance for lack of miss-synchronization.
5. Roll can be assisted by mechanical linkage between rotor hubs and weight-shift that tilts the inner rotor in the direction of the roll.
6. Gimbal will be located at a higher elevation, in respect to the principal assemblies, and this is closer to the principal assemblies' and frame's centers of thrust, and mass etc. See; DESIGN: Electrotor-SloMo ~ Frame - Interleaving - General ~ Gimbal
7. More: OTHER: Helicopter - Inside - Pros & Cons Interleaving vs. Intermeshing

• Consider increasing the blade span slightly, at least to 6 ft, but leaving the gap as is.
• Seriously consider using the Side-by-Side's means of flight control. I.e. a trunnion at each rotorhead.
• The frame that connects the two rotors is aluminum. It weighs more than composite but it will act as a heat sink for the stators on the motors. The central portion of this connecting frame could be changed to composites in the future.
• The hanger for the pilot, batteries, controller and rear leg will be high in the cross-frame thereby improving the weight shifting capability. Without causing tuck.
• Portability: Have the Interleaving X-frame, the blades and the tripod legs of approximately the same length for transportation. This means that the blades are removable from the hub. At least one blade per rotor must be removed.
• Heatsink for controller: Have the rear tripod in aluminum so that it acts as a headsink and is in contact with ground (when on the ground.
• Have rotor fan draw heat up from core of the stator. This fan will do little but is will be working with; convection current due to increased temperature, the tip vortex from the blades of the other rotor, and the 'fountain effect' (at least within ground effect).
• Use the Hall effect or perhaps Absolute Encoders (for electrical synchronization).
• Precone: For Interleaving consider reducing the precone to 5º.
• Downwash:
• Place the controller(s) above the pilot's head or above his shoulders where they get the airflow from the rotors and reduce some of the downwash on the pilot.
• At 500 rpm and 60 mph forward speed the location of zero thrust at 270º azimuth is at 1'-8' R.
• Controller: Consider the Kelly KBS 72121 24-72V, 50A for the initial development. It is 1.7 lbs. and $199.00. It may control up to 4 hp. It requires Hall sensors.
• Interleaving: The interleaving frame is to be built to strongly resist bending but to allow some limited trist about the lateral axis, for yaw control.

• OTHER: Helicopter - Outside - Interleaving - Landgraf ~ H-4
• OTHER: Helicopter - Inside - Intermeshing - Electric Motor Located in Rotors
• OTHER: Helicopter - Inside - Intermeshing - Electrotor-MicroLite
• OTHER: Aerodynamics - Rotor Disk - Dual Configuration - Interleaving
• The AHS Journal report entitled Technical Note: Twin Rotor Hover Performance. There is a hard copy and it is stored in removable E drive as; Twin Rotor Hover Performance.pdf

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