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MexAir RC X4MR 250 Manual

Fpv race quadcopter

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X
MR
250
4
(See our website
www.mexairrc.com
Introduction
Congratulations on your purchase of the MexAir RC
some very unique design features that allow for advanced flight characteristics. The built-in
configurations enhance maneuverability, speed and load handling capability. Some of these are
described below and throughout the build sections of this manual. Besides the advantages described
below are the less obvious materials making up the airframe. Most quality multirotors use some form of
carbon fiber in their design. We have chosen the more costly but highest quality aerospace quasi-
isotropic carbon fiber. Rather than describe the benefits of this material, especially when used in
conjunction with a light-weight core, you may wish to simply "Google" the terms to find the vast amount
of technical data supporting the use of this grade of carbon fiber in light-weight rugged, rigid, and strong
applications.
MexAir RC, located in Central New York, is the designer and manufacturer of the
Racing Quad airframe. We specialize in the design and construction of the airframe. Since the various
electronic components and peripherals are widely available through many sources, our focus is on
providing a unique platform for the already available devices. The experienced builder will already know
much of the information – but we decided to cover details not always found in build manuals –
especially considering some of the unique features of the
X
MR
The
carbon fiber laminated airframe design, materials, and methods of construction create an
4
assembly that allows for:
Enhanced aerodynamics due to the ability to embed wiring within airframe structural
components thus reducing turbulence and drag
Elimination of the typical "lightening holes" in areas of the airframe to improve strength and
rigidity, additionally reduce turbulence, while at the same time reducing airframe weight when
compared to typical solid carbon fiber frame materials used in many other multirotor copters
Reduced induced vibration through use of vibration damping body & arm core material –
resulting in better video quality
Electronic component placement flexibility due to:
o ease of mounting additional accessory items to the CF frame using simple self tapping
screws
X
MR
Manual
4
for our upcoming video series on
X
MR
250 FPV Race Quadcopter. This quad has
4
X
MR
4
X
MR Airframe
Completed
4
Total Weight as
Pictured: 111 Grams
1
X
MR
Construction))
4
X
MR
4
.
MexAir RC
250 Class

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Summary of Contents for MexAir RC X4MR 250

  • Page 1 MexAir RC, located in Central New York, is the designer and manufacturer of the 250 Class Racing Quad airframe. We specialize in the design and construction of the airframe. Since the various electronic components and peripherals are widely available through many sources, our focus is on providing a unique platform for the already available devices.
  • Page 2 MexAir RC o additional space on certain surfaces of the frame when using embedded wiring Top and bottom plate mounting using thru-layer tie-rods and fasteners creating a rigid structure required by high power motor systems Variable motor arm positioning that allows for...
  • Page 3 MexAir RC Other “stuff” typically installed on a racing multirotor frame includes: Flight Controller Board Motors Propellers Speed Controls (ESCs) FPV Gear and cameras Batteries and Battery Connectors In some frame designs, including the , there are varying options for positioning and mounting components.
  • Page 4 MexAir RC b. Always wear appropriate safely gear or take other precautions during any operation that could create a hazardous condition – including soldering, drilling, cutting and grinding. Carbon fiber is a conductive material. Never allow bare battery terminals or other powered connections to physically come into contact with the carbon fiber or metal components of the frame.
  • Page 5 MexAir RC Construction of the Airframe 1. LEDs (LED Boards supplied with this kit can be run direct to 4S LiPo power without any voltage regulator) a. The preinstalled LED power leads feed through the body of the frame and exit the frame conveniently below the PDB position.
  • Page 6 MexAir RC 2. There are two possible locations to mount the PDB and/or controller board. Note that there are six standoff hole locations. Use either the forward or rear sets depending on your needs. The rearward set places the controller more toward the center of the body – closer to the center-of-gravity.
  • Page 7 MexAir RC c. When initially dry-fitting the motor in the following sections and on final tightening of the motors, verify that the motor shaft is centered in the arm shaft hole and that there is sufficient clearance from any shaft hardware. Some motor shafts have a clip or setscrew that secures the shaft in the motor.
  • Page 8 MexAir RC from the outside with a thin/blunt pointed object. Do not cut off any excess motor lead at this time. Enough Wire Laid Out with Some Excess 3 Motor Wires Through Motor Wires in Place v. Bolt your motors to the arms while carefully pulling from the body end any excess wire loop at the motor.
  • Page 9 MexAir RC mm. This allows ample space for ESC mounting. If not already done, dry-fit the arms and bottom plate to the main frame should there be any doubt. 14mm 9.7mm View of Spacing Between Bottom of Body and ESC Mounting Plate b.
  • Page 10 MexAir RC 5. Frame Assembly a. Assemble the balance of the frame as you complete the final wiring of your electronics. See the accompanying photos for airframe standoff placements. Note that the upper standoff CF tubes are embedded into the main frame. They insert into the upper side of the main frame body and rest on the lower skin surface.
  • Page 11 MexAir RC c. With the motor arms held loosely in place, thread the aluminum cone nuts onto their respective threaded rod (rear arm) and 4-40 SS screw (front arms). The cone nut should be threaded on so it will leave sufficient thread for spacers and engagement with the knurled nuts.
  • Page 12 MexAir RC g. Final Adjustment of Motor Arm Position & Tension i. The motor arms are designed to intentionally pivot at the single mounting point. ii. The motor arm is typically mounted at about 60 degrees from the main frame (see picture below). This is a good starting point for most applications.