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X

4

MR

250 

 

MexAir RC 

 

 

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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 

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Fine adjustments to center of gravity 

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variable motor placement to enhance maneuverability 

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motor arm “swing away” deflection on a hard-hit thus reducing crash damage potential 

 
The

 X

4

MR

 250 kit includes all the frame components and fasteners necessary to construct a 250 class 

racing quad using electronics of your choice.  You will receive the airframe in an already assembled state.  
We have done this for you so that you can see how the frame should look when completely assembled.  
It is expected that you will disassemble some of it during the build.  The instructions that follow assume 
that you simply received the kit in a completely disassembled state.   
 
The airframe comes configured to mount the supplied Power Distribution Board with the included PDB 
standoffs and predrilled main frame mounting holes.  This PDB mount allows for “piggy-back” mounting 
of a 30.5mm controller board using additional standoffs.   The frame body already has embedded wire 
leads to solder the included LEDs to both the front and rear to assist in visual orientation during flight.  
The motor arms have internal wire cavities that allow for embedding the motor wires up to the main 
frame and the speed control bottom plate.   

 

X

4

MR

 Kit Contents: (See Accompanying Pictures)  

1.

 

Main Frame Body w/preinstalled LED wiring  

2.

 

Motor Arms (4) 

3.

 

Top Plate [To mount FPV Gear]  

4.

 

Bottom Plate [To mount ESCs]  

5.

 

Camera Plate [To mount forward looking camera]  

6.

 

Landing Gear Legs, Boots, and Mounting Hardware (4 sets) 

7.

 

Power Distribution Board [3oz copper PDB for higher  
current applications]  

8.

 

LED Boards, 4S LiPo Capable  (Front & Rear) 

9.

 

PDB Mounting Standoff Set 

10.

 

Plate Mounting Standoffs/Hardware Set 

11.

 

“Hook & Loop” Battery Strapping Material 

12.

 

Alternate 3mm motor mounting screws (16) if your motor screws will not fit properly 

13.

 

Double Backed Insulating Tape 

 
 
 

 

 

 

Summary of Contents for X4MR 250

Page 1: ...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...

Page 2: ...me comes configured to mount the supplied Power Distribution Board with the included PDB standoffs and predrilled main frame mounting holes This PDB mount allows for piggy back mounting of a 30 5mm co...

Page 3: ...o metal screw contact surfaces especially motor mounting screws 4 Dry fit and test all electronics and FPV gear to the extent possible during the build so disassembly will not be required after you ha...

Page 4: ...ary to start tightening it back it out slightly repeating this process until the fastener is threaded to the proper depth This creates a threaded hole that should hold firmly without any other aid For...

Page 5: ...both the positive and negative wire ends at the main body hole the large elongated hole You can always trace the polarity later during the build if you forget to do it now If supplied with colored wir...

Page 6: ...ile holding the standoff in place Take care not to over tighten the standoff and shear off the screw For added assurance to prevent the screw from ever backing off a small dab of RTV Silicone Seal can...

Page 7: ...s Verify that there will be sufficient wire to reach your intended ESC solder pad locations or connector A minimum wire length of about 4 inches is necessary If not use the Surface Wire Option describ...

Page 8: ...o the arm using small tie wraps ii If using this option you may also consider surface mounting your motor ESCs directly on the arm surface Again this will additionally increase drag and turbulence and...

Page 9: ...r This will allow for soldering the motor wires later and THEN moving the heat shrink over the ESCs prior to final shrinking d TEMPORARILY place the ESCs onto the bottom plate so that the motor pads f...

Page 10: ...ole is clear of any obstruction When finally tightened this creates a very rigid frame Temporary and partial frame assembly may be desired as you progress through assembly CF Tube Standoff Configurati...

Page 11: ...piece If there is any noted slipping or twist verify that all standoff fasteners are properly tensioned f Landing Gear Installation Note Nylon landing gear can be cut to desired length i Embedded Mot...

Page 12: ...pivot with moderate force Tighten loosen the arms as necessary so that they are firmly seated but can pivot with moderate force Do not over tighten to cause excessive dimpling of the laminate or poss...

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