background image

 

X

4

MR

250 

 

MexAir RC 

 

12 

 

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.  
Verify that your propeller will not interfere with the main frame standoffs.   
The arm length is designed to accept a 5 inch prop without interference.  
There should be no noted “slop” and the arms should feel firmly seated in 
position, yet should 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 possibly 

sheering the aluminum threaded rod. 
 

PROPER ANGLE AND ANGLE TEMPLATE 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

iii.

 

Repeat the above steps when realigning the arm(s) after a crash.  Inspect for 
damage to the arm or frame.  Always repair or replace broken structural 
parts prior to use. 

iv.

 

The positioning of the motor arms can be varied from 60 degrees to affect 
flight characteristics, including the location of the center of gravity (CG).   

 

Contact Us: 
MexAir R/C 

Ph:  315.532.6826 

Web:  

www.mexairrc.com

 

 

Mexico Air, Sea & Land Radio Control Hobbies, LLC 

329 Pople Ridge Road 

Mexico, New York 13114 

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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