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MAMR 4" StretchX Racing Frame

MAMR 4" StretchX Racing Frame

MAMR 4" StretchX Racing Frame

This is our second frame and was designed around some of the latest hardware offerings in the industry.  Just like our first frame, it took several months to design in collaboration with designer Byron Ortiz to get just right.  After much testing we have come up with a lightweight, strong, and agile 4" racing frame.  A few design features include: replaceable arms, sandwich method of assembly which gives the frame more structural strength, carbon fiber top-plate or optional TPU canopy (available soon), battery strap slot in between middle and bottom plate, 30.5mm x 30.5mm and 20mm x 20mm FC mounting holes. To help reduce weight and for durability, we chose to use Titanium M3 button head bolts.

Replacement Parts

Optional 3D printed parts

If you have a 3D printer:

Optional Antenna Mount designed by Ryan "Shoeface FPV" Shoemaker


Optional Shark Fin designed by Travis "Kahoona" Grindal



Frame 180mm (diagonal measurement from motor center to motor center)

Width 145mm (outer edge to outer edge)

Length 169mm (outer edge to outer edge)

Height 40mm

Weight Assembled 62g (top plate, middle plate, 4mm arms, bottom plate, standoffs, M3 bolts and nuts)

- Motor mounting holes12mmX12mm

Parts Included in kit:

1 - 2mm carbon fiber top plate

1 - 3mm carbon fiber middle plate

1 - 2mm carbon fiber bottom plate

5 - 4mm carbon fiber arms 

4 - 5mmx25mm M3 knurled standoffs

4 - M3x10mm Titanium button head bolts (top plate bolts)

4 - M3x16mm Titanium button head bolts (outer arm bolts)

4 - M3x18mm Titanium button head bolts (bottom standoff bolts)

4 - M3 stainless black oxide nylon insert lock nuts (for outer arm bolts)


Flight Controller: CL Racing F4S
Motor: Brother Hobby Returner R4 1806/2850kv (coming soon)
Esc: Spedix IS30 4in1 2-4S 30A or Spedix IS20 4in1 2-4S 20A 
Props: 4" HQ DP 4x4.3x3 PC V1S
Battery: CNHL 4S 1500mAh or Tattu 4S 1550mAh
Camera: Runcam Micro Swift2 or Runcam Micro Sparrow
VTX: ImmersionRC TrampHV
Radio: FrSky Taranis Q X7 2.4GHz
Receiver: FrSky R-XSR 2.4GHz

There are only 3 items left in stock.