NDAA kit specifications | Hardpoint Robotics Docs

A complete NDAA-compliant powertrain and airframe. Ships with motors, a 4-in-1 ESC, propellers, telemetry and optical-flow sensing, sized for a 500 g class payload with 2.8:1 thrust margin. Flight controller, companion computer, mission sensors and battery are chosen by the integrator.

#Capability summary

Capability	Provision
GPS-denied flight	ARK Flow optical flow + rangefinder; no GNSS dependency. Supports indoor, under-canopy, and contested-navigation work.
Payload capacity	1185 g above a 410 g reference compute and sensing payload, to a 4000 g MTOW.
Companion compute	Mounting provision for Jetson Orin / Raspberry Pi class boards.
Telemetry	RFD 900x-US long-range modem, air + ground pair included. 902–928 MHz ISM, FCC-compliant.
Autopilot compatibility	Standard Pixhawk interfaces: Cube Orange+, Pixhawk 6C/6X, and similar. ArduPilot and PX4 both supported.
Safety	ESC interface supports RC or autopilot-level motor interlock, allowing an independent kill-switch channel alongside autonomous control.
Logging	Autopilot dataflash logging; no additional hardware required.
Supply chain	NDAA-compliant throughout.

#What's in the kit

Item	Qty	Vendor
HPR Q500 NDAA Frame Kit	1	Hardpoint Robotics
Ewing EM3115 860 KV motor	4	Ewing Aerospace
ARK 4IN1 ESC	1	ARK Electronics
RFD 900x-US telemetry pair (air + ground)	1	RFDesign
ARK Flow (optical flow + rangefinder)	1	ARK Electronics
Master Airscrew MR 10x4.5 propeller	4	Master Airscrew
Misc (hardware, wiring, standoffs, straps)	—	—

#Powertrain

Spec	Value
Motor	Ewing EM3115 860 KV
Motor weight (each)	113 g
Motor rating	40.3 A / 1000 W continuous
Peak	67.4 A / 1665 W
Magnets	N35SH
Stator	31 × 15 mm, 12N14P
Propeller	Master Airscrew MR 10x4.5
Propeller weight (each)	12.8 g
Prop material	GFRC, US-made
Disk area (4)	0.203 m²
ESC	ARK 4IN1, 50 A continuous / 75 A burst per motor (NDAA, Blue UAS)
Ewing recommendation	6S / 65 A
Battery (not included)	6S 5000 mAh LiPo
Hover throttle	~28%
Thrust ceiling	~2.0 kg/rotor → 8.0 kg MTOW at 2:1
MTOW	4000 g
Power path	XT90 to 4-in-1 ESC
Peak bus at 2:1	~93 A

#Weight budget

Item	Weight
Frame (500 mm carbon)	920 g
Powertrain and avionics (motors, ESCs, props, radio, flow sensor)	630 g
Autopilot (Cube Orange+ class)	75 g
Base airframe subtotal	1625 g
Companion computer (Orin Nano class)	175 g
Stereo depth camera (ZED 2i class)	235 g
Mission payload	410 g
6S 5000 mAh LiPo	780 g
AUW, reference payload	2815 g

#Performance

#Base weight

Airframe and autopilot, no mission payload. Base airframe 1625 g: a complete flyable aircraft with autopilot, telemetry and optical-flow sensing. This is the configuration to tune and trim in first. Autopilot is integrator-supplied.

Battery	Pack wt	Usable Wh	AUW	Bus	Margin	Endurance
6S 5000 LiPo	780 g	89	2405 g	16 A	3.33:1	15.0 min
6S 6000 LiPo	880 g	107	2505 g	17 A	3.19:1	17.0 min
6S 8000 LiPo	1150 g	142	2775 g	20 A	2.88:1	19.2 min

#Reference payload

Companion computer and depth camera (410 g). The 6S 5000 is the recommended default: lowest AUW, best thrust margin, and least downwash for work near the ground or over loose objects. Step up a pack size where mission duration matters more than agility.

Battery	Pack wt	Usable Wh	AUW	Bus	Margin	Endurance
6S 5000 LiPo	780 g	89	2815 g	20 A	2.84:1	12.0 min
6S 6000 LiPo	880 g	107	2915 g	21 A	2.74:1	13.8 min
6S 8000 LiPo	1150 g	142	3185 g	24 A	2.51:1	16.0 min

#At MTOW (4000 g)

Payload headroom is measured above the reference payload configuration. MTOW is set by propeller structural limits, so it does not vary with battery. Flying near MTOW costs endurance sharply; step up a pack size when running heavy.

Battery	Payload headroom	AUW at MTOW	Bus at MTOW	Endurance
6S 5000 LiPo	1185 g	4000 g	34 A	7.1 min
6S 6000 LiPo	1065 g	4000 g	34 A	8.5 min
6S 8000 LiPo	795 g	4000 g	34 A	11.3 min