Hacker HotWing 750 Flying Wing

Hacker HotWing 750 with additional red and yellow paint

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Current Power Setup

  • Motor: AEORC ADH300S 2400Kv, 100W, 15A max, 3mm shaft, 21g (not shown)
  • ESC: HobbyKing 12A BlueSeries (not shown)
  • Prop: 5045 DAL Prop Bullnose V2 Red on aluminum prop saver
  • Batteries: Glacier 3S 1000mAh 30C, 97g
  • Amp Draw: 10A static

Previous Power Setup

  • Motor: HURC 250 2300Kv, 70W, 17g, 9A (2S Specs), 24G with prop saver, motormount, wires and bullet connectors (black motor shown in photos)
  • ESC: Turnigy Plush 10A
  • Prop: GWS 5043 EP (newer style with 4mm hub)
  • Amp Draw: 10.5A static (6030EP 13.1A, 6050SF 15A)

Current Radio Gear

  • Transmitter: Spektrum DX18 G1
  • Receiver: Spektrum AR400
  • Servos: Hextronik HXT500

Current Specs

  • Wingspan: 29.5″ or 750mm
  • AUW: 9.75oz or 280g (wing 6.375oz or 183g)
  • CG: 140-142mm or 5.5-5.6″ from nose
  • Flight Time: 8 minutes

Manuals, Specs and Instructions

ADH300S Prop Data
AEORC ADH300S 2400Kv Motor Prop Data

Power System Update
After an accidental touch-n-go on concrete (see video below), I swapped out the motor, ESC and prop to something a tad bit more powerful. The HotWing 750 flew good with the HURC motor but the GWS prop did cavitate slightly. So I went from a 70W motor to 100W with a 12A ESC and a stronger quadcopter style prop to reduce cavitation.

Light Build
I tried to build my Hacker HotWing 750 fairly light. With my chosen electronics, I knew it was going to be on the tail heavy side so I looked for areas to reduce weight, particularly aft of CG. The plywood motormount was a good place to save weight because it’s a little overkill for this wing. I added 5mm Depron fillers between the motormount braces, top and bottom, to help with aerodynamics. I installed only one of the included carbon-fiber spars the length of the wing. Hacker wings are thick and fairly stiff.

Drilled motormount braces and 5mm Depron fillers
Drilled motormount braces and 5mm Depron fillers

Electronics Layout
The Spektrum AR400 receiver that I used in my HotWing 750 build is light, even with the plastic case. It fit well on its side so the connectors and wires don’t protrude from the bottom of the wing. Against my better judgment, I went with Hextronik HXT500 servos to save weight but I’m not sure how they’ll hold up. The Turnigy Plush 10A ESC is bare minimum as far as amp draw and holding up well so far. Glacier 3S 1000mAh 30C batteries give 7-minute flight times easily with no noticeable voltage sag. I used EC3 connectors because I had them on the Glacier batteries already.

Spektrum AR400 Rx, Turnigy Plush 10A ESC and wiring
Spektrum AR400 Rx, Turnigy Plush 10A ESC and wiring

Layout and Build, Bottom
I cut the top of the wing fences down and used some of the extra pieces on the bottom for ribs in front of the servo horns and rods. Most of the wing fences were aft of CG so it helped reduce weight. I cut a recess for the Glacier 3S 1000mAh battery. I was going to use Velcro on the battery but instead used a Velcro battery strap that goes through slots and over reinforcement on the top side of the wing. I used a similar setup on another flying wing and it works well.

Electronics layout and additional ribs in front of servo horns
Electronics layout and additional ribs in front of servo horns

External (Long) Receiver Antenna
The Spektrum AR400 receiver has two antennas, one right at the case and one on the end of a cable. The antenna on the end of the the cable is known as the external antenna or feeder antenna. I routed the short antenna right into the foam from the receiver recess and the feeder antenna goes through the wing to the top side and embedded along graphics lines. (Photo before paint)

External (long) receiver antenna embedded on top of wing
External (long) receiver antenna embedded on top of wing

Nose Reinforcement
Knowing my HotWing 750 build would be on the tail heavy side, I didn’t need to scimp much on reinforcing the nose for the battery. The carbon-fiber rod that I didn’t use as a wing spar was embedded into the nose. The thick red plastic pieces used for battery strap reinforcement came from Ritz Crackers & Cheese Dip snacks, ha! I used a pencil torch to heat and bend the plastic to the shape of the airfoil. I often save little things like this that might work well in a build or mod. Liquid pump hand soap bottles have thicker plastic tubing that works great for reinforcing antennas.

Carbon-fiber rods and battery strap reinforcement on top
Carbon-fiber rods and battery strap reinforcement on top

The blue arrow above points to a little red dot which is where I had a cut down round-headed (sewing) pin pushed into the foam during my build so I could constantly check CG during my build. Factory recommended CG is 140mm from nose.

Drilled-out motormount braces and 5mm Depron filler on top
Drilled-out motormount braces and 5mm Depron filler on top
CF reinforcement, battery strap supports and cutdown fences
CF reinforcement, battery strap supports and cutdown fences

Updated Paint for Better Orientation
I put a few more batteries through my HotWing 750 and came to the conclusion that I need to be able to see it better at a distance. My eyes are just not what they used to be! So I painted larger red and yellow graphics on top and the typical black stripes on the bottom for better orientation at a distance. My paint of choice for EPP is Krylon Short Cuts.

Hacker HotWing 750 with additional red and yellow paint
Hacker HotWing 750 with additional red and yellow paint
Hacker HotWing 750 with black invasion stripes on bottom
Hacker HotWing 750 with black invasion stripes on bottom

Overview
The Hacker HotWing 750 is a great flying EPP wing! With my light build, she will fly fast or slow, soar on thermals, do large or tight horizontal and vertical loops, aileron rolls as fast or slow as you want, and inverted flight has no ill tendencies.

Hacker HotWing 750 Videos

Close-ups, Feedback and Reviews
To be more mobile friendly, photos on TazRC are limited in size. I would be happy to post any close-up photos on request. Just leave a comment below. Also, feel free to leave your feedback or personal review on the Hacker HotWing 750. Registration not required.

Shortcut URL to this page: https://tazrc.com/hw750

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