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REV 2.4 - Mon Aug 16 11:35:45 2010

Art Applewhite
Hornet Monocopter (18mm)
P.O.Box 294064
Kerrville, TX 78028
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SPECS: 6" x " - 0.8 oz
ROCKSIM FILE: MISSING - please submit here
SpaceCAD FILE: MISSING - please submit here
REC'D MOTORS: A8-3, B4-2, B4-4, B6-0, B6-2, B6-4, C6-0, C6-3

(Contributed - by Bob Cox [Who's Who Page] - 05/26/08) Art Applewhite Hornet

The Hornet is the second 18mm monocopter released by Art Applewhite [Who's Who Page]. Similar to his 18mm Dragonfly but with a shorter wing, the Hornet claims to have a more aggressive flight profile.

Parts list:

  • Wing--2"x6"x1/8" basswood plank
  • Balance Beam--8"x1/4" dowel
  • Support Dowel--2.75"x3/16" dowels (qty 2)
  • Center, Center Support, and Motor Support- 2"x3.25"x1/8" basswood
  • Motor Mount Tube--2" BT20 tubing
  • Motor Reinforcement--fiberglass tape
Art Applewhite Hornet The kit came in a heat-sealed plastic bag. The USPS Express Mail cardboard box that it was shipped in was partially crushed and had dirt and grass stains on it, but the contents were unharmed.

The instructions are remarkably concise for a model of this complexity. The assembly instructions fit on two 8.5"x11" laser-printed pages with a third page describing flight preparation. The illustrations clearly show the key dimensions and alignment at each critical step. Although it is not mentioned in the text, the illustrations on the first page are full size. This allows them to be used as templates for cutting and aligning the pieces.

Art Applewhite HornetArt Applewhite Hornet

Art Applewhite Hornet

The build process takes 11 steps including finishing. Elmer's Glue All is used throughout. I asked Art about using Carpenters Glue instead. He recommended against it because carpenter's glue shrinks a lot and gets brittle, an undesirable trait during hard landings.

First the center plate, center support, and motor support are cut from the short piece of basswood plank. The center pieces are glued to each other with their grains perpendicular for strength. Then the support dowels are glued to the center supports, followed by the balance beam dowel.

The support dowels serve multiple purposes on a monocopter. In addition to holding the motor mount and the wing to the center section, their thickness and spacing help set the angles for the motor and the wing.

The wing is glued to the center section at an angle, with one edge under a support dowel and the other edge over the other dowel. I cheated a little.

The motor mount tube is glued to the motor support. After the glue has dried, the tube and support are both wrapped with fiberglass tape and the tape is coated with glue. When I built mine, the glue joint between the tube and the support must not have been completely dry. When I coated the glass tape with glue, the support came loose from the tube and slid around. That is why I recommend jumping out of sequence and gluing the support to the motor tube much earlier in the process so that it has a chance to dry before applying the fiberglass tape.

After the glue has dried on the fiberglass, the motor assembly is attached to the center section. One edge goes under a support dowel and the other edge goes over. When done properly, the wing will tilt one direction and the motor will tilt in the opposite direction. The illustrations clearly show the correct orientation of all the parts.

Finally, a ¼" launch guide hole is drilled in the center section (but not in the center of the center--it is offset a little bit). This is another step that would be easier if it were done earlier, before the angled wing and motor assembly were attached.

There is no mention of sanding any of the parts in the instructions. I wasn't sure if rounding or airfoiling the edges would affect the flight characteristics, but Art assured me that doing so would make little difference. I sanded the flat wing surfaces smooth and rounded the sharp edges.

The kit comes with no decals and color choices are left to the creativity of the builder. The instructions say to apply two coats of clear enamel to protect the wood and glue from moisture and dirt. I wanted something more colorful so I asked Art if paint or Monokote would work without screwing up the balance. He said they would be fine as long is I didn't get carried away.

In keeping with the Hornet name, I decided to paint mine yellow and black. I skipped my usual multiple steps of priming and sanding and went directly to the final colors to save weight and time. After masking off all the surfaces that would need to be glued, I painted the wing with Rustoleum Sunset Yellow. The rest of the body was painted with Rustoleum Gloss Black. After drying overnight I used low-tack masking tape and Gloss Black paint to put black stripes on the wing.

Construction Rating: 4 ½ out of 5

The Hornet was designed to fly on any 18mm black-powder motor with a short or medium delay (A8-3, B4-2, B4-4, B6-0, B6-2, B6-4, C6-0, C6-3). Long delays should be avoided because the ejection charge will not fire until the rocket has reached the ground, thus creating a fire hazard.

Flight preparation is very simple:

  1. Wrap a 3/8" wide strip of masking tape around nozzle end of motor.
  2. Insert motor into motor tube.
  3. Insert igniter.
  4. Connect igniter leads, making sure that they won't get snagged when the copter is spinning on the pad.
Speaking of pads, the recommended launch rod is a half-inch long #¼-20 bolt. Longer or thinner rods are not recommended. Art includes plans for making a simple pad using 2"x4" lumber, a bolt and nut, and a few wood screws. My launch pad already has a #¼-20 threaded rod that holds a drill chuck. I merely unscrewed the chuck and put a nut on the threaded rod to keep the rocket from sliding down too far. No blast deflector is needed.

For the maiden flight, I used a B4-2. At ignition, the copter quickly spun up with a rising buzzing sound and flew straight up leaving a tight corkscrew smoke pattern. Despite the 15-20mph wind, the copter did not weathercock at all but merely slid sideways downwind as it was flying. After burnout, it fluttered down to a soft landing. Despite landing on very hard ground, the Hornet suffered no damage.

The second flight flew on a C6-3. This is a great motor for this kit. The spin-up and takeoff were again vertical with a slide-side downwind. The higher thrust and longer duration of the C6 vs the B4 led to a higher-pitched buzz and a higher altitude at burn-out. Again it fluttered to a soft land on hard ground.

Art Applewhite HornetArt Applewhite Hornet

Inspection after the second flight revealed a hole burned through the motor casing and the motor mount tube on the edge opposite the blade. Apparently this is a common issue with monocopters because the centrifugal force causes the hot fuel particles to collect on the outside edge above the nozzle. The damage to the tube is not so bad that it won't be able to fly again, but I wonder how many flights it can tolerate. If the burn-through always happens in the same location then the damage to the motor mount tube may not get any worse.

Flight Rating: 4 ½ out of 5


  • Unusual design--definitely not three fins and a nose cone.
  • Interesting flight profile--not another "whoosh-pop" up-and-down flight.
  • Clear directions.
  • Flies well even in windy weather, and short walks for recovery.


    • Motor burn through side of casing and motor mount tube.

    Starting with the Dragonfly and continuing with the Hornet, Bumblebee, and Whirlwind, Art Applewhite has taken the mystery out of monocopters and made them accessible to the masses. For years Art has had a reputation as the "saucer king." If the rest of his monocopter kits are as good as the Hornet, he may soon be able to claim the title of "monocopter monarch" as well.

    Overall Rating: 4 ½ out of 5

[Submit your Opinion]

07/08 - "Follow-up: After seven flights, every C6-3 has burned through its casing. The burn-through is always in the same spot, so the hole in the motor tube is not getting any worse. The Hornet has proven to be a great flyer in any kind of weather - wind, rain, or calm." (B.C.)

[Enter Rocket Specific Tip]

"" (x.x.)

[Enter Flight Log]
Date Name Motor Ejection/
Wind Notes
07-03-2008 Donald Besaw Qst SU C6-0 None - Tumble Calm - Great flight, my first Monocopter launch. After recovery I noticed a small burn through in the MMT but this seems to be a well known issue with these. Nothing major.
05-24-2008 Bob Cox Est SU B4-2 None - Tumble 10+ mph winds Event: Maple Island
- Rapidly spun up to speed then lifted straight up with a tight corkscrew smoke trail. Reached about 50 feet at burnout, then fluttered gently down about 100 feet downwind. No damage despite landing on hard ground. NICE!
05-24-2008 Bob Cox Est SU C6-3 None - Tumble 10+ mph winds Event: Maple Island
- Took off straight up, spinning faster as it flew. No arc into wind -- just slid sideways downwind. Soft landing about 250 feet downwind. GREAT flight. Motor burned through side of casing and through motor mount tube. Still flyable, but for how long?
06-19-2008 Bob Cox Est SU C6-3 Apogee - Perfect Calm Event: Schmidt Park
- Rapid buzzing takeoff, followed by whistling during coast. Ejection charge popped right at apogee. Quickly stopped spinning, then fell motor-first to the ground. Motor burned through casing but did not cause any additional burning of hole in motor mount.
06-19-2008 Bob Cox Est SU C6-3 Just Past (1-2sec) Calm Event: Schmidt Park
- Fast buzzing takeoff followed by whistling coast. Ejection charge fired just after copter had started to settle back downward. Tumbled to soft landing on grass. Motor burned through casing but did not cause any additional burning of hole in motor mount.
07-04-2008 Bob Cox Est SU C6-3 None - Tumble 0-5 mph winds Event: Rodeo Grounds
- Rapid buzzing takeoff followed by whistling coast. Ejection just past apogee. Tumbled to ground motor-first. Motor burned through side of casing again, but no additional damage to tube. 10 sec.
07-04-2008 Bob Cox Est SU B6-2 Apogee - NC Down 0-5 mph winds Event: Rodeo Grounds
- Short boost with buzzing and whistling. Ejection charged fired just past apogee while still spinning, making a nice smoke ring. Tumbled safely to the ground. 6 sec.
07-19-2008 Bob Cox Est SU C6-3 None - Tumble 0-5 mph winds Event: Christ Community Church
- Launched in light drizzle. Against the dark cloudy background, the smoke trail was invisible but the flames looked like a glowing ring of fire! Tumbled to safe landing on grass. Spectators loved it.
08-31-2008 Bob Cox Est SU C6-3 None - Tumble 10+ mph winds Event: Rodeo
- Rapid buzzing takeoff, whistling coast. Slowed to stop during descent, then actually starting spinning again shortly before landing. As usual, motor casing burned through side. 10 sec
09-21-2008 Bob Cox Est SU C6-3 None - Tumble 5-10 mph winds Event: Schmidt
- Typical Hornet flight. Soft landing on grass.
09-27-2008 Bob Cox Est SU C6-3 None - Tumble 10+ mph winds Event: Maple Island
- A repeat of every previous C6-3 flight. Nice.
05-24-2009 Bob Cox Est SU C6-3 None - Tumble 5-10 mph winds Event: NSL2009
- Typical flight, including casing burn-through. 6 sec
09-20-2008 Chan Stevens Est SU C6-3 Didn't Record 0-5 mph winds - Pod broke loose during boost.
05-17-2009 Chan Stevens Est SU C5-3 None - Unstable 10+ mph winds - Motor pod separated

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