The Facetmobile (properly, FMX-4 Facetmobile) is a homebuilt aircraft designed by Barnaby Wainfan, a well known professional aerodynamicist and homebuilt aircraft expert. Also known as amateur-built aircraft or kit planes, homebuilt aircraft are constructed by persons for whom this is not a professional activity
While only one Facetmobile prototype was produced, it has become well known due to its unique nature. The aircraft is somewhat of a cross between a lifting body and flying wing configuration - the whole aircraft is one low aspect ratio wing: a flat, angular lifting shape. The lifting body is an Aircraft configuration where the body itself produces lift. A flying wing is a Fixed-wing aircraft which has no definite Fuselage, with most of the crew payload and equipment being housed inside the main wing structure In Aerodynamics, the aspect ratio of a wing is defined as the square of the wing span divided by the wing area WING "ESPN 1410" is a commercial AM radio station in Dayton Ohio operating with 5000 watts at 1410 kHz with studios offices and transmitter located on David Particularly notable is that the aircraft's shape is formed of a series of 11 flat surfaces, somewhat similar to the body of the F-117 Nighthawk jet strike aircraft, but without separate wing structures. The Facetmobile was designed prior to the public disclosure of the F-117 aircraft shape, and Wainfan claims that the visual similarity is coincidental, with very different engineering reasons (the F-117 uses flat panels for stealth technology, the Facetmobile for ease of construction). Stealth technology also known as LOT (Low Observability Technology is a sub-discipline of military Electronic countermeasures which covers a range of techniques used with [1]
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Design
The Facetmobile is a unique design in many ways. [1] [2]
Shape
As noted above, the Facetmobile is a unique airfoil shape, but is generally similar to some other generally low aspect ratio delta wing light aircraft, such as the Dyke Delta models JD1 and JD2, the Hatfield LB1 and LB3, and the ARUP 2.
The FMX-4 Facetmobile shape forms 11 flat planes, plus two wingtip rudders. Three flat shapes form the bottom of the aircraft (slightly inclined front, flat middle, and sharply raised back), and eight form the top (one large downwards sloping rear section, one thin nose section, and three inclined side panels per side). The wing section is an 18% thickness ratio, much thicker than the typical 12-15% thickness of normal light aircraft wings.
Structure
The facetmobile structure is 6061 aluminum round tubes, joined together by rivetted gussets, and covered in a fabric covering.
Specifications
General characteristics
- Crew: 1
- Length: 19 ft 6 in (5. 95 m)
- Wingspan: 15 ft (4. The wingspan (or just span) of an airplane or a Bird, is the distance from the left wingtip to the right wingtip 57 m)
- Height: ()
- Wing area: 214 ft² (19. 9 m²)
- Empty weight: 370 lb (168 kg)
- Loaded weight: 740 lb (336 kg)
- Powerplant: 1× Rotax 503 DC Fixed, 46 hp (34 kw)
Performance
- Maximum speed: 96 knots
- Cruise speed: 80 knots
- Stall speed: 33 knots ()
- Rate of climb: 750 ft/min ()
- Wing loading: 3. In Aviation, V-speeds or Velocity-speeds are standard terms used to define Airspeeds important or useful to the operation of Aircraft, such In Aviation, V-speeds or Velocity-speeds are standard terms used to define Airspeeds important or useful to the operation of Aircraft, such For other uses see Stall. In Aerodynamics, a stall is a sudden reduction in the lift forces generated by an Airfoil In Aerodynamics, the rate of climb RoC is the speed at which an Aircraft increases its Altitude. In Aerodynamics, wing loading is the loaded weight of the aircraft divided by the area of the wing 45 lb/sq ft ()
Media coverage
Media coverage for the Facetmobile design and related concepts has been extensive. Coverage includes:
- Life on the Facet Track, Kitplanes magazine, February 1995. Reprinted online at [1]
- Other print coverage includes articles in:
- KITPLANES: 9/93
- KITPLANES: 2/95 (above)
- KITPLANES: 3/95
- Sport Aviation: 10/94
- Experimenter: 10/94
- Air Progress: 1/95
- Air Progress: 2/95
- Flying: 10/94
- Pacific Flyer: 2/94
- Model Builder: 10/96
- Flight (Air Age): Nov/Dec 1996
- Volare Sport (Italy): 10/94
- Aero Revue (Switzerland): 6/95
- Aircraft Illustrated (UK) 5/95
- Contact Issue #71
- Popular Science: January 2005
Current status
The prototype FMX-4 Facetmobile crashed on October 13, 1995, after an in-flight engine failure. The aircraft landed at low speed into a barbed wire fence which caused extensive skin, engine, and some structural damage, though there was no injury to the pilot (Barnaby Wainfan). Barbed wire, also known as barb wire (and frequently in dialect form spelled bob or bobbed) is a type of fencing Wire constructed As of 2006, the aircraft has been partially repaired but not flown again.
Derivatives
Wainfan has proposed two derivative aircraft based on the FMX-4 Facetmobile.
- FMX-5 Facetmobile, a larger 2-seat design using the same aluminum tube and fabic construction.
- An unnamed similar 2-seat design using advanced flat composite panel construction.
Models
At least one commercial model airplane kit of the Facetmobile is in production. [4]
References
- ^ a b Barnaby and Lynn Wainfan's Facetmobile page, accessed Oct 24, 2006
- ^ Facetmobile FAQ, accessed Oct 24, 2006
- ^ NASA LARC NAG-1-03054 "Feasibility Study of the Low Aspect Ratio All All-Lifting Configuration as a Low-Cost Personal Aircraft", Barnaby Wainfan and Hans Neiubert, February 2004, accessed Oct 24, 2006
- ^ Incredible Facetmobile, accessed Oct 24, 2006
External links
- Barnaby and Lynne Wainfan's Facetmobile page, accessed Oct 24, 2006. Also available at www.facetmobile.com
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