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Hannes90

Update: 05 Oct 2014

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Cherry BX-2
(Excerpt of designer’s information-brochure)



HB-YDH-400


      - Designer
      - About the aircraft
      - Technical facts
      - Constructional guideline
      - Hangar/transportation
      - Building/steps
      - Homebuilders requirements
      - Project-file


      Designer:              
      Max Braendli / Switzerland    
      (* 31.03.1924 - † 15.06.2009)  

                                             About the designer Max Braendli


       


About the aircraft


Light-weight-aircraft, 2 seats (side by side), composite-construction (lumber, Styrofoam,  glass - fiber and epoxy).
Low-wing monoplane with quick removable Wings and retractable nose-wheel-landing-gear. 
The Flap movement is transferred to the aileron in a reduced rate.
Stabilator with anti-servo-flap. Nose-wheel-steering and a shock-absorber (rubber) for the nose-landing-gear.
Main-landing-gear made of strands on a lumber-core, hydraulic-brakes simultaneously applied by lever.
Full-sight canopy slides opens in fwd direction.
Rudder is cable-controlled, stabilator- and aileron by push rods.


Technical facts

 

Comparison of S/N 001
( A - 65 )
to a 100 hp ( 912 S )
and 600 kg MTOW
Cherry

Max in Marville Mai 2008 - 380

Christian in Grenchen 2009 - 380

Cherry Bx-2

Performance data HB-YBX (A-65 engine)

Performance data OE-CRM ( Rotax 912 S)

Wingspan

7 m

7 m

Length

5,23 m

5,25 m

Height

2,03 m

2,04 m

Width (Cockpit)

1 m inside (1,1 m outside)

1 m inside (1,1 m outside)

Width without wings

1,96 m

1,96 m

Wheels

3 EA  4” x 4” (300x100 mm)

3 EA  4” x 4” (300x100 mm)

Empty weight

315 kg

373 kg

Fuel

82 Liter / 57 kg

105 Liter

Useful load

178 kg

227 kg

MTOW

550 kg

600 kg

G-loads

Normal category + 3,8 / - 1,9

Normal category + 3,8 / - 1,9

Engine

Continental A 65

Rotax 912 S

Power

41,81 KW (65 hp) @ 2300 rpm

73,6 KW (100 hp) @ 5800 rpm (max. 5 min)

Fuel consumption / hour

13 - 14 l/h -cruise-

16 - 18 l/h -cruise-

Cruising speed (2-seater)

ca. 200 Km/h  (108 kts)

127 kts (235 km/h @ 18 L/h) - 120 kts (@ 16 L/h)

Useful fuel

80 Liter

103 Liter

Endurance

80/14 = 5,7 h  mit 220 km/h = 1254 km

103/18 = 5,6 h  @ 127 kts = 807 NM (1494 km)

Fuel consumption / distance

app. 7 liters / 100 km

ca. 7,6 Liter / 100 km

VNE

275 km/h (171 mph oder 149 kt)

275 km/h (171 mph oder 149 kt)

Best climb (@ MTOW)

2,6 m/sek (512 ft/min) to 3000 ft

1000 ft/min @ MSL

Best climb (solo)

3,7 m/sek (728 ft/min) to 3000 ft

1200 ft/min @ MSL

Takeoff distance @ MTOW Concrete (grass)

Takeoff:  290 (380) m
Landing:  150 (150) m

Start:  236 m (460 über 15m)
Landung:  210 (200) m

Noise level

63 db

64 db


 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Constructional guideline

The load-assumptions, speed-rating as well as equipment were taken from the American
FAR 23 which is also valid in Switzerland. 
Nevertheless the aircraft remains an “ Experimental ”.
A Good aerodynamic was chosen to save Performance, along with economy and low noise emission.
Dimensions were kept compact rather than increasing wing aspect ratio for even better aerodynamics.
The construction was based on own manufacturing-facilities (welding and painting outside). 


Hangar/transportation

Permanent hangar-space is not necessary for the aircraft.
For transportation both stabilizer-halves are removable and can be stowed in the Cockpit.
Then the ”Cherry” will be towed on a simple trailer and fixed. By pulling a bolt the Wings 
(30 Kg) can be removed and fixed on the trailer beside the fuselage.



Disassembling and loading take approximately 15 minutes.





Same applies for unloading and assembling were all necessary connections are made  automatically.
The weight of the loaded trailer is about 600 kg.


Building/steps

In order to save limited space with fuselage and wings, small parts and assembly - units should be manufactured at first.


Main-stages of manufacturing:

- Material-procuring (bit by bit is OK)
- Mounts, fittings, wood-ledges, spars
- Stabilizers and vertical-fin
- Main spars
>>> Inspection by examiner  <<<
- Pre-assembling of main-landing-gear
- Wings and flaps (including lamination)
- Fuselage-side-walls
- Fuselage-assembly-cradle
- Assembling of fuselage (excluding tank and aft-upper-deck)
- Installation of mean-spar into the fuselage
>>> Load-test and inspection by examiner <<<
- Landing-gear installation
- Installation of controls
- Attaching tail-Unit
- engine-installation
- Fuel-tank-manufacturing and installation
- Aft-upper-deck
- Canopy-frame
- Cowling
- Surface, priming, painting
- Final-assembly, instruments, electric-system
>>> Final inspection by examiner, weigh, 1st  run <<<


Homebuilders requirements

The aircraft is not built in a primitive manner and requires anywhere from good up to advanced craftsmanship.
The project requires about 4000 hours.
Even if the prototype swallowed just 10 000 SFr till it’s 1st flight (including engine and instruments) it is recommended
to assign at least 20 000 SFr.
During the construction period, which takes a few years, you can easily do without traveling or other expensive activities
and thus save quiet the amount of money needed for this project.


Prior to your decision - consider the following:

- Stability of the living-conditions
- Partner’s way of living
- Theoretical and practical abilities
- Flight training
- Perseverance, health
- Workshop: Size, distance to residence, access, heating, ventilation, water
- Tools, machinery
- Concerns of neighborhood  (noise, smell)
- Finances for building and future flying
- Aircraft - sheltering

But the most important preconditions are spirit of enterprise, self-confidence and good friends.


Project-file

The acquisition of drawings and license is possible for everyone and includes:

1. Duplication-license for one ”Cherry”.
2. All necessary drawings and material-specifications.
3. Written building-specifications with manufacturing-information, working-processes and tips.
4. Advice during building and free inspection of prototype details for your support.
5. Delivering of bulletins relating to prototype-practice and exchange of experiences.

In your own interest do not deviate from the original-construction without prior
consultations with the licenser.


The prototype flew about 2700 hours (3800 flights).

      Obtain a Cherry-Builder-File with a License at www.bx-2.de
 


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