Suomeksi

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General information of the OH-XKD

• Manufacture & Type / Builder
• Van's Aircraft RV-4 / Jukka Kaipio
• Two seat experimental aircraft, that is used from cross-country flying to sport aerobatics
• First flight
• 20th of June 1995
• Engine / propeller
• Lycoming O-360-A1A
• Power 180hp -> 2700RPM, 28.2 in. Hg. (0.95bar)
• Engine displacement 360in^3 (5,9litres)
• Aircooled 4-cylinder boxer (flat-4)
• Weight 286lb (130kg)
• Compression ratio 8.5:1
• Fuel 91/96, 100/130 or AVGAS 100LL
• Hartzell constant speed propeller
• Propeller diameter 72inch (183cm)
• Weight 51lb (23kg)
• Blade tip distance from ground is less than 5.4inches (14cm) when plane is at level
• Ellison pressure carburator
• Christen oil system
• Weight
• Empty weight 1076lb (488kg)
• Gross weight 1653lb (750kg) -> usable load 577lb (262kg) -> full tanks + 388lb (176kg) (two persons + luggage)
• Max weight in aerobatics 1375lb (624kg) -> usable load 299lb (136kg) -> 198lb (90kg) pilot + 17 US Gall (65l) fuel
• Center of gravity in above cases
• Speeds
• Vne, velocity never exceed 210mph (338km/h, 182Nm/h)
• Va, maneuvering speed 135mph (217km/h, 117Nm/h)
• Speed while in traffic circuit 85mph (137km/h, 74Nm/h)
• Stall speed without flaps 58mph (93km/h, 50Nm/h)
• Stall speed with 40° flaps 54mph (87km/h, 47Nm/h)
• Cruising speed at 8000ft and 65% Power is 195mph (314km/h, 170Nm/h)
• Takeoff distance and landing distance
• Takeoff distance over 49ft (15m) obstacle is 787ft (240m) (ground roll 427ft (130m))
• Manifold pressure 23in, weight 1500lb (680kg), no flaps where used
• Landing distance over 49ft (15m) obstacle is 886ft (270m) (ground roll 492ft (150m))
• Full flaps where used (40°)
• In practise, the runway should not be shorter than 1300ft (400m), as the landing is not always perfect

• Endurance / range (1500ft MSL)
• 3,5h
• 435Nm (805km) + 45min reserve
• RPM 2300, Manifold pressure 23 in. Hg. (0.78bar), Speed 158Nm/h (293km/h, 182mph), Consumption 9.2 US Gall/h (35l/h)
• Size of fuel tank
• 32 US Gall (121l, 86kg)
• Long term consumption
• Monitoring period: 115 hours
• Total number of flights: 207
• Number of landings/takeoffs: 379
• Flights that have included aerobatics: 33
• Total consumption: 972 US Gall (3679l)
• Average consumption: 8,4 US Gall/h (32l/h)
• Stress limits
• ±6G
• Home base
• EFHA

True speed has been measured by using GPS.
True speed is measured by flying to four different directions (0, 90, 180 and 270 degrees) and calculating the average. Percentage value is calculated sea level output power with given RPM and manifold pressure.
Note:
1) At 8000ft altitude, the air density has decreased and therefore the speed indicator value must be multiplied with 1.128 (std temp). True airspeed should never be higher than 210mph Vne -> Therefore at 8000ft altitude the speed indicator should never show higher than 186mph (std temp).
2) Actual output power at 8000ft is slightly more than output power at sea level when RPM and manifold pressure are equal.

Panel

How fast?

Cruising speed with favorable winds... 257mph (413km/h, 223Nm/h)

Tail cam

Local flight...

Cruising...