This is a very easy to fly variant of the wonderful Airbus A380-800_EA created by ViennaLex76. It differs in only a few respects, but improves in many areas:
The four P120-SX JetCat turbines have been replaced by four KJ66 turbines, each producing 92N (nearly 21 lb) of thrust.
However, these turbines only consume fuel at a rate of 237 cc per min each at full throttle (compared to 380 cc per min for the P120-SXs), so the fuel tank has been reduced in size accordingly, from 14.8 litres to 11.5 litres.
There is sufficient fuel to keep the model flying at full throttle for 12 mins, compared to 10 mins for the original EA's 4 x P120-SXs.
The need for a CofG adjustment has been eliminated by adding 1kg of ballast at the nose and reducing the weight of the fin and tailplane.
The fuel tank has been repositioned to sit squarely over the neutral point so that the trim of the model doesn't change as fuel is consumed.
The AUW of the model has been reduced from 87 kg to 79 kg , and the wing loading reduced slightly from 109 g/dm^2 to 101 g/dm^2.
Unused channels have been removed and wheel brakes are now used accross the board.
Most of the controls are as per normal, the differences are noted below:
Negative 100% (-100%) exponential has been added to the throttle at all times to give more precise control of the turbines at low power settings.
The spoilers are now extented by closing the throttle fully and retracted again as soon as the throttle is cracked open slightly - Spoilers on Throttle (SoT).
The wheel brakes are activated by pushing on the stick, i.e. giving 'down' elevator.
A pitch rate gyro has been added to to the pitch channel to limit the rate of change of pitch at high speeds, but still give good pitch authority at lower airspeeds.
The result is a model that can fly 1 metre off the deck at 75 kph without any hint of drama , all the way up to just over200 kph, performing in a realistic, scale-like fashion all the time.
Many thanks to ViennaLex76 for producing the excellent original Airbus A380-800_EA and I hope we will see more fruits of his labour in the future as he is clearly another very talented man.
Great stuff, Lex - Keep 'em coming! Ifyou like to build French airliners, how about the Caravelle? She was one of the 'prettiest' airliners ever!
Nigel_B
P.S. Ghimmy47 suggested reducing the rudder throws by 5 deg or so and I concur.
Reducing the throws of the upper half of the rudder from +30 deg and- 30 deg to +25 deg and -25 deg is a definite improvement. (Guess who doesn't use the rudder a great deal!)
The four P120-SX JetCat turbines have been replaced by four KJ66 turbines, each producing 92N (nearly 21 lb) of thrust.
However, these turbines only consume fuel at a rate of 237 cc per min each at full throttle (compared to 380 cc per min for the P120-SXs), so the fuel tank has been reduced in size accordingly, from 14.8 litres to 11.5 litres.
There is sufficient fuel to keep the model flying at full throttle for 12 mins, compared to 10 mins for the original EA's 4 x P120-SXs.
The need for a CofG adjustment has been eliminated by adding 1kg of ballast at the nose and reducing the weight of the fin and tailplane.
The fuel tank has been repositioned to sit squarely over the neutral point so that the trim of the model doesn't change as fuel is consumed.
The AUW of the model has been reduced from 87 kg to 79 kg , and the wing loading reduced slightly from 109 g/dm^2 to 101 g/dm^2.
Unused channels have been removed and wheel brakes are now used accross the board.
Most of the controls are as per normal, the differences are noted below:
Negative 100% (-100%) exponential has been added to the throttle at all times to give more precise control of the turbines at low power settings.
The spoilers are now extented by closing the throttle fully and retracted again as soon as the throttle is cracked open slightly - Spoilers on Throttle (SoT).
The wheel brakes are activated by pushing on the stick, i.e. giving 'down' elevator.
A pitch rate gyro has been added to to the pitch channel to limit the rate of change of pitch at high speeds, but still give good pitch authority at lower airspeeds.
The result is a model that can fly 1 metre off the deck at 75 kph without any hint of drama , all the way up to just over200 kph, performing in a realistic, scale-like fashion all the time.
Many thanks to ViennaLex76 for producing the excellent original Airbus A380-800_EA and I hope we will see more fruits of his labour in the future as he is clearly another very talented man.
Great stuff, Lex - Keep 'em coming! Ifyou like to build French airliners, how about the Caravelle? She was one of the 'prettiest' airliners ever!
Nigel_B
P.S. Ghimmy47 suggested reducing the rudder throws by 5 deg or so and I concur.
Reducing the throws of the upper half of the rudder from +30 deg and- 30 deg to +25 deg and -25 deg is a definite improvement. (Guess who doesn't use the rudder a great deal!)
