Here's a plane designed to bring hydrogen to airports
. Don't trust every pixel and digit of this draft, like the short horizontal stabilizer.
It consumes hydrogen
to emit no carbon dioxide, and is as big as an A380. The 1008m2 wing
has W/L=5.7 only, I take L/D=15 from the Spitfire. Winglets are desired, or maybe the chord splits near the tips and the elements spread as for eagles.
- At sea level and 820t, flaps achieve αCL=1.3 to stall at 100m/s=360km/h=195knots. The displayed blown flaps improve.
- At 8000m (0.526kg/m3), 820t and 200m/s=720km/h=389knots, αCL=0.76.
are slimmer than one, they spread the weight over the runway and the wing. The gears retracted in the tanks drag less. A lifting body or a blended wing-body look worse.
The plane shall take-off or land at 820t. The displayed ellipsoidal tanks host 480t hydrogen
if the rest is light enough. 0.2m foam as on Ariane V weigh 3×13t and can be the core of a sandwich as in the previous message. The heat leak evaporates half as much hydrogen as the fuel cells consume, so some liquid is removed too. Again, hours of heat leak have little effect on the pressure, or they waste little hydrogen.
The 6 ducted fans
blow over D=3.75m, bigger than the Trent.
- At sea level, they accelerate 6×2131kg/s air from 0 to quiet 158m/s with 90% efficiency to push 6×337kN or 820t×0.25g like the A380 and An225.
- The 98% efficient electric motors obtain 6×30MWe from 3×30t fuel cells. 2kW/kg exist at the Toyota Mirai.
- At 8000m (0.526kg/m3), the fans accelerate 6×1511kg/s air from 200m/s to 260m/s to push 6×91kN for L/D=15 and 820t.
- The motors draw 6×23MWe at cruise speed, 77% of the peak power.
The fuel cells need over 6×13kg/s air, easy but must be done. The ducts around the fans can host the fuel cells
. A bit of slowed air can flow radially over a short distance and much area to feed the cells, then the warmer vapour and depleted air expand for ramjet thrust.
The fans could reside at the bodies' aft to reduce the drag. They won't blow the flaps then, and the fuel cell must remain before the wing for equilibrium.
Powered wheels, easy with electricity, would taxi and accelerate the plane more efficiently than the fans alone do. Supercapacitors are bad but accumulators could store descent and braking energy to supplement the take-off and ascent.
My turbulators are the topic of scienceforums
Thoughts about flight motors, hydrogen and more at scienceforums
Waveforms to drive fast electric motors there scienceforums
Aluminium wires scienceforums
Marc Schaefer, aka Enthalpy