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Modified Oxy-Hydrogen (MHHO) gas is being produced by a modified, ultrasonically and UV-LED-activated water electrolysis. Such a modified water electrolysis consumes very little power (0.8Wh/L) which makes the MHHO's production cost almost zero. The only consumable for MHHO's production is water - fully recyclable. The only waste after MHHO's burning is water too. 0% harmful emissions.
MHHO was patented in 2011 by the Japanese scientist Dr. Ryushin Omasa as "Ohmasa Gas". Unlike Ohmasa Gas, MHHO is being produced off-grid.
MHHO has the unique property to be safely liquefied at  -178 deg.C/1bar and stored in LNG bottles, unlike the pure Hydrogen, which can be liquefied at much lower temperature of  -253 deg.C and cannot be stored in regular LNG bottles because of the high leakage danger and permeation/embrittlement material destructive effect observed. No such effects observed with the MHHO, after years of storing in CNG or LNG bottles.
In this liquefied form MHHO can be successfully used as a safe, lightweight, compact and ultra-dense fuel for various aircraft's or else gas-turbine, reaction, or pulse-detonation rocket engine applications.
Unlike the rocket engines, LMHHO contains hydrogen and oxygen together in one volume. It needs NO AIR to combust, because it contains oxygen itself. This could be of a great advantage for the aircraft's construction with removing the  air-breathing inlets, which cause negative effect on the aircraft's aerodynamic properties.

More info about MHHO - 
Gas turbine produces both reactive thrust and rotation power
Reactive thrust can be directed through adjustable, vectoring nozzles, similar to the Harrier fighter's ones, for the aircraft's combined vertical lifting/lending and horizontal propulsion (VTOL)

Additionally, the gas turbine's rotation shaft can drive an Alternator for electricity generation, for supplying electric-motor propellers, which the aircraft could be additionally equipped with.
Electric-motor Propellers are a moderate, low-noise and suitable vertical-lifting/lending option, perfectly applicable for smaller, individual aircrafts for everyday usage, inside, or close to residential areas.  

After lifting at a higher altitude by the quiet electric propellers, the aircraft's reactive engine can be accelerated to it's full power for aircraft's full-speed motion. Modified Oxygen-Hydrogen (MHHO) liquefied gas could be used as a compact, safe and lightweight fuel for pulse-detonation rocket engines as well, for reaching ultrahigh hypersonic speeds over 25 Mach.
There is also a possible option for propeller's  turbine/pneumatic motors, driven directly by a part of the gas-turbine's / rocket engine's thrust. Thus there will be no need of alternator and electric motors.
Another one, fully-noiseless option allows pure Hydrogen to be produced on-board out of the safely stored liquefied MHHO, after it's warming and evaporation, and H2-O2 separation through a molecular-sieve membrane. Pure Hydrogen can be used for electric power generation by a Hydrogen Fuel Cell. This noise-free option is particularly applicable for electric cars and else vehicles or facilities, and also for quiet household or industrial power plants.

MHHO HYBRID JET ENGINE with combined gas-turbine / electric motor propulsion, for vertical / horizontal motion
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