Maximum take-off mass (MTOM)
Short overview by Scienceinsight
Article AV126
Definitions
MTOM, WTO := Maximum take-off mass, oder:
MTOW := Maximum take-off weight, oder:
TOGW := Take-off gross weight
OEM, WE := Operating empty mass
Conventionally powered aircraft:
MTOM = OEM + ${m_{Fuel}}$ + ${m_{payl}}$
MTOM = $\frac{m_{payl}}{1-\frac{m_{Fuel}}{MTOM}-\frac{OEM}{MTOM}}$
${m_{Fuel}}$ := Mission fuel mass (WF)
${m_{Fuel}}$ := ${{m_{Fuel}}_{,used} + {m_{Fuel}}_{,res}}$
${m_{payl}}$ := Mission payload mass
$\frac{m_{Fuel}}{MTOM}$ : = Fuel fraction
${m_{Fuel}}_{,used}$ := Fuel used during the mission
${m_{Fuel}}_{,res}$ := Fuel reserve required for the mission
$\frac{OEM}{MTOM}$ : = Empty mass fraction
$n$ := Mission phases total
${m_{ff}}$ bzw. $W_{Mi}$ := Mission fuel fraction mass
${m_{ff}}$ = $W_{Mi} := \frac{W_{1}}{W_{TO}}\pi_{i=1}^{i=n-1}\frac{W_{i+1}}{W_{i}} = \frac{W_{n}}{W_{TO}}$ $\Leftrightarrow$
${m_{ff}}$ = $W_{Mi} := \pi_{i=1}^{n}\frac{W_{i}}{W_{i-1}} = \frac{W_{i}}{W_{0}} = \frac{W_{n}}{W_{TO}}$
Hydrogen fuel cell powered aircraft
Hydrogen fuel cell powered aircraft incorporate new components. The design of these new hydrogen-based components influences the aircraft geometry and necessitates modifications to the formula above.
New components to be considered include:
Hydrogen fuel cell powertrain: e.g., hydrogen tank, fuel cell,
Hull geometry and mass due to the use of a hydrogen fuel cell propulsion system,
Other relevant powertrain and auxiliary components: e.g. novel pipe systems