Development of a Mass Estimating Relationship Database for ...
Development of a Mass Estimating Relationship Database for ...
Development of a Mass Estimating Relationship Database for ...
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3.0 Body<br />
3.0 Body<br />
A as – surface area <strong>of</strong> aft structure<br />
A body – surface area <strong>of</strong> vehicle body<br />
A body-tank – exposed area <strong>of</strong> body minus exposed area <strong>of</strong> integral tanks<br />
A exit – Total exit area <strong>of</strong> main engines<br />
A inlet – cross sectional area <strong>of</strong> inlet<br />
A tank – Surface area <strong>of</strong> tank<br />
b body – Maximum width <strong>of</strong> the body<br />
D eng – Diameter <strong>of</strong> a main engine<br />
D nose – Diameter <strong>of</strong> the nosecone base<br />
F ullage – Ullage fraction (typically ~4 to 5%)<br />
F prop – Propellant fraction <strong>of</strong> either oxidizer or fuel<br />
H body – height <strong>of</strong> body<br />
H inlet – Height <strong>of</strong> engine inlet<br />
Isp – Specific impulse <strong>of</strong> engines<br />
L – Length <strong>of</strong> vehicle<br />
L inlet – Length <strong>of</strong> engine inlet<br />
L s – Length <strong>of</strong> single duct (<strong>for</strong> Y inlet ducts)<br />
m& − Total propellant mass flow rate (lbm/s)<br />
M body – Total mass <strong>of</strong> body group<br />
M eng – <strong>Mass</strong> <strong>of</strong> a single main engine<br />
M glow – Gross lift<strong>of</strong>f mass<br />
M gross – Gross vehicle mass on the pad or runway prior to lift<strong>of</strong>f<br />
M insert – Insertion mass, sometimes called burnout mass<br />
M land – Landed mass <strong>of</strong> vehicle<br />
M pl – <strong>Mass</strong> <strong>of</strong> payload<br />
M strapon – <strong>Mass</strong> <strong>of</strong> strap on boosters<br />
M tot_fuel – <strong>Mass</strong> <strong>of</strong> all fuel on stage<br />
M tot_ox – <strong>Mass</strong> <strong>of</strong> all oxidizer on stage<br />
S body<br />
L<br />
b body<br />
Georgia Institute <strong>of</strong> Technology 3-1
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