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SAWE Report - Cal Poly San Luis Obispo

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a landing gear retraction scheme similar to an<br />

XB-70 Valkarie as shown in Figure 8.3. The<br />

complexity was necessary due to overall<br />

configuration drive of low supersonic maximum<br />

cross sectional area.<br />

Due to the Sears-Haack ideal of supersonic area<br />

distribution the nose gear could be easily placed<br />

in the forward fuselage. No need for complex<br />

folding arrangements led to the selection of a<br />

standard side-by-side tire configuration. The<br />

complete retraction schemes and nose wheel<br />

configuration can be seen in Figure 8.4. The<br />

completed landing gear configuration can be<br />

seen in Figure 8.5.<br />

The braking system for both the nose gear and<br />

main gear configuration would use a standard<br />

rotor disk braking mechanism. The heat-sink<br />

Figure 8.2 - Landing Gear Configuration Trade<br />

Study<br />

Figure 8.3 - Main Gear Retraction Sequence<br />

Figure 8.4 - Nose Gear and Main Gear Retraction Schemes<br />

will be made of carbon rather than steel because of the fact that carbon is superior to steel as it<br />

has a higher thermal conductivity and temperature limit, and the thermal expansion of carbon is<br />

lower. The only drawback to carbon brakes is the lower density of carbon compared to that of<br />

53

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