New answers tagged efficiency
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All that's required for any layout -- convention, canard, or three-surface -- to fly with static stability is that the more forward surface(s) must fly at a higher coefficient of lift than the rearward, so that any increase in speed produces a nose-up moment, or a decrease produces nose-down.
With canards, all I've seen fly with positive lift on the canard ...
5
No that has no benefits for aviation at all, except for the marketing department. A large amount of losses funnelling the airflow from motor to a small strip, from which it is propelled at high velocity.
As stated in many places on this site, thrust T = $\dot m \cdot \Delta V$, while the energy expelled E$_{kin}$ = $½ \cdot \dot m \Delta V^2$. So thrust ...
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Low aspect ratio means more chord. More chord means
lower lift coefficient. This will move the operating point of the blade airfoil to a less efficient polar point. Since torque and RPM stay constant, a wider blade cannot absorb more energy and compensates for the higher chord with a proportionally lower lift coefficient.
more area. You rightly note that ...
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Scramjet has the advantages of simple structure, light weight, low cost Unit thrust (thrust generated by propellant per unit mass flow) high and fast. Compared with rocket engine, scramjet does not need to carry oxidant. Therefore, it has a larger payload and is suitable for the power of hypersonic cruise missile, hypersonic aircraft, transatmospheric ...
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