Since the spinning speeds of the forebody and the afterbody
of a dual-spinning projectile are different in the direction of the axis of the projectile, one degree of freedom (DOF) is added to the six-DOF rigid body dynamic model, which is used as a basis.
The premixer/burner system was composed of three concentric axisymmetric disks connected along their axis with a vertical hollow tube, namely, a forebody disk (C), a hollow fuel injecting disk (B in Figure 1), and the flame stabilizing afterbody
(A) ([D.sub.b] = 0.025 m).
The results showed that the selected truncated cone afterbody
was completely surrounded by the separated flow region, meaning heating would be acceptable.
With a B-4 stand in hand, a co-worker and I walked to the aircraft and removed the top propeller afterbody
. We hooked the prop weight up to the top air-baffle assembly in order to simulate an in-flight condition.
The element to which I afterward learned to attach the greater importance was the incontrovertible fact that the lower and greater part of the void under the afterbody
, constantly being made by the forward motion of the ship, is filled from underneath.
Thanks to sleek lines, a racy looking set of gull-wing doors and a nicely proportioned afterbody
, the TB-10 just looks right.
The presence of a human pilot in an aircraft imposes a variety of cost and weight penalties, such as constrained forebodies (the tapered front part of the airframe as distinct from the cylindrical midbody and the [usually tapered] afterbody
), displays, and environmental-control systems.
During the past few years, the K2 Alpine product development team has been experimenting with several trends in ski design, including the use of deeper sidecuts--a more severe hourglass ski shape (when viewed from above)--which enables a skier to carve turns more forcefully in hard snow; "fat" powder skis with wide fore and afterbody
sections that enable the skis to "float" on soft snow; and shorter skis, which makes turning much easier.
However, adverse flow interactions downstream can occur on the afterbody
at certain flow conditions (speeds and angles of attack) and again must be taken into account in the aerodynamic analysis.
This maintains an afterbody
equivalence ratio gradient between a [[THETA].sub.min] [approximately equal to] 0.35 to 0.20 and a [[THETA].sub.max] [approximately equal to] 0.98 to 0.5, depending on flame condition, as measured with flame ionization detection from local gas samples at the afterbody
exit (Figure 1(d)).