Posted on 11/03/2015 5:39:12 PM PST by Jack Hydrazine
Not Jimmy Buffet fan? I am not really, despise his politics, but he had some great tunes. Margaritaville, etc.
A boat drink is most any tropical libation of fruit juice and rum/whatevers..............
The cut footage is not a good sign.
It was launched to the south.
No trails to be seen. know what to look for.
I think the launch azimuth was 94.7 degrees making it polar orbit but running east to west.
Here’s a launch video that was posted to GoogTube.
https://www.youtube.com/watch?v=QsMegDZ_VFQ
Another launch video.
https://www.youtube.com/watch?v=i30zxnUFdNE
From the on-board video it looks like there was a pitch-roll coupling problem that developed.
What is pitch-roll coupling?
Inertial Roll coupling
Also known as Pitch-Roll coupling or Yaw-Roll coupling, Inertial Roll coupling is a “resonant divergence in pitch (or yaw) when roll rate equals the lower of the pitch or yaw natural frequencies”, according to Reference 1. In other words, this term describes a phenomenon whereby dynamic instability of a rocket (or other flight vehicle) develops under certain flight conditions with potentially catastrophic consequences, if that vehicle has the mass and geometric configuration that makes it susceptible.
The concept of roll and pitch is shown in Figure 6. If a rocket rolls, it will rotate about its own principal axis, the line of least resistance, rather than the flight path (geometric axis), as illustrated in Figure 7. The position of the principal axis is determined by the particular placement of items of mass that make up the rocket. If the angular difference between the principal axis and the geometric axis is sufficiently large, and if the rocket rolls sufficiently quickly, the destabilizing moment from the inertial forces will overcome the stabilizing aerodynamic moment provided by the fins. The centrifugal force due to the roll will cause the nose and tail to try to swing out perpendicular to the rotation axis.The rocket will become directionally unstable, with the pitch angle continually diverging, developing a wobble or coning motion, to the point where the vehicle’s structural limit is exceeded, leading to break-up. In order for the rocket’s principal axis to be different than the geometric axis (dynamically unbalanced), the distribution of the various components that make up the mass of the rocket would have be uneven, with respect to the centreline of the rocket (geometric axis). Components of the rocket such as the fuselage, fins, nosecone, and motor are generally symmetrical about the rocket’s centreline axis, and would not contribute to dynamic imbalance. However, certain items of mass, typically payload items, may have a centre of gravity (CG) that is not in line with the centreline of the rocket. It is these items that offset the principal axis and lead to dynamic imbalance and the potential for inertial roll coupling.
http://www.nakka-rocketry.net/ep_lr7.html
Sucks for the UH kids that put in all that work on Cubesats for the flight. I know the Cubesat thing was a huge deal at UH.
Aloha!
Well, that IS 4.7° south of due east, so I suppose that could be called "southerly"?
No way I would ever see that from here, was hoping for a due south or SSE launch.
Meanwhile my countdown has over a year.
Update on the launch failure. I was correct about the pitch-roll problem it developed.
http://www.nasaspaceflight.com/2015/11/super-strypi-spark-inaugural-launch/
I was incorrect it’s launch azimuth. It is actually 97.4 degrees per the same article above.
“The target orbit for Tuesday’s mission was a polar low Earth orbit with a perigee of 413 kilometres (257 statute miles; 223 nautical miles), an apogee of around 489 kilometres (304 miles, 264 nautical miles) and an inclination of 97.4 degrees.”
Keep in mind that orbital inclination (and in this case the launch azimuth is the same) defined as...
“the angle of the satellite’s orbital plane with respect to the Earth’s equatorial plane. Measure starting from due East on the equator, and trace an angle to the orbital plane on the side of the equator in which the satellite is travelling after it crosses. Inclinations always measure between 0 and 180 degrees. An orbit with an inclination between 0 and 90 degrees is considered prograde or direct (many astronomers prefer the latter term when it comes to natural satellites) and travels with the direction of the Earth’s rotation. An orbit with an inclination between 90 and 180 is retrograde and travels against the Earth’s rotation. A satellite with a 90 degree inclination is said to have a polarorbit, and does not have an east-west directional component.”
http://www.planetary.org/blogs/guest-blogs/jason-davis/3450.html?referrer=https://www.google.com/
So when you see 97.4 degrees it means south of east.
They’ll get it right next time!
Likewise!
I see the problem, it hit that street light.
No Obama
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