Coolton Ascent

---

Popularity Popularity Featured Price: Low to High Price: High to Low Avg. Available for download now.

Light Jan 15, The Cause of Marlene Rose Jan 18, Coolton Ascent Jul 31, The Meaning of Hunger. Provide feedback about this page. There's a problem loading this menu right now. Get fast, free shipping with Amazon Prime. Get to Know Us. Force, F, is a combination of gravity, thrust during the deorbit burn only , and atmospheric drag. Mass, m , is a constant for this simulation. Acceleration, a , is integrated to find the velocity and the position of the spacecraft over time.

The only hard part is doing it all in polar coordinates. For this I turned to my mechanics textbook:. That book, which I haven't used really at all since freshman physics , is notoriously difficult as you can probably guess by the title and lack of cover art. Because of it I spent many hours calculating the fractional change in observed gravity on a hydroplane traveling at mph in each of the four cardinal directions at the equator hint: But luckily in this case I just needed a simple formula that shows up by page The differential equations are more complex than in the Cartesian coordinate system of x and y positions, but they are still easy to simulate, once you know the forces at work on the ship.

These are gravity , drag , and thrust. All easy to calculate.

Okay, drag is a little hard. Anyway, the output of the deorbit simulator is two trajectory graphs:.

Reddit Books Online Coolton Ascent Pdb B008rmh9g6 By Rebecca J Cunningham

The left-most graph shows three trajectories altitude vs. The yellow is the undisturbed orbit: The purple is after the deorbit burn, but not including the effects of atmospheric drag. This would be the unpowered descent trajectory of the ship on a body with no atmosphere. Finally, the blue trajectory includes atmospheric drag. It only really diverges from the purple trajectory in the thick lower atmosphere. Where the altitude reaches zero is the theoretical landing site based on the deorbit burn entered. I use the term "landing site" loosely above. I have cautiously labeled the x-axis of the left-most graph "sidereal angle", the angle of the orbit with respect to the stars.

So it's not exactly the longitude, because the body being orbited is also rotating at some speed.

My Projects

So it's important to account for the offset introduced by the body's rotation in determining the final landing site or, if the final landing site is known, calculating exactly when to execute the deorbit burn. For this purpose, the right-most graph is useful. It shows the same trajectory, but as a function of time rather than orbital angle.

The time between the deorbit burn and touchdown can be used to calculate the offset due to the body's rotation. For example in the trajectory above, the deorbit burn occurs at s and touchdown occurs at about s. So the entire deorbit takes s, just under 12 minutes. So that's the trick, then: On Kerbin I use the center of this crater. Picking a landing site and a burn target on Laythe is a bit harder, since there is so little land to work with.

But I think I have a good candidate:. That landing site has to be at the equator in order for the ascent to have any chance of working. It also should be relatively flat. Tricky, but it seems feasible. It would also be possible to intentionally aim for the far edge of the landing site and use either early parachute deployment or short bursts of propulsion to adjust backwards if needed.

Undershooting, on the other hand, would be disastrous. There is a small subtlety in this deorbit simulation that I didn't realize until I created the ascent simulation below.

It's that the atmosphere is, at least to some extent, rotating with the body. So the drag force amplitude and direction are not exactly opposed to the absolute direction of the craft. They are instead determined by the relative motion between the craft and the air. I added this in as a switchable option in the simulation lines or The effect is noticeable:. Laythe rotates over twice as slowly as Kerbin,though, so the variation will be less, I think. Staged Ascent Simulator File: Evaluate whether a multi-stage ascent craft can reach stable orbit.

Getting a ship into Kerbin orbit is the first and most daunting challenge in Kerbal Space Program.

A massive amount of fuel and careful management of mass by staging used-up fuel tanks and rockets is the only way to push through both gravity and aerodynamic drag to get up to orbital speeds. But instead of this:.

One ITS2 main ship, fully-fueled minus a small amount used for deorbit and soft landing on Laythe. By the numbers, it has enough delta-V capability to reach Laythe orbit. Provide feedback about this page. There's a problem loading this menu right now.

Similar authors to follow

Get fast, free shipping with Amazon Prime. Get to Know Us. English Choose a language for shopping. Amazon Music Stream millions of songs. Amazon Advertising Find, attract, and engage customers. Amazon Drive Cloud storage from Amazon.

External Links

Alexa Actionable Analytics for the Web. AmazonGlobal Ship Orders Internationally.

• Region - Nation - Europa: Die Dynamik regionaler und überregionaler Identifikation (German Edition)
• Kuminda Dushi: lecker essen auf Curacao (German Edition)
• All About Grieving
• Leni Behrendt 10 - Liebesroman: Die Menschen, sie nennen es Liebe (German Edition)
• Soul Sculpture
• Health and Aging 101: What Makes You Tick