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Two stage rocket

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Emerald III
1 ACCEPTED SOLUTION

Accepted Solutions

Re: Two stage rocket

UK Mathcad Prime Minister is one user of our site about rockets calculation

See please more David Cameron watched Tim Peake's space launch and everyone's laughing at him - Mirror Online

DC-Rocket.png

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65 REPLIES 65

Re: Two stage rocket

Three stage rocket:

9-40-Rocket-3.png

Re: Two stage rocket

Hi Vallery. Nice example. I guess that what you can remark there is that the equation Force = mass x acceleration isn't true!. Newton equation is Force = dp/dt.

Re: Two stage rocket

AlvaroDíaz wrote:

Hi Vallery. Nice example. I guess that what you can remark there is that the equation Force = mass x acceleration isn't true!. Newton equation is Force = dp/dt.

Thanks, Alvaro.

See please One Rocket (пуск ракеты с подводной лодки)

sok-g.png

sok-wolfram.png

Re: Two stage rocket

Hello Valery,

technically the Soyuz is a two-and-a-half (2 1/2) stages rocket as the four boosters start together with the core stage which continues running after the booster have separated. 🙂

Raiko

Re: Two stage rocket

Tanks, Raiko, I Know it. See please - Союз (ракета-носитель) — Википедия

I would like to solve this task with Союз with my students - see Московский лицей 1502. Класс 10-10

Can you help us? With Alvaro and... Isaak!

It is very interesting optimization problem. What is an objective function?!

PS

g=g(h(t), altitude)

See please my Mathcad Web-sheet http://twt.mpei.ac.ru/MCS/Worksheets/g-h-psi.xmcd

Re: Two stage rocket

Hi Valery. Hope this helps.

Best regards.

rocket.gif

Re: Two stage rocket

Thanks, Alvaro.

But better with units in Prime.

I would like to solve this task 24/10/2015 with my students - see Московский лицей 1502. Класс 10-10

Re: Two stage rocket

g is a function - not constant:

Rocket-g.png

Prime

Rocket-g-Prime.png

Re: Two stage rocket

Valery: your ode is mv'+mg=F, true if m constant. But m=m(t) and vary, so you lost the therm m'. The above mc11 ode, and the attached is the same. Newton's law is F=dp/dt.

Best Regards.

PD: Wau! What's an experience work in prime!. I'm need hollidays after this.

rocket.gif

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