User:Urwumpe

OrbiterWiki administrator since december 2005

Lord of the block list

A/S/L: 33/M/Wolfsburg, germany

Occupation: Full-time software developer for computer-aided engineering solutions.

Orbiter addon developer since summer 2003.

N-Mail: Urwumpe(ät)Yahoo(döt)com

We were, We are, and we will be.

Math formulas

Nodal regression

$P$	Orbit parameter, $p=a\cdot (1-{ϵ}^2)$
$u$	corrected true anomaly, $u=\omega +\phi$
$R_E$	mean planetary radius
$J_2$	non spherical gravity term
$i$	inclination
$\omega$	Argument of perigee
$ϵ$	eccentricity

$\frac{d\mathrm{\Omega }}{du}=-3\cdot J_2\cdot (\frac{R_E}{p})\cdot {\sin }^{2}u\cdot \cos i\cdot [1+ϵ\cdot \cos u-\omega ]$

Current Orbiter projects

• Space Shuttle Ultra project
• Black Dart project (military VTOL spaceplane with FBW and TVC)
• Starstreak (suborbital spaceplane)
• Soyuz launcher meshes
• SRTM data-to-mesh converter
• Ares V and Earth 2018 project

Technical Drawing Gallery

Some technical drawings I made, nothing too fancy.

• 
  Alpha Rescue Capsule

Day	Sum	Average
3	31	10.3
4	60	15
5	75	15
6	113	18.8
7	118	16.8
8	157	19.6