calculating reentry angles

[Alexw95]

i have used the search function and google already but i can not find a formula for calculating the reentry angle for a earth reentry from a stable orbit all you would need to know is the apogee and the perigee correct if your doing a reentry for earth if someone could paste a formula for this it would be greatly apprichiated

 

[tblaxland]

You can use the formulae on this page to calculate the flight path angle (same as reentry angle) at the altitude of entry interface (which you need to define - typically 100km or 120km for Earth): [ame="http://en.wikipedia.org/wiki/Elliptical_orbit"]Elliptic orbit - Wikipedia, the free encyclopedia[/ame]

 

[Tommy]

An easy way to find a re-entry angle without doing any math (assuming you are in orbit) is to use IMFD's Delta-V program and IMFD's Map program. Use Map (shared to Delta-V) with Plan enabled, and in Re-Entry mode (hit the <MOD> button twice). As you enter a negative dVf in Delta-V, Map will show the hypothetic PeA and ReA. Then you can either use Delta-V's autoburn to execute the de-orbit burn, or perform a manual burn to lower the PeA to the correct altitude.

IIRC, Entry Interface altitude is set on IMFD's main configuration page.