- #1
Albertgauss
Gold Member
- 292
- 37
Hi all,
I'm having some trouble understanding conflicting information on the web.
1) I know that a gravitational assist on a spaceship around a planet can increase the spaceship's speed with respect to the solar system. A gravitational flyby will not work for ships that stay within the solar system if the sun is used, because the sun is at rest with respect to the solar system.
2) However, there is another effect, the Oberth Effect, where, if one fires the ship's engines at point of closest approach to the planet assiting the flyby, this different effect will also boost the ship's speed. It seems that such an Oberth Effect CAN boost a ship's speed as it passes around the sun, and on one TV show I saw, up to 300 km/sec. It is not used because no technology can handle the heat of the sun were a ship to fly close enough.
Is the statement 2) wrong? If it is right, does anyone know how to calculate what the boost in speed a ship would have in an Oberth Effect around the sun, or any reliable websites that provide accurate numbers or formula? Is the Oberth Effect dependant on the Gravity Assist in anyway, or are they really two, distinct phenomenon? (assume our ship has the heat shield)
I'm having some trouble understanding conflicting information on the web.
1) I know that a gravitational assist on a spaceship around a planet can increase the spaceship's speed with respect to the solar system. A gravitational flyby will not work for ships that stay within the solar system if the sun is used, because the sun is at rest with respect to the solar system.
2) However, there is another effect, the Oberth Effect, where, if one fires the ship's engines at point of closest approach to the planet assiting the flyby, this different effect will also boost the ship's speed. It seems that such an Oberth Effect CAN boost a ship's speed as it passes around the sun, and on one TV show I saw, up to 300 km/sec. It is not used because no technology can handle the heat of the sun were a ship to fly close enough.
Is the statement 2) wrong? If it is right, does anyone know how to calculate what the boost in speed a ship would have in an Oberth Effect around the sun, or any reliable websites that provide accurate numbers or formula? Is the Oberth Effect dependant on the Gravity Assist in anyway, or are they really two, distinct phenomenon? (assume our ship has the heat shield)