niss wrote:
Where is 13?
13 Didn't land. 14 landed where 13 would have landed at Fra Mauro.
Rockie wrote:Polikarpov wrote:Now, is it me or did '16 have a lucky escape? Looks like they could have easily landed a couple of feet to the right and tipped into the crater the lander's shadow crosses.
I saw an interview with Buzz Aldrin a little while ago discussing the Apollo 11 landing. He said when they started the de-orbit burn Neil Armstrong said immediately that they were going to be short of their landing spot. At the time he couldn't figure out how he knew that, but it seems the burn started a second or two too soon that Armstrong "felt" rather than "knew". Sure enough, the automatic landing was going to put them down short of where they intended to land into an uneven area strewn with rocks and obstacles that could have tipped over the lander, or made it impossible to lift off again. Armstrong disconnected the autopilot and manually flew the lander beyond the dangerous area to a spot that was suitable. They touched down with 30 seconds of fuel left.
Those guys had balls as big as houses.
Small correction. They were actually going to land long. The way Armstrong knew about it, was that they had geographical points that they should pass over at a specific time. With the LEM face down during the initial stages of the Powered Decent burn they could look at the surface. He noticed they went by their 3 min point early and inferred they were going to land long.
If I can recall correctly, the reason for landing long was that they under estimated how long it took for the descent engine to throttle up once ignited. Something that either didn't happen or they missed on Apollo 10.
They also ended up actually having more fuel than the 30s. Although at the time they believed that was all that was remaining. They didn't properly account for fuel slosh in the tanks in the 1/6 gravity environment so the sensor under read. In later flights they installed extra baffles in the tank to prevent this.
I agree though, balls the size of houses.
Not so much from a piloting standpoint but from a controller standpoint check out what they had to do on Apollo 14 during powered descent.
BTD