From: Thomas Barclay <Thomas.Barclay@s...>
Date: Tue, 11 Jun 2002 02:57:10 -0400
Subject: Drop caps
Possibly... You're assuming mismatched aerodynamics. I will note, that in this atmosphere, a bowling ball and a feather, the bowling ball comes down faster. Yes, mismatched aerodynamics, but in the other direction than yours.:) [Tomb] I was thinking more like a lawn dart and a streamlined plane. The plane has to carry N persons, the dart but one. Should it not be possible to arrange better aerodynamics for the dart? First statement I won't agree with. Second sounds fine... But also note less fuel... Specifically I doubt it has enough fuel to accelerate and de- accelerate... There's also the fact that at some point, you get a very ineffieciant way to ship people down... Lot of money, mass, and volume per pod for little to no advantage. [Tomb] Less fuel, but it gets a heck of a lot more delta-vee out of the same kgs of fuel. Hence I'm not sure it can't do both accel and decel. But how about we posit a railgun or mag accelerator launch? That'll give you a nice boost without requiring reaction mass. This is a does too does not argument as far as I can see. I don't see any reason why a dropcap can't carry the same proportionate mass of fuel (it has the same heating concerns as the shuttle) but it'll still be lighter and more capable for two reasons: It doesn't have to carry enough fuel to get back to orbit (big point) and it doesn't have to do complex hovering or other near- ground operations (lander might not have to do this either). The lander has to carry a more capable system as its targeting is less ballistic and it is expected to be able to make a directed flight back to the source ship. I think the combination of a better potential aerodynamic structure (not trying to move N men to the ground) and an ability to (with the exact same proportion of mass as fuel as your lander) burn all the fuel in the trip down, the drop cap will have a faster time to ground.