Space Ship One, the first private manned space ship, is known for its unusual fuel. What is it?

water
hydrogen
sodium hydroxide
rubber
Space­ShipOne is an ex­per­i­men­tal air-launched rock­et-pow­ered aircraft with sub­or­bital flight ca­pa­bil­i­ty at speeds of up to 900 m/s using a hybrid rocket motor. Tier One uses a hybrid rocket motor supplied by SpaceDe­v, with solid hy­drox­yl-ter­mi­nat­ed polybu­ta­di­ene (HTPB, or rubber) fuel and liquid nitrous oxide ox­i­diz­er. It gen­er­ates 88 kN (20,000 lbf) of thrust, and can burn for about 87 s (1.45 min).

Answers distribution

water
hydrogen
sodium hydroxide
rubber
answers
flagthe United Kingdom
13%
38%
13%
33%
36
flagPoland
9%
35%
26%
27%
1426
flagGermany
0%
23%
52%
23%
17
flagthe United States
10%
60%
10%
20%
10
flagUnknown
7%
56%
20%
15%
65

Gender

men22%
women26%
water
9%
11%
hydrogen
42%
34%
sodium hydroxide
25%
28%
rubber
22%
26%

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Space Ship One, the first private manned space ship, is known for its unusual fuel. What is it?
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Author: Tschuka
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