Near-Space Resources - Revision history

Doug.moen: /* Hydrogen and Helium */

2010-03-18T13:41:51Z

Hydrogen and Helium

← Older revision		Revision as of 13:41, 18 March 2010
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	it safely, to be our safety officer.		it safely, to be our safety officer.
	Dangers of hydrogen are discussed here: http://www.eoss.org/pubs/faqloon.htm		Dangers of hydrogen are discussed here: http://www.eoss.org/pubs/faqloon.htm
		+
		+	The difference in buoyancy isn't huge.
		+	At IUPAC standard temperature and pressure, 1 cu m of Helium weighs -1097g (relative to the same volume of air), while 1 cu m of Hydrogen weighs -1186g.
		+	So Hydrogen gives us an extra 89g of payload allowance per litre of gas.
		+	Or, 1.08 cu m of Helium has the same lift as 1 cu m of Hydrogen.

	Helium costs:		Helium costs:
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	** regulator is ~$75 (need to research flow rate)		** regulator is ~$75 (need to research flow rate)

−	Our first mission might require 1-2 cu m of helium, depending on payload mass.	+	Our first mission might require 1-2 cu m of helium, depending on balloon and payload mass.
	Max legal limit (CAR regulations) is < 4 cu m, for a high altitude mission.		Max legal limit (CAR regulations) is < 4 cu m, for a high altitude mission.

2010-03-18T13:20:40Z

Hydrogen and Helium

← Older revision		Revision as of 13:20, 18 March 2010
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	** regulator is ~$75 (need to research flow rate)		** regulator is ~$75 (need to research flow rate)

−	~~A typical~~ mission ~~requires~~ 1 cu m of helium.	+	Our first mission might require 1-2 cu m of helium, depending on payload mass.
−	Max legal limit (CAR regulations) is ~3 cu m, for a high altitude mission.	+	Max legal limit (CAR regulations) is < 4 cu m, for a high altitude mission.

	=How To Guides to Near Space Missions=		=How To Guides to Near Space Missions=

2010-03-18T05:29:05Z

Batteries

← Older revision		Revision as of 05:29, 18 March 2010
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	1.5V, matches standard battery sizes <br>		1.5V, matches standard battery sizes <br>
	Rated for continuous output <br>		Rated for continuous output <br>
		+	Operating Temperature: -40C to 60C <br>
	Highest energy density (more energy per unit mass) <br>		Highest energy density (more energy per unit mass) <br>
	Energizer "L91 Ultimate Lithum" AA size; 14.5g 3200-4300mAh, http://data.energizer.com/PDFs/l91.pdf		Energizer "L91 Ultimate Lithum" AA size; 14.5g 3200-4300mAh, http://data.energizer.com/PDFs/l91.pdf

2010-03-18T05:28:11Z

Batteries

← Older revision		Revision as of 05:28, 18 March 2010
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	1.5V, matches standard battery sizes <br>		1.5V, matches standard battery sizes <br>
	Rated for continuous output <br>		Rated for continuous output <br>
−	~~Higher~~ energy density (more energy per unit mass) <br>	+	Highest energy density (more energy per unit mass) <br>
	Energizer "L91 Ultimate Lithum" AA size; 14.5g 3200-4300mAh, http://data.energizer.com/PDFs/l91.pdf		Energizer "L91 Ultimate Lithum" AA size; 14.5g 3200-4300mAh, http://data.energizer.com/PDFs/l91.pdf
	; Lithium / Thionyl Chloride (Li / SOCl2)		; Lithium / Thionyl Chloride (Li / SOCl2)
−	3.6 V~~, Highest energy density~~, highest operating temperature range (to -55 C) <br>	+	3.6 V, highest operating temperature range (to -55 C) <br>
−	at -55C, energy reduced to 50%	+	at -55C, energy reduced to 50% <br>
		+	expensive, dangerous, hard to get
	; Lithium Polymer		; Lithium Polymer

2010-03-18T05:10:56Z

Batteries

← Older revision		Revision as of 05:10, 18 March 2010
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	Higher energy density (more energy per unit mass) <br>		Higher energy density (more energy per unit mass) <br>
	Energizer "L91 Ultimate Lithum" AA size; 14.5g 3200-4300mAh, http://data.energizer.com/PDFs/l91.pdf		Energizer "L91 Ultimate Lithum" AA size; 14.5g 3200-4300mAh, http://data.energizer.com/PDFs/l91.pdf
−	; Lithium Thionyl Chloride (~~LiSOCl2~~)	+	; Lithium / Thionyl Chloride (Li / SOCl2)
	3.6 V, Highest energy density, highest operating temperature range (to -55 C) <br>		3.6 V, Highest energy density, highest operating temperature range (to -55 C) <br>
	at -55C, energy reduced to 50%		at -55C, energy reduced to 50%

2010-03-18T05:09:31Z

Batteries

← Older revision		Revision as of 05:09, 18 March 2010
Line 60:		Line 60:
	Higher energy density (more energy per unit mass) <br>		Higher energy density (more energy per unit mass) <br>
	Energizer "L91 Ultimate Lithum" AA size; 14.5g 3200-4300mAh, http://data.energizer.com/PDFs/l91.pdf		Energizer "L91 Ultimate Lithum" AA size; 14.5g 3200-4300mAh, http://data.energizer.com/PDFs/l91.pdf
		+	; Lithium Thionyl Chloride (LiSOCl2)
		+	3.6 V, Highest energy density, highest operating temperature range (to -55 C) <br>
		+	at -55C, energy reduced to 50%
	; Lithium Polymer		; Lithium Polymer

2010-03-18T04:57:10Z

Camera/Imaging

← Older revision		Revision as of 04:57, 18 March 2010
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	Drawbacks: cost		Drawbacks: cost
		+
		+	; Camera placement
		+	Some people have used two cameras: one pointed at horizon, for those "curvature of the earth" shots, one pointed down

	= Batteries =		= Batteries =

2010-03-18T04:52:23Z

Batteries

← Older revision		Revision as of 04:52, 18 March 2010
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	; Cylindrical Lithium (Lithium / Iron Disulphide)		; Cylindrical Lithium (Lithium / Iron Disulphide)
	1.5V, matches standard battery sizes <br>		1.5V, matches standard battery sizes <br>
−	Rated for continuous output ~~only~~ <br>	+	Rated for continuous output <br>
		+	Higher energy density (more energy per unit mass) <br>
	Energizer "L91 Ultimate Lithum" AA size; 14.5g 3200-4300mAh, http://data.energizer.com/PDFs/l91.pdf		Energizer "L91 Ultimate Lithum" AA size; 14.5g 3200-4300mAh, http://data.energizer.com/PDFs/l91.pdf
	; Lithium Polymer		; Lithium Polymer

2010-03-18T03:51:54Z

Batteries

← Older revision		Revision as of 03:51, 18 March 2010
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	; Lithium Photo (Lithium / Manganese Dioxide)		; Lithium Photo (Lithium / Manganese Dioxide)
	Non-rechargeable, 3V. <br>		Non-rechargeable, 3V. <br>
		+	Rated for continuous or photoflash output <br>
	Operating Temperature: -40C to 60C <br>		Operating Temperature: -40C to 60C <br>
	Energizer "123" $10 1500mAh 16.5g Specs: http://data.energizer.com/PDFs/123.pdf		Energizer "123" $10 1500mAh 16.5g Specs: http://data.energizer.com/PDFs/123.pdf
	; Cylindrical Lithium (Lithium / Iron Disulphide)		; Cylindrical Lithium (Lithium / Iron Disulphide)
	1.5V, matches standard battery sizes <br>		1.5V, matches standard battery sizes <br>
−	~~designed~~ for continuous output <br>	+	Rated for continuous output only <br>
	Energizer "L91 Ultimate Lithum" AA size; 14.5g 3200-4300mAh, http://data.energizer.com/PDFs/l91.pdf		Energizer "L91 Ultimate Lithum" AA size; 14.5g 3200-4300mAh, http://data.energizer.com/PDFs/l91.pdf
	; Lithium Polymer		; Lithium Polymer

2010-03-18T03:48:18Z

Batteries

← Older revision		Revision as of 03:48, 18 March 2010
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	; Cylindrical Lithium (Lithium / Iron Disulphide)		; Cylindrical Lithium (Lithium / Iron Disulphide)
	1.5V, matches standard battery sizes <br>		1.5V, matches standard battery sizes <br>
		+	designed for continuous output <br>
	Energizer "L91 Ultimate Lithum" AA size; 14.5g 3200-4300mAh, http://data.energizer.com/PDFs/l91.pdf		Energizer "L91 Ultimate Lithum" AA size; 14.5g 3200-4300mAh, http://data.energizer.com/PDFs/l91.pdf
	; Lithium Polymer		; Lithium Polymer