2019 Launch Reports - Revision history

Danno at 19:20, 30 November 2021

2021-11-30T19:20:20Z

← Older revision		Revision as of 14:20, 30 November 2021
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	===Kestrel, K260===		===[[Kestrel]], K260===

	First flight of my first minimum-diameter rocket, which I had intended to fly at the previous year's Airfest. Weather on Saturday was too cloudy to fly, so I only got one of my two planned flights in (the other motor was a K660). Kestrel carried an Altus Metrum TeleMega. I used a launch tower constructed by Dan Welling.		First flight of my first minimum-diameter rocket, which I had intended to fly at the previous year's Airfest. Weather on Saturday was too cloudy to fly, so I only got one of my two planned flights in (the other motor was a K660). Kestrel carried an Altus Metrum TeleMega. I used a launch tower constructed by Dan Welling.

	{\| class="wikitable"		{\| class="wikitable"
	\|+Wildman Mach Two (modified) “Kestrel” flight #1:		\|+Wildman Mach Two (modified) [[Kestrel\|“Kestrel”]] flight #1:
	\|-		\|-
	\|Launch time:\|\|Sunday, September 1, 2019, 9:45 am		\|Launch time:\|\|Sunday, September 1, 2019, 9:45 am

Danno at 20:12, 1 June 2021

2021-06-01T20:12:27Z

← Older revision		Revision as of 15:12, 1 June 2021
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	\|Motor:\|\|[http://www.pro38.com/products/pro38/motor/MotorData.php?prodid=700J400-16A Cesaroni Pro38 700J400-16A Smoky Sam]		\|Motor:\|\|[http://www.pro38.com/products/pro38/motor/MotorData.php?prodid=700J400-16A Cesaroni Pro38 700J400-16A Smoky Sam]
	\|-		\|-
	\|Max altitude:\|\|~~n feet AGL~~ (~~AltimeterTwo, accelerometer~~)		\|Max altitude:\|\|(not recorded)
	\|-		\|-
	\|Max velocity:\|\|~~n ft/sec~~ (~~162 mph) (AltimeterTwo, accelerometer~~)		\|Max velocity:\|\|(not recorded)
	\|-		\|-
	\|Max acceleration:\|\|~~n G~~ (~~AltimeterTwo, accelerometer~~)		\|Max acceleration:\|\|(not recorded)
	\|}		\|}

	[[Category:Launch Reports]]		[[Category:Launch Reports]]

Danno at 01:00, 2 February 2021

2021-02-02T01:00:47Z

← Older revision		Revision as of 20:00, 1 February 2021
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	\|Max acceleration:\|\|n G (AltimeterTwo, accelerometer)		\|Max acceleration:\|\|n G (AltimeterTwo, accelerometer)
	\|}		\|}

			[[Category:Launch Reports]]

Danno: /* Jiminy Cricket, I242 */

2021-01-30T21:59:13Z

Jiminy Cricket, I242

← Older revision		Revision as of 16:59, 30 January 2021
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	}}		}}

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	===Kestrel, K260===		===Kestrel, K260===

Danno at 21:58, 30 January 2021

2021-01-30T21:58:40Z

← Older revision		Revision as of 16:58, 30 January 2021
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	File:Kestrel-ldrs38-graph.png\|Graph of Kestrel's flight profile.\|alt=Graph of Kestrel's flight profile.		File:Kestrel-ldrs38-graph.png\|Graph of Kestrel's flight profile.\|alt=Graph of Kestrel's flight profile.
	</gallery>		</gallery>

			[[File:Kestrel-coning.png\|frame\|alt=Flight data showing coning of Kestrel during flight on a K260 motor (note oscillation of measured pitch, green line).\|Flight data showing coning of Kestrel during flight on a K260 motor (note oscillation of measured pitch, green line).]]

	'''2021 Update:''' In a presentation I heard at NARCON 2021, mention was made of high-performance rockets using three fins being more susceptible to [https://www.rocketreviews.com/coning-180703140820.html coning] than those with four fins. The [https://wildmanrocketry.com/collections/wildman-expedition-series/products/mach-2-rocket Wildman Mach Two] kit from which Kestrel was built came with four fins. I simulated it in OpenRocket and found that it would have plenty of stability margin with only three fins, so I emailed Tim and asked him if there was any reason not to build it with three. He said he didn't know, only that it was designed with four. So, I went ahead and built Kestrel with three fins, reasoning that less drag was good.		'''2021 Update:''' In a presentation I heard at NARCON 2021, mention was made of high-performance rockets using three fins being more susceptible to [https://www.rocketreviews.com/coning-180703140820.html coning] than those with four fins. The [https://wildmanrocketry.com/collections/wildman-expedition-series/products/mach-2-rocket Wildman Mach Two] kit from which Kestrel was built came with four fins. I simulated it in OpenRocket and found that it would have plenty of stability margin with only three fins, so I emailed Tim and asked him if there was any reason not to build it with three. He said he didn't know, only that it was designed with four. So, I went ahead and built Kestrel with three fins, reasoning that less drag was good.
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	After hearing about the coning issue, I realized that I had no idea whether Kestrel had coned on this flight or not. So I loaded up the flight data, and...		After hearing about the coning issue, I realized that I had no idea whether Kestrel had coned on this flight or not. So I loaded up the flight data, and...

	~~[[File:Kestrel-coning~~.png\|frame\|alt=Flight data showing coning of Kestrel during flight on a K260 motor (note oscillation of measured pitch, green line).\|Flight data showing coning of Kestrel during flight on a K260 motor (note oscillation of measured pitch, green line).]]		D'oh.

	~~D'oh.~~		<br clear=all>

	===Marvin the Martian's Space Oddity, Research O===		===Marvin the Martian's Space Oddity, Research O===

Danno: /* Kestrel, K260 */

2021-01-30T21:57:10Z

Kestrel, K260

← Older revision		Revision as of 16:57, 30 January 2021
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	After hearing about the coning issue, I realized that I had no idea whether Kestrel had coned on this flight or not. So I loaded up the flight data, and...		After hearing about the coning issue, I realized that I had no idea whether Kestrel had coned on this flight or not. So I loaded up the flight data, and...

	[[File:Kestrel-coning.png\|alt=Flight data showing coning of Kestrel during flight on a K260 motor (note oscillation of measured pitch, green line).\|Flight data showing coning of Kestrel during flight on a K260 motor (note oscillation of measured pitch, green line).]]		[[File:Kestrel-coning.png\|frame\|alt=Flight data showing coning of Kestrel during flight on a K260 motor (note oscillation of measured pitch, green line).\|Flight data showing coning of Kestrel during flight on a K260 motor (note oscillation of measured pitch, green line).]]

	D'oh.		D'oh.

Danno: /* Kestrel, K260 */

2021-01-30T21:52:22Z

Kestrel, K260

← Older revision		Revision as of 16:52, 30 January 2021
Line 88:		Line 88:
	After hearing about the coning issue, I realized that I had no idea whether Kestrel had coned on this flight or not. So I loaded up the flight data, and...		After hearing about the coning issue, I realized that I had no idea whether Kestrel had coned on this flight or not. So I loaded up the flight data, and...

	[File:Kestrel-coning.png\|alt=Flight data showing coning of Kestrel during flight on a K260 motor (note oscillation of measured pitch, green line).\|Flight data showing coning of Kestrel during flight on a K260 motor (note oscillation of measured pitch, green line).]		[[File:Kestrel-coning.png\|alt=Flight data showing coning of Kestrel during flight on a K260 motor (note oscillation of measured pitch, green line).\|Flight data showing coning of Kestrel during flight on a K260 motor (note oscillation of measured pitch, green line).]]

	D'oh.		D'oh.

Danno: /* Kestrel, K260 */

2021-01-30T21:51:19Z

Kestrel, K260

← Older revision		Revision as of 16:51, 30 January 2021
Line 83:		Line 83:
	File:Kestrel-ldrs38-graph.png\|Graph of Kestrel's flight profile.\|alt=Graph of Kestrel's flight profile.		File:Kestrel-ldrs38-graph.png\|Graph of Kestrel's flight profile.\|alt=Graph of Kestrel's flight profile.
	</gallery>		</gallery>

			'''2021 Update:''' In a presentation I heard at NARCON 2021, mention was made of high-performance rockets using three fins being more susceptible to [https://www.rocketreviews.com/coning-180703140820.html coning] than those with four fins. The [https://wildmanrocketry.com/collections/wildman-expedition-series/products/mach-2-rocket Wildman Mach Two] kit from which Kestrel was built came with four fins. I simulated it in OpenRocket and found that it would have plenty of stability margin with only three fins, so I emailed Tim and asked him if there was any reason not to build it with three. He said he didn't know, only that it was designed with four. So, I went ahead and built Kestrel with three fins, reasoning that less drag was good.

			After hearing about the coning issue, I realized that I had no idea whether Kestrel had coned on this flight or not. So I loaded up the flight data, and...

			[File:Kestrel-coning.png\|alt=Flight data showing coning of Kestrel during flight on a K260 motor (note oscillation of measured pitch, green line).\|Flight data showing coning of Kestrel during flight on a K260 motor (note oscillation of measured pitch, green line).]

			D'oh.

	===Marvin the Martian's Space Oddity, Research O===		===Marvin the Martian's Space Oddity, Research O===

Danno at 20:21, 26 January 2021

2021-01-26T20:21:04Z

← Older revision		Revision as of 15:21, 26 January 2021
Line 69:		Line 69:
	Kestrel landed in a plowed field about 1/4 mile NE of the intersection of Dixon Rd. and Highway 44, about a mile southeast of the launch pad. Easy recovery and there was no damage to the rocket. All recovery deployed, but the primary main charge did not fire. The TeleMega stopped acquiring data 270 seconds after launch, which was also about the time the main parachute should have deployed. I later discovered that one of the electrical connections to the magnetic power switch, held by a #4 machine screw, was loose. Earlier in the trip, the computer had mysteriously switched on while the av-bay was stored in a bin, and I think this loose connection was the reason for both. Lessons: tighten the crap out of all screws which serve as electrical connections, and don't ignore things that mysteriously turn themselves on or off.		Kestrel landed in a plowed field about 1/4 mile NE of the intersection of Dixon Rd. and Highway 44, about a mile southeast of the launch pad. Easy recovery and there was no damage to the rocket. All recovery deployed, but the primary main charge did not fire. The TeleMega stopped acquiring data 270 seconds after launch, which was also about the time the main parachute should have deployed. I later discovered that one of the electrical connections to the magnetic power switch, held by a #4 machine screw, was loose. Earlier in the trip, the computer had mysteriously switched on while the av-bay was stored in a bin, and I think this loose connection was the reason for both. Lessons: tighten the crap out of all screws which serve as electrical connections, and don't ignore things that mysteriously turn themselves on or off.

	[https://danno.org/RocketBlogFiles/ldrs38-2019/2019-09-01-serial-4266-flight-0001.kml GPS track] (viewable with [https://www.google.com/earth/ Google Earth])		[https://danno.org/RocketBlogFiles/data/ldrs38-2019/2019-09-01-serial-4266-flight-0001.kml GPS track] (viewable with [https://www.google.com/earth/ Google Earth])

	[https://danno.org/RocketBlogFiles/ldrs38-2019/2019-09-01-serial-4266-flight-0001.eeprom Raw flight data] (viewable with [https://altusmetrum.org/AltOS/ AltOS])		[https://danno.org/RocketBlogFiles/data/ldrs38-2019/2019-09-01-serial-4266-flight-0001.eeprom Raw flight data] (viewable with [https://altusmetrum.org/AltOS/ AltOS])

	[https://danno.org/RocketBlogFiles/ldrs38-2019/2019-09-01-serial-4266-flight-0001.csv Raw flight data] (CSV)		[https://danno.org/RocketBlogFiles/data/ldrs38-2019/2019-09-01-serial-4266-flight-0001.csv Raw flight data] (CSV)

	<gallery mode="slideshow">		<gallery mode="slideshow">

Danno: Danno moved page 2019 to 2019 Launch Reports

2021-01-26T16:41:09Z

Danno moved page 2019 to 2019 Launch Reports

← Older revision	Revision as of 11:41, 26 January 2021
(No difference)