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[技术] 水火箭技术之四(转)

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发表于 2013-9-25 09:43:21 | 显示全部楼层 |阅读模式
接"水火箭技术之三(转)"

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The night before launch day. Just doing some final heat shrinking on the kitchen stove.

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Any taller and we will have to assemble it outside. Here the rocket is complete ready for its flight.

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Assembling the rocket on the launch pad with the guide rails already installed.

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It takes about 1 hour to set up the launch pad and rocket for its first flight.

 楼主| 发表于 2013-9-25 09:44:33 | 显示全部楼层

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3 ... 2 ....1.... blah blah blah

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We got a good view of booster separation this time.
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The sustainer on its way down snaps a group photo.

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Altimeter data from the first flight.
 楼主| 发表于 2013-9-25 09:45:35 | 显示全部楼层

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Setting up the rocket for the second flight.

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All fueled and ready to go.

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The boosters landed very close together on the ground.

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Apogee photo. The main stage has run out of thrust but sadly remains attached.
 楼主| 发表于 2013-9-25 09:46:11 | 显示全部楼层

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A shot of the main stage parachute deploying.

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Flight #2 altimeter data.

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Our first two pyro rockets built and painted by the boys.

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Kids, where do we fill them up with water?
 楼主| 发表于 2013-9-25 09:46:48 | 显示全部楼层

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First version of the load cell amplifier and logger were both contained in the same box.

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The load cell was at the end of a long cable away from the load cell amplifier.

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On advice we moved the amplifier a lot closer to the load cell and placed it in a metal

box.

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This reduced the noise of the system considerably.
 楼主| 发表于 2013-9-25 09:47:37 | 显示全部楼层

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Here the test stand is on display in the kitchen.

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The amplifier is mounted on top ...

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... with the load cell underneath. The bottle is connected to the load cell here.

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The rocket is supported by three wheels that barely touch it. This allows the rocket to

move with very little friction.
 楼主| 发表于 2013-9-25 09:48:06 | 显示全部楼层

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The wheels can be adjusted out or ...

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... in depending on the size of the rocket.

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First tests set up outside.

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First prototype of the nozzle release head. Pulling the string causes the release head to

drop away.
 楼主| 发表于 2013-9-25 09:48:46 | 显示全部楼层

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Top of the test stand with load cell amplifier on top and load cell connected to the top of

the rocket.

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The laptop and data logger set up nearby. Pressure for the tests was provided by a scuba

tank.

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A video camera recorded each test. A plastic bag protects the electronics from the rain.

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Colour coded water allows us to easily identify the water amount in images and videos.
 楼主| 发表于 2013-9-25 09:49:23 | 显示全部楼层

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A foam test under way. The bricks and towel at the bottom deflect the foam away from us.

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Wires, hoses and strings everywhere.

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Testing a reduced foam mixing chamber to try to reduce the amount of residue foam left in a

rocket.

 楼主| 发表于 2013-9-25 09:49:49 | 显示全部楼层

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Comparing bottle configuration A on the left and configuration B on the right. Blow-through

is quite evident in config A.

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Testing varying concentrations of foam. 30% foam on the left, 1% on the right.

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Testing reduced mixing chamber with small and large air pocket in the chamber.
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