设为首页收藏本站

科技论坛

 找回密码
 注册
查看: 5322|回复: 33

[技术] 水火箭技术之十(转)

[复制链接]
发表于 2013-10-23 08:10:57 | 显示全部楼层 |阅读模式
接至:水火箭技术之九(转)
Recovery System
The recovery technique we are using for G2 is similar to the in-line one we trialled earlier this year with several improvements and in larger scale. This first version is still a prototype so it is a little heavier than we'd like, but good enough for first flights.
How it works:
The parachute is simply packed and placed on top of the flat platform on the base. The nosecone has a spring loaded ejection plate inside it. When you put the nosecone on top of the parachute you compress the ejection plate and then lock down the nosecone on either side with latches.
The nosecone side of the latch is simply a rubber band made from an o-ring so it stretches less. The base latch pivots so that the loop is caught and held down.

水火箭

水火箭


When it's time to release the parachute, the base latch pivots back so that the loops on both sides slip off and the nosecone and parachute are free to fall/slide off. The springs ensure there is enough force to just separate them and the uneven airflow does the rest. The springs should be strong enough to overcome the air pressure on the nose. In the final full recovery system, there will be a separate drogue parachute mounted in the mid section of the rocket, and will be triggered by PK's MAD. This will cause the rocket to come down sideways (more drag) and so when it later comes to deploying the main, the airflow over the nosecone will be sideways and hence even easier to deploy the main parachute.

水火箭

水火箭

Some of the components that make up the deployment mechanism. We didn't end up using the two clear rings in the photo as we changed the design. The fairing for the base is made from two layers of 200gsm fiberglass.

水火箭

水火箭

We made a couple of inserts to go into the Coreflute to support the crank shaft.

水火箭

水火箭

Servo motor with crank and latches. This way we release both latches at the same time.

 楼主| 发表于 2013-10-23 08:13:10 | 显示全部楼层

水火箭

水火箭

Ejection plate components are made from 5mm Corflute.

水火箭

水火箭

The ejection plate locks into a slot inside the nosecone. This allows us to replace the ejection plate for different sized parachutes. We use conical springs which compress down well. (Looking into nosecone on the right)

水火箭

水火箭

The base has a smooth top without any obstructions to allow the parachute to easily slide off in the air flow. There is a small lip around the outside which fits inside the inner edge of the nosecone. This keeps the nosecone from sliding around sideways when in the locked position.


 楼主| 发表于 2013-10-23 08:13:44 | 显示全部楼层

水火箭

水火箭

Looking into the base. The components are spread out around so that we can fit a part of the pressure chamber in the space in the middle.

水火箭

水火箭

Nosecone, base with parachute on top and the ejection plate.

水火箭

水火箭

Latch in the open position.
 楼主| 发表于 2013-10-23 08:14:17 | 显示全部楼层

水火箭

水火箭

Latch in the closed position.

水火箭

水火箭

An O-ring is used as the rubber band to catch onto the latch.

水火箭

水火箭

Overall nosecone and deployment mechanism.

 楼主| 发表于 2013-10-23 08:15:08 | 显示全部楼层

水火箭

水火箭

G2 nosecone ready to be fitted to the test rocket.

水火箭

水火箭

To stop the nosecone from separating from the rest of the rocket it is attached with epoxy and a nylon line.

水火箭

水火箭

John was a great help on the day with rocket prep, launching and retrieval.

 楼主| 发表于 2013-10-23 08:15:57 | 显示全部楼层

水火箭

水火箭

Setting up for first launch.

水火箭

水火箭

The rocket used a 9mm nozzle and 1L of water.

水火箭

水火箭

Launched at 100psi, as the rocket weather cocks into the wind.
 楼主| 发表于 2013-10-23 08:18:41 | 显示全部楼层

水火箭

水火箭

A sequence showing the parachute deployment.

水火箭

水火箭

Recovery crew is on the scene within seconds of landing.

水火箭

水火箭

Setting up for the second flight.
 楼主| 发表于 2013-10-23 08:20:03 | 显示全部楼层

水火箭

水火箭

Rocket starts pitching over soon after take off in the strong wind.

水火箭

水火箭

Up up and away. A good action shot.

水火箭

水火箭

Coming in for a gently landing with a big parachute.
 楼主| 发表于 2013-10-23 08:20:51 | 显示全部楼层

水火箭

水火箭

An all round successful day.

水火箭

水火箭

The fin can is made removable just in case we need to replace the spliced quad that it is attached to.

水火箭

水火箭

As is, it weighs 155 grams.
 楼主| 发表于 2013-10-23 08:21:28 | 显示全部楼层

水火箭

水火箭

The removable fin can attached to the rocket.

水火箭

水火箭

The Polaron G2 rocket is 3m long (~10 feet)

水火箭

水火箭

Breadboarding the ServoTimer II.

您需要登录后才可以回帖 登录 | 注册

本版积分规则

辽公网安备 21100402204006号|科技论坛 ( 辽ICP备07501385号-1   

GMT+8, 2019-2-23 21:47

Powered by tech-domain X3.4 Licensed

© 2001-2017 Comsenz Inc.

快速回复 返回顶部 返回列表