水火箭助推器

助推器, 水火箭, 水火箭助推器为了提高水火箭的动力，今天为大家介绍一款水火箭的助推器。


Theory
The idea behind the drop away boosters is to increase the launch velocity of the main rocket to achieve a greater altitude. When the stored energy in the boosters is spent they automatically separate from the main stage and take away their dead weight and drag.
This rocket configuration is not c**idered a 2 stage rocket as the main stage and boosters all fire at the same time at launch. The technique presented here is one we have used with success on numerous flights.
Basic Concept
The boosters are loosely attached to the main stage and in such a way that they can only move backwards. On launch the boosters' greater thrust allows them to remain in place until they burn out and drag pushes them backwards separating them from the main stage. This way the boosters individually fall off at exactly the right time, irrespective of what the other boosters are doing.

Practical Implementation
Several key aspects must be maintained if this system is to work effectively.
The boosters must produce more thrust than the main stage. This can be achieved with either bigger nozzles, or higher pressure than the main stage. (Use of foam can also be used to reduce and prolong the thrust of the main stage.)
The boosters and main stage need to be released simultaneously.
Each boosters' thrust profile must match the thrust of the other boosters throughout their flight. This means the pressure, water volume and capacity has to be equal for each booster.
Booster Capacity
The booster capacity can be made equal by using identical bottles and c**truction techniques to make them.收藏 分享 评分  回复 引用

订阅 TOP

pilot

• 发短消息
• 加为好友

pilot 当前离线

UID

34334 

帖子

727 

精华

0 

积分

2402 

威望

1019  

金钱

0  

贡献

0 刀 

阅读权限

70 

在线时间

28 小时 

注册时间

2010-11-4 

最后登录

2011-12-2 

金牌会员

2^# 发表于 2010-11-6 05:01 | 只看该作者 Notes
The rocket should be designed so that the thrust phase is much longer for the main stage compared to the boosters. This can be achieved by having the main stage contain more volume and/or having a smaller nozzle. Adding foam to the main stage also prolongs the thrust.
The tubes and pins should not be too short as there will be some amount of vertical movement between the booster and main stage. If they are too short the boosters may separate early due to vibration or buffeting.
The pins, tubes and main stage nozzle need to be made from very strong materials as a lot of force is transferred through these.
C**ider using 2 or more pins on the bottom next to each other to help spread the load.
We use smaller nozzles rather than the full bore nozzles on the boosters as it helps to keep the acceleration down reducing the stress on the tubes and pins.
As the rocket is pressurised there will be a small amount of vertical movement of the boosters as things flex under pressure. This needs to be c**idered in the design so the o-rings continue to provide a good seal.
Another c**ideration needs to be given to the increase in diameter of the main stage and boosters as they are pressurised. If the booster bottle is hard up against the main stage bottle then they will tend to want to push apart. If  a certain amount of give is not incorporated into the launcher nozzle seats, the nozzles may wedge.