Why buy new model rocket engines?

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Discussion Overview

The discussion centers around the reasons for the disposability of model rocket engines after a single use, exploring economic feasibility, safety concerns, and comparisons to larger rocket engines used by companies like SpaceX and NASA. It also touches on the costs associated with rocket launches and the potential for reusable rocket technologies.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Some participants suggest that model rocket engines are designed to be disposable due to safety and economic reasons, as repairing them is not feasible.
  • Others mention that while model rocket engines are single-use, there are reloadable options available.
  • It is noted that real-life rocket engines often sustain significant damage upon landing, which complicates reuse.
  • A participant highlights that the Solid Rocket Boosters used in Space Shuttle missions were designed for recovery and refurbishment, indicating that reuse is possible but requires specific design considerations.
  • Some argue that the current technologies for space launch, such as hypersonic propulsion and rail guns, are not yet practical, leaving traditional rockets as the primary method despite their inefficiencies.
  • One participant shares personal experience with successfully recovering and reusing model rockets, emphasizing that the rockets themselves are designed for recovery while the engines are not.
  • Concerns are raised about the safety of handling rocket fuel, which is closely related to explosives, particularly in the context of children experimenting with it.

Areas of Agreement / Disagreement

Participants express a mix of views regarding the disposability of model rocket engines and the feasibility of reusing larger rocket engines. While some agree on the safety and economic factors, others highlight examples of reusable technologies, indicating that the discussion remains unresolved.

Contextual Notes

There are limitations regarding the assumptions made about the safety and economic implications of rocket engine reuse, as well as the specific design requirements for engines intended for multiple uses.

BonesSheppard
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Hi I was wondering why are model rocket engines disposable after one use? Is it because it is more economically feasible to buy a new model rocket engine than to repair a used one because the process of using a model rocket engine always ruins it? Also, if it is the case that model rocket engines are ruined after one use, is it also the case with larger rockets? For example Falcon 9 or the Atlas-V, does this require companies and agencies such as SpaceX and NASA to rebuild or construct new rocket engines after each launch similar to model rockets? And if the previous answer is yes, are rocket engine rebuilds or reconstructions a primary cost factor for why rocket launches are so expensive?

Sorry for the questions and I appreciate anyone answering them, I was just curious :)
 
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Welcome to pf,
the damage to the engines means that it cannot safely be reused if repared.
i.e. you could, technically refuel a sky-rocket tube, and reuse it. Why is that not routinely done?
 
Welcome to PF!

There are reloadable model rocket engines

http://www.hobbylinc.com/reloadable-model-rocket-engine

Real life rocket engines fall to Earth or the ocean and get seriously damaged on impact or later through salt water. Any of these factors are enough to warrant using new rocket engines to insure a safer launch.
 
The two Solid Rocket Boosters (SRB) attached to each Space Shuttle mission were designed to separate after their fuel was exhausted, after which a parachute was deployed from each booster so that the boosters could be recovered from the Atlantic by a specially equipped vessel. The boosters were then returned to shore and refueled and re-furbished for use on future missions.

http://en.wikipedia.org/wiki/Space_Shuttle#Solid_rocket_boosters

In order to be reused, things like model rocket engines or Solid Rocket Boosters must be designed for multiple uses, which usually means that each unit is heavier than a single-use item.
 
The next best thing we have to get into space is either hypersonic propulsion (very far from practical) or RAM accelerators/rail guns. Neither technology is mature enough to launch anythign appreciable into space. So, we are stuck with inefficient rockets in the sense that they are very heavy and have a small capacity.
 
Model rocket motors were always intended to be low-cost, disposable, safely manufactured for one use by the Estes corporation. The model rocket itself is intended to be a recoverable and reusable item, made from paper and balsa. I have launched, successfully recovered and reused a 4-stage model rocket (4 'A' motors). The first 3 stages were "tumble" recovery, and the 4th by streamer. All my rockets and launches were governed by the safety code of the National Association of Rocketry, of which I was a member.
 
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Rocket fuel is closely related to explosives. You don't want kids experimenting with it.
Model engines are made very carefully.

See "October Sky" , it's about home made rockets. And it is a darn good movie.

http://en.wikipedia.org/wiki/October_Sky
 

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