How small could a pusher-plate spacecraft be built?

  • Thread starter Arising_uk
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In summary, the conversation discussed the Orion pusher-plate spacecraft from the 1950s, which was shelved due to the nuclear testing treaty. The team behind it had envisioned a large flying house-like craft, but with advancements today, it is possible to build smaller versions. However, the efficiency would decrease with smaller nukes and plates. The conversation also touched on the idea of using these spacecraft in the vacuum and whether that would make a difference in efficiency. It was mentioned that these designs were also considered for Earth-launch, but were ultimately shelved due to the nuclear test-ban treaty.
  • #1
Arising_uk
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Hi All,
Not sure if this is the right section but happy if its moved by mods.

Back in the 50's Dyson and his team came up with the Orion pusher-plate spacecraft and the figures looked like it would work. Apparently it was shelved due to the nuclear testing treaty. Now in the style typical of the day they thought big so the craft would be like a flying house. What I want to know is given the advances today how small could we build a pusher-plate spacecraft ?

Many thanks for any replies.
 
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  • #2
Everything will be possible, but smaller nukes are less efficient and smaller plates capture a smaller fraction of the explosion, so the concept becomes pointless if the spacecraft is not very large.
 
  • #3
Thanks for your reply.

Given it would not be earth-launched but only used in the vacuum would this make a difference to the efficiency?
 
  • #4
Arising_uk said:
Thanks for your reply.

Given it would not be earth-launched but only used in the vacuum would this make a difference to the efficiency?

Were nuclear-explosion-powered pusher-plate designs ever envisioned for Earth-launch?
 
  • #5
Yup! Dyson, et al, had worked out the maths and physics and thought the couple of lives lost to radiation a fair price to pay for such a craft. The reason it was shelved was due to the signing of the nuclear test-ban treaty. Interestingly, and according to his son, the work now appears to be being reclassified as secret by the US govt?
 
  • #6
Project Orion was planned to be launched from ground.

Nuclear weapons don't care about pressure outside, so the conclusion is independent of where you use them.
 

1. How small could a pusher-plate spacecraft be built?

The size of a pusher-plate spacecraft is determined by various factors such as the propulsion system, payload, and structural integrity. However, in theory, it is possible to build a pusher-plate spacecraft as small as a few centimeters in diameter.

2. What is the main principle behind a pusher-plate spacecraft?

The main principle behind a pusher-plate spacecraft is the use of nuclear fusion or fission to generate thrust. This thrust is then transferred to a large pusher-plate, which propels the spacecraft forward.

3. How does the size of the pusher-plate affect the performance of the spacecraft?

The size of the pusher-plate is crucial in determining the performance of the spacecraft. A larger pusher-plate can generate more thrust, allowing the spacecraft to travel at higher speeds and carry a heavier payload. However, a larger pusher-plate also means a heavier spacecraft, which requires more fuel and energy to accelerate.

4. What are the limitations of building a smaller pusher-plate spacecraft?

Building a smaller pusher-plate spacecraft comes with several limitations. One of the main challenges is ensuring the structural integrity of the spacecraft, as smaller sizes mean weaker materials and components. Additionally, a smaller spacecraft may have limited space for fuel and power sources, which can hinder its overall performance.

5. Are there any current projects or research on building a small pusher-plate spacecraft?

Yes, there are ongoing projects and research on building small pusher-plate spacecraft. NASA's Breakthrough Propulsion Physics Project is currently exploring the feasibility of using nuclear fusion or fission for space propulsion, which could potentially lead to the development of smaller pusher-plate spacecraft. Additionally, private companies such as SpaceX and Blue Origin are also investing in research and development of nuclear-powered spacecraft.

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