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General Electric HTRE-3 Nuclear Jet Engine

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11–20 of 71 posts

Re: General Electric HTRE-3 Nuclear Jet Engine

#11
post #8

Earlier quoted context omitted.

The RTGs on the Voyager spacecraft weigh 38kg. They initially produced 160 Watts. That sounds like a no-go to me.

It might not have great power density but boy does that thing keep going for decades

Full power for ~10,000 years, give or take.

Re: General Electric HTRE-3 Nuclear Jet Engine

#12
post #8

Earlier quoted context omitted.

It might not have great power density but boy does that thing keep going for decades

Full power for ~10,000 years, give or take.

No. You're thinking of nuclear waste. Voyager's RTG lasted "only" a few decades.

Re: General Electric HTRE-3 Nuclear Jet Engine

#13

Here's another fun one: https://en.wikipedia.org/wiki/Supersonic_Low_Altitude_Missil... An unmanned nuclear-powered ramjet designed to spew warheads, with a predicted range of 116,000 kilometers.

And for scale that’s circling the earth three times.

Re: General Electric HTRE-3 Nuclear Jet Engine

#14

Earlier quoted context omitted.

Full power for ~10,000 years, give or take.

No. You're thinking of nuclear waste. Voyager's RTG lasted "only" a few decades.

Design choice, not an inherent constraint. Plutonium has a half life in excess of 25000 years

Re: General Electric HTRE-3 Nuclear Jet Engine

#16
post #3

I wonder if a RTG could produce enough to run an electric quad or optocopter? For certain applications if unmanned you wouldn’t really need to worry about shielding. I wonder how long those motors can run continuously?

The RTGs on the Voyager spacecraft weigh 38kg. They initially produced 160 Watts. That sounds like a no-go to me.

I think you need 1 hp per 10-15 lbs of weight to fly. I think that's around 130 W/kg. I checked a piper cub is something like 100.

Other hand Pu-238 produces 570 W/kg. A piper cub with it's 48kw engine would need 87kg of Pu-238 to produce the same energy.

I looked up the cost, $1968/g. So 48kw would cost $171 million.

Interesting idea but doubt.

Re: General Electric HTRE-3 Nuclear Jet Engine

#18

Here's another fun one: https://en.wikipedia.org/wiki/Supersonic_Low_Altitude_Missil... An unmanned nuclear-powered ramjet designed to spew warheads, with a predicted range of 116,000 kilometers.

And for scale that’s circling the earth three times.

Well, that's the best setup for the roadrunner ACME missile launcher joke I've ever heard.

Re: General Electric HTRE-3 Nuclear Jet Engine

#19
post #3

I wonder if a RTG could produce enough to run an electric quad or optocopter? For certain applications if unmanned you wouldn’t really need to worry about shielding. I wonder how long those motors can run continuously?

The RTGs on the Voyager spacecraft weigh 38kg. They initially produced 160 Watts. That sounds like a no-go to me.

I wish Toshiba would have actually sold that RTG laptop battery. Imagine never having to charge!

Re: General Electric HTRE-3 Nuclear Jet Engine

#20

Here's another fun one: https://en.wikipedia.org/wiki/Supersonic_Low_Altitude_Missil... An unmanned nuclear-powered ramjet designed to spew warheads, with a predicted range of 116,000 kilometers.

And for scale that’s circling the earth three times.

...at ground level.
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