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- Type: VAB
- Class: lifter
- Part Count: 112
- Pure Stock
The HTHF-21 is the big brother of the HTHF-5 engine and the ones before it. It’s a long range vacuum engine ready to be merged onto a craft and do station deliveries, fuel deliveries, getting a crew somewhere, or of course doing scientific stuff.
And how could you not love it from the amazing thumbnail?
I have edited the engine and it looks a lot better than in the image above now.
Built in the VAB in KSP version 1.3.0.
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