My Dart Heavy 1

Altaïr

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#3
Nice rocket :)

But you may prefer to use a Frontier engine for the second stage. It's less powerful, but more efficient, meaning it will help you to save fuel, and you'll go further with the same fuel quantity.
 

Altaïr

Space Stig, Master of gravity
Staff member
Head Moderator
Team Kolibri
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TEAM HAWK
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Under Pressure
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#11
wdym Thrust / Weight: O.6
It's because he added 2 columns of fuel tanks next to the rocket. They are accounted for in the TWR calculation, but they won't lift-off in practice, you're supposed to detach them.