this is a much more refined version of my original N4K arrowhead, the RP6-N3 Arrowhead! i found that using rapiers instead saved weight and delta v. Also I cut the crap from it and made it more streamlined, which allows it to get almost 1500 m/s in atmo using airbreathing mode!
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After that mission it still had something 800m/s Dv left. a landing and return from duna could be done!
Stats:
Parts: 94
Wet/dry mass in metric tons: 63.2/34.5
Length: 19.7m
Width: 8.9m
Height: 3.9m
Max recorded speed in airbreathing mode: Mach 4.4
Delta V in orbit after being fully refueled with liquid fuel: 3700+
Actiongroups: 1. turn on/off rapiers 2. rapier mode 3. turn on/off nukes 4. ladder
Ascent profile:
take off at 45 degrees and remain here until 5km up, then pitch down to 30, then at 10km pitch down to 20, then the cooking phase begins! nothing explodes at all though. and finallly at 15km pitch down to 10. dont pitch now you can just let it accelerate to max speed. you will get approximatley 1490 ish m/s at 24km up, then you can switch rapier mode and turn on nukes. there's enough oxidiser to get the apoapsis almost to space then the nukes will do the rest. set desired apoapsis, coast, circularise and then do your thing ;) i reccomend refueling it in a low kerbin orbit and then taking it for a trip to wherever you think it could go. (confirmed mun and minmus capable but with that amount of Dv im sure it could do more)
have fun!
