KerbalX

My first Seaplane, based on my C7 Cormorant SSTO, but with added hydrofoils.
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37 tons, 3 seats, docking port, 2 nukes, 1 rapier, 2 junos, no oxidizer.
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Action Groups
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1 Nukes on/off
2 (Hydro)Flaps up/down
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Taking off from the Water
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Deploy hydro-flaps with action group 2. I’ve had trouble with some surfaces deploying in the wrong direction so I recommend checking this as soon as you spawn on Runway.
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Get going as fast as you can in the water on the Rapier and Junos. It’ll probably only make it to 13m/s or so, but this should at least get the hull planing.

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Then use action group 1 to get a burst from the nukes, to accelerate to 29 m/s. After that water resistance will continue to fall as you get faster till it flies itself off. Retract flaps once safely airborne.
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Getting to Orbit
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Climb subsonic to 10-13km, then reduce AoA so nose only a couple of degrees above horizon until accelerated to 440 m/s.
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Make your speedrun at 21500M altitude. Keep reducing nose up trim to just 1.5AoA, to stop it climbing. You should be able to reach a little over 1400 m/s. After that, turn the nukes on and pitch to 4 or 5 degree AoA. Do your best to hold that AoA until your AP has gone over 70km.

Details

• Type: SPH
• Class: spaceplane
• Part Count: 73
• Pure Stock