Kerbal Space Program: Complete Beginner-to-Advanced Guide

This guide takes you from your first wobbly rocket to Mun landings, docking, and interplanetary transfers in the original Kerbal Space Program (KSP 1), plus the mods and settings that keep it running well in 2026.

Researched September 2026 — current as of version 1.12.5 (the final patch, January 2023). Live games change; check the linked sources if something differs.

Status check: KSP 1 is finished. Its last major update was 1.12 "On Final Approach" (June 2021), and the last patch was 1.12.5 (January 2023). The sequel, Kerbal Space Program 2, launched in Early Access in February 2023, but its developer Intercept Games was shut down in 2024 and KSP2 has had no substantive updates since mid-2024. For most players, KSP 1 plus mods is still the definitive way to play.

Quick Start

1. Do the tutorials first. Patch 1.12.4 fixed the broken Basic Flight, Go For Orbit, Sub Orbital and construction tutorials, so they are worth your time again.
2. Start in Science mode, not Career. Science gives you a tech tree without the funding stress of Career. Sandbox is great for experimenting once you know the basics.
3. Every stage needs a reason to exist. Drop empty tanks. Dead weight is the number one reason rockets fail to reach orbit.
4. Launch east. Kerbin rotates eastward; launching toward the 90° heading on the navball gives you free speed.
5. Gravity turn early and gently. Start tilting east at roughly 50-100 m/s and follow the prograde marker. Going straight up then turning sideways at 30 km wastes huge amounts of fuel.
6. Orbit is about going sideways fast, not going high. You need about 2,200-2,300 m/s horizontal speed at a 70-80 km altitude; altitude alone does nothing.
7. Use the delta-v readout. Since 1.7 the stock game shows per-stage delta-v (Δv) in the VAB and in flight. Plan with it.
8. Quicksave constantly. F5 to quicksave, hold F9 to quickload. There is no shame in it.
9. Always pack parachutes, and check the staging order. Most "my Kerbal died" stories are a parachute in the wrong stage.
10. Aim for the Mun or Minmus next. Minmus is actually easier to land on (low gravity, flat plains) even though it is further away.

Game Modes

Career tips: accept "test part" and "reach altitude" contracts early, they pay well for little risk. Upgrade the Launch Pad (mass limit), VAB (part count), Tracking Station (to see patched conics and plan maneuvers), and Astronaut Complex / R&D in roughly that order. The Tracking Station and Mission Control upgrades are what unlock maneuver nodes, so do them early.

Essential Controls (default keybinds)

On EVA: WASD to walk, Space to jump, F to grab a ladder, R to toggle the jetpack, Shift/Ctrl to go up/down on the jetpack. Right-click the Kerbal to take a surface sample or crew report.

Rocket Design Fundamentals

The core rules

• Thrust-to-weight ratio (TWR): Your first stage needs a TWR above 1 to leave the pad; 1.3-1.6 is comfortable. Upper stages can be much lower (0.5-1.0 is fine in orbit).
• Specific impulse (Isp): Higher Isp means more Δv per unit of fuel. Sea-level engines (e.g. the RT-10 "Hammer" booster, LV-T45 "Swivel") are for the first stage; vacuum engines (LV-909 "Terrier", LV-N "Nerv") belong on upper stages.
• Center of mass ahead of center of lift/drag: Put fins at the bottom. A rocket that flips in the atmosphere almost always has its drag or fins too far forward.
• Struts and autostrut: Wobbly rockets eat Δv and explode. Use EAS-4 strut connectors, or enable Advanced Tweakables in settings and right-click parts to set Autostrut to "Grandparent" or "Heaviest part".

Staging checklist

• Launch clamps and first engines ignite on stage 1.
• Decouplers fire in the stage after the engines they drop run dry.
• Parachutes should be the very last stage, and only deploy once you've slowed down: the parachute's stage icon shows white when it's safe to open and turns orange (risky) or red (will be torn off) if you're too fast.
• Heat shield under the capsule for any return from orbit.

Delta-v "budget" to keep in mind

These are the community delta-v map values, approximate and assuming efficient flying:

Add 10-20% margin for your first attempts. Returning to Kerbin from the Mun or Minmus is cheap because you can aerobrake in Kerbin's atmosphere.

Getting to Orbit: Step by Step

1. Full throttle (Z), SAS on (T), stage (Space).
2. At ~50-100 m/s, pitch about 5-10° toward east (heading 90).
3. Let the rocket follow its prograde marker down. By 10 km you should be around 45°, by 25-30 km nearly flat.
4. Throttle back if you are going very fast in the thick lower atmosphere (heating and drag).
5. Cut engines when your apoapsis (Ap) reaches ~80 km. Coast out of the atmosphere (70 km).
6. Create a maneuver node at Ap, drag the prograde handle until the periapsis (Pe) rises above 70 km.
7. Start the burn roughly half the estimated burn time before the node. Point at the blue maneuver marker (SAS has a "maneuver" hold mode once your pilot or probe core supports it).

Science: How to Unlock the Tech Tree Fast

• Biomes matter. Each experiment gives different science for each biome and situation (landed, splashed, flying low/high, space low/high). The KSC itself has many tiny biomes (Launch Pad, Runway, VAB, etc.), so a rover driven around the space center is a free early haul.
• Crew Reports, EVA Reports and surface samples need no parts beyond a capsule. EVA reports from high and low space over each biome add up fast.
• Mystery Goo and Materials Bay can only be read once before needing a scientist to reset them, so bring several or bring a scientist.
• Transmit vs recover: Reports such as Crew and EVA Reports transmit for full value, but many experiments (Mystery Goo, Materials Bay, surface samples and others) give noticeably less when transmitted than when the data is physically returned. The right-click results window shows the transmit value, so check it before deciding.
• Minmus is a science farm. Several flat biomes, tiny gravity, and cheap hops between them.
• Mobile Processing Lab (MPL-LG-2) turns data into science over time; park one in orbit around the Mun or Minmus with scientists aboard in mid-game.

Landing on the Mun (or Minmus)

1. From low Kerbin orbit, place a maneuver node on the side of Kerbin opposite where the Mun will be, then pull prograde until you get an "Encounter" marker.
2. At the Mun periapsis, burn retrograde to capture into orbit.
3. Lower your orbit to around 10-20 km (watch for mountains on the Mun; some peaks exceed 7 km).
4. Burn retrograde to kill horizontal speed. Switch the navball to Surface mode and keep the nose on the retrograde marker as you drop.
5. Aim to be under about 5 m/s at touchdown. Landing legs with a wide base help; the Mun's craters are sloped.
6. Plant a flag, take surface samples, grab EVA reports.

Tip: leave a few hundred m/s in reserve for the return. Aerobraking at Kerbin with a periapsis around 30-35 km will slow you down without needing much fuel.

Docking and Rendezvous

1. Launch the target into a round orbit first.
2. Launch the chaser when the target is slightly ahead of the launch site (roughly as it passes overhead), aiming for the same inclination.
3. Set the target as "Target", then adjust your orbit so the closest-approach markers are under 1 km.
4. At closest approach, switch the navball to Target mode and burn toward "target retrograde" until relative velocity is near zero.
5. Point at the target and nudge closer. Keep relative speed low: a few m/s at a distance, under 0.5 m/s in the final metres.
6. Within a few hundred metres, right-click the target's docking port and choose "Set as Target", then right-click your own docking port and choose "Control from here". Use RCS translation (IJKL/HN) to line up and close slowly.

Interplanetary Travel

• Transfer windows: Use the stock Alarm Clock (added in 1.12) or an external calculator (e.g. alexmoon's Launch Window Planner) to find when Duna, Eve, or Jool line up.
• Duna is the classic first planet. Its atmosphere is thin: parachutes help but you still need engines for the final descent.
• Eve is easy to land on and brutal to leave; it needs a dedicated, huge ascent vehicle.
• Jool has no surface; visit its moons (Laythe, Vall, Tylo, Bop, Pol). Laythe has oxygen, so jet engines work there.
• Gravity assists from the Mun or Jool's moons can save significant Δv once you are comfortable with maneuver nodes.
• CommNet: Probes need a signal path to the KSC for full control. Put relay antennas (e.g. RA-2, RA-15, RA-100) in high orbits.

Expansions (DLC)

Breaking Ground's deployable science stations and rotor blades are the more gameplay-relevant pick if you only buy one.

Mods Worth Installing

KSP 1's modding scene is its second life. Use CKAN (the community mod manager) to install and update mods safely.

• Kerbal Engineer Redux or MechJeb 2 — flight data readouts (MechJeb can also autopilot, which is a useful learning aid).
• Kerbal Alarm Clock / Transfer Window Planner — planning helpers (Alarm Clock is stock since 1.12).
• Environmental Visual Enhancements (EVE), Scatterer, Parallax — visual overhauls.
• Kerbal Attachment System / Kerbal Inventory System — EVA construction (much of this is stock since 1.11, which added the EVA inventory and construction mode).
• Kopernicus-based planet packs and Outer Planets Mod — new worlds once you've seen the stock system.
• Realism Overhaul / RP-1 — real solar system and real rockets, a completely different (hard) game.

Keep mods matched to 1.12.x. Mixing old mod versions is the main source of crashes.

Common Mistakes to Avoid

• No parachutes, or parachutes in the wrong stage. Check the staging stack before every launch.
• Vertical ascent to 40 km, then turning. Costs hundreds of m/s. Turn early.
• Forgetting solar panels or batteries on probes. A probe with no electric charge is a dead probe.
• Overbuilding the first stage. Huge lower stages have high TWR but awful mass ratios; balance your stages with the delta-v readout.
• Landing with horizontal speed. You'll tip over. Kill sideways velocity first, then descend.
• Unstrutted payloads. Big fairing payloads often wobble off their decouplers.
• Leaving Kerbals stranded without a plan. Always pack enough Δv to get home, or design a rescue ship.
• Ignoring facility upgrades in Career. The part-count and mass limits are hit quickly.

Advanced Tips

• Suicide burn: Delay the landing burn until the last possible moment for maximum efficiency. Practice on Minmus first; Kerbal Engineer's "suicide burn countdown" helps.
• Oberth effect: Burns are most efficient at high speed, i.e. at periapsis close to a planet. Do interplanetary ejection burns from low orbit.
• Asparagus staging: Feed fuel from outer boosters into central tanks and drop them in pairs for a strong lift stage. Fuel lines point from the donor to the receiver.
• Nerv (LV-N) for deep space: Very high Isp, poor thrust, runs on liquid fuel only. Use LF-only tanks with it.
• Mining (ISRU): The Convert-O-Tron plus drills let you refuel at Minmus or other bodies. Engineer Kerbals improve efficiency.
• Use the Alt+F12 debug menu in sandbox to test landers directly in orbit of their target; don't use it in a save you care about.
• Kerbal experience: Kerbals level up by visiting and landing on new bodies. High-level pilots unlock more SAS modes; engineers repair and mine better; scientists boost data.

FAQ

Is Kerbal Space Program still being updated? No. 1.12.5 (January 2023) was the last patch. The game is complete and stable, and mods keep it fresh.

Should I buy KSP 1 or KSP 2? KSP 1. KSP 2 is an unfinished Early Access game whose studio was closed in 2024, and it has seen no substantive updates since then.

Why won't my rocket turn / why does it flip? Too little control authority (add reaction wheels or gimballing engines), or the center of mass is behind the center of drag (add fins at the bottom, move heavy parts up).

How much delta-v do I need to reach orbit? Roughly 3,400 m/s from the pad to a low Kerbin orbit if you fly an efficient gravity turn.

How do I get more science quickly? Tour the KSC biomes, do EVA reports above many biomes, and land on Minmus, which has several flat, science-rich biomes and very low gravity.

My game crashes with mods. What now? Install mods through CKAN, make sure every mod is marked compatible with 1.12.x, and remove mods one at a time to find the culprit.

Do the DLCs matter? They're optional. Breaking Ground adds robotics and deployable science; Making History adds historical parts and a mission builder.

Sources

• Kerbal Space Program on Steam
• Steam news: KSP 1.12.5, 1.12.4 and 1.12.3 patch notes
• Kerbal Space Program — Wikipedia
• Official KSP Wiki
• CKAN mod manager