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To start up your fancy new warp drive you need to
- be able to generate lots of electricity for the Exotic Matter conversion that is the fuel of your warp drive: A decent sized nuclear reactor or similar is recommended, though in a pinch lots of Gigantor solar panels will do.
- be far enough away from the nearest source of gravity: you need to be at an altitude equal or higher than the radius of the body you're orbiting. For example, on Kerbin you need to be at least 600 km above the surface. It doesn't have to be a circular orbit though.
- make sure all of your ship fits in the warp bubble, or any parts sticking out will explode. For the 0.625m drive, the bubble has a radius of only 5m, whereas the 2.5m drive has a bubble radius of 20m. You can enable the bubble guide in the VAB to see how big it is.
Once you have taken care of the above points, you can start your warp drive! But first cut your throttle to be safe. Accidentally going somewhere at faster than the speed of light can take you very far away.
For journeys around a planet, it's a good idea to lower the thrust limiter to something like 30%. At full throttle you'd be out of the Kerbin's SOI in a fraction of a second! So increase that throttle slowly and carefully. Your warp speed increases exponentially with throttle.
Make sure you stay far enough away from any planets or moons on the way or the warp drive will deactivate.
And unless you have a huge nuclear reactor that can
When you design your warp ship, the warp drive has an important option that determines how it works: the conservation mode.
This is needed because the warp drive just moves you through space. Unlike for example Hohmann transfers, your velocity at intercept will not be close to the target velocity. If you're note careful, you could need a delta-V of 10k+ m/s to achieve orbit.
This is because
In this mode, the warp drive simply moves your through space without changing your velocity at all. Your prograde vector will keep pointing in the same direction and the prograde speed will not change, except during an SOI transition as usual.