Please look in the FAQ and stop asking the DEVs Questions when you can find the answers in the FAQ page. If not there look in these links below.
Engines
Mage I
Pixie engine
Apex engne
Other building materials
Command Pod
Rotators
Parachutes
Pistons
Landing Legs
Fuselages
Solar Panels
Docking Port
Wings
Fairings
Resizable Wheels
Other ingame features.
Build Sharing
Planets
Photo Library
Visual Effects
Other
Before you ask questions please check the FAQS or one of the above links.
Other handy links
Suggestions
Official Unofficial FAQ
Official Unofficial FAQ Vol. 2
RailfanEthan's Rant
Trailer Breakdown
System Requirements
Steam Page
@Bmcclory