Here are some filtering options to select which rockets to look at:
Filter by payload class: Light Medium Heavy Super-Heavy
Filter by crewed flight: Unmanned only Could happen Has done it
Filter by fuel type: Solid Hypergolic Cryogenic
Filter by usage frequency: Regular Rare
Filter by reusability: Expendable Reusable
Filter by commercialization: Govt (exclusive) Govt (commercialized) Private
Filter by country: USA Russia China Europe other
— Rockets included with current filters: · R7/Soyuz · Atlas · Delta · Proton · Long March (old) · | · Ariane · Zenit (Irtysh, Yenisei) · H · Shavit · Pegasus · PSLV, GSLV · START · Minotaur · Rokot · | · Vector · Phantom Express · OmegA · LauncherOne · | · Vulcan · New Glenn · Spectrum · RFA · Blue Whale · New Line · Prime · Dawn · Hapith · Nebula · Haas · Bloostar (Miura) · Skylon —
— Spacecraft and stations included with current filters: · Soyuz · Shenzhou · Dragon · CST-100 Starliner · Orion · Dream Chaser · Next-Generation · Gaganyaan · Starship · Orel · cargo carriers · | · ISS · CLMSS/Tiangong · LOP-G — (Note that only the last two filters, commercialization and country, apply to this group.)
This section is for projects which seemed promising enough so they got written up on this page, but then were abandoned before they ever reached orbit, and also for private ventures which may have reached orbit but never reached profitability, and were therefore shut down. Some of them have good ideas which might make some kind of comeback later in some different form. So far only four rockets have made the transition to this section: Vector Launch (which went bust without finishing a workable vehicle), Boeing’s Phantom Express project for DARPA (which was abandoned as too difficult), Orbital/Northrup’s Omega (which they shelved when the Air Force showed no interest), and most sadly, Virgin Orbit (which actually had four successful launches).
Several other marginal ideas are probably waiting to come over here soon.
— Rockets included with current filters: · Vector · Phantom Express · OmegA · LauncherOne —