[JBW1949]

ARCA has gone from race cars to rockets?????

[BenLurkin]

“Trailer”

https://www.youtube.com/watch?v=30LBEyFdWmE&feature=youtu.be

[Darksheare]

“Relying on single stage and single Executor engine, this rocket will small satellites into orbit.”

Englass fhail.
Will small satellites in orbit?
Okay..

[Purdue77]

"The SSTO may also offer the possibility to launch from an inland spaceport, as there are no first stages that will fall on the ground after burnout."

Once it is in orbit and it has delivered its payload, the only place for it to go is back to earth.

"This opens new frontiers for exploration of the Solar System as the rocket can be refueled in-orbit and re-utilize its aerospike engine thus eliminating the need for additional upper stages."

They eschew the need for extra stages and then decide that an additional vehicle is necessary for refueling. What good is that if no refueling vehicle is available. Also not very good for higher orbits or polar orbits.

[Ozark Tom]

Usually the plug nozzle, what they call an aerospike, is more truncated. Usually cooling of the extremity is an issue.