Arcas K-K-M

The Arcas K-K-M is the second rocket in the series of Arcas rockets to have the Actaeon kickstage added.

The Arcas rockets use 4 Ceres K1 staged combustion kerolox engines on the first stage.

The K-K variant uses 2 Iris K-1V electric pump-fed engines on its upper stage, and an Actaeon kickstage which runs on an electric pump-fed Caelus E2 methalox engine and can take 9.85 tonnes to GEO.

Despite the K-K having a higher payload capacity than the K-S variant, the payload to GEO remains the same due to the fact that a higher payload would require a redesign of the kickstage.

The core and fairing diameter is 3.5m and the upper stage is 3m in diameter, the vehicle's total height is 40.4m.