Here, I gave an overview of the accursed planet Bruticus, and here I provide some numbers to go with that overview, on the planet itself, its moons, and some statistics on the natives’ biological spacecraft that lend themselves to the planet’s bad reputation by Kai’Siri nationals.
Bruticus itself has a mass of 5.98 x 10^27 kilograms, a bit over 1000 the mass of the Earth, a diameter of 85,174 kilometers, and a polar gravity of 22.43 times that of Earth’s while the centrifugal force of its rapid rotation reduces the gravity toward the equatorial regions to a minimum of 2.2 times Earth’s. This means that the day/night cycles are very short, and makes rocket-propelled spacecraft (see below) easiest to launch from the equator. The extremes of gravity by latitude result in significant differences thereof in adaptations to local life-forms and in their ecologies.
There are also the five large moons of the planet from the innermost to outermost:
Moon 1. Mass: 8.348 x 10^22 kilograms; Diameter: 3470 km; Gravity: 0.1887 Gs
Moon 2. Mass: 1.4351 x 10^23 kilograms; Diameter: 4200 km; Gravity: 0.22 Gs
Moon 3. Mass: 1.48 x 10^23 kilograms; Diameter: 5262 km; Gravity: 0.135 Gs
Moon 4. Mass: 6.28 x 10^23 kilograms; Diameter: 6625 km; Gravity: 0.39 Gs
Moon 5. Mass: 3.285 x 10^21 kilograms; Diameter: 914 km; Gravity: 0.107 Gs
The massive spacecraft beings stand, both stages (a mated pair, always nearing the end of the species’ life-cycle) at 150 meters tall with 17,600 tonnes full mass, with the sometimes-crewed payload-organism massing about 550 tonnes. The craft has a delta-V of 20794.42 for the first stage used in reaching low planetary orbit, with the second stage massing at 2,200 tonnes fully fueled with payload, its delta-V being 13,862 for reaching near-lunar orbit, whereupon it may take advantage of the Lagrange points and the slingshot effects the moons afford to carry the payload to the rest of the outer system.
The takeoff fuel of the organisms is a powder of crystalized chlorine gathered by biological processes forcibly mixed with powdered lithium hydride in the burn chamber, also part of the creature’s skeletal frame used for support in Bruticus’ gravity.
Once the upper stage expends its fuel, it dies, after having fertilized the first stage which dies prior to second-stage burn, its spores released drifting into Bruticus’ atmosphere to germinate and grow.
The craft organisms are plant analogs with protein-based tissues and certain cephalopod characteristics, like tentacles used for mobility and for linking the stages and payload for takeoff, almost like giant, mobile, rocket-powered fungi.
Carefully bred by their masters, the creatures are masterpieces of bioengineering, suited mainly for in-system travel, with only a very few used to launch payloads toward or beyond the edge of the system, mostly uncrewed probes and navigation beacons.