The ship parts have the following weights.

Dolphins Main Engine: 20
Eternal Fuel Dynamo: 40
Shock Absorber: 30
Whimsical Radar: 20
Extraordinary bolt: 30
Nova Blaster: 30
Space float: 25
Automatic Gear: 15
Omega Stabilizer: 30
Gravity Jumper: 25
#1 Ionium Jet: 15
Position Generator: 20
Sagittarius: 20
Radiation Canopy: 30
Geiger Counter: 15
Anti-Dioxin Filters: 40
Libra: 15
Analog Computer: 20
Guard Satellite: 20
Massage Machine: 30
Gluon Drive: 50
Interstellar Radio: 20
Zirconium Rotor: 30
Pilot's Seat: 25
Repair Type Volt: 20
UV Lamp: 10
Bowsprite: 30
Chronos Reactor: 20
#2 Ionium jet: 15
Secret Safe: 40