What does Schumacher Rockets do in AoE3?

Ships 1 Rocket; Makes researchable: Imperial Rockets; Rocket: train time −25%, hit points −50%. The game says: "Sends 1 Imperial Rocket and enables them in Factories instead of Cannons. Rockets spawn faster at the expense of lower hitpoints."

Home City card

Schumacher Rockets

Schumacher Rockets (tech ID DEHCSchumacherRockets) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 1 civilization, sent from the Industrial Age. Effect: Ships 1 Rocket; Makes researchable: Imperial Rockets; Rocket: train time −25%, hit points −50%. It hands over about 600 resources' worth.

Quick answers (3)

Which civilizations have the Schumacher Rockets card?: Danes.
What does Schumacher Rockets do in AoE3?: Ships 1 Rocket; Makes researchable: Imperial Rockets; Rocket: train time −25%, hit points −50%. The game says: "Sends 1 Imperial Rocket and enables them in Factories instead of Cannons. Rockets spawn faster at the expense of lower hitpoints."
What is the tech ID of Schumacher Rockets?: DEHCSchumacherRockets.

Sends 1 Imperial Rocket and enables them in Factories instead of Cannons. Rockets spawn faster at the expense of lower hitpoints.

What it does

Ships 1 Rocket(unit)
Makes researchable: Imperial Rockets
Rocket: train time −25%, hit points −50%

6 further effects (interface, visuals or AI) not listed.

What it hands over

1 × Rocket600 each

Total ≈ 600 resources — units at their train cost, crates and animals at what they hold.

Cost: 1
Sent from: IV
Times it can be sent: 1
Game ID: DEHCSchumacherRockets

In these decks

DanesIV×1

Source: techtreey.xml and the Home City files, AoE3: DE 100.19.18309 (build 25040513).