: The classic 1995 PC simulation game Apache Longbow is available for free download at the Internet Archive as abandonware.

: Sites like MyPaperCraft offer free downloadable PDF templates for building a paper model of the AH-64D.

: You can find R/C plans and technical blueprints for free at AeroFred .

🚀 : Whether you are writing a research paper or building a papercraft model, use DTIC for technical facts and MyPaperCraft for physical templates. If you'd like, I can help you: