How Hard Tech Startups Grow: From LOIs to Production

Key Takeaways

• Physical proof drives capital: Early-stage hard tech needs tangible milestones—a prototype, motor, or model—to attract investment and customer interest
• Customer validation comes first: Letters of intent from major airlines (SAS, Embraer, Wideroe) validated market demand before full-scale production
• Unexpected channels matter: Major customers can arrive through unconventional routes—even overlooked emails in the spam folder
• Design philosophy affects adoption: Conventional aesthetics (mimicking existing turboprops) can appeal to buyers more than futuristic concepts
• Milestone-based progression: Each stage of development—from 3D model to 400-kW motor to pre-orders—unlocked the next level of capital and opportunity

The Power of Physical Milestones

Hard tech founders face a unique challenge: capital requires proof, but proof requires capital. The solution is showing something material at every stage.

Arriving at YC Demo Day with only a 3D-printed model might sound insufficient, but it communicated the vision clearly enough to secure initial letters of intent from three major airlines. That physical object, however simple, made the concept concrete. Once those LOIs were in hand, the team could justify building the next milestone—a 400-kilowatt electric motor the size of a jet engine.

This progressive approach works because investors and customers can see, touch, and evaluate tangible progress. A prototype isn't a promise; it's proof.

How Pre-Orders Become Capital

The 400-kW motor didn't just impress—it attracted pre-orders from United Airlines, a major validation that turned customer interest into committed revenue. This shift from early interest to actual orders fundamentally changed the fundraising conversation.

When founders can say "we have pre-orders from a Fortune 500 airline," capital follows naturally. The motor became the bridge between speculation and production reality, proving the technology worked at a meaningful scale.

Finding Customers in Unexpected Places

One of the most instructive moments came through pure chance: United Airlines contacted the team via an inbound email to their general info address. That email landed in the spam folder until a team member spotted it while cleaning up.

This encounter reveals an important truth—sometimes your biggest customer is already reaching out; you just need to notice. Once the team brought United in to see the motor in person, the vision became immediately clear. The physical object did the selling; no pitch was necessary.

Design Philosophy: Conventional Over Futuristic

Most electric aircraft startups embrace a bold, futuristic aesthetic. Heart Aerospace took the opposite approach intentionally.

Rather than designing a "sports car," the team built something that looks like the turboprops it's replacing. The conventional appearance masks advanced technology underneath—hiding the "Superman cape" where it matters: in performance and capability, not styling.

This strategy works because buyers in regulated industries like aviation often prefer evolutionary change over revolutionary disruption. A plane that looks familiar but operates differently is easier to adopt than something that looks alien and performs differently.

Conclusion

For hard tech founders, the path to scale isn't about building in stealth until perfection. It's about moving from milestone to milestone, with each one more substantial than the last—from a model to a motor to production aircraft. Physical proof attracts customers, customers attract capital, and capital enables the next milestone. Start with what you can show today, not what you promise tomorrow.

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Original source: Hard Tech Startups Are Built One Milestone at a Time

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