Yeah certification is one of our biggest risks. Luckily for us there are already a few other companies that are breaking the ground here and the certification path is becoming less opaque. There is a lot of scrutiny for new propulsion types but the certification process is largely the same - its more that we don't have the luxury of experience and being able to point to "similarity" to show compliance. We are budgeting ~$50M for our 15-seat retrofit product development and cert and a bit more than 10X that for the 50 seat product.

Are you able to use an "experimental" aircraft/designation to do flight tests in parallel waiting for approvals?

Exactly! We will be flying "Bonnie" our Beechcraft Bonanza on an experimental ticket next year. We will then do the same for each of other programs. This helps us get the hours and data to support our certification process.

Awesome, thanks for the info! Very exciting project, good luck!