As documented on the Aerovelo blog, March and April were two months of ups and downs for the team.
There had been some design changes to the helicopter. Most notable was the fact that the control system was no longer based on the rotor tip canards which made trimming quite difficult. Compare this photo:
with one taken in January:
and then the attempt: the climb up to 3m was very rapid, then whistles indicating that rotor tips were too close to bracing lines, and then the sound of carbon fiber cracking. Just before the cracking, you can see that the string hanging down from the bike was straight, meaning that Todd was in fact at 3 m.
The team handled this devastating setback with grace, equanimity, and an equal determination to rebuild and fly again.
And as recounted on the blog, they rebuilt, and flew once again in April.
In between the March and the April series of tests, Todd and Cam gave this TEDx talk at Western University.
And yet again they rebuilt, and were ready to go earlier this week.
You can see the story on CTV, including footage taken on Sunday, and some earlier crash footage.
There is an excellent article in Popular Mechanics profiling the team, as well as the competing team from the University of Maryland.