I heard a lot about SpaceX reusing the fairings from the Falcon 9. Do they/ are they planning to do the same for Falcon Heavy?
The evidence points to:
SpaceX recovers Falcon Heavy fairings if they can - the first fairing caught as part of their "dry recovery program" was a Falcon Heavy fairing from the third FH flight, while the fairings were recovered "wet" from the second FH flight
SpaceX has reflown a Falcon Heavy fairing - a fairing from the second FH flight was reflown on the Starlink mission during November 2019
The site which tracks fairing recovery and reuse (they don't cite evidence however, so take this as you will) suggests:
- Falcon Heavy 1 - not recorded
- Falcon Heavy 2 - Both fairings were recovered, by GO Searcher and GO Navigator, fairing reused on Starlink V1-1 mission
- Falcon Heavy 3 - First fairing catch, both fairings recovered, one caught by Ms.Tree and one recovered by GO Navigator
- Falcon Heavy 4 - Both fairings were new, both fairings were recovered, by Doug
- Falcon Heavy 5 - Both fairings were likely new, both fairings were recovered, by Bob
ETA: as per the comment from Erin, it's worth pointing out that the Falcon 9 and Falcon Heavy series of rockets are a family, not just closely related rockets but interchangeable as well.
Falcon 9 and Falcon Heavy basically use the same core, adjusted for additional boosters of course — but this means that the payload adapters, fairings and other things are identical, and improvements made to one are applicable to the other as well, and discrete parts can be moved between then as demands require.
Evidence of this interchangeability includes the fact that the first FH launch used two side boosters that were previously pre-flown Falcon 9s, and the Falcon 9 that flew CSG-9 on the 31st Jan 2022 was previously a FH side booster.
Fairing compatibility may in future be affected by the introduction of larger fairings for bigger FH payloads — theoretically they should remain compatible with a F9, but practically there may be little reason to fly a larger fairing on a F9.