This is easily my favorite mode of transportation in Minetest. The controls feel quite "helicoptery" Easy to fly, but sufficiently challenging to master.
A few problems:
When you die in the helicopter, you tend to get "stuck" in the helicopter. I die, I respawn in my bed, take a few steps, and whoops! I'm back in the helicopter, wherever it happens to be, or even worse, wherever I happened to be the last time I got sucked back into it. A particularly bad example happened today, where I got stuck in the helicopter, which was stuck in a wall, inside my house. Every time I did /killme and respawned, I was stuck in darkness, unable to dismount from the heli. Luckily, the part of my house it happened to get stuck in was unprotected, so I was able to go in as a different character, and chop away at the wall until my main character could get free. If only the helicopter had some sort of emergency eject or self destruct feature for cases like this.
Helicopters (at least on my server?) seem to be indestructable. It seems as if they are /supposed/ to be take damage, but despite my worst efforts, they don't. One problem I have is that players on my server have left a few helicopters in awkward and annoying places (there is one parked sideways on my neighbour's lawn right now) and they are apparently impossible to get rid of. Would be nice if those helicopters were somehow removeable, or able to be confiscated after a set period of disuse such as "player1's OLD helicopter".
The needle for the fuel guage is a bit hard to see , especially when it is at "E" or "F" . This really isn't a problem for me, as I simply altered the textures files "needle" and "panel" to make the fuel guage easier to read, and way more cool looking.
Needle: https://imgur.com/a/ukLVppo Panel: https://imgur.com/2NhqrAG