Hi, can you write personally which kind of flute you tried is the loudest one?
Just for curiosity, making a top 5 could be cool as well!!!
Cheers!
In one sense; whatever Conal O’Grada is playing at that time.
In another sense, the Boehm flute in the right player’s hands can blow most other flutes out of the water on
sheer volume.
My money’s on Marcus Hernon on one of his own flutes 
Right, Marcus Hernon it is - on just about any flute in his hands.
It’s not about the flute!
This one probably honks along pretty good…
And apropos of nothing, but I just happened to come across it and it looked interesting…
Best wishes.
Steve
Rob Forbes Pratten, but it’s not wood. Does Delrin count?
Redheads, always so Satyrical.
LOL.
Conal is a loud player anyway 
I guess top 5:
1- Hammy hamilton
2- Grinter
3- Murray
4- Cotter
5- Hernon
However I’m not totally sure about.
The loudest I think I’ve heard is a Gilles Lehart. A Hammy often cuts through other instruments, an effect not only due to loudness.
Different lips will work differently on different flutes. There is a range of flutes that seem to sound louder than another range of flutes when played by a range of people, but in general your question has no answer…
“Different lips will work differently on different flutes. There is a range of flutes that seem to sound louder than another range of flutes when played by a range of people, but in general your question has no answer…” Lorenzo
Very true.
I’d guess Conal O’Grada (Hamilton?), Kevin Crawford (Grinter), and Ciaran Somers (Wilkes?) are the most powerful, and brilliant flute players I’ve heard so far, although the most powerful tone I’ve ever heard live would be from Pat Mahon back in 1998 playing some nameless, keyless flute in Brennan’s, Tubber. My ears are still ringing 16 years on!
Ciaran Somers plays a D Poljez flute, and Conal O’Grada a Hammy. Both flutes can be very loud if the player wants it to be.
Thanks for the answer!
I agree with Bran too.
However guys, it’s obvious that when I ask a louder list of flutes I think several flutes played by one “target” standard lips or flautist.
The question is more related by your personal experience with different flutes. Captain Obvious too can afford that if you give a Grinter to Ciaran Somers sounds louder than player by McGoldrick, but that is not the question. 
“but in general your question has no answer…” Lorenzo.
When I got an Olwell Pratten it was louder than my other flutes to begin with, but after a while I found that my other flutes were also capable of being as loud as the Olwell. I guess my technique improved, which made it easier to increase the volume of the other flutes. As someone mentioned it’s not always the “loudest” flutes you’ll hear the most in say a session. Tone plays an important part. Also loudness isn’t always the best choice, unless you possess a large ego and constantly crave attention. Sometimes it’s nice to blend in with the other players. Loudness isn’t that important really, better to try and become a good flute player
My experience, too. Past a certain point, it’s really a combination of tone and the ability to fill a flute that makes it seem loud. “Authority” might be a better term for this than “volume.” In my experience, it seems the harder one tries to be loud, the less good a flute will sound – but if you aim for authority, you’ll achieve the desired result.
Meanwhile … the loudest flute sound I’ve ever heard came from a Casey Burns flute in the hands of someone who had plenty of authority but alas, not much control or musicality. Turned a nice instrument into a flute-zooka!
Edited to add that I think the biggest-sounding flutes I’ve heard across the board are Olwells. Then again, since I play one and do tend to be too loud, maybe I’m drowning everything else out 
I’m not really sure why, but I would love to have heard that.
Indeed. However in my case, I need to play several times outdoor with a loud uilleann pipe and sometimes with a bagpipe too. That’s why loud is necessary for me, and I think for all buskers in the world that don’t use amplification.
What flute do you currently play in these outdoor situations?
Have you tried wearing a hat?
No, I’m not kidding.