You're thinking of Castle Bravo.

> From: apptechnz@gmail.com
> Date: Mon, 2 Jun 2014 19:11:01 +1200
> Subject: Re: [OT]:: Patented perpetual motion machine - Ukranian patent
> To: piclist@mit.edu
>=20
> On 2 June 2014 17:36, Sean Breheny <shb7@cornell.edu> wrote:
>=20
> > Wikipedia says 50Mt was the actual yield and that it would have been 10=
0Mt
> > had they not reduced it:
> >
> > http://en.wikipedia.org/wiki/Tsar_Bomba
> >
> > OK. I knew it was a factor of 2 - but I went the wrong way.
>=20
> Try another from memory :-).
> Starfish Prime was about 25 MT and the largest the US made.
> About 25% more yield than expected.
> Led to a most unlucky "Luck Dragon" and beautiful sunsets in N.
>=20
>=20
>           Russell
> --=20
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