2015 H1 Unlimited season

The 2015 H1 Unlimited season is the sixtieth running of the H1 Unlimited series for unlimited hydroplanes, sanctioned by the APBA. It will be the first time since 2009 that the series will have no sanctioning from the UIM.

Currently, all boats will be using Lycoming Engines with the exception of the U-3 Go3Racing team which uses an Allison V-12 engine and the U-18 Bucket List Racing team that uses a smaller T-53 Lycoming turbine engine..

...
Wikipedia