Formula 4S Powerboat World Championship

The Formula-4s Powerboat World Championship is an international inshore powerboat racing competition for powerboats organised by the Union Internationale Motonautique (UIM), hence it often being referred to as F4s. “S” letter refers to abbreviation from four-stroke, which means that four-stroke boat engines are being used in this class.

This class was designed as an ecological alternative to UIMS750, UIMS550, UIM F4 and UIM F3 classes. Before getting World Championship status this class was called SL-60. First races were held in Scandinavia in 2005. In year 2009 this class was chosen as a base for ADAC Masters^[1] international series conducted in Germany. In year 2010 class was given current name F-4s and European Championship status. In year 2011 was launched promotional series F-4s conducted together with F1H2O events. In the year 2013 was organized first World Championship in Formula-4s class.

For the present moment class F-4s has most dynamic evolution in a powerboat races. Stages of championships are conducted in various countries, such as Hungary, Latvia, Finland, France, Great Britain, Germany, Norway, Sweden, Italy. Besides World and European Championships, prestigious international series are conducted such as ADAC Masters, Germany and promotional F-4s series to support F1H2O. In 2014 over 50 pilots participated in international series. And it is not able to count the number of national series pilots. Also a large number of open international events are conducted in different counties such as USA, China, United Arabian Emirates, Baltic and Scandinavian and many other countries. It need to emphasize promotional F-4s series, which was funded to create a reserve of young pilots and give them opportunity to learn circuits of F1H2O. Races are conducted together with Royal Races at same weekend. This popularity can be explained with several reasons. One is a good safety. Boats of F-4s are equipped with safety cockpits taken from elder classes F1H2O and F2H2O. Currently, no fatalities or serious injuries among pilots of this class have been recorded. Also it need to emphasize affordable price of enter to this class and low costs comparing to other Formula classes – F1, F2, F500. However performance rates of assembling and tuning-up are close to elder classes. Several weeks of serious job needed to be done by highly skilled mechanics. Normally this kind of work is done by shipyards or racing clubs with proper equipment. Finally, one of the main reasons pilots participate it these races is because this class is a shortest way to Royal Races. F-4s one of few classes which gives right to apply for super-license after having some experience (eight races according to UIM rules). F-4s boats have same steering as an elder classes, corrected to speed. F-4s is a best practice for pilots. It was proven by tests of young pilots in F1 and F2 classes.

Boats in F-4s class is a tunnel catamaran. Construction technologies are same to elder classes. Newest technology and modern materials, such as carbon, kevlar, nomex, new types of polymer resin are used to construct boats. Costs of materials and manpower are high, same as in other Formula classes. That is because of high performance is need and high safety. Modern F-4s boats, like older classes, are equipped with 3000N/sm2 safety cockpits.

Many companies and private boat builders in Europe, USA, and China produce boats of this class. Leading companies are BABA Racing (Italy) Archived 2001-04-17 at the Wayback Machine, ASV (Hungary), [https://web.archive.org/web/20141028075654/http://www.molgaard-racing.com/f4-gen-2/ Molgaard Racing (Denmark) and in the lead is Lönnberg (Finland)

According to UIM rules, the four-stroke Mercury 60 EFI Racing is the only engine that can be used for this class.

Engine data:
Power: 60Ps
Volume: 995cc
Number of cylinders: 4
Weight: 118 kg

Stages of World and European championships is being conducted on circuits homologated by UIM. Number of boats in a heat should not exceed number of boats in homologation of race course. Participants of main heats are selected by qualification. Maximum straight is 600m. Races running anticlockwise. There are a minimum of two heats and generally there are three or four. Pilots are scored for each heat according to UIM rules. Winner is defined by sum of points.

World champions:

Season	Champion	Runner up	Second runner up
2023	VILMUNEN, Jarno	SOLVANG, Andrè	STAINYS, Paulius
2022	ARAND, Stefan	VIRTANEN, Roope	WIBERG, Mathilda
2021	REINIKAINEN, Sami	ARAND, Stefan	LINDHOLM, Alexander
2020	LINDHOLM, Alexander	WECKSTRÖM, Alec	VIRTANEN, Roope
2019	LEHTONEN, Tuukka	LIJCS, Nikita	LINDHOLM, Alexander
2018	JERNFAST, Morgan	LIJCS, Nikita	LEHTONEN, Tuukka
2017	MANNINEN, Juho-Matti	LIJCS, Nikita	VIIPPO, Kalle
2016	MANNINEN, Juho-Matti	LIJCS, Nikita	VIIPPO, Kalle
2015	COMPARATO, Alberto	LINDSTRÖM, Risto	NYHOLM, Anton
2014	COMPARATO, Alberto	LIJCS, Nikita	MANIEWSKI, Adrian
2013	TABORI, Aron	MANIEWSKI, Adrian	RIABKO, Edgars
2012	SÖDERLING, Tobias	MANIEWSKI, Adrian	RIABKO, Edgars
2011	MOROZS, Mārtiņš	SAMUELSSON, Oskar	MANIEWSKI, Adrian
2010	SPARRING, Daniel	PRZYBYL, Ada	SCHELLER, Alexander
2009	HAGIN, Stefan	SAMUELSSON, Oskar	GIMPL, Norbert
2008	SPARRING, Daniel	SAMUELSSON, Oskar	GIMPL, Norbert

Formula 1 F4-s World Series:

Season	Winner	Runner up	Second runner up
2023	No championship held	No championship held	No championship held
2022	No championship held	No championship held	No championship held
2021	No championship held	No championship held	No championship held
2020	No championship held	No championship held	No championship held
2019	STILZ, Max	SMITH, Harvey	AL MEHAIRBI, Mohammed
2018	CHIAPPE, Tom	STILZ, Max	WHITTLE, Sam
2017	AL MANSOORI, Mansoor	BRISSET, Jeremy	AL MEHAIRBI, Mohammed
2016	AL QAMZI, Rashed	ZANDBERGEN, Ferdinand	BRISSET, Jeremy
2015	SZYMURA, Mike	NYHOLM, Anton	HALVORSEN, Joakim
2014	SZYMURA, Mike	BRINEY, Rigby	AL KUWARI, Khalid
2013	SZYMURA, Mike	FRIBERG, Nicklas	WU, Bincheng
2012	FORSS, Jesper	PALFREYMAN, Matthew	MUNTHE-KAAS, Tobias
2011	PALFREYMAN, Matthew	SJÖHOLM, Bimba	AL SHAMLAN, Khalid
2010	SAMUELSSON, Oskar	ROMS, Filip	HAGIN, Stefan

European champions:

Season	Champion	Runner up	Second runner up
2023	VILMUNEN, Jarno	SOLVANG, Andrè	WIBERG, Hilmer
2022	ARAND, Stefan	SOLVANG, Andrè	LIJCS, Nikita
2020	No championship held
2019	LEHTONEN, Tuukka	TABORI, Aron	HORWARTH, Attila
2018	JERNFAST, Morgan	LEHTONEN, Tuukka	JELF, Ben
2017	REVERT, Rudy	MANNINEN, Juho-Matti	JELF, Ben
2016	MANNINEN, Juho-Matti	SEDERHOLM, Magnus	MORSE, Ben
2015	MANNINEN, Juho-Matti	SEDERHOLM, Magnus	LIJCS, Nikita
2014	COMPARATO, Alberto	LIJCS, Nikita	MANIEWSKI, Adrian
2013	MARTIN, Olle	TABORI, Aron	MANIEWSKI, Adrian
2012	SÖDERLING, Tobias	SAUERSSING, Manuel	RIABKO, Edgars
2011	SAUERSSING, Manuel	MOROZS, Mārtiņš	MANIEWSKI, Adrian
2010	HAGIN, Stefan	MANIEWSKI, Adrian	MOROZS, Mārtiņš