IOM design Kantun - means chine in colloquial Croatian language
Designed and built by Robert Grubiša and Zvonko Jelačić
Design goals:
a) IOM design suitable for all range of wind speeds and wave conditions.
b) Investigate the use of chine and narrow beamed hull on all-round IOM boat.
b) Lower the topsides in order to reduce the parasitic hull drag to minimum and increase boat stability.
c) Use of big diameter plastic RC hatch to allow easy access to RC equipment and good ventilation of the hull interior after sailing so sticking and removing of self-adhesive Dacron patches is not needed.
d) Proper alignment of the keel and mast to be achieved by using proper jigs/templates in hull moulding stage of building.
In order to reach design goals, the experience from building/optimizing/sailing Topiko/Pikanto boats was of great help. Robert Grubiša moulded Topiko and Pikanto hulls under SAILSetc licence while Zvonko Jelačić outfitted Pikanto boats in such a way that he won 2009 IOM Worlds in Barbados. Marko Matić used our Pikanto to won 2010 IOM Euro in France.
It was obvious after 2011 IOM Worlds in Great Britain that there is lot of space for new hull form design improvements, especially narrow hulls with chines.
Narrow IOM hull forms were very rare worldwide. Michael Scharmer from Germany used his Scharming designs on several European and World Championships. His approach has not influenced other IOM designs, which were significantly beamier. Chines on IOM hulls were used in early years of the class but for years rounded hull forms dominated on the IOM scene.
We have used summer 2012 for data collecting from various successful IOM designs and implementing them to reach mentioned design goals.
New hull forms are normally developed from existing proven hull forms in order to improve certain design goals. Using of chines on boats is known for decades if not centuries. This is by no means copying of any existing IOM designs or just changing some minor feature.
As Professor E.J.Richards said when opening the Conference on Yacht Design Research in March 1962: “Yacht design, as carried on at present, is rather like making love to a woman. The approach is completely empirical. At the end, the male, even though he might be successful, usually had no idea of just how and why he had succeeded.”
Final Kantun hull form has been reached after six 3D computer models. Kantun Mk3, as third version, has been built in balsa by traditional plank-on-frame method and tested against Croatian fleet consisted of best-proven fast IOM design worldwide.
Kantun Mk3 weak points noticed on trials against the other designs have been noticed and reported for refinement of newer versions of hull form. Promising feedbacks from Kantun Mk3 encouraged us to further refine the hull forms in order to reach the final version. Plug and mould have been made and two boats have been moulded and outfitted to be used by designers/builders on October 2012 CRO IOM Ranking event in Opatija and IOM European Championship in Cres, Croatia in November 2012 where they will be tested against the best European IOM fleet.
Click here for more info about the development of Kantun
September 2012
Written by: Robert Grubiša
Designed and built by Robert Grubiša and Zvonko Jelačić
Design goals:
a) IOM design suitable for all range of wind speeds and wave conditions.
b) Investigate the use of chine and narrow beamed hull on all-round IOM boat.
b) Lower the topsides in order to reduce the parasitic hull drag to minimum and increase boat stability.
c) Use of big diameter plastic RC hatch to allow easy access to RC equipment and good ventilation of the hull interior after sailing so sticking and removing of self-adhesive Dacron patches is not needed.
d) Proper alignment of the keel and mast to be achieved by using proper jigs/templates in hull moulding stage of building.
In order to reach design goals, the experience from building/optimizing/sailing Topiko/Pikanto boats was of great help. Robert Grubiša moulded Topiko and Pikanto hulls under SAILSetc licence while Zvonko Jelačić outfitted Pikanto boats in such a way that he won 2009 IOM Worlds in Barbados. Marko Matić used our Pikanto to won 2010 IOM Euro in France.
It was obvious after 2011 IOM Worlds in Great Britain that there is lot of space for new hull form design improvements, especially narrow hulls with chines.
Narrow IOM hull forms were very rare worldwide. Michael Scharmer from Germany used his Scharming designs on several European and World Championships. His approach has not influenced other IOM designs, which were significantly beamier. Chines on IOM hulls were used in early years of the class but for years rounded hull forms dominated on the IOM scene.
We have used summer 2012 for data collecting from various successful IOM designs and implementing them to reach mentioned design goals.
New hull forms are normally developed from existing proven hull forms in order to improve certain design goals. Using of chines on boats is known for decades if not centuries. This is by no means copying of any existing IOM designs or just changing some minor feature.
As Professor E.J.Richards said when opening the Conference on Yacht Design Research in March 1962: “Yacht design, as carried on at present, is rather like making love to a woman. The approach is completely empirical. At the end, the male, even though he might be successful, usually had no idea of just how and why he had succeeded.”
Final Kantun hull form has been reached after six 3D computer models. Kantun Mk3, as third version, has been built in balsa by traditional plank-on-frame method and tested against Croatian fleet consisted of best-proven fast IOM design worldwide.
Kantun Mk3 weak points noticed on trials against the other designs have been noticed and reported for refinement of newer versions of hull form. Promising feedbacks from Kantun Mk3 encouraged us to further refine the hull forms in order to reach the final version. Plug and mould have been made and two boats have been moulded and outfitted to be used by designers/builders on October 2012 CRO IOM Ranking event in Opatija and IOM European Championship in Cres, Croatia in November 2012 where they will be tested against the best European IOM fleet.
Click here for more info about the development of Kantun
September 2012
Written by: Robert Grubiša