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Old 18th June 2007, 06:02 PM   #1
Join Date: Dec 2006
Posts: 1,321
Default Formula or Isonic 155 lt.?

What are the main differences between Formula and I sonic 155 lt.; my weight is about 83 Kg and I sail normally with sails of 10-11 mq in lake at 90% of my time. Do You think that Isonic is faster then formula but more slow in early planning? Thanks. Danilo

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Old 19th June 2007, 02:11 PM   #2
Ian Fox
Join Date: Aug 2006
Posts: 533
Default RE: Formula or Isonic 155 lt.?

Hi Danilo,

Formula has more tail width, wider stance and harder rail, all of which improve the performance at lighter winds, early planing and upwind in combinattion with bigger FW fins and sails.
The iS155 has a narrower tail, slightly softer rails and an increase in control/comfort levels in choppy, more powered (by ~150Lt) conditions and an easier, more natural (for 150Lts ) jibe..

Please see also the discussion on the FW vs 155 at


and let us know if you have any further questions you would like resolved.

Cheers ~ Ian
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Old 6th November 2012, 11:13 PM   #3
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