Is this a rigger design which is known to run well? While sponson aoa is important, it sounds to me that the underlying cause of the violent sponson walk is something else. If this is a JAE 21 then the cause is most definitely not sponson aoa (assuming it was built to plans).
- is the CG at the recommended location? Too far back can cause the issue
- is the strut angle correct? angled up at the prop end can cause light sponsons
- is the prop appropriate? A prop with excess diameter for the hull can cause sponson walk
- is the turn fin at the correct angle? This can cause sponson walk
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