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Basher said..
I was out windsurfing yesterday thinking some more about this.
I was on wave gear, and I fully accept that we might sail wave gear differently than slalom gear.
But this issue is still about mast rake.
If you set your straps at the back of the board and set your mast foot well forwards then the mast is raked back and you're probably in old school stance.
Angling the mast back in this way drops the boom, especially at the point where you hook in, and then shifting the boom front end higher doesn't really help that much - or not as much as it would if you had the mast more upright.
If you have a dual cringle at the sail clew, then raising the boom back end to the higher setting would help more. But then some people will tell you that's not what those dual clew cringles are for. (Nobody quite agrees what they are for, but you can certainly use them to change boom height. )
The other point to make here is that those using too long a fin in the back end of their slalom or free ride board might feel they have to have the mast foot right forwards in the mast track (to reduce fin torque load). So, in turn, it's actually the over size fin that is causing their boom height problems.
We can also think about boom cutaways in relation to people height.
If one person is 5ft tall and another is 6ft 6" that's a difference of 1ft 6inches.
The average boom cutaway range is 2ft or 600mm.
Plus your hook height doesn't necessarily rise in relation to your overall height.
In perfect 7 stance, a tall person's hook height is probably only a foot higher than a short person's hook height.
So this is still really about your mast foot position in relation to your footstrap positions, more than it's about some mistake the sailmaker has made with the boom cutaway.
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Ben1973 said..
On my fox 120 I generally have the mast base in the rear half of the track with 7.8 and 8.6 M3's and front straps in the middle and the rears as far back as they go.
But Ben has said he uses the rear half of the track. So how can this be about rake?
Dual cringles, higher for tighter leech and more power, lower for more twist.
Too large a fin? How about too small, so to get more power the boom has to be raised?
The Fox has a mast track in an average position, its longer than most. Photo nicked from the Windsurf mag 2020 test.
As Ben hasnt given us a picture or video, its all speculation. But I would guess that now he has a Falcon and doesnt have the issue now, the Falcon board and fin gives more lift than the Fox so he doesnt need to use a higher boom.
ps 8.6m on a Fox 120 isnt a good lightwind setup for the larger sailor.