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633/91/483 whistling relief and new stab?

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Whattheflock
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633/91/483 whistling relief and new stab?

Postby Whattheflock » Thu Aug 13, 2020 4:28 pm

My 633 setup whistles quite abit at times and would like to fix it. Ive read sanding down the trailing edge of the mast flat will help. Does anyone have some tips or trick to doing this?? I have some 1000grit wet sand paper at home and was going to use a chunk of 2x4 as a sanding block..

Id also like to make the 633 a little more lively with a smaller stab, read the 330 suits it better? Im just into strapless freeride.
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TomW
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Re: 633/91/483 whistling relief and new stab?

Postby TomW » Thu Aug 13, 2020 6:51 pm

its most likely not the mast. I've never heard of a Moses 633 whistling...
The trailing edge of wings is usually the source, but Moses wings are generally well finished on TE.
My 590 wing whistled out of the box, it turned out there were a few small pinholes in the clear coat. I had to paint and sand the wing.
Google around and you'll find some guidance, then do the stab first, then the front wing. Check the surfaces of the wings for pinholes or imperfections

Whattheflock
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Re: 633/91/483 whistling relief and new stab?

Postby Whattheflock » Thu Aug 13, 2020 7:51 pm

TomW wrote:
Thu Aug 13, 2020 6:51 pm
its most likely not the mast. I've never heard of a Moses 633 whistling...
The trailing edge of wings is usually the source, but Moses wings are generally well finished on TE.
My 590 wing whistled out of the box, it turned out there were a few small pinholes in the clear coat. I had to paint and sand the wing.
Google around and you'll find some guidance, then do the stab first, then the front wing. Check the surfaces of the wings for pinholes or imperfections
Alright Ill look for that Tom. It gets pretty loud, everyone comments on my "screamer" of a wing.

Mossy 757
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Re: 633/91/483 whistling relief and new stab?

Postby Mossy 757 » Thu Aug 13, 2020 9:56 pm




So I wouldn't square your TE's, I'd probably do what George is suggesting here. I would only do this if I could confirm an imperfection either visually or by touch, such an imperfection might cause a loud noise like you're experiencing.

Whattheflock
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Re: 633/91/483 whistling relief and new stab?

Postby Whattheflock » Thu Aug 13, 2020 10:08 pm

Mossy 757 wrote:
Thu Aug 13, 2020 9:56 pm



So I wouldn't square your TE's, I'd probably do what George is suggesting here. I would only do this if I could confirm an imperfection either visually or by touch, such an imperfection might cause a loud noise like you're experiencing.
Thanks for the advice! Ill check it out.

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Re: 633/91/483 whistling relief and new stab?

Postby Oldman » Fri Aug 14, 2020 12:11 am

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TomW
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Re: 633/91/483 whistling relief and new stab?

Postby TomW » Fri Aug 14, 2020 9:50 am

If the sound is changing pitch and volume depending on speed and angle to wind, then my hypothesis is that its the TE. If you are getting a multi-tonal disharmonic sound, ( cats fighting) its probably both wings.
when i had my 590 wing with the pin holes, it "whined" with a more constant sound on all points of sail.
I used to think this was a big problem, but after sanding multiple wings, i learned its totally fixable. Foiling with a noisy foil is intolerable!

Whattheflock
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Re: 633/91/483 whistling relief and new stab?

Postby Whattheflock » Fri Aug 14, 2020 10:41 am

TomW wrote:
Fri Aug 14, 2020 9:50 am
If the sound is changing pitch and volume depending on speed and angle to wind, then my hypothesis is that its the TE. If you are getting a multi-tonal disharmonic sound, ( cats fighting) its probably both wings.
when i had my 590 wing with the pin holes, it "whined" with a more constant sound on all points of sail.
I used to think this was a big problem, but after sanding multiple wings, i learned its totally fixable. Foiling with a noisy foil is intolerable!
Still have to dig into this, but the whine changes pitch with speed. It can get pretty loud!

Whattheflock
Medium Poster
Posts: 171
Joined: Sun Jul 29, 2012 6:23 pm
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Weight: 70kg
Local Beach: Secret.
Favorite Beaches: Open beaches.
Style: Strapless Foil
Gear: 7m prodigy, 10m flite, Moses DC 3'6" and 633/483/91cm
Brand Affiliation: None
Has thanked: 11 times
Been thanked: 23 times

Re: 633/91/483 whistling relief and new stab?

Postby Whattheflock » Sun Aug 30, 2020 3:34 pm

So I wet sanded the trailing edge of my mast with 1000grit like the "exfabrica" video shows and its mostly silent now. Just a little hum if im going fast. Thanks for the help!!!
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Re: 633/91/483 whistling relief and new stab?

Postby Foil » Sun Aug 30, 2020 4:30 pm

Whattheflock wrote:
Sun Aug 30, 2020 3:34 pm
So I wet sanded the trailing edge of my mast with 1000grit like the "exfabrica" video shows and its mostly silent now. Just a little hum if im going fast. Thanks for the help!!!
totally silent at any speed or angle is bliss, and you would never accept anything else once you get total silence.
I have never had a wing or stab that has been a hummer, only the mast, and every mast has been noisy, apart from one,
the new 82cm moses carbon, totally silent from new.


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