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tibogoderis
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Moses 679

Postby tibogoderis » Thu Jul 23, 2020 9:01 pm

Hi all,

I recently bought myself the moses 679 with 82 carbon mast. I'v been using it 3 times now. After the session I noticed the 2 the screws that connect the mast and fuselage are loose. Before ever session I tighten them really well.

Am I not tighten it well enough? Or is it because of vibration de screws are getting loose? I'm scared I would loose fuselage and wings while kiting.

Tibo

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Re: Moses 679

Postby grigorib » Thu Jul 23, 2020 10:22 pm

Tighten the bolts again up after first and second sessions and they will stay put. Don’t overtighten them - you don’t want to extract mast inserts like teeth

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Re: Moses 679

Postby Sbrinckman » Thu Jul 23, 2020 10:50 pm

Hi Tibogoderis, it had been mentioned before.

viewtopic.php?f=196&t=2406412&hilit=Loose

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Re: Moses 679

Postby nothing2seehere » Fri Jul 24, 2020 11:34 am

Did it come with anti seize paste for the screws?

Not Moses, but my aluminium hydrofoil had a similar problem that went away when I applied the anti seize paste to the screws. Whether its the paste stopping it loosening as it thickens over the threads or whether its the difference in tactile feel that means you tighten up more I can't say?

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Re: Moses 679

Postby cwood » Fri Jul 24, 2020 1:13 pm

very common on Moses fuselages. If it's any comfort, I have never had a screw come out completely in hundreds of sessions.....loose yes but never out.....and the forces of course keep the parts pushed together. That said, I have found that a careful and progressive back and forth tightening front to back to front (etc) that rocks the fuse down onto the mast, with some body force down results in the front one staying tight more often. Also note, that it is possible to end up with a seemingly tight connection that is skewed a tiny bit, which actually can change your CG (center of gravity due to angle between the mast and fuse connection not being factory intended). I always eyeball the top of the mast foot where it sticks forward and aft in relation to the top of the fuse to ensure they are equal. This may seem anal but I have seen on numerous masts where the foot that fits into the fuse is a bit chubby and it causes this potential skewed fit. Test your connection without screws....fit the fuse on and see if it rocks a bit with body weight down onto it onto the mast, or if it sits flat with no play whatsoever.

tibogoderis
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Re: Moses 679

Postby tibogoderis » Sun Jul 26, 2020 4:09 am

2 sessions later now. I tried it by applying first some bodyweight in front and tightening the front screw, the same at the back. I noticed after 1 hour session the screws where still tight.
Not as tight as before the session but enough that it makes me feel comfortabel.

Thanks for all the tips!

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Re: Moses 679

Postby Foil » Sun Jul 26, 2020 4:43 am

tibogoderis wrote:
Sun Jul 26, 2020 4:09 am
2 sessions later now. I tried it by applying first some bodyweight in front and tightening the front screw, the same at the back. I noticed after 1 hour session the screws where still tight.
Not as tight as before the session but enough that it makes me feel comfortabel.

Thanks for all the tips!
and don't worry as the inserts are not just small items,they can't be pulled out, the large reinforcement part that is hidden inside the lower mast is huge, maybe 25 cm long and 10-15 cm wide, Check the x ray of the mast I have posted on this subject a few times before.
yes its a bit of a faff to get used to, a small routine of first making absolutely sure the mating surfaces are spotless, no tiny sand particles on the mating surfaces,
all threads rinsed clean,
washers in place every time, pinch up bolts evenly to two fingers pressure, and then rock back and forth on the wings to ensure the parts are seated correctly and then a final 3 finger tighten up of both bolts.
most times the bolts feel slightly looser after a long session or even a 30 minute short session, and less often they feel almost as tight, but never do they feel as tight as before hitting the water, but just keep to the routine and keep the surfaces spotless, not a problem, lock washers are not the answer, tried all washer types and the standard flat ones are the best.
remember to keep your oily hands off the wing and mast surfaces at all times, keep the covers on when you do the above.


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