Recent Posts

1

Bavaria Yacht Help! / Re: Cockpit recaulking - how to deal with edge seam near gelcoat?

« Last post by marioxp on Yesterday at 13:09 »

I would not advise you to sand before caulking. Because you will definitely have to sand after caulking.
I masked everything with tape, after I applied the caulk, I leveled the caulk with a credit card.  Immediately, while it was still fresh, I removed the masking tape.  I am very satisfied with the result.  I used a Sika 290DC.
I just had to sand a little.

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Bavaria Yacht Help! / Re: MD22l timing belt deflection

« Last post by IslandAlchemy on Yesterday at 09:13 »

When the belt is on, if you get hold of it between the two top gears, you want to be able to twist it 45 degrees. That will be the right tension.

Thanks, IslandAlchemy

45 or 90 degrees?

45 degrees either way.

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Bavaria Yacht Help! / Re: MD22l timing belt deflection

« Last post by mibbal on April 23 2024, 23:08 »

Whauu! That's amazing. Thanks a lot for the idea and formulas, will proceed this way!

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Bavaria Yacht Help! / Re: Cockpit recaulking - how to deal with edge seam near gelcoat?

« Last post by mibbal on April 23 2024, 23:06 »

Thanks Folks for the advises!

Should I sand after removing old caulking (before applying new one)? In some sources it is recommended to do so, but I'm not sure why. I guess sanding before application of new caulking may help to make surface smooth. Any suggestions?

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Bavaria Yacht Help! / Re: Cockpit recaulking - how to deal with edge seam near gelcoat?

« Last post by Odysseus on April 23 2024, 11:08 »

I agree white spirit is good for cleaning, not as aggressive as acetone. However i used CTI sealent, i find it does not melt in hot sum.

Odysseus
Bav38

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Bavaria Yacht Help! / Re: MD22l timing belt deflection

« Last post by sy_Anniina on April 23 2024, 07:51 »

I have been wondering about belt tension measurement as well - changing our belt has been on the long list of "maybe this year" jobs. I feel embarrassed as an old physicist not having thought about the frequency method 

Just FYI - found an online frequency calculator that will give you the frequency once you have the relative input data Yngmar stated above. https://www.clavis.co.uk/belt-calculator/

BR,

Tommi - s/y Anniina

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Bavaria Yacht Help! / Re: Cockpit recaulking - how to deal with edge seam near gelcoat?

« Last post by Ailatan on April 23 2024, 06:04 »

Acetone also worked for me.
Take into account that TDS SIS440 shrink a lot so even if you use a straight tool you will finish with a concave shape

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Bavaria Yacht Help! / Re: Cockpit recaulking - how to deal with edge seam near gelcoat?

« Last post by Yngmar on April 22 2024, 22:17 »

Masking tape and finger if you want a concave seam, or a wooden stick if you want straight. White spirit should be sufficient, acetone probably not ideal. Have a big bucket/cardboard box with bin liner and brick in the bottom to toss in the masking tape without dripping everywhere.

Then don't step into it. Good luck!

9

Bavaria Yacht Help! / Re: MD22l timing belt deflection

« Last post by Yngmar on April 22 2024, 22:13 »

You can also check belt tension by plinking it like a guitar string and checking the frequency it vibrates at. Need to measure the length over which it can swing freely and weigh the new belt before installation (total length is on the packaging). That gives you the frequency to tune the belt to. A guitar tuning app on the phone is sufficient.

That's how I did it and it worked well. Can't find my notes with the calculation now, but that's how they do it in industrial and automotive applications too.

The twist method is ok for a basic sanity check, but very inaccurate.

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Bavaria Yacht Help! / Re: MD22l timing belt deflection

« Last post by mibbal on April 22 2024, 21:25 »

When the belt is on, if you get hold of it between the two top gears, you want to be able to twist it 45 degrees. That will be the right tension.

Thanks, IslandAlchemy

45 or 90 degrees?