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Drilling the boom

 
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yvanboniec



Joined: 08 Mar 2012
Posts: 100

PostPosted: Sat Oct 06, 2012 12:22 pm    Post subject: Drilling the boom Reply with quote

Hi !

This is Yvan, you friend from the Middle-East. I bet you missed me.

I just returned from France (the only country where people are madder than me) where I bought a 7.5 sqm sail.

I just realized my current boom (160mm to 210mmm) was too short. I need an extra 9mm.

Has anyone drilled extra holes on the boom sliding extension? Apart from drifting into iranian waters, what are the risk involved?
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swchandler



Joined: 08 Nov 1993
Posts: 5908

PostPosted: Sat Oct 06, 2012 12:54 pm    Post subject: Reply with quote

I wouldn't do it. Just like with mast extensions and masts, you need so much insertion or overlap to establish a sound bearing surface. Otherwise, you risk failure in the boom arm/rear extension interface. Time to buy a bigger boom. Maybe an aluminum one to keep the cost down.
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U2U2U2



Joined: 06 Jul 2001
Posts: 3085
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Sat Oct 06, 2012 4:49 pm    Post subject: Reply with quote

It was designed to slide out so far, the holes only go so far for a reason.

You need a longer boom.

PS you would lose the bet.

PSS your travels are limited somewhat France is tame

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thombiz



Joined: 25 Jun 2007
Posts: 577
Location: Corpus Christi

PostPosted: Sat Oct 06, 2012 5:22 pm    Post subject: Reply with quote

Using a mast ferrel as an example, you should be able to safely drill a hole as long as the boom extension end is at least 5 x (the diameter of the tubing) into the boom arm. If the extension tube diameter is 2.5 cm, then it needs to extend into the arm at least 12.5 cm.
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U2U2U2



Joined: 06 Jul 2001
Posts: 3085
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Sat Oct 06, 2012 5:34 pm    Post subject: Reply with quote

I would agree with your assessment.

The HotSails Maui boom that was most accessible to measure, has its last hole exactly 12.5cm as you stated, which would mean DON"T drill any more,
YMMV

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zirtaeb



Joined: 03 Jul 2009
Posts: 2413

PostPosted: Sat Oct 06, 2012 7:39 pm    Post subject: Reply with quote

As in masts, dont drill booms.
You can drill base of fins or deck pads if you want, that's it.
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yvanboniec



Joined: 08 Mar 2012
Posts: 100

PostPosted: Sat Oct 06, 2012 11:59 pm    Post subject: Can't wait to try Reply with quote

Hi !

It is nice to wake up with all these suggestions.

It is not that I can't afford it (I am sitting on oil), it is just that I want to use the boom to its core. That is my style of recycling.

I am in the office today. Here, we work on sunday (but Friday is off).

I will try this afternoon, and let you know the outcome.

thombiz, this is the greatest suggestion of the summer. If I could make you a sheikh, I would.
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yvanboniec



Joined: 08 Mar 2012
Posts: 100

PostPosted: Sun Oct 07, 2012 9:48 am    Post subject: Follow-up Reply with quote

oops I did it again.

I don't know what that Taiwanese boom is made of.

The plastic cleat was worn-out after 6 sessions at sea, but my drill (3,000 rounds per minute) was not powerful enough to drill a hole and I almost lost my hand in the process.

I found a small hardware shop with heavy duty tools to do it for me.

Double serving of kebabs for everyone if it works tomorrow.
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stevenbard



Joined: 11 Nov 1993
Posts: 4240

PostPosted: Sun Oct 07, 2012 6:25 pm    Post subject: Reply with quote

Watch out for the mines in the Straights of Hormuz....Doesn't someone out there have a large aluminum boom you can send him?
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yvanboniec



Joined: 08 Mar 2012
Posts: 100

PostPosted: Wed Oct 10, 2012 4:06 am    Post subject: Russian Madness Reply with quote

Hi !

It worked on one on side of the boom only (so, only half serving of Kebab for everyone). The cogs would not fit on the other side.

Then, i was left with two options. I either returned to the shop to adjust it, or I switched to my old boom and a shorter sail for immediate sailing.

Guess what I did. I chose the second option. I just could not wait to sail. I will be on a business trip to Europe in two weeks and I will buy a new boom with the right lenght.

Considering the time I spent on this - unresolved - issue, it ended up being more expensive than buying a brand new boom.

However, my board stirred quite an interest from the Russian crowd at the hotel.
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