Bending booms

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Bladez
Bladez
NSW
95 posts
NSW, 95 posts
6 Dec 2007 8:02pm
I've recently decided that I should try and bend my boom back into shape. I'm wondering if many people have done it before. Would it be strong enough to sail with again or is it just rubbish?
I've got nothing to loose from trying it so what ever happens.
Any tips, would it be better to heat it before bending etc?
lanky
lanky
QLD
213 posts
QLD, 213 posts
6 Dec 2007 7:09pm
Don't know how you would heat it without melting the grip and if you take of the grip and put new on afta it will be more work and money than it's worth.
Combs
Combs
WA
152 posts
WA, 152 posts
6 Dec 2007 6:36pm
Tube ali will work harden if you bend it. Heating it won't do any good as it is entirely different to mild steel. Where you bend it will become brittle and it is likely to snap without warning. Leave it as it is, and if it is too far gone, buy a new one.
firiebob
firiebob
WA
3182 posts
WA, 3182 posts
6 Dec 2007 6:51pm
As Combs said, it will definitely work harden, then it will break sooner than later.
3 choices Bladez, bend it, leave it or flick it. Me, I hate swimming, so I'd flick it Mate.
Bladez
Bladez
NSW
95 posts
NSW, 95 posts
6 Dec 2007 8:59pm
I've gotten used to the whole swimming because of broken gear, last thing that went was a uj. A broken boom would be more fun than that swim.
I've aready bought a new boom and I've got nothing else better to do these days so I'm going to try bend it back, see how well it works.
decrepit
decrepit
WA
12885 posts
WA, 12885 posts
6 Dec 2007 9:10pm
I've straightened booms successfully, but don't do it too often, you should get away with it once.

Fill the boom with dry sand first, that will make it much easier and stop it from crimping.
da vecta
da vecta
QLD
2515 posts
QLD, 2515 posts
7 Dec 2007 12:12am
thats a good tip decrepit. i have also heard that haircut can run over them in his car. also i have seen him bending them on playground equipment.
P.C_simpson
P.C_simpson
WA
1492 posts
WA, 1492 posts
8 Dec 2007 4:36pm
yer you can straighten it, but wouldn't be sailing it in strong winds or too far off shore at the local beach.. lakes are fine land alround you..
sailquik
sailquik
VIC
6171 posts
VIC, 6171 posts
8 Dec 2007 9:30pm
Good alloy booms have the tubes bent to shape and THEN they are heated in an oven and tempered to make them really stiff. If it is tempered alloy it may just SNAP as soon as you try to bend it, if you can even bend it at all.

I used to make my own booms way back in the mid '80's from 6000 series aluminum. They cam out nice but they were VERY flexible compared with todays tempered booms. Then I got some tempered tube to make a stiffer boom. The tube is so stiff I could not bend it in my jig even swinging all my weight on the end of a 2m tube. Eventually my jig broke but the tube didn't budge! I chucked it all away and have been getting 'bought ones' ever since.

Heres a suggestion: Many of the alloy boom manufacturers will sell you a new boom arm. Just unscrew the old one and fit a new one! Often this works out at a reasonable cost if the rest of the boom is still in good nick.
Paul Kelf
Paul Kelf
WA
678 posts
WA, 678 posts
9 Dec 2007 12:59pm
Bladez,
I have bent a boom or 2, new & old .
Like Sailquick said 'good alloy booms are heat treated after bending' because after heat treatment they should be very stiff and not bend under normal usage.
All alloy booms bend sooner or later given the right situation including ours!
I straighten a lot of booms of all brands but they seem to be very soft because I can bend them easily in our jigs.
The most recent one I straightened was the worst I've seen and kinked when I straightened it, mainly because I had to bend it so far back into shape.
You can soften the alloy by heating to about 400 deg C but then it is back to being real soft again, needing heat treatment to make it stiff.
If you have success don't trust the boom as you would a new one, use it as a spare only.
Best thing to do is buy a good alloy boom in the first instance, the best you can afford to break & one you can get spares for.

Paul
NotWal
NotWal
QLD
7436 posts
QLD, 7436 posts
9 Dec 2007 2:14pm
How can you tell if booms have been heat treated or not?
decrepit
decrepit
WA
12885 posts
WA, 12885 posts
9 Dec 2007 8:31pm
By how hard they are to bend????
sonic
sonic
QLD
756 posts
QLD, 756 posts
10 Dec 2007 12:27pm
Mate once they start bending, creaking its only a matter of time,its one of the cheaper parts we use compared to,sails,masts,boards get rid and get a new one is my advice.
Paul Kelf
Paul Kelf
WA
678 posts
WA, 678 posts
10 Dec 2007 12:09pm
NotWal said...

How can you tell if booms have been heat treated or not?


You can't! Unless it has Hydrodynamix on it then you can be sure!
To my knowledge most brands are bent in the hardened state so they are nicely pre-stressed and ready to break asap.
I have seen video of the cheapies being bent after gripping so that would indicate they are not post heat treated for sure.
When companies quote numbers like T6 & T8 that also indicates they are using hard material before bending.
I can only guarantee 100% that ours are post heat treated, our process hasn't changed much in 20 years. I believe any made from Ergal should not need heat treatment as the 7000 series alloy naturally ages / hardens very quickly without any heating, that's why we don't use it, it would be aged / hardened by the time we got the material from overseas.

Paul
Paul Kelf
Paul Kelf
WA
678 posts
WA, 678 posts
10 Dec 2007 12:11pm
Bladez,
Try facing the right way when sailing, you might not damage as much gear.
MikeyS
MikeyS
VIC
1509 posts
VIC, 1509 posts
10 Dec 2007 2:38pm
Every time I've snapped an aluminium boom, the break looks like the natural predator of a film sail and human flesh, ie. jagged and sharp. So when you say you've got nothing to loose, you might want to consider this.
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