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Old 11 November 2013, 12:10   #1
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how to stop roller swing arms 'tipping over'?

Hi all,
I've got a roller coaster trailer - probably their "roller coaster 10" or similar .
ROLLER COASTER 10 | Roller Coaster | Marine | Leisure | Trailer Range | Indespension
I've just been replacing all the split pins, washers and bolts for the rollers and swing arms as they corroded through and I lost a roller. (these things: NA026 | Ribbed Parts | Boats Pads & Rollers | Marine Spares | Trailer Parts | Indespension )
Winching the boat back onto the trailer is now a breeze, but I had unknowingly been relying on the seized swing arms from stopping
waves flipping them over when recovering the boat back onto the trailer. Now that they all swing/pivot freely, it is a P.I.T.A to recover the boat in wavey conditions as you have to keep flipping errant arms back to sloping inwards. I have now twice inadvertently winched the boat onto an end-on roller that had flipped over in a wave (local slip is v.exposed).
Has anyone got any tips for stopping them tipping over? I was thinking perhaps small lead weights bolted to the inner side of the swing arms, or perhaps bungee chord to loosely tie them down, or even weld pins across the outside edge of their clevis mounting brackets so they cannot rotate too far (they need only rotate perhaps 45 degrees max from their rest position when the boat is recovered).
I am reluctant to simply tighten the swing arm brackets to increase friction as this sounds like a recipe for corrosion and seizing.

The trailer is perhaps 15 years old - not sure if the latest designs suffer the same problems?
any tips welcomed..
thanks
steve
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Old 11 November 2013, 12:41   #2
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sounds like the rollers weigh more than the swing beam, so with the help of a wave it's just over balanced, mine does the same while being reversed into the water but swings back the right way up when the trailer stops moving, I'd try the bungee to see if that does the trick.
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Old 11 November 2013, 12:52   #3
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is it the the 'dumbell bars' that keep moving? if so, i have the same problem with mine as the rollers float level and easily rock over towards the outside of the trailer. my solution is to leave the trailer in much shallower water and put a bit more effort into winching! i find this also keeps the boat firmly located within the rollers even in heavy waves.
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Old 11 November 2013, 12:56   #4
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You can weld or make a bolt on bracket to stop that, it's quite common
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Old 11 November 2013, 13:24   #5
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Quote:
Originally Posted by Festinghouse View Post
is it the the 'dumbell bars' that keep moving? if so, i have the same problem with mine as the rollers float level and easily rock over towards the outside of the trailer. my solution is to leave the trailer in much shallower water and put a bit more effort into winching! i find this also keeps the boat firmly located within the rollers even in heavy waves.
Yep that's it ( you put it better than I did)
Sounds sensible to keep the rollers shallow-I do try not to put the trailer in too deep - but if the waves are over a foot high they still flip the rollers. That and it is sometimes the wife doing the winching!
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Old 11 November 2013, 13:35   #6
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I use those really tough bungies of a trampoline, all the rollers pull in, and the swing bar is forced to face rear when unloaded.
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Old 12 November 2013, 06:40   #7
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Thanks for the photos Dragonhawk ficht - that makes sense. I'll give this a go first.

now I've gone and dug myself into a hole and feeling a little ignorant:
I was referring just to the 'dumbell' bits with the two rollers, and how they would flip outwards - see photo below...


but..I just assumed the transverse beam holding the roller sets was rigid, but
now you all mention it, I guess this should be pivoting too - and I've never noticed. See photo below - the beam outlined in RED should be swinging too?

Now the bungee running along the line of the keel in Dragonhawk's photo makes sense! This beam doesn't budge on my trailer (never has - 2nd hand to me)

Now I'm looking closely, I have the same coupling for the beam at the front too - which is also seized and should be pivoting too?


It recovers so well without these beams swinging - I'm tempted to leave them alone...especially as the hook on the bottom of the swing beam is a great tie-down point at the transom
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Old 12 November 2013, 10:29   #8
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ah, I see it all, a picture paints a thousand words if it were me, n I know I'm gonna get shouted down, but who cares I would nip the bolts up on the dumb bell fixing just enough to stop the waves moving them but still allowing them to self adjust, and I would deffo get the swinging beams moving again, they make recovery so much easier if they can self adjust to the hull climbing into the rollers, but heh, I know nowt, I get Chris Ty Calch n his team to launch n recover our rib
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Old 12 November 2013, 10:53   #9
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Hi Steve,
Yes as Chris said your swing beams should be loose enough to swing freely, especially the rear one, which will help with displacing the wieght of your bow as you winch or power your rib on, also offering a much better angle of approach, otherwise you would be putting a lot of pressure on those first two rollers, of course this wouldn't matter if you could always guarantee the ideal depth, often I'm faced with having to power or winch on, so having all the rollers forced to face in, and beam forced to face out helps loads, to get those rollers facing in you need some short lengths of tough bungie.
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Old 12 November 2013, 11:22   #10
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Quote:
Originally Posted by Dragonhawk ficht View Post
Hi Steve,
Yes as Chris said your swing beams should be loose enough to swing freely, especially the rear one, which will help with displacing the wieght of your bow as you winch or power your rib on, also offering a much better angle of approach, otherwise you would be putting a lot of pressure on those first two rollers, of course this wouldn't matter if you could always guarantee the ideal depth, often I'm faced with having to power or winch on, so having all the rollers forced to face in, and beam forced to face out helps loads, to get those rollers facing in you need some short lengths of tough bungie.
Thanks for this. Yes sorry I should have posted a picture earlier.

I shall attack the swingarm pivots at the weekend. I can't see any replaceable parts available on the internet for these pivots- no nylon bushes or washers to replace are there? (new split pin of course)

The photo of the bungee is good - I will do something similar too. Thankyou.

I am looking forward to recovering the boat with a working swing arm and without the irritating misaligned dumbells!

Thanks all.
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