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Old 27 January 2007, 18:32   #41
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Trouble is Mat, you'd think someone was sitting on him if spacehoppers where used .
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Old 28 January 2007, 02:03   #42
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So how much movement should a seat have? 200mm?
There seem to be two approaches to suspension seating: the Ullman-style jockey seats, or more conventional bucket seats.

For jockey seats then long travel might be important so that you can still use your legs to assist. With bucket seats I'm not convinced that long travel suspension is important though (in fact it might even be a hindrance), providing there the suspension efficiently absorbs the impact energy.

A completely different approach might be to incorporate something like Sorbothane or Astrosorb as used in Forcefield Body Armour into the seat mountings.

John
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Old 28 January 2007, 04:28   #43
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Or even use Engine mountings to mount the seat base to, will give about 5mm of movement.

Like these:
http://www.tradekey.com/product_view/id/43006.htm
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Old 28 January 2007, 04:59   #44
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Thanks for all of the replies some really useful comments

I also found these, similar thing to what has been mentioned

http://www.capitalseating.co.uk/prod...&appid=46&rid=

The bucket seats are presently pedestal mounted so I am wondering whether anybody makes a replacement pedestal part which contains some form of damping arrangement.

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Old 28 January 2007, 05:21   #45
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Something like this

http://ridesoftly.com/default.htm

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Old 28 January 2007, 06:42   #46
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....With bucket seats I'm not convinced that long travel suspension is important though (in fact it might even be a hindrance), providing there the suspension efficiently absorbs the impact energy.
Would you like to explain your reasoning, JK?
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Old 28 January 2007, 09:38   #47
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I'm thinking mainly of race-type seats in a fast boat, but it may apply in other cases too. I'd want to keep my body in a fairly consistent position relative to the controls and not be bouncing wildly up and down. If the energy can be effectively absorbed with the minimum of vertical travel, then so much the better.

Of course this opens up the discussion to how long is long, and how fast is fast.

Long travel suspension is important in cars and bikes that go over rough terrain because they need to keep the wheels in contact with the ground. I'm not sure that the same principles apply to boat seats.

What fundamental benefits do you see in long suspension travel for seats?

John
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Old 28 January 2007, 09:47   #48
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sorry i didnt get time to mess with my tractor today. had to ride a horse.
its my job. i will try again tomorrow but trust me its the same seat.
it has an adjustable damper and about 8 inches of forward/backward movement wish i had kept the box.
i have found the invoice and it was closer to 60 quid and it didnt fall off any lorrys.
and it stands up very well to the weather (no cab on that tractor) after 5 years use it looks the same as th day i put it on
I don't think a tractor seat is likely to be suitable for two reasons: the shock loading from a powerboat banging into a head sea is going to be very different to a tractor bumping over a field; also something that withstands the weather in normal use often fares much less well when exposed salt water.

At that price it would probably be worth someone giving it a try though.

John
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Old 28 January 2007, 09:58   #49
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However I want to replace the bucket seat with some form of suspension seat. I am aware of Ullman Jockeys which I am sure are very effective and equally as expensive.

Are there any alternatives to consider, if not I will bite the bullet and buy an Ullman seat if it keeps her safe from injury.
Whilst it's good to see that more options are appearing on the market, going back to your specific application I would be very wary of most of them as they do little more than lull you into a false sense of security. They might be useful for a bit of added comfort, but I wouldn't want to rely on them in your situation.

Assuming your wife is generally fit, then the most practical answer would probably be to fit jockey seats and for your wife to stand up rather than sit at all. If that's not an acceptable option, then I'd suggest the Ullman seats (actually I'd probably suggest seriously considering whether a RIB was actually a good idea).

Bucket seats with suspension may seem to be a good idea, but if they work well then you will tend to use the boat harder, because it's fun. At the point where you come off a wave just that bit harder than the suspension can handle, a damaged back is going to become very vulnerable.

Not knowing the details of you wife's back condition, I would definitely suggest that you get medical advice on what the likely outcome of a harder than planned landing might be, and take that into account too.

John
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Old 28 January 2007, 13:24   #50
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Of course this opens up the discussion to how long is long, and how fast is fast.

Long travel suspension is important in cars and bikes that go over rough terrain because they need to keep the wheels in contact with the ground. I'm not sure that the same principles apply to boat seats.

So you don't think it's important to keep ones backside in contact with the seat at all time then?

My the way John, I thought I'd tell you. Martin hasn't got a RIB, it's a largish Cruiser. I think the Ideal solution for Martin would be to try the tractor seat bases that Clice can supply. At 60 it's a cheap enough gamble. I for one would be interested if it works.
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