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Old 01 March 2005, 12:03   #1
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Ullman Seats

Here is my Ullman Compact seats with the new fundament.
Ready for shipping to Tornado. Cant wait to test them !



Roy
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Old 01 March 2005, 12:09   #2
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Very Smart

They look superb, should be very comfortable with the suspension system in them. Very hi tec.
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Old 01 March 2005, 12:15   #3
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Look very nice
One thing, put your finger in one of those holes when you are bouncing up & down & I ges it will chop it wright off!
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Old 01 March 2005, 12:46   #4
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I'm not questioning Ullman's design but I would've done the linkage bit the other way around.

Imagine the person on the seat staying where they are and the boat moving underneath (as it should). At present the boat will move up and FORWARD. With the linkage the other way around, the boat will move up and BACKWARDS.

Surely up and backwards is better...I'm applying principles used when designing mountain bike rear suspension, but essentially its the same.

I'm sure Ullman know what they are doing but would be interested to hear people's views.

EDIT: the linkage only allows the boat to tilt bow down transom up...if you see what I mean. With the linkage the other way around the boat could tilt bow up transom down, which is obviously more natural.

Cheers

Tim
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Old 01 March 2005, 15:29   #5
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Nope, I don't.

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Old 01 March 2005, 15:44   #6
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Ok, here we go. This is my best shot at trying to explain it.

The blue arrow indicates the direction at which I think the boat would move if the seat stayed where it was. I'm thinking that this allowable movement is un-natural to the movement the boat will actually make when hitting waves at speed (it will want to go up and back...like a mountain bike wheel hitting bump in a track when travelling at speed). The green arrows show how the hull would naturally pivot with this linkage (kind of). Pink arrow just shows that the shock can only compress, from its fully extended position...obviously.

Does that explain what I'm on about? Am I talking sense or is it all crap?

Sorry about going slightly off topic RibRoy, perhaps JK can start a new thread.

Great looking seats by the way!

Cheers

Tim
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Old 01 March 2005, 15:51   #7
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Quote:
Originally Posted by slimtim
Does that explain what I'm on about? Am I talking sense or is it all crap?
Actually that does make sense, but would the console in this case keep getting shoved towards you as in theory you and the seat would not move but the Rib would move towards you....... not you've got me at it too so "Am I talking sense?"
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Old 01 March 2005, 16:02   #8
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woohoo! Someone who almost agrees!

I think in this case, the console would effectively seperate from you slightly (how much depends on the starting angle of the linkage). If it was the other way around the console would appear to come towards you (ie the boat would move backwards underneath you).

Imagine a set of front suspension forks on a mountain bike. When you hit a bump (similar I think to a RIB hitting waves) the line at which the front wheel axle takes is up and back (because the forks at angled backwards). This, i think is roughly the ideal path for the axle to take. So you can model the bike wheels as the hull etc and the rider/bike frame as the helmsman/seat cushion on the RIB.

The actual movement of that linkage I have drawn could be pretty complex depending on the sea movement etc, but I reckon it would absorb bumps better with the link the other way around. As I said before, I'm sure Ullman know what they are doing so there must be a good reason why they have done it like that. Any ideas anyone?

Cheers

Tim
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Old 01 March 2005, 16:05   #9
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As you hit a wave the bow comes up, pushing you back & down (or boat comes up) this will compress the spring Will it not!
Think what happens when you are say standing up holding on as you hit a wave, you are forced back & down (or the boat is coming up so feels like you are!)
Still think the holes are bloody dangerous!
Nick
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Old 01 March 2005, 16:06   #10
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RibRoy,

I've just noticed, do the seats rely on flex in two carbon fibre plates instead of beams and linkages? It looks that way from the pics...very interesting, no pivots to maintain/seaze.

Tim
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