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Old 17 January 2013, 15:29   #11
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Well I reckon that simply hinging the seat at the front and letting the rear do the mitigation should work well enough. The fewer moving parts the better. Shroud the scissoring areas to prevent damage to flesh and/or clothing. The mounting points can be adjusted fore and aft to vary suspension rates. Would be quite cool actually, also the seat would still be able to hinge up to access the console from above if the sus. points are fitted with quick release spigots. Aluminium runners..........mmmm, very cool, a bit of anodising and it would look like quite a pro job.
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Old 17 January 2013, 16:17   #12
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mister p

i like the simplity of your design ie hinge at the front and the shock to ther rear of the seat
tsm
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Old 18 January 2013, 03:55   #13
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be aware that adjusting the angle of the spring/damper alters it efficiency, ie, if you had a damper rated at 100kg mounted at a 45degree angle, its rating would now be 50kg. its worth remembering also that doing this would increase the effective vertical travel of the seat.
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Old 18 January 2013, 09:29   #14
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Suspension seat design

The ulliman web page shows a trace for shock loadings in G forces.
Ullman Range 2013 - Ullman Dynamics - (Version JPG) - Page n 30 - Catalogue PDF | Documentation | Brochure de bateaux

See page 30.
It should be noted that the max G force experance by the Ribs is circa 12.5 G at Circa 45kn

Kenitic Energy is
KE = 0.5. M. Vel * vel
say mass is 1
then KE for the above mentioned graph is 0.5 *45*45 = 1012.5 units
for 23 kn the same boat has a KE of
KE = 0.5 *23*23 = 264.5 units or 26 % of the engergy of the boat at 45 kn.
It is a reasonable assumption that the Max G Force experance by that boat at 23 kn is 12.5 g *0.26 = 3.25 g

The max crusing speed of my boat is circa 23 kn (max speed circa 28-30 kn)

If I use the firgure of 3.25 G as max shock loading as a base figure for my boat at 23 kn. then the suspension seat must be able to support and deflect my weight of 90 kg by 3.25 G = 292.5 KG.
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Old 18 January 2013, 11:03   #15
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As must a sponge seat without shock protection.
You nicely tenderise a steak at 23 knots.
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Old 29 August 2017, 23:34   #16
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Would be interested to see what you came up with in the end TSM, do you have any pics?
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