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Old 03 July 2018, 22:25   #1
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Sucking feeling while on plane

Just got my new Saturn SB518 out on the lake today. This boat is replacing my old FC470. When I get up on plane around 20 mph I get an undulating feeling in the floor kinda like it is being sucked down. I never had this feeling in the 470 but my new boat doesnít have speed tubes.
Any of you have that same feeling with boats without speed tubes?

Thank you
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Old 04 July 2018, 02:00   #2
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Is the inflatable keel up to pressure? Itís going to be pretty critical in an inflatable that size.
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Old 04 July 2018, 03:21   #3
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Yes this is something folks have experienced but usually with longer versions of air floor inflatables.

As JK says the keel inflation in particular will be critical at this size.... rechecked after a few mins on the water. Motor trim and load weight distribution might help a bit but the inflatable's design at this length is a huge factor.

I hope you get it sorted but it may just be a trade off for the fact that you can get seven Saturn 18s for one FC470.. something has to give in design/construction at that price difference.
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Old 04 July 2018, 05:40   #4
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as above make sure the fabric which forms the hull is ridgid that prevents air getting trapped causing the hull to go concave.
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Old 04 July 2018, 09:39   #5
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Iíll try upping the keel pressure today and let you all know if it works.
Thanks
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Old 04 July 2018, 11:22   #6
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Am I the only one that thought this was about the "Mile High" club when I saw the title
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Old 04 July 2018, 11:57   #7
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Quote:
Originally Posted by Pikey Dave View Post
Am I the only one that thought this was about the "Mile High" club when I saw the title
Maybe not.

Apparently I haven't yet gone entirely feral. Gimme a month...
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Old 04 July 2018, 13:19   #8
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Am I the only one that thought this was about the "Mile High" club when I saw the title
Nope, I thought sounds like a perfect set up to me
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Old 04 July 2018, 15:12   #9
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Am I the only one that thought this was about the "Mile High" club when I saw the title
Classic case of watching too many Carry On films during the 70s.
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Old 04 July 2018, 15:27   #10
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Hmmm I am sailing at over 5000 feet above sea level. Does that count
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