Seats - structural, or ?

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natec
Posts: 3
Joined: 23 Sep 2019, 14:06

Seats - structural, or ?

Post by natec » 04 Nov 2019, 12:32

Good morning,

I'm the happy owner of a new-to-me Alumacraft boat. According to the title it is a 1974, 15' - however the coast guard plate is missing. I would like to remove one or both of the middle seats and I understand that I need to account for the flotation that would be removed.

I've read a number of great build threads on this site and was looking at different ways that folks have accounted for the lateral structural stability - however when I look at my seats (attached photo) it doesn't appear as though these benches are doing much to hold the sides of the boat rigid. Any thoughts or opinions are appreciated.

Nate
Seats.jpg

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jasper60103
Posts: 1226
Joined: 02 Jul 2009, 07:39
Location: Twin Cities, MN.

Seats - structural, or ?

Post by jasper60103 » 05 Nov 2019, 11:57

Nate, I'm sure you will hear opinions.
Welcome aboard and look forward to seeing your progress.
-jasper
natec wrote:
04 Nov 2019, 12:32
Good morning,

I'm the happy owner of a new-to-me Alumacraft boat. According to the title it is a 1974, 15' - however the coast guard plate is missing. I would like to remove one or both of the middle seats and I understand that I need to account for the flotation that would be removed.

I've read a number of great build threads on this site and was looking at different ways that folks have accounted for the lateral structural stability - however when I look at my seats (attached photo) it doesn't appear as though these benches are doing much to hold the sides of the boat rigid. Any thoughts or opinions are appreciated.

Nate

Seats.jpg
2018 Tracker Grizzly 1648
2018 30 HP Suzuki DF30A

CedarRiverScooter
Posts: 946
Joined: 13 Nov 2014, 08:01

Seats - structural, or ?

Post by CedarRiverScooter » 06 Nov 2019, 08:31

You could test for structural value by hanging the boat from 3 points, bow & transom corners. Measure the width between rub rails at the middle seat. Repeat after removing seat. If there is no change, you are good to go.

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onthewater102
Posts: 2148
Joined: 15 Mar 2014, 16:57
Location: CT

Seats - structural, or ?

Post by onthewater102 » 06 Nov 2019, 15:52

They serve to keep the sides from bowing out - here's a decent depiction of what I'm talking about that user Shaugh posted on a similar topic:

https://www.forum.tinboats.net/viewtopi ... ex#p457929

I doubt it matters much if you're not using an outboard with it.
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natec
Posts: 3
Joined: 23 Sep 2019, 14:06

Seats - structural, or ?

Post by natec » 07 Nov 2019, 18:31

CedarRiverScooter wrote:
06 Nov 2019, 08:31
You could test for structural value by hanging the boat from 3 points, bow & transom corners. Measure the width between rub rails at the middle seat. Repeat after removing seat. If there is no change, you are good to go.
Thanks - I will give this a try.

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