Reply
 
Thread Tools Search this Thread Display Modes
 
Old 09-22-2017, 11:23 PM   #1
Senior Member
 
Oldersalt's Avatar
 
City: San francisco
Country: USA
Vessel Name: Pacific Star
Vessel Model: 1990 Grand Banks 32 #834
Join Date: Jun 2016
Posts: 141
8 People on Fly Bridge?

My GB 32 weighs, all up, close to 20,000 pounds. Next month, during the SF Fleet Week air show, I will have a total of 8 people on the boat, including me.
SF Bay can get a bit windy and bumpy, and I remember reading of a few cases where powerboats capsized, apparently due to top-heavy overloading. 8 adult Americans probably weigh a total of over 1,500 pounds

So, may have your knowledge and/or thoughts about whether or not I need to limit the number of people on the fly bridge?

Thanks in advance.
Oldersalt
__________________
Advertisement

Oldersalt is offline   Reply With Quote
Old 09-23-2017, 01:38 AM   #2
TF Site Team
 
City: Brisbane
Country: Australia
Vessel Name: Now boatless - sold 6/2018
Vessel Model: Had a Clipper (CHB) 34
Join Date: Jun 2008
Posts: 7,183
Send a message via Skype™ to Peter B
Quote:
Originally Posted by Oldersalt View Post
My GB 32 weighs, all up, close to 20,000 pounds. Next month, during the SF Fleet Week air show, I will have a total of 8 people on the boat, including me.
SF Bay can get a bit windy and bumpy, and I remember reading of a few cases where powerboats capsized, apparently due to top-heavy overloading. 8 adult Americans probably weigh a total of over 1,500 pounds

So, may have your knowledge and/or thoughts about whether or not I need to limit the number of people on the fly bridge?

Thanks in advance.
Oldersalt
Definitely, you do. My boat is bigger than yours and weighs 11tonne = 11,000 kg = 24,200 ibs, yet the official Queensland (Australia) Maritine Safety sticker on the windscreen says no more than 3, repeat, 3, on the fly-bidge. There is a formula somewhere you could try Googling. Sorry, a fair number will need to just stay below.
__________________

__________________
Pete
Peter B is offline   Reply With Quote
Old 09-23-2017, 01:59 AM   #3
Master and Commander
 
markpierce's Avatar
 
City: Vallejo CA
Country: USA
Vessel Name: Carquinez Coot
Vessel Model: penultimate Seahorse Marine Coot hull #6
Join Date: Sep 2010
Posts: 11,152
It is likely occupying the flybridge will be uncomfortable due to lots of rocking, particularly if anchored. Deck-level occupation will be more enjoyable. Why the need to be seven-feet taller when the airplanes will be at least a thousand feet above? A flybridge is an annoyance in typical SF waters. Regardless, why have everyone on the flybridge anyway? Reach up and touch??
__________________
Kar-KEEN-ez Koot
markpierce is offline   Reply With Quote
Old 09-23-2017, 06:11 AM   #4
Guru
 
boomerang's Avatar
 
City: Kilmarnock VA
Country: united states
Vessel Name: YellowBird MMSI 367769170
Vessel Model: 1978 Mainship m1 #149
Join Date: Apr 2016
Posts: 527
Quote:
Originally Posted by markpierce View Post
It is likely occupying the flybridge will be uncomfortable due to lots of rocking, particularly if anchored. Deck-level occupation will be more enjoyable. Why the need to be seven-feet taller when the airplanes will be at least a thousand feet above? A flybridge is an annoyance in typical SF waters. Regardless, why have everyone on the flybridge anyway? Reach up and touch??
Ummm...why would everyone want to be on the flybridge? For the very reason they were designed in the first place; to get a better view!
I'm detecting a little flybridge envy here.
__________________
-Shawn-
boomerang is offline   Reply With Quote
Old 09-23-2017, 06:12 AM   #5
Guru
 
hfoster's Avatar
 
City: Cleveland
Country: USA
Join Date: Mar 2012
Posts: 531
I would say yes 8 people would be to much.


With 8 people on the fly bridge that is a great deal of weight that would be moving around.


Mark, brings up a good point!


Cheers.


H.
hfoster is offline   Reply With Quote
Old 09-23-2017, 06:28 AM   #6
Curmudgeon
 
BaltimoreLurker's Avatar
 
City: Stoney Creek, MD
Country: USA
Vessel Name: Moon Dance
Vessel Model: 1974 34' Marine Trader Sedan
Join Date: Oct 2007
Posts: 2,757
I'm not a marine architect and I didn't stay at a Holiday Inn last night. But I'd say this - It's like the question of, "When should I reef my main?"
Answer, "When it first crosses your mind."

Your gut's telling you 8 is too many. You're probably right.
BaltimoreLurker is offline   Reply With Quote
Old 09-23-2017, 06:44 AM   #7
Guru
 
firstbase's Avatar
 
City: Jupiter, Florida
Country: United States
Vessel Name: Black Eyed Susan
Vessel Model: Grand Banks 42' Classic
Join Date: Nov 2016
Posts: 1,208
Quote:
Originally Posted by boomerang View Post
I'm detecting a little flybridge envy here.
Oh geez....no....please no.... here comes the flybridge/no flybridge thread...

firstbase is offline   Reply With Quote
Old 09-23-2017, 07:03 AM   #8
Guru
 
City: North Charleston, SC
Country: USA
Join Date: Sep 2010
Posts: 4,385
My boat is smaller than yours and used to have a decal limiting the flybridge to six people. The decal has faded away but that's irrelevant.

It's important to remember that "people" can vary greatly in weight. Also remember that sitting and all rushing to one side to see something can be two vastly different situations.

Eight people on the flybridge in a slip at a marina and eight people on the flybridge in an open bay are two different situations as well.

My opinion; don't do it. Put them in the cockpit or on the foredeck.
rwidman is offline   Reply With Quote
Old 09-23-2017, 07:23 AM   #9
Guru
 
jleonard's Avatar
 
Join Date: Jun 2008
Posts: 3,284
I don't think it would be a real problem. I've had more than that on the bridge of my old Mainship.
__________________
Jay Leonard
Attitude Adjustment
40 Albin
Mystic,Ct. /New Port Richey,Fl
jleonard is offline   Reply With Quote
Old 09-23-2017, 07:28 AM   #10
TF Site Team
 
City: Brisbane
Country: Australia
Vessel Name: Now boatless - sold 6/2018
Vessel Model: Had a Clipper (CHB) 34
Join Date: Jun 2008
Posts: 7,183
Send a message via Skype™ to Peter B
Quote:
Originally Posted by WesK View Post
My boat is smaller than yours and used to have a decal limiting the flybridge to six people. The decal has faded away but that's irrelevant.

It's important to remember that "people" can vary greatly in weight. Also remember that sitting and all rushing to one side to see something can be two vastly different situations.

Eight people on the flybridge in a slip at a marina and eight people on the flybridge in an open bay are two different situations as well.

My opinion; don't do it. Put them in the cockpit or on the foredeck.
Wes, I suspect that 6 people up on the fly-bridge of your boat, if smaller than the OP's, would be decidedly risky, as that is double that recommended for my 11tonne 34 footer. (see my post #2 above) Although I think the 'official' number of 3 for my boat is a bit conservative, and I would have no issue with 4 in smooth waters. But 8 on a 32 footer - no way.
__________________
Pete
Peter B is offline   Reply With Quote
Old 09-23-2017, 07:54 AM   #11
Guru
 
City: North Charleston, SC
Country: USA
Join Date: Sep 2010
Posts: 4,385
Quote:
Originally Posted by Peter B View Post
Wes, I suspect that 6 people up on the fly-bridge of your boat, if smaller than the OP's, would be decidedly risky, as that is double that recommended for my 11tonne 34 footer. (see my post #2 above) Although I think the 'official' number of 3 for my boat is a bit conservative, and I would have no issue with 4 in smooth waters. But 8 on a 32 footer - no way.
The sticker said six. I had five or six up there on a short "ride" on the AICW behind Myrtle Beach, SC. It's basically a canal there. And they were "small" people. The rest were on the foredeck.

Other than the sticker, it's a judgement call. There's no way I would put six up there in open water and there are times when even I go below to run the boat.

As the captain, you are responsible for everyone's safety.
rwidman is offline   Reply With Quote
Old 09-23-2017, 07:56 AM   #12
Guru
 
Join Date: Oct 2007
Posts: 800
8 people probably weigh in the region of 1,250-1,500lb vs boat of 20,000lb.
I think the risk you run is primarily that the boat becomes unstable because all 8 want to see the same event moment from exactly the same position on the boat. 1,500lb moving suddenly to one side would be enough (IMO) to rock the boat seriously. While this might well not be enough to cause a rollover/capsize, it could well be enough to throw unsuspecting (older/weaker?) people into the water. Then all hell will break loose!!
Chrisjs is offline   Reply With Quote
Old 09-23-2017, 08:16 AM   #13
Art
Guru
 
Art's Avatar
 
City: SF Bay Area
Country: USA
Vessel Model: Tollycraft 34' Tri Cabin
Join Date: Feb 2011
Posts: 9,356
Quote:
Originally Posted by Oldersalt View Post
My GB 32 weighs, all up, close to 20,000 pounds. Next month, during the SF Fleet Week air show, I will have a total of 8 people on the boat, including me.
SF Bay can get a bit windy and bumpy, and I remember reading of a few cases where powerboats capsized, apparently due to top-heavy overloading. 8 adult Americans probably weigh a total of over 1,500 pounds

So, may have your knowledge and/or thoughts about whether or not I need to limit the number of people on the fly bridge?

Thanks in advance.
Oldersalt

If you had a 50' boat with 15' beam then the FB would probably be spacious enough to comfortably [and safely] accommodate up to 8 people max. But you don't. In your case, I believe four persons should be max for many reasons. Have the passengers alternate position in boat.
Art is offline   Reply With Quote
Old 09-23-2017, 08:27 AM   #14
Art
Guru
 
Art's Avatar
 
City: SF Bay Area
Country: USA
Vessel Model: Tollycraft 34' Tri Cabin
Join Date: Feb 2011
Posts: 9,356
Quote:
Originally Posted by markpierce
It is likely occupying the flybridge will be uncomfortable due to lots of rocking, particularly if anchored. Deck-level occupation will be more enjoyable. Why the need to be seven-feet taller when the airplanes will be at least a thousand feet above? A flybridge is an annoyance in typical SF waters. Regardless, why have everyone on the flybridge anyway? Reach up and touch??


Quote:
Originally Posted by boomerang View Post
Ummm...why would everyone want to be on the flybridge? For the very reason they were designed in the first place; to get a better view!
I'm detecting a little flybridge envy here.
I believe Mark would feel uncomfortable on a flying bridge. The unobstructed 360į sky-view and the complete bow to transom corners boat view for Mark seems to go past his plate of desires. Obviously due to his statement: "... flybridge will be uncomfortable due to lots of rocking, particularly if anchored." He enjoys stable footings while aboard a boat. Unfortunately boats have natural tendency to move around a bit. that's why you get what's called your "Sea Legs!"

Why he mentions... "A flybridge is an annoyance in typical SF waters. Regardless..." is a complete wonder to me. I'd like to hear Mark expound a bit on that remark. Mark - FB being "an annoyance in typical SF waters" - What do you really mean???
Art is offline   Reply With Quote
Old 09-23-2017, 08:34 AM   #15
Senior Member
 
danderer's Avatar
 
City: Newark, DE
Country: US
Vessel Name: Sojourner
Vessel Model: 2006 Mainship 34T
Join Date: Jan 2015
Posts: 373
Name:  IMG_4568.JPG
Views: 813
Size:  12.8 KB

From our 20k lbs 39 ft boat


We've done around this many at the dock but I wouldn't out on the water.
danderer is offline   Reply With Quote
Old 09-23-2017, 08:36 AM   #16
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 19,008
8 folks up top would not bother me at all.

I would watch the movement of the folks and ask they would not all rush to a rail at once.

With the open viewing area , nothing would be gained by charging from side to side .

Sea conditions would count. The extra weight up top would slow the roll , but it would go further.

I think the folks would abandon the area as the roll became a PIA , when they had to hang on.

Be observant , but it should be a nothingburger.
FF is offline   Reply With Quote
Old 09-23-2017, 08:39 AM   #17
TF Site Team
 
Bay Pelican's Avatar
 
City: Chicago, IL
Country: USA
Vessel Name: Bay Pelican
Vessel Model: Krogen 42
Join Date: Oct 2007
Posts: 2,994
15 years ago I checked with Krogen's architect and the weight limit for the upper deck was 750 lbs before stability was affected. I have frequently violated this limit (the dinghy, motor, gas and spares etc on the upper deck alone are 350 lbs) when at anchor in calm waters, but not underway.
__________________
Marty
Bay Pelican is offline   Reply With Quote
Old 09-23-2017, 09:24 AM   #18
Guru
 
City: Carefree, Arizona
Country: usa
Vessel Name: sunchaser V
Vessel Model: DeFever 48
Join Date: Apr 2008
Posts: 7,785
A few years ago a Silverton rolled over on the East Coast during a fireworks display due to too many people on the fly bridge. A similar incident occurred off Vancover Island recently when a whale watching vessel rolled over. Lives were lost in both cases.

Ferries roll over when passengers rush to one side with alarming frequency. Up top weight transfer to a lower location during blue water cruising is normal procedure. Think moment arm. Sailing racers grasp the placement of weight, see all those bodies on the high side?

In SF Bay an unsettling stray current wave can appear pretty quickly. Especially when the skipper is watching airplanes.
sunchaser is offline   Reply With Quote
Old 09-23-2017, 10:36 AM   #19
Guru
 
City: Satsuma FL/Daytona Beach Shores
Country: United States
Vessel Name: No Mo Trawla
Vessel Model: Hurricane SS188
Join Date: Jul 2014
Posts: 2,102
Why don't you call your insurance agent?
__________________
Buffalo Bluff Light 28
Donsan is offline   Reply With Quote
Old 09-23-2017, 10:41 AM   #20
Art
Guru
 
Art's Avatar
 
City: SF Bay Area
Country: USA
Vessel Model: Tollycraft 34' Tri Cabin
Join Date: Feb 2011
Posts: 9,356
Perhaps I'm incorrect with this thought... but, in a general engineering sense... it seems to me:

Regarding same length boat...


Fairly wide waterline berth, hard chine planning hull shape would have less "roll-over" tendency that a more narrow waterline berth, soft chine full displacement hull shape.
__________________

Art is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 07:08 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012