RE: [bolger] Re: Some questions about Diablo and buoyancy

Thanks Hector, Lincoln and Mark,

You have been very helpful and especially the formulas have helped a lot.
The pdf doc on
<http://www.uscg.mil/d8/mso/louisville/WebStuff/comdtpubp16761_3b.pdf>
http://www.uscg.mil/d8/mso/louisville/WebStuff/comdtpubp16761_3b.pdf

Has been very helpful and has many other factors one needs to consider like
power to weight etc.

Regards

Marius
Cape Town
South Africa
www.minds.co.za


_____

From: Bruce Hector [mailto:bruce_hector@...]
Sent: Saturday, June 26, 2004 6:56 PM
To:bolger@yahoogroups.com
Subject: [bolger] Re: Some questions about Diablo and buoyancy


--- Inbolger@yahoogroups.com, Mark <marka@h...> wrote:"If ever
completely flooded, a Diablo will float bow down. Up under the bow
seat is a logical place to start for more. For more, a boxed in
midship thwart."

On my Diablo "Diabla", as all boats should be named after females, I
added an air chamber under a decked in bow for extra bouyancy
forward.

Photos under Bolger designs, Diable on my site at:

http://www.brucesboats.com/

Don't know how she'd float flooded as I've never swamped her.

Bruce Hector



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[Non-text portions of this message have been removed]
Nicely put. This shows I've been thinking about this backwards.

To test, I sliced up a 1/4" sheet of 4 x 8 plywood into a block .66 a cubic foot. Say
that displaces 40 pounds of water. Minus the sheet's own 25#, net positive buoyancy is 15
pounds, about half again more, not less. Applying the USCG guidelines conversion factor
for fir plywood of .81, though, gives credit for only about 5 pounds per sheet.

So that in their 75 pound dinghy example, for true positive flotation the flotation
material displaces water just about equal to the net weight of the boat. Guess they want
you floating _high_ in the water if possible.

Thanks,
Mark


>http://www.uscg.mil/d8/mso/louisville/WebStuff/comdtpubp16761_3b.pdf

Lincoln Ross wrote:

> For example, a 122cm X 244 cm sheet of 6mm ply weighing 10 kilograms
> will displace about 8 kilograms more than its own weight when under
> water. (not sure what size your metric ply sheets are)
If working in the metric system, each cubic centimeter of volume
displaces 1 gram of fresh water. Handy, isn't it? If you want to know
the net bouyancy, subtract the weight of the sheet from the displacement
you get. But of course if the wood gets soaked it's not as good. I bet
the particular country's rules say something about this.

For example, a 122cm X 244 cm sheet of 6mm ply weighing 10 kilograms
will displace about 8 kilograms more than its own weight when under
water. (not sure what size your metric ply sheets are)
--- Inbolger@yahoogroups.com, Mark <marka@h...> wrote:"If ever
completely flooded, a Diablo will float bow down. Up under the bow
seat is a logical place to start for more. For more, a boxed in
midship thwart."

On my Diablo "Diabla", as all boats should be named after females, I
added an air chamber under a decked in bow for extra bouyancy
forward.

Photos under Bolger designs, Diable on my site at:

http://www.brucesboats.com/

Don't know how she'd float flooded as I've never swamped her.

Bruce Hector
Being just half the density of water, when the boat is flooded, wood floats about 50% of
its own dead weight.
A sheet of 1/4" fir weighs roughly 25 pounds; 3/8" just under 40; 1/2", 50 pounds.
Count the boat's sheets without worrying about the trims to get the total hull weight.

The four cubic feet of foam shown on the plans is enough to support 248 pounds; minus the
8 pounds the foam itself weighs. If ever completely flooded, a Diablo will float bow down.
Up under the bow seat is a logical place to start for more. For more, a boxed in midship thwart.

This USCG pub, 'Safety Standards for Backyard Builders,' goes step by step and very
plainly on all the math for placing foam flotation.
http://www.uscg.mil/d8/mso/louisville/WebStuff/comdtpubp16761_3b.pdf

BW,
Mark


marsminds wrote:
> what the formula or method is for determining the buoyancy value of
> the plywood?
Thanks Guys,
I appreciate the answers and advise from Jim, Hugo, Paul and Roger.

I have a more faith in the little boat now. I have some good
conversion programs, the point was that if someone had done it
before and worked out the wrinkles while actually building a metric
version it may save some problems. What I did not consider as it was
pointed out to me, a mm is very small compared to inches and being a
mm or 2 off is not a hassle since the epoxy likes a little filling
space.

I also read somewhere about shetting the inside hull with foam to
improve buoyancy. That may save the usual foam filled spaces as
packing and fishwell spaces.

My problem is still since I'm marthamatically severely challenged,
what the formula or method is for determining the buoyancy value of
the plywood?

Thanks again guys, its nice to have knowledgable friends close at
hand!

Regards
Marius

Cape Town
South Africa

--- Inbolger@yahoogroups.com, findleyjh@e... wrote:
> Greeting All,
>
> > Just use 1cm plywood whereever the plans ask for 1/4inch plywood
> and
> > you'll make a sturdy boat that way...
>
> True enough, it would be sturdy! 6 or 7 mm would be much closer
to
> plan.
>
> Since folks mentioned conversion tools, I thought I'd mention
> something I use quite regularly...google. Google has a built in
> calculator (among other tools), and the calculator has a built in
> converter. [I also highly recommend the google toolbar for your
> browser.]
>
> Complete information - for those interested - can be found at the
> following two links:
>
>http://www.google.com/help/index.html(for the calculator etc)
>
>http://toolbar.google.com(for the toolbar)
>
> Cheers,
> Jim
Greeting All,

> Just use 1cm plywood whereever the plans ask for 1/4inch plywood
and
> you'll make a sturdy boat that way...

True enough, it would be sturdy! 6 or 7 mm would be much closer to
plan.

Since folks mentioned conversion tools, I thought I'd mention
something I use quite regularly...google. Google has a built in
calculator (among other tools), and the calculator has a built in
converter. [I also highly recommend the google toolbar for your
browser.]

Complete information - for those interested - can be found at the
following two links:

http://www.google.com/help/index.html(for the calculator etc)

http://toolbar.google.com(for the toolbar)

Cheers,
Jim
Hi Hugh,

Thanks a lot, that puts my mind to ease, I am so used to very deep V or Cat
(24 to 28 ft) powerboats that are heavy (fibreglass), that building this
feather light little boat worried me a bit.

The advantages of the light weight and the design seemed attractive to me as
I could tow it on a lightweight trailer, and easily launch it by myself or
with the wife.

I have had it with large heavy twin engined fishing boats. They are
expensive to buy and even more expensive to run and maintain, talk about big
black holes. Never mind the drama to launch.... You always have to have a
few "mates" around. This seems like a nice easy launching boat that we can
quickly launch an go fishing without too much drama. Also I am lately more
inclined to stay about 2 miles offshore where the fish actually are!

Thanks again!

Marius

Marius Lubbe
Creative MindsR HQ
Cape Town, South Africa
Phone: 082 785 7763
www.minds.co.za


________________________________________________________________________
________________________________________________________________________

Message: 14
Date: Thu, 24 Jun 2004 23:18:04 +1000 (EST)
From: Hugo Tyson <hhetyson@...>
Subject: Re: Some questions about Diablo and buoyancy

Hi Marius,

The Diablo is a good design and can handle chop and swells quite well so I'm
sure it would be suitable for bay fishing.

As to buoyancy, my Diablo has both stern seats filled with foam buoyancy
which should float her in case of a serious accident. She has a 25 HP
Mercury outboard (New when boat was launched) and can do about 30 Knots(
about 50KMpH ).

My brother punished a few people in her by taking them out in really rough
weather and treated them to a severe ride round the islands in the mouth of
the small estuary at Port Sorell where we mainly use her. The water was
really quite rough, so pounding a Diablo at about 25 Knots into a stiff chop
is quite a good test of the boats capabilities. The visitors who had made a
few desultory remarks about Tasmania and Tasmanians in general soon learnt
that Mainland Australians aren't so smart after all, as ther impact damaged
bums probably told them the next day!!(Damaged I may add from the hard seats
and no other reason, this is not New York or Rio or Sydney). So a word of
advice, take some cusions or build padding into the seats, especially the
middle and bow thwarts if you expect to do some hi-speed rough water work!
Of course the helmsman with a tiller controlled outboard, sitting in the
stern rarely feels half the impact that anyone sitting on the forward seats.

HugoTyson, Launceston, Tasmania, Australia.

Marius_Lubbe_-_Creative_MindsR_HQ <marius@...> wrote:
Hi Guys,

I am on the point of starting a Diablo as a first project. I have been
dreaming of this for years, but I am finally getting up the nerve to take my
ten thumbs and try to create something special for myself.

Point 1. I have to work in metric as I really do not understand inches and
such. If anyone has already done the conversion from inches to mm it will
really save me some time.

Point 2. We have a law in South Africa requiring us to build a certain
amount of buoyancy into a boat. I need to work out how much the wood
contributes to this, and have to take pictures as I build, to prove to the
authorities that the wood is in there as buoyancy. I would like to get most
of the buoyancy from the material or add to the hull as I would like to keep
the seating and other spaces open for storage and a fish well for bait fish.

Point 3.
Have anybody some experience of this boat in the open sea, I would like to
take it for bay fishing, our swells here run to about 1 meter (1 yard I
guess) high on average.

Thanks guys!

Marius



[Non-text portions of this message have been removed]



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________________________________________________________________________
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Message: 15
Date: Thu, 24 Jun 2004 23:33:27 +1000 (EST)
From: Hugo Tyson <hhetyson@...>
Subject: Re: Some questions about Diablo and buoyancy

Even the Helmsman (Dominic Tyson) was surprised when she(Diablo) launched
herself airborn,(He)cut the throttle and landed broadside on to the chop
and stopped dead(The boat!), but that was the worst, or best of it depending
apon your outlook on such matters. She actually jumps waves quite well. I
reckon she could easily handle 40-50HP, as long as one wasn't too
adventurous in rough conditions. Bolger is fairly conservative in his
maximum power rating of 24HP Maximum. I know that the Diablo design will do
about 40 Knots with a old and heavy 1955 mercury 40HP Motor as I read about
it on a website so it must be true?!!.

Hugo Tyson, Launceston, Tasmania, Australia.

Hugo Tyson <hhetyson@...> wrote:
Hi Marius,

The Diablo is a good design and can handle chop and swells quite well so I'm
sure it would be suitable for bay fishing.

As to buoyancy, my Diablo has both stern seats filled with foam buoyancy
which should float her in case of a serious accident. She has a 25 HP
Mercury outboard (New when boat was launched) and can do about 30 Knots(
about 50KMpH ).

My brother punished a few people in her by taking them out in really rough
weather and treated them to a severe ride round the islands in the mouth of
the small estuary at Port Sorell where we mainly use her. The water was
really quite rough, so pounding a Diablo at about 25 Knots into a stiff chop
is quite a good test of the boats capabilities. The visitors who had made a
few desultory remarks about Tasmania and Tasmanians in general soon learnt
that Mainland Australians aren't so smart after all, as ther impact damaged
bums probably told them the next day!!(Damaged I may add from the hard seats
and no other reason, this is not New York or Rio or Sydney). So a word of
advice, take some cusions or build padding into the seats, especially the
middle and bow thwarts if you expect to do some hi-speed rough water work!
Of course the helmsman with a tiller controlled outboard, sitting in the
stern rarely feels half the impact that anyone sitting on the forward seats.

HugoTyson, Launceston, Tasmania, Australia.

Marius_Lubbe_-_Creative_MindsR_HQ <marius@...> wrote:
Hi Guys,

I am on the point of starting a Diablo as a first project. I have been
dreaming of this for years, but I am finally getting up the nerve to take my
ten thumbs and try to create something special for myself.

Point 1. I have to work in metric as I really do not understand inches and
such. If anyone has already done the conversion from inches to mm it will
really save me some time.

Point 2. We have a law in South Africa requiring us to build a certain
amount of buoyancy into a boat. I need to work out how much the wood
contributes to this, and have to take pictures as I build, to prove to the
authorities that the wood is in there as buoyancy. I would like to get most
of the buoyancy from the material or add to the hull as I would like to keep
the seating and other spaces open for storage and a fish well for bait fish.

Point 3.
Have anybody some experience of this boat in the open sea, I would like to
take it for bay fishing, our swells here run to about 1 meter (1 yard I
guess) high on average.

Thanks guys!

Marius



[Non-text portions of this message have been removed]



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Bolger rules!!!
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- Pls add your comments at the TOP, SIGN your posts, and snip away
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Great little software!!!
Good link

--- Inbolger@yahoogroups.com, Paul Hughes <paulbear22@y...> wrote:
> Click on the link. I use this all the time. Great freeware.
http://www.joshmadison.com/software/convert/
>
>
> ---------------------------------
> Do you Yahoo!?
> Yahoo! Mail - 50x more storage than other providers!
>
> [Non-text portions of this message have been removed]
Great little software!!!
Good link

--- Inbolger@yahoogroups.com, Paul Hughes <paulbear22@y...> wrote:
> Click on the link. I use this all the time. Great freeware.
http://www.joshmadison.com/software/convert/
>
>
> ---------------------------------
> Do you Yahoo!?
> Yahoo! Mail - 50x more storage than other providers!
>
> [Non-text portions of this message have been removed]
Click on the link. I use this all the time. Great freeware.http://www.joshmadison.com/software/convert/


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[Non-text portions of this message have been removed]
Marius,

Being from Old Europe, I had to adjust to the imperial system
myself. It's really not that big of a deal... However, just to help
you out, here are a few conversions...

1 meter = 100 cm
1 yard = 3 feet = roughly 93 cm
1 foot = 12 inches = 30 cm (Actually it's almost closer to 31cm...)
1 inch = 2.5 cm
1/2 inch = 1.25 cm
1/4 inch = 0.675 cm

I don't have it exactly in front of me but I know 1 inch is really
2.53973 cm (or close to that number...) so that's why 1 yard is an
odd number like 92 or 93 cm...

I wouldn't worry too much of being exact right down to the mm
(millimeter) since 1mm is 1/25th of an inch...! :-)
Just use 1cm plywood whereever the plans ask for 1/4inch plywood and
you'll make a sturdy boat that way...
Good luck! Send some pictures as soon as you take them!

Roger



--- Inbolger@yahoogroups.com, Marius Lubbe - Creative MindsR HQ
<marius@c...> wrote:
> Hi Guys,
>
> I am on the point of starting a Diablo as a first project. I have
been
> dreaming of this for years, but I am finally getting up the nerve
to take my
> ten thumbs and try to create something special for myself.
>
> Point 1. I have to work in metric as I really do not understand
inches and
> such. If anyone has already done the conversion from inches to mm
it will
> really save me some time.
>
> Point 2. We have a law in South Africa requiring us to build a
certain
> amount of buoyancy into a boat. I need to work out how much the
wood
> contributes to this, and have to take pictures as I build, to
prove to the
> authorities that the wood is in there as buoyancy. I would like to
get most
> of the buoyancy from the material or add to the hull as I would
like to keep
> the seating and other spaces open for storage and a fish well for
bait fish.
>
> Point 3.
> Have anybody some experience of this boat in the open sea, I would
like to
> take it for bay fishing, our swells here run to about 1 meter (1
yard I
> guess) high on average.
>
> Thanks guys!
>
> Marius
>
>
>
> [Non-text portions of this message have been removed]
>
> Point 1. I have to work in metric as I really do not
> understand inches and
> such. If anyone has already done the conversion from
> inches to mm it will
> really save me some time.
>

Phil Bolger is a Metric System booster. It is possible
that the plans are available in Metric units. Susanne
is well versed in the land of Metric.

(So, Fax PB&F and ask...)

Phil Smith
Even the Helmsman (Dominic Tyson) was surprised when she(Diablo) launched herself airborn,(He)cut the throttle and landed broadside on to the chop and stopped dead(The boat!), but that was the worst, or best of it depending apon your outlook on such matters. She actually jumps waves quite well. I reckon she could easily handle 40-50HP, as long as one wasn't too adventurous in rough conditions. Bolger is fairly conservative in his maximum power rating of 24HP Maximum. I know that the Diablo design will do about 40 Knots with a old and heavy 1955 mercury 40HP Motor as I read about it on a website so it must be true?!!.

Hugo Tyson, Launceston, Tasmania, Australia.

Hugo Tyson <hhetyson@...> wrote:
Hi Marius,

The Diablo is a good design and can handle chop and swells quite well so I'm sure it would be suitable for bay fishing.

As to buoyancy, my Diablo has both stern seats filled with foam buoyancy which should float her in case of a serious accident. She has a 25 HP Mercury outboard (New when boat was launched) and can do about 30 Knots( about 50KMpH ).

My brother punished a few people in her by taking them out in really rough weather and treated them to a severe ride round the islands in the mouth of the small estuary at Port Sorell where we mainly use her. The water was really quite rough, so pounding a Diablo at about 25 Knots into a stiff chop is quite a good test of the boats capabilities. The visitors who had made a few desultory remarks about Tasmania and Tasmanians in general soon learnt that Mainland Australians aren't so smart after all, as ther impact damaged bums probably told them the next day!!(Damaged I may add from the hard seats and no other reason, this is not New York or Rio or Sydney). So a word of advice, take some cusions or build padding into the seats, especially the middle and bow thwarts if you expect to do some hi-speed rough water work! Of course the helmsman with a tiller controlled outboard, sitting in the stern rarely feels half the impact that anyone sitting on the forward seats.

HugoTyson, Launceston, Tasmania, Australia.

Marius_Lubbe_-_Creative_MindsR_HQ <marius@...> wrote:
Hi Guys,

I am on the point of starting a Diablo as a first project. I have been
dreaming of this for years, but I am finally getting up the nerve to take my
ten thumbs and try to create something special for myself.

Point 1. I have to work in metric as I really do not understand inches and
such. If anyone has already done the conversion from inches to mm it will
really save me some time.

Point 2. We have a law in South Africa requiring us to build a certain
amount of buoyancy into a boat. I need to work out how much the wood
contributes to this, and have to take pictures as I build, to prove to the
authorities that the wood is in there as buoyancy. I would like to get most
of the buoyancy from the material or add to the hull as I would like to keep
the seating and other spaces open for storage and a fish well for bait fish.

Point 3.
Have anybody some experience of this boat in the open sea, I would like to
take it for bay fishing, our swells here run to about 1 meter (1 yard I
guess) high on average.

Thanks guys!

Marius



[Non-text portions of this message have been removed]



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[Non-text portions of this message have been removed]



Bolger rules!!!
- no cursing, flaming, trolling, spamming, or flogging dead horses
- stay on topic, stay on thread, punctuate, no 'Ed, thanks, Fred' posts
- Pls add your comments at the TOP, SIGN your posts, and snip away
- Plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA, 01930, Fax: (978) 282-1349
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[Non-text portions of this message have been removed]
Hi Marius,

The Diablo is a good design and can handle chop and swells quite well so I'm sure it would be suitable for bay fishing.

As to buoyancy, my Diablo has both stern seats filled with foam buoyancy which should float her in case of a serious accident. She has a 25 HP Mercury outboard (New when boat was launched) and can do about 30 Knots( about 50KMpH ).

My brother punished a few people in her by taking them out in really rough weather and treated them to a severe ride round the islands in the mouth of the small estuary at Port Sorell where we mainly use her. The water was really quite rough, so pounding a Diablo at about 25 Knots into a stiff chop is quite a good test of the boats capabilities. The visitors who had made a few desultory remarks about Tasmania and Tasmanians in general soon learnt that Mainland Australians aren't so smart after all, as ther impact damaged bums probably told them the next day!!(Damaged I may add from the hard seats and no other reason, this is not New York or Rio or Sydney). So a word of advice, take some cusions or build padding into the seats, especially the middle and bow thwarts if you expect to do some hi-speed rough water work! Of course the helmsman with a tiller controlled outboard, sitting in the stern rarely feels half the impact that anyone sitting on the forward seats.

HugoTyson, Launceston, Tasmania, Australia.

Marius_Lubbe_-_Creative_MindsR_HQ <marius@...> wrote:
Hi Guys,

I am on the point of starting a Diablo as a first project. I have been
dreaming of this for years, but I am finally getting up the nerve to take my
ten thumbs and try to create something special for myself.

Point 1. I have to work in metric as I really do not understand inches and
such. If anyone has already done the conversion from inches to mm it will
really save me some time.

Point 2. We have a law in South Africa requiring us to build a certain
amount of buoyancy into a boat. I need to work out how much the wood
contributes to this, and have to take pictures as I build, to prove to the
authorities that the wood is in there as buoyancy. I would like to get most
of the buoyancy from the material or add to the hull as I would like to keep
the seating and other spaces open for storage and a fish well for bait fish.

Point 3.
Have anybody some experience of this boat in the open sea, I would like to
take it for bay fishing, our swells here run to about 1 meter (1 yard I
guess) high on average.

Thanks guys!

Marius



[Non-text portions of this message have been removed]



Bolger rules!!!
- no cursing, flaming, trolling, spamming, or flogging dead horses
- stay on topic, stay on thread, punctuate, no 'Ed, thanks, Fred' posts
- Pls add your comments at the TOP, SIGN your posts, and snip away
- Plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA, 01930, Fax: (978) 282-1349
- Unsubscribe:bolger-unsubscribe@yahoogroups.com
- Open discussion:bolger_coffee_lounge-subscribe@yahoogroups.com


Yahoo! Groups SponsorADVERTISEMENT
var lrec_target="_top";var lrec_URL = new Array();lrec_URL[1] = "http://us.ard.yahoo.com/SIG=129706ic9/M=296967.5106131.6227187.3294649/D=groups/S=1705065791:HM/EXP=1088147999/A=2196952/R=0/id=flashurl/SIG=1304ck1na/*http://www.sodaclubusa.com/referrer.asp?redirect=rv_boat_camp.asp&referrer=0002_0015_0178_0002";var link="javascript:LRECopenWindow(1)";var lrec_flashfile = 'http://us.a1.yimg.com/us.yimg.com/a/so/sodaclub/hm_ad_300x250_1.swf?clickTAG='+link+'';varlrec_altURL = "http://us.ard.yahoo.com/SIG=129706ic9/M=296967.5106131.6227187.3294649/D=groups/S=1705065791:HM/EXP=1088147999/A=2196952/R=1/id=altimgurl/SIG=1304ck1na/*http://www.sodaclubusa.com/referrer.asp?redirect=rv_boat_camp.asp&referrer=0002_0015_0178_0002";var lrec_altimg = "http://us.a1.yimg.com/us.yimg.com/a/so/sodaclub/alternate_320x250_061504.jpg";varlrec_width = 300;var lrec_height = 250;

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---------------------------------
Find local movie times and trailers on Yahoo! Movies.


[Non-text portions of this message have been removed]
Hi Guys,

I am on the point of starting a Diablo as a first project. I have been
dreaming of this for years, but I am finally getting up the nerve to take my
ten thumbs and try to create something special for myself.

Point 1. I have to work in metric as I really do not understand inches and
such. If anyone has already done the conversion from inches to mm it will
really save me some time.

Point 2. We have a law in South Africa requiring us to build a certain
amount of buoyancy into a boat. I need to work out how much the wood
contributes to this, and have to take pictures as I build, to prove to the
authorities that the wood is in there as buoyancy. I would like to get most
of the buoyancy from the material or add to the hull as I would like to keep
the seating and other spaces open for storage and a fish well for bait fish.

Point 3.
Have anybody some experience of this boat in the open sea, I would like to
take it for bay fishing, our swells here run to about 1 meter (1 yard I
guess) high on average.

Thanks guys!

Marius



[Non-text portions of this message have been removed]