Re: [bolger] Bunny - R Lobster Boat/ Construction method and Wood types

"Bruce Hallman <bruce@...> wrote:
> The engine, well not quite sure at the moment,

I notice that Bolger's 'Bunny R' used a 6 cylinder Ford truck
engine, which I presume was salvaged from a wrecking yard."

Yes, Bruce, that sound right, I remember reading in Wooden Boat # 77 that I bought as a back issue to get more info on the design that the original "Bunny R" used a Ford 6 cyl. Gasoline Truck engine. If I'm right I think these engines put out about 90HP(I've seen other work boat designs in old magazines with these engines specified as having 90HP).

With a gasoline engine of this output you'd only have to run it at 1/3 - 1/2 revs to get 8.5 knots, and being a 6cyl. it'd be quite smooth and very quiet compared to a diesel, running at low rpm s.

Hugo Tyson, Launceston, Tasmania, Australia.


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[Non-text portions of this message have been removed]
Projected total cost of the complete "Bunny R" lobster boat will be around $35,000 (AuD), about $27,000 USD. Professionally built,here in Australia I would imagine you'd be looking at about $150,000+ AuD, maybe even as high as $200,000.Aud, given the hourly rate of $50 per hour. Thankfully for my brother and I that we've got a very talented and generour father!

Hugo Tyson <hhetyson@...> wrote:Bruce,

When construction starts on our "Bunny R" Lobsterboat my father will build her by the strip-plank method on molds, so steam-bent frames won't be neccessary.Care will have to be taken though to get a fair shape due to the 3' centres on the molds, but my father is very experienced with this method of construction and has built 2 largish small craft with strip-planking,namely "Merlin" 21' 3" x 7'10" ("Marina Cruiser" BWAOM) and "Beluga" 30' x 8'4" ("Romp" design from "Different Boats), not to mention a 13' 6" Bolger designed "Recreational Rowing Boat"(Folding Schooner book) and "Dolly-T" a "Harbinger" catboat, also from the "Folding Schooner" book.

She'll be epoxy saturated. With the strip-plank method ribs aren't entirely essential due to the almost monocoque nature of this construction. We will put ribs in though for added strength, but space them further apart than shown in the plans for the carvel construction shown on the plans.

The backbone/keel and other structural timbers will be made from Tasmanian Oak (a very hard and strong hardwood) while the planking will be 7/8" thick Celery-Top pine (A fairly dense,"hard" soft wood with good rot resistance), the ribs will be laminated from Celery-Top Pine, maybe with alternating layers of "Blackwood" a Tasmanian hardwood with a very dark colour and beautiful grain structure, not that you'll see it in the ribs! Fastenings will be marine grade stainless steel, while the nails for the planking will be silicon-bronze boat nails (anchorfast?).

The engine, well not quite sure at the moment, but Nanni Diesel have two models that would be very suitable, a 50HP 4cylinder diesel and a 62HP 5 cylinder diesel. Since my brother and I are financing this project, we'll probably opt for the larger 62 HP 5 cyl. model, which should have an excess of power, so that It can be run at reduced revs, get good fuel economy, be quiter and smoother (5 cyl. has to be smoother than a 4 cyl. ?) and have enough power to push the boat to her maximum speed of about 11 knots in just about any sea/wind condition!
Nanni Diesels are based on Kubota Diesel Tractor engines and are fully marinised with heat exchanger fresh water cooling. Another plus about these Nanni diesels is that they develop their power at lower revs than, say a Yanmar diesel of similar power output. The 62 HP Nanni (2.8 Litre) gets maximum power at 2800 rpm whereas the Yanmar 56HP and 75HP 4cyl. (2.0 Litre) diesels get their maximum power at 3800 rpm or thereabouts!

Remember this design is an "Inshore" Lobsterboat so Bolger didn't design her to plane. He says in the book "30 Odd Boats" that this type of Lobster Boat hull is best at around 8 - 8.5 Knots cruising speed and will top out at about 11 knots, maybe squatting her stern down a bit!

For a semi displacement hull of the same size and weight that is capable of planing it would need between 180-300 HP to get decent speeds(20+ knots), which would mean a far more expensive to buy and run diesel engine and for our intended use wouldn't really be justified!

Bolger is still in the process of designing for me "Silver Blaze" a 26' x 6' 6'' "Torpedo-stern" Inboard runabout(based apon the "Snow Leopard" concept in BWAOM) . I haven't heard how the design is coming along, but this will be the craft to go fast in! She'll be the next project after our "Bunny R" is finished, hopefully in a Year to I hope no longer than 18 months!

Hugo Tyson, Launceston, Tasmania, Australia.

Bruce Hallman <bruce@...> wrote:
> Bunny R/Laura B - 28' x 10' Lobster boat
> Hugo Tyson, Launceston, Tasmania, Australia.

Thanks Hugo, I am still curoius if your father plans
to build with planks on bent frames, or by another
framing method. If with steam bent frames, I am curious
which type of wood is used in Tasmania? As, probably,
in Tasmaina [as in California] green sticks of Eastern
White Oak are scarce.





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



Bolger rules!!!
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- 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]
> The engine, well not quite sure at the moment,

I notice that Bolger's 'Bunny R' used a 6 cylinder Ford truck
engine, which I presume was salvaged from a wrecking yard.
Bruce,

When construction starts on our "Bunny R" Lobsterboat my father will build her by the strip-plank method on molds, so steam-bent frames won't be neccessary.Care will have to be taken though to get a fair shape due to the 3' centres on the molds, but my father is very experienced with this method of construction and has built 2 largish small craft with strip-planking,namely "Merlin" 21' 3" x 7'10" ("Marina Cruiser" BWAOM) and "Beluga" 30' x 8'4" ("Romp" design from "Different Boats), not to mention a 13' 6" Bolger designed "Recreational Rowing Boat"(Folding Schooner book) and "Dolly-T" a "Harbinger" catboat, also from the "Folding Schooner" book.

She'll be epoxy saturated. With the strip-plank method ribs aren't entirely essential due to the almost monocoque nature of this construction. We will put ribs in though for added strength, but space them further apart than shown in the plans for the carvel construction shown on the plans.

The backbone/keel and other structural timbers will be made from Tasmanian Oak (a very hard and strong hardwood) while the planking will be 7/8" thick Celery-Top pine (A fairly dense,"hard" soft wood with good rot resistance), the ribs will be laminated from Celery-Top Pine, maybe with alternating layers of "Blackwood" a Tasmanian hardwood with a very dark colour and beautiful grain structure, not that you'll see it in the ribs! Fastenings will be marine grade stainless steel, while the nails for the planking will be silicon-bronze boat nails (anchorfast?).

The engine, well not quite sure at the moment, but Nanni Diesel have two models that would be very suitable, a 50HP 4cylinder diesel and a 62HP 5 cylinder diesel. Since my brother and I are financing this project, we'll probably opt for the larger 62 HP 5 cyl. model, which should have an excess of power, so that It can be run at reduced revs, get good fuel economy, be quiter and smoother (5 cyl. has to be smoother than a 4 cyl. ?) and have enough power to push the boat to her maximum speed of about 11 knots in just about any sea/wind condition!
Nanni Diesels are based on Kubota Diesel Tractor engines and are fully marinised with heat exchanger fresh water cooling. Another plus about these Nanni diesels is that they develop their power at lower revs than, say a Yanmar diesel of similar power output. The 62 HP Nanni (2.8 Litre) gets maximum power at 2800 rpm whereas the Yanmar 56HP and 75HP 4cyl. (2.0 Litre) diesels get their maximum power at 3800 rpm or thereabouts!

Remember this design is an "Inshore" Lobsterboat so Bolger didn't design her to plane. He says in the book "30 Odd Boats" that this type of Lobster Boat hull is best at around 8 - 8.5 Knots cruising speed and will top out at about 11 knots, maybe squatting her stern down a bit!

For a semi displacement hull of the same size and weight that is capable of planing it would need between 180-300 HP to get decent speeds(20+ knots), which would mean a far more expensive to buy and run diesel engine and for our intended use wouldn't really be justified!

Bolger is still in the process of designing for me "Silver Blaze" a 26' x 6' 6'' "Torpedo-stern" Inboard runabout(based apon the "Snow Leopard" concept in BWAOM) . I haven't heard how the design is coming along, but this will be the craft to go fast in! She'll be the next project after our "Bunny R" is finished, hopefully in a Year to I hope no longer than 18 months!

Hugo Tyson, Launceston, Tasmania, Australia.

Bruce Hallman <bruce@...> wrote:
> Bunny R/Laura B - 28' x 10' Lobster boat
> Hugo Tyson, Launceston, Tasmania, Australia.

Thanks Hugo, I am still curoius if your father plans
to build with planks on bent frames, or by another
framing method. If with steam bent frames, I am curious
which type of wood is used in Tasmania? As, probably,
in Tasmaina [as in California] green sticks of Eastern
White Oak are scarce.





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[Non-text portions of this message have been removed]
> Bunny R/Laura B - 28' x 10' Lobster boat
> Hugo Tyson, Launceston, Tasmania, Australia.

Thanks Hugo, I am still curoius if your father plans
to build with planks on bent frames, or by another
framing method. If with steam bent frames, I am curious
which type of wood is used in Tasmania? As, probably,
in Tasmaina [as in California] green sticks of Eastern
White Oak are scarce.
Yes Bruce,
you are right, there are lines plans you could build from in "30 Odd Boats" for a 32' x 11' x 3' 2"? Inshore type Lobster Boat which is very very similar to "Bunny R/ Laura B".No construction details are shown though, eg. scantlings for the timbers and planking.
She's the bigger sister of "Bunny R" and displaces approx. 1400lbs more.

As Bolger says in the chapter in "30 Odd boats" on the Lobster Boat (That's the name of the design) Royal Lowell's Book "Boat Building Down East" is the definitive work if you want to build a Lobster Boat, while the book has very detailed drawings and explanations as well as construction details, no buildable plans are actually published in the book. While there are lines plans and construction details for several boats, no tables of offsets are given!

I suppose one could enlarge the lines plans to 3/4" : 1' and scale of the offsets, but I suppose there are bound to be errors due to the small scale drawings!

Hugo Tyson, Launceston, Tasmania.

Hugo Tyson, Launceston, Tasmania.

Bruce Hallman <bruce@...> wrote:
> Bunny R/Laura B - 28' x 10' Lobster boat plans are in Harold Paysons "Boat >section. She's also featured in a Wooden Boat from about 3 years ago detailing
>about 20 or so Bolger round bottomed designs from the past 50 years of his
>designing. The articles called "Classical Bolger". Sorry but I can't
remember the
>magazine's Issue #.
> Hugo Tyson, Launceston, Tasmania, Australia.


That would be the issue of Wooden Boat #164 Jan/Feb 2002

Anybody care to share a copy, online or off?


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
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[Non-text portions of this message have been removed]
> Bunny R/Laura B - 28' x 10' Lobster boat plans are in Harold Paysons "Boat >section. She's also featured in a Wooden Boat from about 3 years ago detailing
>about 20 or so Bolger round bottomed designs from the past 50 years of his
>designing. The articles called "Classical Bolger". Sorry but I can't
remember the
>magazine's Issue #.
> Hugo Tyson, Launceston, Tasmania, Australia.


That would be the issue of Wooden Boat #164 Jan/Feb 2002

Anybody care to share a copy, online or off?
Bunny R/Laura B - 28' x 10' Lobster boat plans are in Harold Paysons "Boat Modelling- the easy way" As well as being able to build the model by the lift method, the full plans of this boat are published so you can build the full size one if you like. Also Wooden Boat Issue #77 Has a review of this design in the designs section. She's also featured in a Wooden Boat from about 3 years ago detailing about 20 or so Bolger round bottomed designs from the past 50 years of his designing. The articles called "Classical Bolger". Sorry but I can't remember the magazine's Issue #.

Hugo Tyson, Launceston, Tasmania, Australia.

Bruce Hallman <bruce@...> wrote:
Oops, Lobsterboat is featured in Chapter 25 of Bolger's book
_30-Odd Boats_.

> Couldn't find a lobster boat or a bunny r in BWAOM. Which design are
> you refering to?


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



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[Non-text portions of this message have been removed]
Oops, Lobsterboat is featured in Chapter 25 of Bolger's book
_30-Odd Boats_.

> Couldn't find a lobster boat or a bunny r in BWAOM. Which design are
> you refering to?
Bruce,

Couldn't find a lobster boat or a bunny r in BWAOM. Which design are
you refering to?

Thanks.
> I just thought I'd let you know that a start has been made on our latest project, a Phil Bolger designed "Bunny-R" lobsterboat.
>
> She's 28' 0" x 10' 0'' x 2' 9''.

The one in Boats With An Open Mind is 32' x 11',
so is yours a 10% scaledown? Also, she appears to be
build with steam bent ribs, do you plan to use that
too? If so, what is your source for green wood?
Hi everyone,

I just thought I'd let you know that a start has been made on our latest project, a Phil Bolger designed "Bunny-R" lobsterboat.

She's 28' 0" x 10' 0'' x 2' 9''.

My father has just about finished drawing up the lines and construction details full size so construction will probably start within the next month!

He's got to tidy-up his catboat (Dolly-T) a Bolger "Harbinger" design in the next two weeks to be ready for the Australian (Hobart, Tasmania) Wooden Boat Show which he's taking her to.

Hugo Tyson, Launceston, Tasmania, Australia.



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