Which Hull to Build

cb34

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flowers 33

Flowers 33=Calvin design=skeg design
 

cb34

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Best power for Flowers 33

What do you think? What motor would provide the optimal, efficient cruise speed at 20-22 knts
 

BillD

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25 Terry Jason with Cummins 370 power
What do you think? What motor would provide the optimal, efficient cruise speed at 20-22 knts

CB34,

The beautiful 33 Flowers bass boat (maineboatswest) has a QSB 5.9 480.
Reading the owners posts his 33 runs consistently @ 20-22 knots without beating on the engine.

By maineboatswest:

"not sure on the boat weight. its foam core hull and top, but i had flowers put in larger fuel tanks than normal (175 gallons each) but i almost never fill them up for just fishing day trips. the best guess i have is about 14000lbs light as measured on an old travelift that hauled me out last fall. the qsb is rated at 3400rpm, but I have it over-propped and only get about 3250 rpm out of it under normal conditions. I swing a 24x25 michigan DQX four blade with a ZF 2:1 reduction. normal cruise is 2550-2600 rpm at 65-70% load at 12 gals/hr. i never run more that 2700 rpm, so i tried to maximize my cruise speed by going with an over pitched wheel. I have a 7% downangle ZF gear, and that moved the engine back about 12-18"" from normal, and its a light weight engine, so the boat sits pretty high in the water as you can tell. hope that helps"

"i think the trick is keeping it light up front. its a narrow entry - great for running into the waves. i put 9' long lifting rails running from the stem aft about 12" below the waterline to give my bow more lift, about 1" wide. i picked up a little speed from it as well as it lifts the whole bow a little higher, and it makes it alot drier. keeping the weight aft will help. so far, the qsb is a great little engine. at times i wish i had put the qsc 600 in, but frankly the boat runs so nice at 21-22 knots in all seas, that it would be hard to justify the extra weight and fuel. I think the new 6.7 qsb will be great for you, but i havent seen the comparison to the 5.9. as will all these high rpm engines, they make most of their power in the last 400 rpm, but I can't think about running it that hard. I grew up commercial fishing in alaska, and a high rpm engine back then was a 3208T Cat that turned 2600rpm, so its hard to run these engines much above that.
I will try to get a video of it running at cruise. good luck, and let me know if i can help"

cb34,

I'd consider the new QSB 6.7 480 for power in a 33 Flowers. The new 6.7 has demonstrably better torque than the 5.9.

I will say I may have changed my engine choice for a new 33 Flowers.

There is a new 33 Flowers tuna boat being built now that will have QSC 8.3 500 power. Figure 23-24 knots conditions permitting 24/7.

The QSC 500 and the new QSB 6.7 480 are great engines.

Brian (Powderpro) put the QSC 500 in his 34 CB, boat ran 33 mph @ seatrail.

Can wait to see the run numbers on the new 33 Flowers QSC500 !

FWIW,

Bill D
 

cb34

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Qsc500

Is it worth the extra 500lbs and size.
 

F/V First Team

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Northern Bay 36 - Modified
I've been looking at the D-13

I might settle for an engine box on a 34 footer...

:rolleyes:

Also I am shocked that a larger displacement engine had more torque than it's smaller counter part, who would have thought?
 

mfrench808

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Calvin

I have been on neither hull but from an aesthetics point the calvin beal 34 looks so good - when done right the pilot house and hull are balanced. There is a 34 Calvin that was or is named the main squeeze in Montauk which has such nice lines on the boat. A big 34 foot boat as well. That boat would be worth looking.
 

plowin

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33' flowers
I would say yes if the owner did not want a 3000 rpm plus engine and was also interested in having an engine that was sleaved. The 6.7 is quite impressive on paper and has done well in trucks but its still a little early to tell for sure in the marine marketplace.IMHO
 

Muscie

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36 Flowers finished by Cape Island, 2014 ; 645 QSM11
me too, still wrestling w/ speed of Skeg v. comfort & maybe better sekeeping of Built down. I am wrestling between a 34 CB & a 35 duffy. Is there a correct answer? To further confuse I saw a nice 35 young bros.
 

BillD

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25 Terry Jason with Cummins 370 power
me too, still wrestling w/ speed of Skeg v. comfort & maybe better sekeeping of Built down. I am wrestling between a 34 CB & a 35 duffy. Is there a correct answer? To further confuse I saw a nice 35 young bros.

34 CB will be faster.
We ALL have Brian's (powderpro's) real numbers light and heavy seatrials with the 34CB/QSC 500 he built two years back.

05Bill repowered his 35 Duffy with a QSC 540 (same motor as 500).

He has some real seatrial data.

"what to do....what to do.......??????" :D
 

ledslingr

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ok guys, new to site, but am interested in a DE boat, 28-30 ft range. So if I want a boat that won't roll like my 27 Albermarle, I should think of a built down hull? 18-20 kt cruise is what were shooting for. What do you boys suggest.

We have been looking at the Seaworthy 28, and General Marine's 26. Up until I started reading these posts, I didn't know there was a difference between DE's
 

Muscie

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36 Flowers finished by Cape Island, 2014 ; 645 QSM11
I went through the same execise when I bouth my 28 Seaworthy. It had more beam, more HP, & more LOA, for roughly the same price. Plus, the hull is a Spencer Lincoln design built down hull. I run the boat at 18 knots in most conditions at 78% of max.
It the lousiest conditions I can still run at 15-16 knots very comfortably.
 

BillD

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25 Terry Jason with Cummins 370 power
ok guys, new to site, but am interested in a DE boat, 28-30 ft range. So if I want a boat that won't roll like my 27 Albermarle, I should think of a built down hull? 18-20 kt cruise is what were shooting for. What do you boys suggest.

We have been looking at the Seaworthy 28, and General Marine's 26. Up until I started reading these posts, I didn't know there was a difference between DE's

led,

nothing like a keel for of water under the hull to keep the rolling down !!!!
 

ledslingr

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ok thanx . you guys were talking about "rolling like a coke bottle" on this thread{ i think this thread} I've got enough of that now LOL. Builtdown = more stability?
 

Blitzen

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Flowers Boat Works 46 hull #1, Flowers Boat Works 36 hull #1, Wayne Beal 28 Hull #1, Repco 30 1968,
ok thanx . you guys were talking about "rolling like a coke bottle" on this thread{ i think this thread} I've got enough of that now LOL. Builtdown = more stability?

Look at the bottom of the hull you like, the more deadrise at the stern the more it will roll, as it will tend to roll to the degree of the deadrise. The 0 deadrise boats tend to be more stable.
 
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