bertram31.com

Geebert

Carl wrote: ↑Aug 10th, '24, 07:27 I hear the Bayliss 31 is up for sale

Sorry had to say it

Really?
I thought someone would snap that right up.

Geebert

I guess it's already been asked, but why the "spare no expense" refit, only to turn around and attempt to recover the expense? I can see someone spending that kind of money because they want to keep the boat, or maybe to showcase their refit/restoration abilities. Being a bertram won't get you a mil...

Geebert

It looks like you tweaked the angel of the struts.
Did you change the shaft angle ?
Do you know what your clearance is between the bottom and the props?

Geebert

PeterPalmieri wrote: ↑Jun 10th, '24, 21:43 I shared these numbers on Facebook but want to put them here for the social media hold outs

34kts at 3080RPM
32kts at 2600RPM
28kts at 2400RPM

22-26 kts from 2100-2300

20x24 3 blade acmes, still very controllable around the dock.

What ratio are the transmissions?

Geebert

Bruce wrote: ↑May 21st, '24, 09:22 If you find yourself in the WestPalm area, let me know and I'll sit down with you if you'd like.
Done 18 31s. Cummins, yanmar, cat, gas, styer, gm diesel refits.

Standard hulls and prop pockets.

Pat and I did 5 together.

What would be your preferred set up ?

Geebert

There is an app called "fiverr" You can post what you want, and freelance creators and craftsmen can bid on building what you want. There's enough people with 3d printers and cnc machines around I'm sure you could have it done. May cost you, but I'd rather pay a lot for what i want, than a little fo...

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Sign up for a bill fish tournament with a new boat as the prize

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Slow blow fuses are available for this type of circuit protection. They'll blow quickly with a dead short, but can sustain brief overcurrent periods without blowing. Also be aware of ignition protected components only in any area fumes can accumulate. This includes fuses and fuse panels. Some are an...

Geebert

A 31 bertram in Arizona.
The sun literally never sets on the bertram empire

Geebert

Something i noticed that illustrates the "optimized" theory, If you look at the sheet with the 6lp, it has a "past power" section with 330 horse 454s similar gear ratio as the diesel. The 18x18 prop at the cruise rpm of 3200 is shown as about 72% efficient. Vs the diesel props 18x19, 89.4% efficient...

Geebert

My boat is a 1969 sport fish, weighs 10,320lbs with mercruiser 454s and full tank of fuel. No water.
I think i could hit 9,600lbs with about 30 gallons of fuel. Boat only no people.

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I guess he didn't like the 440 yanmars

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I can see it

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Tony Meola wrote: ↑Sep 26th, '23, 22:10 Take a good look at the bridge. It looks like a joy stick on the right. They move the camera too fast. It is hard to follow them.

Pretty sure that's a bow thruster
Agreed. Camera whips around too fast

Geebert

Expect the price of fuel to jump regardless.
The explanation is variable, the price increase is constant

Geebert

Yannis, We're facing the same predicament. I think we're even in similar climates. Im in SW Florida, would love to have a/c, and not excited about a generator. Definitely there's no putting out a lithium fire, ive seen that too. I guess this goes back to perspective and risk planning. If im offshore...

Geebert

The thing is I will never have the roof real estate of a trailer and, I have to come to terms with Li-Ion batteries. I fear spontaneous fire and some...bank account issues! Lead acid battery manufacturers have come together for mutual benefit, invested in R&D, have made advancements, and are contin...

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I think this came up in a previous discussion somewhere on here. My thinking on the matter for carbureted gas engines, is stainless hard line with flared nuts on the ends for the pressure side of the pump. On the suction side, rubber hose double clamped at joints, routed in such a way that siphoning...

Geebert

Not one dinghy joke?

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My rule of thumb is, if it floated when you pulled it out, it'll float when you put it back in.

Geebert

There should be enough data points on here to make a good guess. Ive compared a lot of them myself, and they're all really similar, if you account for the the difference of rpm, gear ratio, and tip speed. There's a lot of "magic" surrounding props because there are so many variables. I also believe ...

Geebert

Where is the season open already?

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Thanks for the reminders. Whenever i hear about stuff like this, it dose stick with me, and is in the back of my mind when im doing my pre trip checks. One point to mention I've learned over the years, unless you have an in tank pump, part of the fuel system is under suction or vacuum up to the lift...

Geebert

Wow.
Your old throttles must have been really heavy.

Geebert

It sounds like you guys operate in some pretty treacherous waters. Bob Lico says he put race car steering in his boat in case he needs to do a 90 at full cruising speed, to dodge some flotsam or jetsam. Worst I've ever seen is manatees, sand bars, idiots on jet ski's, idiots on boats. The first 2 yo...

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Todd, There is a lots of info available on the INET and also from the manufacturers. Most of the manufacturers are not selling to the marine industry. The battery people are selling to anyone that will buy their products. Its been my experience that tech support sucks for all products. There have b...

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The max distance recommended is just 7' and that was with 4/0 battery cables. 2/0 is the smallest recommended cable size. Now this was a shock to me! I'd discussed my arrangement with several very knowledgeable folks and while we all shared the concerns mentioned above we all though the system woul...

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Am i the only one that can't see the pics?

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If you dont top it off, will it continue to deplete?
Or will it stabilize at that lower level ?

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Here's a photo shopped sedan with upper station like i mentioned.
Looks like they raise the roof line also.

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Ironworker wrote: ↑Mar 29th, '23, 16:56 Thanks Carl. It is somewhat complicated and likely will be the most technologically advanced 31 in the country when she's complete.

That's a tall order, how many ball valves will that take ?

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thanks all. Yannis, one of the carrots I used to incentivize the wife was A/C in the cabin. I do want to try to incorporation marine friendly sound attenuation into the ceiling and interior upholstery as well. As far as the seating position, the bridge location vs cabin helm don't appear to be too ...

Geebert

Dont know about engines, but trannys are plentiful these days. I heard there was a bunch at the CMA's Nice boat. I kinda wanted the sedan myself, and just put a tube frame second station/crows nest on the roof, but i ended up with a sportfish in my price range and didn't want to wait anymore. Good l...

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DanielM wrote: ↑Mar 28th, '23, 17:16

My sweet bride has put up with my boat silliness for 42 years and counting. Mostly she’s pretty good natured with the broke-azz boats I drag up at my shop

19 years for us.
At this point i can only conclude it's one of my traits she finds attractive about me.

Geebert

IVECO was or is a Cummins based engine. I remember looking at them, and when I repowered, the owner of ExtremeDiesel.com had his boat next to mine and they were putting Iveco's in his boat. When I asked the dealer about them, he said they were pretty much Cummins, and for the owner of the boat is w...

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Found it. Let me know if the link doesn't work. https://www.hydrocompinc.com/wp-content/uploads/documents/MP-Aug-Sep14_Powertalk.pdf someday maybe when I have time for pure personal fun...I'll put together a test platform (AKA- Cool boat) to test each individual variable to compare hoping one day, m...

Geebert

Dont know of anyone that's installed it, but to widen your search, i think the mercury diesel 6.7 is the same engine, just rebranded.
If so, searching the mercury may turn up more results.

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Im sure there's an argument here, we just haven't found it yet. The chart does not apply universally to all craft. It is limited to normal planing hulls, like bertrams, makos, shamrocks, with submerged props. The article was targeted toward inboard power so outboards would certainly have a different...

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Alright Carl, i see you've come out swinging(a big prop) I think with so many variables being changed at once, trying to pinpoint any one item as being the reason for performance gain is nothing more than a crap shoot. How was that for stirring the pot on the 1st day of Spring?? We agree on that Car...

Geebert

https://i.imgur.com/iAjWeHF.jpeg This is a tip speed graph. I dont remember where i got it from. Seems like it was an article written by a Naval Architect or engineer, making the point of the importance of proper gear ratio/prop diameter selection. It is not universal for every application. It was ...

Geebert

I've read Dave Gerr (Naval Architect) book on propeller sizing and deisgn. He recommends maximizing diameter and using cup if you cant fit enough diameter. Still pondering this issue, but 25% slip seems way to high. When I rebuilt my onboard mako, I was able to get the slip down to 9% at cruise. Ga...

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Another factor to consider that is often, if not entirely overlooked, is tip speed. There is a limit to what rpm you can spin a given size propeller before it starts to eat more power to turn, than it generates in thrust. With gas engines(high cruise rpm) , 1.5 trans, and 18" prop, you're near if no...

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I think a set of sharrow props for outboards are in the range of 5k. It would probably be cheaper to do a diesel repower then buy a set of sharrow props for inboards. What about a diesel repower AND sharrow props. With all the fuel you'll save, it'll pay for itself by the year 2089 Btw, i bought an...

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If you want guaranteed improvement and have money to spend, call sharrow marine and order a set.
Id love to know how they'll do on a bertram.

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I thought he said the address had changed?

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Good questions. This boat is being set up for extended fishing trips in the far Bahamas. I may go for several days in the southern Bahamas without access to amenities while swinging on the hook. In addition to the battery bank, I can carry 345 gallons of fuel. It will have the lithium House battery...

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I bet that unicorn raft met 90% of what he wanted in a boat

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Big cockpit, cabin forward, a row of motors aft...it kinda loses the openness of a sportfish. If openness is the right word for sportfish. I guess its a time of reinventing what boats are. Early "sport fishing" boats were all sedan/cruiser types.Then someone decided to look from a higher vantage po...

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Your progress is inspirational. Im looking forward to your finished product, and shake down. What are all the loads you're planning to operate from the battery bank? And how are you handling charging ? What voltage will the battery bank be ? I cant find safety tests on battle born's website, do you ...

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https://www.facebook.com/marketplace/it ... tid=6ojiHh

Thought id pass this along if anyone is interested.
Says he's got cummins optional with it.

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