Trojan Boat Forum

I have a strong desire to take out all the hull vents from my boat.
I will be making a set of molds to produce new vents.
Anyone done anything like this?

I like a carolina style look, just under rubrail following the shearline.
Most boats today get air thru hull vents and under the cockpit gunwales. I intend to do the same.
I would also like to pick up and dump air from all blowers and fans thru this area.
I think the F36 hull would look much nicer without all those holes and vents.

SRD

Jav made a real nice custom set for his boat

Thanks Paul,


Here's what I did.

Struts and Rudders wrote:I have a strong desire to take out all the hull vents from my boat.
I will be making a set of molds to produce new vents.
Anyone done anything like this?

I like a carolina style look, just under rubrail following the shearline.
Most boats today get air thru hull vents and under the cockpit gunwales. I intend to do the same.
I would also like to pick up and dump air from all blowers and fans thru this area.
I think the F36 hull would look much nicer without all those holes and vents.

SRD

Don't do it , you need away to get the gas fumes out . the boats you saw it on were diesels .Not to mention unless you buld a complex baffle system it will be noisey . But the danger is the main thing

Thanks for the photos and replies.

I have seen one done like I am discussing...it is in a boatyard in Wanchese NC right now. "Carolina Lady", I think she was recently towed down from Va.

I work in the boating industry and will be consulting with several builders that use gas engines in much tighter spaces.
I will address the safety concerns....gotta live to enjoy my efforts!
Safety is paramount concern of mine as well.
I also intend to do a par test to assure proper airflow after launch.

Thanks

Jav...yours did turn out very nicely!
Thanks for posting the close up.

"Most boats today get air thru hull vents and under the cockpit gunwales."

Find a gas boat made this way ,

I May add that the F36 has some station wagon effect , and all that nice warm wet salty air and exhust fumes ( from the exhust) will be sucked back in to the engine room ( and worst maybe the cabin ??) .

The F32 isn't all that different in terms of station wagon effect, which is why we always try to have a hatch or two cracked open while underway to allow airflow through the cabin and out the salon door to create a 'positive pressure zone' and alleviate (or at least significantly reduce) the back pressure. Of course if we are taking spray we close the hatches down, but get them open again as soon as we can to help ventilate before we get back to the dock.

ahem...."some"station wagon effect ?

makes me want to look at a Delta T system or something like that.

look at vertantis.com

follow to mist eliminators

removes up to 97% of salt and moisture from the air

That would solve one issue , but you still have to deal with the exhaust fumes getting sucked back into the engine room.

But all that is minor compared to gas fumes that will never leave the boat . Do you really want to take the risk ?? Think about it .

First I intend to measure all of the current air induction vents and go from there as to the amount of air that they can move at max speed.

The system will be designed to move more than twice the air as designed.
The fans can flow in either direction...to induce air or to evacuate air.

I did locate several boats built in the modern era with a system like what I intend....Carolina Classic is the best example of a high quality builder moving air as I intend to. Others like Silverton, Regal, Sea Ray just to list a few.

I truly believe that the current Trojan F36 set up would introduce quite a lot of back draft and introduce damp salt air into the entire hull due to the fact little was done to seal the cabins from the engine room area.

I will be working very hard to isolate air regions within the boat for several reason including safety, combustion induction and evacuation and sound.

Your still failing to address the issue of gas fumes . you can move 100 times the air as stock but if you venting it to the back deck and not out side the the hull the fumes will still be on board . Any good surveyor would black flag it.

gas fumes are heavier then air so fumes will end up back in the bilge .You have to get the fumes outside the hull


Some basic info http://www.uscgboating.org/regulations/ ... parta.aspx

I understand your concerns and point of view.
Thanks for expressing your opinion. That is what I am here for.

The engines and genset I am installing are fuel injected...thus reducing the potential of possible fumes related to evaporation in the carb systems of the past.

I will be beefing up the blower systems as well. Mechanically moving several times more air than originally designed will address all of the requirements.

I have strong feelings that the current system would not pass the modern regulation inspections in the first place. I will not be relying on movement of the boat or wind to clear my bilges of fumes...I will have a modern automatic system that will move WAY more air than required.

If not I guess you will read about me blowing up or of dying from carbon monoxide exposure....either way my boat will look like I want it to and I will have died a HAPPY man!

As to the station wagon effect...I intend to install the foils that Hatteras is using on their hardtop to reduce the effect.

Thanks for everyone's input...my mind is made up and I have consulted with engineers at several MAJOR builders that I have been working with for in excess of 15 years...all agree that effort will be required but the system will be safer and look way nicer.


I will post my photos or you will read about me in the news.....LOL