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HHH 35 catboat - Hull no 9

Old 06-11-2021, 04:30 AM
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Congrats Mark, she’s looking great so far.

I walked a 37 Inv the other day and they had a unique “vent” built into their 3 piece poly enclosure. An easy way to get some breeze with little effort. I’ll probably ask Heath to try and incorporate something similar into my 3 piece once my number is ready.

I can send you a picture if you’d like. Drop me a PM with your cell number and I’ll text it to you.

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Old 06-11-2021, 04:52 AM
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I can't recall seeing any fuel burn numbers from the blue HHH that had twin 300 v8's. Someone mentioned it hit 60mph but what about cruising speed and fuel burn at cruise?
Old 06-11-2021, 06:36 AM
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Question: If they are trying to keep the weight down why do they add foam? Safety? Sound dampening?

beautiful boat.
Old 06-11-2021, 12:46 PM
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Originally Posted by 196YWHB View Post
Congrats Mark, she’s looking great so far.

I walked a 37 Inv the other day and they had a unique “vent” built into their 3 piece poly enclosure. An easy way to get some breeze with little effort. I’ll probably ask Heath to try and incorporate something similar into my 3 piece once my number is ready.

I can send you a picture if you’d like. Drop me a PM with your cell number and I’ll text it to you.
Hey JP thank you and would love it. I think you have my number already.

Because I am a dinosaur and don't realize that there are two 16" displays that will show not only a heading (in very large type) but a picture of it as well, we've asked Hinkley to furnish the boat with a compass. Because of the stand thru, we'll have to move the enclosure in front of the pipework so that we don't kick the compass. That means the enclosure will have to be modified so ideas (that work) are very much appreciated. Shoot me a photo or post it up. THT'ers are always looking for good ideas and Invincible is a great company as well as a top candidate in our search.

You had asked if we would be mounting a trolling motor on ours and though we are not, rcoshane did and I'm sure would love to give you some input on it including battery layout, experiences with it so far, etc. Give him a quick shout. Don't believe anything they tell you about him, he's a good guy ...
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Old 06-11-2021, 01:24 PM
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Originally Posted by laythewood View Post
Question: If they are trying to keep the weight down why do they add foam? Safety? Sound dampening?

beautiful boat.
Hey LT. Thank you for the complement. Hinkley could do worse than to have his boat mentioned in the same conversation with your Conch. Time will tell...

Though Hinkley is interested in keeping weight as low as possible, I don't think that is his end game. Sound dampening was his primary concern in these void areas of the Hull. Safety was secondary, or incidental. Because the entire hull is cored I believe reverberation or vibration is kept to a minimum. I've only had a couple of rides on the boat so the true test, drift fishing while just standing there listening to the water, we've not done...

When I had asked him whether the boat would float if breached his answer was ...'nobody has sunk one yet to find out...'


Old 06-11-2021, 01:54 PM
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It's a beauty no doubt and built with a ton of foresight. I especially like the strong lightweight concept to be able to run well with twins. I like to run light most of the time.

The potential pitfall is if/when you try to load up such a big lightweight boat. I'm talking 8 guys with Bahamas gear/ ice/fuel. While the boat is big enough to fit everything comfortably, simple physics of pushing all the weight becomes an issue with twins??

With current power options I too would go with 300 V8s (to Heath's shagrin) simply for their low end torque to get the weight out of the hole and maintain it in a sea going slower. Beyond cost which is significant, the 450R V8s aren't the most efficient which turns me off as well. Maybe new V10 450s (coming next year fingers crossed) would solve this potential shortcoming?

My 30 Conch will run 65+ with 50 gallons of fuel, 1 person with twin 300 zukes. Load it up with a five guys and a Bahamas load and it responds much differently.
Old 06-11-2021, 02:00 PM
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Originally Posted by OakFord;14, 797764
I can't recall seeing any fuel burn numbers from the blue HHH that had twin 300 v8's. Someone mentioned it hit 60mph but what about cruising speed and fuel burn at cruise?
Oakford the numbers were pretty decent for a 35 ft cat. Checkout Knot Tight's thread below:

HHH Boatworks 35 cat build thread hull 007

On post #50 he was gracious enough to let us run his boat and those are some initial numbers. He reported some of his runs on posts 68, 81, and 83. I don't think he is through yet, meaning he wanted to change pitch and see what she would do.

On our run, cruise speed was 40.5 mph @ 4500 rpm getting 1.5 mpg. This was with 4 people, half tanks, and no gear...




Old 06-11-2021, 02:43 PM
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Originally Posted by AlreadyThere View Post
It's a beauty no doubt and built with a ton of foresight. I especially like the strong lightweight concept to be able to run well with twins. I like to run light most of the time.

The potential pitfall is if/when you try to load up such a big lightweight boat. I'm talking 8 guys with Bahamas gear/ ice/fuel. While the boat is big enough to fit everything comfortably, simple physics of pushing all the weight becomes an issue with twins??

With current power options I too would go with 300 V8s (to Heath's shagrin) simply for their low end torque to get the weight out of the hole and maintain it in a sea going slower. Beyond cost which is significant, the 450R V8s aren't the most efficient which turns me off as well. Maybe new V10 450s (coming next year fingers crossed) would solve this potential shortcoming?

My 30 Conch will run 65+ with 50 gallons of fuel, 1 person with twin 300 zukes. Load it up with a five guys and a Bahamas load and it responds much differently.
AT - from your mouth to God's ear...When those engines come out, I will contact your sons (because I know you don't give a shit about speed) and make them a deal on lightly used and well cared for Mercury 300R's that they can't refuse. I don't doubt they'll still be under warranty...As a preview, show them this picture, add about 3/4 mph, and bump up the fuel efficiency...

#timingiseverything #istillhave300morerpmtogo




From Knot Tight's diary (on post #81 of his build thread)

"...I ran a little shakedown trip on Wednesday. We left super heavy with the boat loaded with fuel, 800lbs of ice and 5 guys with all
their stuff for a day. The boat planes off easily and the load wasn’t noticeable in performance other than fuel burn. Mother Nature
showed us all her personalities from dead slick in the morning to fishing in 3-5 with 15 knots of wind most of the day to back to dead slick and then had 20 knots with gusts to 35knots coming home through storms.

The boat handled it awesome but we didn’t get the yellowfins we were after but did find some mahi and a few skippies. We chased bird packs so we were up and down off plane a lot. Covered 425 miles for the day with 354 gallons burned for the day. We didn’t see another boat all day if that says anything about the conditions we fished in. The boat ran 58.5 mph on the rev limiter on the way home with a little tide behind us. She definitely needs more prop but I am going to run a few more trips before we swap them out. I had an engine that was 200rpms low but it seems to have straightened itself out after putting some hours on it..."


Imagine what his diary would say if he was running those V10's !!! LOL





Old 06-11-2021, 03:50 PM
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Originally Posted by MarkV View Post
AT - from your mouth to God's ear...When those engines come out, I will contact your sons (because I know you don't give a shit about speed) and make them a deal on lightly used and well cared for Mercury 300R's that they can't refuse. I don't doubt they'll still be under warranty...As a preview, show them this picture, add about 3/4 mph, and bump up the fuel efficiency...

#timingiseverything #istillhave300morerpmtogo




From Knot Tight's diary (on post #81 of his build thread)

"...I ran a little shakedown trip on Wednesday. We left super heavy with the boat loaded with fuel, 800lbs of ice and 5 guys with all
their stuff for a day. The boat planes off easily and the load wasn’t noticeable in performance other than fuel burn. Mother Nature
showed us all her personalities from dead slick in the morning to fishing in 3-5 with 15 knots of wind most of the day to back to dead slick and then had 20 knots with gusts to 35knots coming home through storms.

The boat handled it awesome but we didn’t get the yellowfins we were after but did find some mahi and a few skippies. We chased bird packs so we were up and down off plane a lot. Covered 425 miles for the day with 354 gallons burned for the day. We didn’t see another boat all day if that says anything about the conditions we fished in. The boat ran 58.5 mph on the rev limiter on the way home with a little tide behind us. She definitely needs more prop but I am going to run a few more trips before we swap them out. I had an engine that was 200rpms low but it seems to have straightened itself out after putting some hours on it..."


Imagine what his diary would say if he was running those V10's !!! LOL
Haha....deal. I know the Conch would be a different boat with those 300Rs.
Old 06-11-2021, 04:10 PM
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Originally Posted by 196YWHB View Post
Congrats Mark, she’s looking great so far.

I walked a 37 Inv the other day and they had a unique “vent” built into their 3 piece poly enclosure. An easy way to get some breeze with little effort. I’ll probably ask Heath to try and incorporate something similar into my 3 piece once my number is ready.

I can send you a picture if you’d like. Drop me a PM with your cell number and I’ll text it to you.
Possible you can post that pic on here? Thanks!
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Old 06-11-2021, 04:13 PM
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Originally Posted by MarkV View Post
AT - from your mouth to God's ear...When those engines come out, I will contact your sons (because I know you don't give a shit about speed) and make them a deal on lightly used and well cared for Mercury 300R's that they can't refuse. I don't doubt they'll still be under warranty...As a preview, show them this picture, add about 3/4 mph, and bump up the fuel efficiency...

#timingiseverything #istillhave300morerpmtogo


From Knot Tight's diary (on post #81 of his

Imagine what his diary would say if he was running those V10's !!! LOL
It would likely say I ran out of gas 80 miles offshore. I have been using the boat weekly but it’s been very windy so I have only fished it twice. Hoping the weather gives us a break next week for our Bahamas crossing. I am definitely underpropped and he has the next pitch up on order but like everything right now it’s on backorder. Props should help a lot with cruise speed and economy.
Old 06-12-2021, 05:23 AM
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Originally Posted by Knot Tight View Post
It would likely say I ran out of gas 80 miles offshore. I have been using the boat weekly but it’s been very windy so I have only fished it twice. Hoping the weather gives us a break next week for our Bahamas crossing. I am definitely underpropped and he has the next pitch up on order but like everything right now it’s on backorder. Props should help a lot with cruise speed and economy.
hahhah! - Don't be a party pooper! But as Already There says and your post outlines, a design will get you to a certain point, the best components (engines) get fine tuned, and after that, sea conditions and how much weight the motors have to push determines speed and efficiency...For us we'll take anything over 1mpg. You averaged 1.20 over those 400+ miles w/5 guys and all the fixins...

As June comes to an end, the winds will start to lay down...wish we were going over there. We haven't been there since Dorian...



Old 06-12-2021, 05:32 AM
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Originally Posted by MarkV View Post
hahhah! - Don't be a party pooper! But as Already There says and your post outlines, a design will get you to a certain point, the best components (engines) get fine tuned, and after that, sea conditions and how much weight the motors have to push determines speed and efficiency...For us we'll take anything over 1mpg. You averaged 1.20 over those 400+ miles w/5 guys and all the fixins...
Easily averaged that and spent 6 hours in conditions that were very challenging. Next long trip I will load the boat differently which should help the economy also.
Old 06-12-2021, 06:57 AM
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I’ve said this to several people, and I truly feel this way. The only limitation I’ve found for this hull, is the amount of horsepower that I chose to put on it. I have twin 400s and wish I would have bought the 450s, because the hull wants more.
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Old 06-12-2021, 09:48 AM
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Shane, you're not that far out performance wise. And when you consider that the extra 100 ponies were going to cost 40 large more... Anyway...

In February, while MCI was hatching the hull in Sarasota, Hinkley and company were infusing the liner in Homestead.During Carpediem2015's build period, Hinkley was in the process of bringing up the lamination (south) shed and with startup and everything else going on, having to deal with the cluster---k of new construction. That process has reached the 95-97%(?) mark, and their crane system is also now in place. Here are a couple of short video clips from the builder as well as a few pics of that area of the yard when the hull first showed up in mid March...



The hull arriving at the H3 yard in Mid march. I think this design 'hides' its size well until you look inside. It might be that unlike some other cats, the side profile doesn't look very 'slabby'



In the new shed showing an untouched rear quarter


Standing with Miguel in the lamination shed looking at their overhead rail system. During the month of March & April many of the 'puzzle pieces' were cast and finished both here and in the north shed












Last edited by thtmgt; 06-16-2021 at 09:27 AM.
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Old 06-12-2021, 10:05 AM
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Curious - With nothing to stop the "Cat sneeze" is it bad or not so?
Old 06-12-2021, 04:22 PM
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Originally Posted by AverageJoe View Post
Curious - With nothing to stop the "Cat sneeze" is it bad or not so?
Joe, for the few hours I have spent on the boat there was none. But I would say I'm not qualified to comment. I am curious myself and would defer to Tim (Carpediem2015), Shane (rcoshane), and/or Corey (Knot Tight). These guys have substantial time on the boat and would know ...

I would also like to hear what they have to say regarding tunnel slap. There was commentary on previous threads that the tunnel shape would induce tunnel slap. In my seatrials of the other builders - Freeman, Invincible, Prowler, & Seahunter, they all tunnel slapped in the chop generated during the boat show melee. In the bigger boats (40 Inv, 41 SH, 42 Prowler & Freeman) conditions were too flat to really feel it.The only one I could not recall tunnel slap on was Jaguar. That boat was a rocket and i was concentrating on holding on...

Regarding boat size. A 40' cat is too big for us. The 40' cats were huge...
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Old 06-13-2021, 05:49 AM
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All cats are going to “sneeze” if there is enough wind and rough seas. Just like asking someone if a certain mono boat is “wet” or not. My sea trial with Heath was pretty light seas, we were running the full range of speeds for about 90 minutes, and I didn’t get one mist of a sneeze. If it was blowing 20-25, in true 5-6 ft seas, we probably would’ve gotten wet.

From what I’ve been told, the much older cat designs sneezed more than the newer cat design.

Good to hear others perspectives on the sneeze too.

Old 06-13-2021, 06:03 AM
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There’s some sneeze, in the right conditions. I haven’t found it to be a problem. I haven’t noticed hull slap. If there is any, it’s minimal. I’ll also fish on days that most stay home, so most may never see the sneeze.
Old 06-13-2021, 03:50 PM
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I have definitely seen a little sneeze on mine but both days I have fished mine it was much less than ideal conditions and the sneeze was very light. It has had to be very rough to do it when you are running and big swells when trolling to close off the tunnel. I haven’t had the hull slap while running, it did slap while trolling a little bit it was very rough. It was so rough I would have felt crippled the next day in my prior 35 ft boat and we covered 425 miles in a day. About half of that spent in 3-5 or better.

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