Go Back  The Hull Truth - Boating and Fishing Forum > BOATING FORUMS > The Boating Forum
Reload this Page >

Compmillennia Cat Build Thread 40' Lightspeed® "Elle à quatre"

Notices
Like Tree1242Likes

Compmillennia Cat Build Thread 40' Lightspeed® "Elle à quatre"

Old 05-19-2019, 08:04 PM
  #1241  
Senior Member
 
Join Date: Dec 2010
Posts: 252
Default

This thread is all but fizzled out. Where did the boat go? Wish the new owner kept it going.
Killula is offline  
Old 05-23-2019, 04:34 AM
  #1242  
Admirals Club Admiral's Club Member
 
Join Date: Oct 2017
Location: Boca Raton
Posts: 41
Default

look in the hopper for the next Comp coming down the stretch with twin Merc 300's and a tower. Get Jim to post some pictures.
Winter40 is online now  
Old 05-25-2019, 08:09 AM
  #1243  
Admirals ClubCaptains Club Member Admiral's Club Member
THT sponsor
Thread Starter
 
Join Date: Jul 2005
Location: Miami Fl / Washington NC
Posts: 2,036
Default

The "Quatre" owner had a racing multi-hull (sail) back ground as I have so our common mantra was to achieve the goals with simplicity and light weight. They allows the transition between boat and ground effect vehicle to happen at lower speeds. We debated jack plates throughout the build and the Mantra guided the boat leaving the shed without them. Knowing the effort we make to save a lb., slapping 350 lbs on the transom with the stroke of a P.O. is a little grievous but necessary. We will be using the jack plates to lower the engines the faster we go.
Otseg is offline  
Old 05-25-2019, 09:06 AM
  #1244  
Senior Member
 
Join Date: Nov 2011
Location: North Shore , Lake Pontchartrain
Posts: 145
Default

Seriously a "hypercar" of performance fishing boats. The design, engineering, and performance is impressive to see. Nice to not just be shown pictures of something but have the person behind it explain the thought behind it. Thanks for taking the time to document the build.
jtheriot is offline  
Old 05-25-2019, 09:08 AM
  #1245  
Senior Member
 
Join Date: Mar 2010
Posts: 654
Default

FINAL MPH
AT THIS POINT
piazzafatb is offline  
Old 05-25-2019, 06:28 PM
  #1246  
Admirals ClubCaptains Club Member Admiral's Club Member
THT sponsor
Thread Starter
 
Join Date: Jul 2005
Location: Miami Fl / Washington NC
Posts: 2,036
Default

Originally Posted by piazzafatb View Post
FINAL MPH
AT THIS POINT
92.9 is the final Slowest MPH at this point.
Once we have all the mods in place for trim and load the boat properly, we will get some new numbers with the recommended octane fuel while running the current "off the shelf" Bravo 1's. I also expect more after that with true surfacing props contemplated.
Jassman, chiung, Flatout71 and 2 others like this.
Otseg is offline  
Old 05-25-2019, 09:59 PM
  #1247  
Admirals Club Admiral's Club Member
 
Join Date: Feb 2012
Location: Southern Most State in the US
Posts: 1,126
Default

What a wicked catamaran. Love the color and quads. And 90+. Dang.
wish we could see some interior pics. Are they classified and hence you’d have to kill everyone after they saw the interior of the boat you built?
noanoa is offline  
Old 05-26-2019, 06:22 AM
  #1248  
Senior MemberCaptains Club Member
 
Join Date: Jun 2006
Location: Diamondhead, MS
Posts: 3,950
Default

Originally Posted by Otseg View Post
92.9 is the final Slowest MPH at this point.
Once we have all the mods in place for trim and load the boat properly, we will get some new numbers with the recommended octane fuel while running the current "off the shelf" Bravo 1's. I also expect more after that with true surfacing props contemplated.
Looking forward to the mod and a 200 rpm increase can be good for about 10mph gain in speed. Possibly A different lower unit...will this work https://www.mercuryracing.com/sternd...-master-drive/
Jassman is offline  
Old 05-26-2019, 07:15 AM
  #1249  
Admirals Club Admiral's Club Member
 
Join Date: Oct 2007
Location: WPB, Fl.
Posts: 10,310
Default

Originally Posted by Otseg View Post
The "Quatre" owner had a racing multi-hull (sail) back ground as I have so our common mantra was to achieve the goals with simplicity and light weight. They allows the transition between boat and ground effect vehicle to happen at lower speeds. We debated jack plates throughout the build and the Mantra guided the boat leaving the shed without them. Knowing the effort we make to save a lb., slapping 350 lbs on the transom with the stroke of a P.O. is a little grievous but necessary. We will be using the jack plates to lower the engines the faster we go.
How much more hull will be out of the water at 100?
Will grasshopper`s cheeks explode?
About 4 years ago at the show here, Nortech had Bravo 28`s cut like choppers. They and 7 marine were finally happy.
gofastsandman is offline  
Old 05-26-2019, 09:18 AM
  #1250  
Senior MemberCaptains Club MemberPLEDGER
 
Join Date: Sep 2003
Location: CA & San Carlos, Mx
Posts: 20,736
Default

Originally Posted by Otseg View Post
The "Quatre" owner had a racing multi-hull (sail) back ground as I have so our common mantra was to achieve the goals with simplicity and light weight. They allows the transition between boat and ground effect vehicle to happen at lower speeds. We debated jack plates throughout the build and the Mantra guided the boat leaving the shed without them. Knowing the effort we make to save a lb., slapping 350 lbs on the transom with the stroke of a P.O. is a little grievous but necessary. We will be using the jack plates to lower the engines the faster we go.
My mother always told me not to get high too.
Cant the motors just be lowered slightly notching the transom where they hang over it and lowering the cable wells slightly without the brackets to save the 350 lbs?
Bullshipper is offline  
Old 05-26-2019, 09:28 AM
  #1251  
Senior Member
 
Join Date: Dec 2016
Posts: 144
Default

Originally Posted by Otseg View Post
92.9 is the final Slowest MPH at this point.
Once we have all the mods in place for trim and load the boat properly, we will get some new numbers with the recommended octane fuel while running the current "off the shelf" Bravo 1's. I also expect more after that with true surfacing props contemplated.
so close think it deserves a trip to lake x to get the last little bit out of her I am sure mercury wants see it break 100 as much as everyone else does
tad117 is offline  
Old 05-26-2019, 10:08 AM
  #1252  
Admirals ClubCaptains Club Member Admiral's Club Member
THT sponsor
Thread Starter
 
Join Date: Jul 2005
Location: Miami Fl / Washington NC
Posts: 2,036
Default

Originally Posted by gofastsandman View Post
How much more hull will be out of the water at 100?
About 4 years ago at the show here, Nortech had Bravo 28`s cut like choppers. They and 7 marine were finally happy.
Not much touching.

Good point about the props. The max 5's and the Bravo 1's have rounded blade tips. If we had stayed with the max 5's cutting the tips would have allowed us to keep the pitch and raise the RPM. As it was, we had way to much blade area for the weight. 0 to 60 in 6 some seconds was evidence of that. My favorite boat as a kid was the Switzer Wing. You may notice there is not a 66" wide center console with full windshield, T Top with radar in this photo.

I had reached out to Berky remembering a flow model he had posted in his catamaran build thread. Before he could reply, our business neighbor walked in with his laptop. He had roughly modeled my Mini Van with the various T top configurations. Gotta use that Doctorate in Fluid Dynamics for something! :-) Its a lot of work. 20 hours to generate the wire frame and run some tests. Evidently some models he did in school took days to run.

All things to consider are pretty interesting. Most are pretty obvious but to see the Lift, drag and yes downforce numerically displayed confirming what my Mini Van told me was really cool.

Barnacled and SLT Kota like this.

Last edited by Otseg; 05-26-2019 at 10:13 AM.
Otseg is offline  
Old 05-26-2019, 10:32 AM
  #1253  
Senior Member
 
Barnacled's Avatar
 
Join Date: Jun 2010
Location: Lower, AL
Posts: 5,185
Default

Every run is a dry one.
Barnacled is offline  
Old 05-26-2019, 07:38 PM
  #1254  
Admirals ClubCaptains Club Member Admiral's Club Member
THT sponsor
Thread Starter
 
Join Date: Jul 2005
Location: Miami Fl / Washington NC
Posts: 2,036
Default

Fairly well dry.


Otseg is offline  
Old 05-26-2019, 09:11 PM
  #1255  
Admirals Club Admiral's Club Member
 
Join Date: Jan 2017
Posts: 479
Default

Just a thought here but the do a run up at lake of the ozarks in mo called the shootout. The fastest boats in the world show up to see who can lay down the fastest mph in a 3/4 mi. Cant exceed 40mph at the start line. It would get some very good attention as there are boaters from everywhere there that weekend. There are also a couple of events to show off the boat.
. I promise you wont be the fastest cat there but you will be the ONLY fishing cat there. Google it you will have a fantastic time.
Jassman, pas and avalonandl like this.
Castawaychris is offline  
Old 05-27-2019, 04:07 PM
  #1256  
Admirals Club Admiral's Club Member
 
Join Date: Oct 2007
Location: WPB, Fl.
Posts: 10,310
Default

Originally Posted by Otseg View Post
Not much touching.

Good point about the props. The max 5's and the Bravo 1's have rounded blade tips. If we had stayed with the max 5's cutting the tips would have allowed us to keep the pitch and raise the RPM. As it was, we had way to much blade area for the weight. 0 to 60 in 6 some seconds was evidence of that. My favorite boat as a kid was the Switzer Wing. You may notice there is not a 66" wide center console with full windshield, T Top with radar in this photo.

I had reached out to Berky remembering a flow model he had posted in his catamaran build thread. Before he could reply, our business neighbor walked in with his laptop. He had roughly modeled my Mini Van with the various T top configurations. Gotta use that Doctorate in Fluid Dynamics for something! :-) Its a lot of work. 20 hours to generate the wire frame and run some tests. Evidently some models he did in school took days to run.

All things to consider are pretty interesting. Most are pretty obvious but to see the Lift, drag and yes downforce numerically displayed confirming what my Mini Van told me was really cool.

Haha!

Great vintage photo there.

Growing up on the Cape in the seventies, the Nantucket ferry Menemsha was a hydrofoil. We were supposed to have jet packs, flying cars, and hydrofoils.

We got mini vans.
Big, flat, wide, bricks powered by 2.2 litres of anemia.

Last edited by gofastsandman; 05-27-2019 at 04:24 PM. Reason: love the modeling
gofastsandman is offline  
Old 05-28-2019, 07:11 PM
  #1257  
Admirals Club Admiral's Club Member
 
Join Date: Feb 2012
Location: South Creek Village
Posts: 4,975
Default

Originally Posted by Castawaychris View Post
Just a thought here but the do a run up at lake of the ozarks in mo called the shootout. The fastest boats in the world show up to see who can lay down the fastest mph in a 3/4 mi. Cant exceed 40mph at the start line. It would get some very good attention as there are boaters from everywhere there that weekend. There are also a couple of events to show off the boat.
. I promise you wont be the fastest cat there but you will be the ONLY fishing cat there. Google it you will have a fantastic time.
Nah, it'll be slower without the buoyancy of salinity.
TurnMeLooseFLKeys is offline  
Old 05-29-2019, 03:07 AM
  #1258  
Admirals ClubCaptains Club Member Admiral's Club Member
THT sponsor
Thread Starter
 
Join Date: Jul 2005
Location: Miami Fl / Washington NC
Posts: 2,036
Default

Originally Posted by TurnMeLooseFLKeys View Post
Nah, it'll be slower without the buoyancy of salinity.
Two more down sides. The lakes are 659' above sea level and the shootout is in August. You don't see Girls in Bikini's and cold Dense air together much.
The twin turbine 50' Cat at the Shootout that ran 244 MPH didn't seem to mind though.

Otseg is offline  
Old 05-29-2019, 04:44 AM
  #1259  
Admirals Club Admiral's Club Member
 
Join Date: Jan 2013
Posts: 4,585
Default

That Speed Run will probably never be topped. And it really shouldn't, as that Mystic Cat w/ twin Lycoming 5000 hp turbines was on the edge the whole way of becoming a bad airplane. The aerodynamics are so close to a blowover.

And the propellor tip speeds are very dangerous, when they let go its a large grenade. I believe they run Herring props.

Looking forward to seeing speeds on the Quatre Cat.
avalonandl is offline  
Old 05-29-2019, 06:36 AM
  #1260  
Admirals ClubCaptains Club Member Admiral's Club Member
THT sponsor
Thread Starter
 
Join Date: Jul 2005
Location: Miami Fl / Washington NC
Posts: 2,036
Default

In this video you can hear Miss Bud's prop and shaft failing at over 220 mph. The prop was later sold on EBAY after someone found it 600' away stuck in a levee. :-)

Otseg is offline  

Thread Tools
Search this Thread