CG - Apache 41 / Cig 42
 

I'm building a new dock and boat lift and, thinking ahead, trying to determine if I will have enough slip length in front of my lift to hold a 41 Apache or a 42 Cig. How the boat is positioned on the lift will determine if it works or not.

The question I have is does anyone know the approximate distance from the transom to the center of gravity on either of these boats, assuming a pleasure boat setup with a side-by-side engine configuration?

No clue

But I like your taste in boats!

Re: CG - Apache 41 / Cig 42
 

Dawezel,

From a manufacturer's point of view, the Apache 41, pleasure version, is approximately 16' from the propshaft nut forward. The center of gravity is typically measured from the tip of the outdrive shaft. You may contact me if you have any additional questions. Good luck.

Mark McManus
Apache Powerboats

WOW !
 

The CG on my 41' full staggered Saber is 8'- 6" with all four fuel tanks full !

Wicked Won,

How did you measure your CG? Do you have to use a sling at a boatyard or is there some "backyard" way of doing it that the average person can do in their driveway? I have a 38 that I want to measure.

Thx

WickedWon:

That's a huge difference from what Mark's estimate (16 ft on the Apache 41). With the Saber 41 being the same design as the 41 Apache, I would think the CG would be similar with a side-by-side and even farther forward on your boat with the staggered config? Do you have a different fuel tank configuration than the Apache?

-dawezel

I would think Mark would know if anyone, but 16' sounds really far forward. If you think about the design of these boats, all the weight is in the back... to have the CG 40% forward from the transom doesn't add up.:confused:

I have no fuel forward of the dash bulkhead. Mark has just made a mistake. Just think how long the forks would have to be at the local rack and store :eek: As a rule of thumb look at the location of the center axle on a Myco trailer, the CG will be about two feet forward for tongue weight. On my lift I use 14' bunks and keep the transom close to flush with the aft end of the bunks. My boat weighs about 2000lbs less than an Apache and the CG is farther aft by a foot or two.

It all depends on fuel tank config(and how much fuel in said tanks), cabin setup and lay-up. The difference between a 41 race apache and 41 pleasure apache were CG is concerned is huge. Saber's are cored boats and are super light, alot less weight up in the nose. Remember a couple hundred pounds more weight way up in the nose of a boat goes a long way conteracting the weight of engines and drives(the old fulcrum physics thingy). Everglades could BARELY lift our 41 Apache raceboat up with there forklift. It was so tippy on the forks they started launching it at a ramp.

Judging from the current drawing I got from the dock builder, if I pull a 42 in all the way until the bow is about to hit the dock, I'll have 7-8 feet of boat hanging off the back of the lift, not including the drives. I'm worried that if the CG isn't somewhere relatively near the center of the lift, it's going to strain the lift and the boat, and could be ugly if a hurricane comes through.

I know I have the rear fuel fill on my boat over the rear bunk of the lift. I'll go measure how far the rear fuel fill is from the back of the boat and get back to you :)

Can you set it up for backing in? That may work better.

You want the lift bunks to extend aft to the transom. On my full cabin 40' Formula I'd guess the cg is about 15' from the transom (pretty much under the driver seat) based on my crude estimation of where to put it on the lift so the tension in the fore/aft cables is the same.

By the way, you can make the lift bunks extend behind the lift cross beams as needed to get the bunks to run to the transom and keep the cg between the two cross beams.

-Greg

I have about 5' of boat hanging from the back bunk on my lift, not counting the drives. Hope this helps.

While it was in the straps of the travel lift I put one stand under the keel while the operator eased the boat down. I kept moving the stand until it was obvious that the straps were starting to unload evenly. The boat has a halfcabin with #6's on 12" boxes. The 300 gals of fuel is carried in four 75 gal. tanks, two under the cockpit and two saddle tanks in the engine compartment.

WWOW, now that's AWESOME !!!

300 gallons of fuel?!?!? Doesn't that get you like 100 miles :crazy:

Thanks for all your help guys.

FeverFan:

Backing it in is an interesting idea, but I don't think I could get the cradle down enough in low tide to clear the drives.

BTW, Wickedwon...That's a sweeeeet looking engine compartment.

I believe the key is when Mark say's they measure from the prop shaft nut forward. If the pleasure version has #3 or #6 speedmasters on it, then that propshaft nut is a few feet off of the transom. That may clear up some of the confusion about the CG seeming so far forward.

I was thinking that may be the case.

I Stand Corrected !
 

I agree, especially on my boat the drive and box total would add 5'-0" to my total :eek: The question was how far from the transom but as Mark responded from the shaft tip that would put me at 13'-6" closing the gap dramatically. I am still surprised that a side by side pleasure 41 with #3's and no boxes would be that far forward as I have seen many of them come out of the water on (16' ?) forks, all be it as Carl said very carefully and more than a little "tippy" ;)

Hey WW,
That's one sweet rig you have there!:cool:

One thing that still has me confused is the proper location for the bunks....I recently had to modify my lift as the bunks were for a non stepped hull...so per the suggestions of a few members I modified it so as to not have the weight of the boat sitting on the steps.....however...I have also been told that you want the entire boat sitting on the bunks, because leaving a portion of the boat hanging off will increase the chances of having the hull develop a "hook"......So now I have the Gladiator pulled flush with the rear of the bunks....and the cables are about the same in tension....front to rear...or at least close anyway......any thoughts on this????

It's really not as bad as one might think ( swallowing hard :rolleyes: ) with the six blades it cruises at 90mph at 4500 rpm, as an experiment we ran it 55 miles at that speed and then topped back up, it took just over 65 gals. for .8 mpg. Now if I just wasn't running that 50/50 mix of $ 6.00 gal Maximal this might be considered reasonable but...........:rolleyes:

Guys thanks for the compliments. :)

BTW the difference between 4500 and 5500 rpm is to say the least, substantial, it drops to .5mpg :eek:

As you can see the shaft tips are way back.....

and I thought WickedTwo was bad ass:eek: :drool:

Ron P,
You need to do a write-up on this boat!:cool:

WickedWon,

The rigging on that boat is unbelievable. I love to see more pictures of that boat. WOW!!!!! I thought your Concept was great.