Offshoreonly.com - CG - Apache 41 / Cig 42

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ApacheCarl

03-23-2004 12:11 PM

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 :)

FeverFan

03-23-2004 01:10 PM

Quote:

Originally posted by dawezel
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.

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

GregP

03-23-2004 01:39 PM

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

ApacheCarl

03-23-2004 01:44 PM

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

WickedWon

03-23-2004 03:58 PM

1 Attachment(s)

Quote:

Originally posted by jody165
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

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.

dlbCheckmate

03-23-2004 04:11 PM

WWOW, now that's AWESOME !!!

klmken

03-23-2004 05:05 PM

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

dawezel

03-23-2004 05:38 PM

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.

dawezel

03-23-2004 05:39 PM

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

Comanche3Six

03-23-2004 06:16 PM

Quote:

Originally posted by SS930
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 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.

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