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Old Mar 09, 2013, 11:43 AM
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Return of the Warlord
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c & g of a genesis cat

does any body know what c&g of a genesis cat is.

Thank you
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Old Mar 09, 2013, 11:45 AM
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I would bet on a typing mistake from cog (center of gravity)...
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Old Mar 09, 2013, 12:21 PM
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Oops

lol, meant COG
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Old Mar 09, 2013, 03:38 PM
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Terminology aside it will depend on the boat's weight, prop and speed. Start with the CG 32% forward measured from the sponson transoms - not from the extreme rear of the boat.


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Old Mar 11, 2013, 09:26 PM
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That works out to be 13-1/4" from the very back of the boat (transom).
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Old Mar 12, 2013, 08:59 PM
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Okay I guess a terminology lesson is in order, but maybe not. "The very back of the boat" is not the transom. The Genesis hull has an overhang for the rudder mount - the sponson transoms are at least four inches ahead of the "very back of the boat". See the photo below.






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Old Mar 17, 2013, 09:08 PM
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so how would you set your batteries do you center them on the 13 1/4 line or do you set them in front of your line or behind your cog line?
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Old Mar 18, 2013, 01:30 AM
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I have a Genesis & never bothered working this out.

I went to the lake ran the boat then brought it in & adjusted the battery position to suit.

Here is the result..........
First run of Genesis after rebuild (0 min 0 sec)
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Old Mar 28, 2013, 10:06 PM
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Quote:
Originally Posted by almaidah View Post
so how would you set your batteries do you center them on the 13 1/4 line or do you set them in front of your line or behind your cog line?
Mark the hull (both sides of hatch opening) at 13-1/4" from back. Put batteries in, lift hull at the marks, see which way you need to relocate batteries to get it to balance level. This is a good starting point, you'll be close.
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Old Sep 30, 2014, 05:23 PM
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Go fast, pull up.
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So 13.25" from back of boat or start of sponsons?
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Old Sep 30, 2014, 08:42 PM
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The very back of the boat (transom).
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Last edited by sundogz; Sep 30, 2014 at 08:44 PM. Reason: keep it simple.
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Old Oct 04, 2014, 10:07 AM
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I believe Bill runs his cats at about 38% cog from transom. Seems to keep them planted and not so flighty.
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Old Oct 04, 2014, 12:09 PM
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Go fast, pull up.
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Mine is hopping along in the water at full throttle and I cannot make it stop. It runs great at half throttle

Genesis (0 min 15 sec)
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Old Oct 04, 2014, 03:42 PM
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Looks like you either need to move the center of gravity forward some and/or adjust the strut. The bottom of the strut should be parallel and level to the bottom of the sponsons (lay it on a table to see this).
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Old Oct 04, 2014, 04:02 PM
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Go fast, pull up.
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Thank you Sundog. That is where I started with the strut and I have since tried raising it another one eighth of an inch. I have moved the batteries all the way forward and then all of the way back and it doesn't seem to make any difference regarding the hopping in the water… Maybe the batteries do not weigh enough to make a difference
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