Where should the COG be on a 30 inch cat?

[LOVE6S]

Where should the COG be and how do you get it, do you put everything in the boat loose and get it to balance at a percent of lenght, say 25 0r 30 percent from the rear?

[Blackjack-sven]

Depends on the water conditions you will usually encounter but aprox 30% is a good benchmark to start with. Adjust from there.

[LOVE6S]

Do you do a dry run with your parts and lipos, motor, before you perm mount everything to get the location of the motor etc, to make it balance at the 30% mark?

[srislash]

You should set it up so you can adjust you're batteries to compensate for conditions/speed.The faster it goes the more forward the weight will need to be.Just move them a bit at a time.

What are you working on?

[LOVE6S]

Just ordered one of those 30 inch sprintcat knockoffs on ebay, it was cheap and I liked the hull, I am going to do my first scratch build. could use some advise on motor placement and probally a few things along the way, figured I would do my first on on a cheaper hull and get some experience.

[Make-a-Wake]

10-11" from transom.

[srislash]

Just ordered one of those 30 inch sprintcat knockoffs on ebay, it was cheap and I liked the hull, I am going to do my first scratch build. could use some advise on motor placement and probally a few things along the way, figured I would do my first on on a cheaper hull and get some experience.

Have you picked a motor yet?Or motors?

[LOVE6S]

Really that seems kinda back, but thanks because that and getting the stuffing tube through, were the two things that I really where wondering about.

[LOVE6S]

Not really, I have a t600 1400 kv, I could use, or I was thinking a 4982 or 4092, theres plenty of room the way the hatch is shaped.

[Make-a-Wake]

Really that seems kinda back.

Dont know who you are referring to, but others have said 30%(9" from transom), my suggestion puts you between 33.3-36.6%..............cats like the cog up a bit farther.

[LOVE6S]

I meant 4082. How do you think a 4082 1800kv on 5s with a t180 esc would be?

[LOVE6S]

Ok 33% to 36% how far from the transome do I put the motor and mount do I put all the stuff in the hull and move it around till I get close to 33% COG ?

[srislash]

Ok 33% to 36% how far from the transome do I put the motor and mount do I put all the stuff in the hull and move it around till I get close to 33% COG ?

I would put the motor at about the CG point.10"-11",everything else is movable.You're ESC can go in front or behind the motor.Batteries in the sponsons on trays so you can strap them in.
Here is how my 29" MG is set up

[LOVE6S]

Ok thanks

[srislash]

Hope that helps.They are very similar sized hulls.