Redo of a 20' 1985 CC

[Capt Terry]

Originally Posted by Parker Yacht

I don't think so.
It had an in deck livewell before just about a foot forward of this, plus we moved the batteries from the aft corners up to the console.

Ole- You are probably right about the battery shift compensation with your experience. However, you may be interested in my post now or in the future from 11/18/16 on Estimating CG Shift with Heavy Engines where I put some science to try to help the folks contemplating four strokes, brackets, moving consoles, etc. on longitudinal shift of cg. Performance moderator Bushwacker who has been quite candid about the pros & cons of brackets appreciated my post

[Parker Yacht]

Originally Posted by Capt Terry

Ole- You are probably right about the battery shift compensation with your experience. However, you may be interested in my post now or in the future from 11/18/16 on Estimating CG Shift with Heavy Engines where I put some science to try to help the folks contemplating four strokes, brackets, moving consoles, etc. on longitudinal shift of cg. Performance moderator Bushwacker who has been quite candid about the pros & cons of brackets appreciated my post

Do you have a link to that thread? I would like to read it.

[Capt Terry]

Originally Posted by Parker Yacht

Do you have a link to that thread? I would like to read it.

Don't know how to link to it. At least not using my phone anyway. Sorry but the correct date of the original post is 9/24/16. There is a link in it to a pdf that shows an example of the math. There were several subsequent reponses to this. So please either coach me on how to put in a link or search under Capt Terry and that date.

[FLexpat]

http://www.classicseacraft.com/commu...ad.php?t=28289

[Parker Yacht]

Thank you.
Very nice!
That did evolve math, which I am not good at.
There are definitely pros and cons on brackets.

[Old'sCool]

Is there a reference where the designed CG should be per Seacraft model? Or rough estimate? Or should we compute that based on original configuration??

[Capt Terry]

Originally Posted by Old'sCool

Is there a reference where the designed CG should be per Seacraft model? Or rough estimate? Or should we compute that based on original configuration??

Bushwacker has noted that with Moesley's experience as a military then private commercial pilot he would have been familiar with handling changes as fuel is consumed. Therefore Carl may have located the middle of the fuel tank near the cg to minimize changes as the fuel level drops. Sounds reasonable. As explained the estimator is more for cg shift as modifications are made. When I created it I think I both scaled the middle of the tank from a brochure as well as measured it on the boat.

[FLexpat]

Originally Posted by Capt Terry

Bushwacker has noted that with Moesley's experience as a military then private commercial pilot he would have been familiar with handling changes as fuel is consumed. Therefore Carl may have located the middle of the fuel tank near the cg to minimize changes as the fuel level drops. Sounds reasonable. As explained the estimator is more for cg shift as modifications are made. When I created it I think I both scaled the middle of the tank from a brochure as well as measured it on the boat.

Being an ex PW engineer also, I over-geeked this myself. I modeled my entire 23 Sceptre in 3D CAD and checked the computed CG against fuel tank location - the calculated CG is within 1" of the center of the tank so that is consistent with the legends and folklore. I was stunned but it really makes it a lot easier to understand the effects of changes I make.

[Capt Terry]

Hey Flexpat. Thanks for the confirmation. You are obviously better at CAD than I ever was. Send me a PM and tell me about youself and where our paths may have crossed. I was at PW in WPB from 1969-2000. I ordered my 20' Seafari in 1976 from Brown & Hauptner after a FAST demo ride out the Palm Beach inlet with Bushwacker.

[gofastsandman]

Originally Posted by Capt Terry

Hey Flexpat. Thanks for the confirmation. You are obviously better at CAD than I ever was. Send me a PM and tell me about youself and where our paths may have crossed. I was at PW in WPB from 1969-2000. I ordered my 20' Seafari in 1976 from Brown & Hauptner after a FAST demo ride out the Palm Beach inlet with Bushwacker.

He does like to play.
I love that about him.