Center of gravity (longitudinal) for 2013 310 hardtop express cruiser
solarmeter
Member Posts: 5 ✭
We are having a boat hoist (lift) built soon on Lake St Clair. Due to water depth typically 3 feet at dock... we need to use sling straps rather than typical thick beams and cradle - since draw is about 2 feet with drives trimmed mostly up.
Our marine contractor needs to know the center of gravity so slings can be equalized fore and aft of the CG.
Calls/emails to Rinker no help so far. Please tell me if you know... either dry or wet CG distance forward of transom.
Or... if you know a direct phone # for someone in engineering at Rinker I can call? Even owner (Randy?) # if need be.
Steve M
Best Answer
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NavyCTRC
Member Posts: 303 ✭✭✭
The installer should be able to get pretty close just by a couple trial and error lifts. Since it would be ill advised to leave it slung for any major wind storm, "pretty close" should be good enough. Normally, two or three feet from the transom and then 10-12 feet forward of the transom, or a couple feet forward of the helm. This is what I see a good deal of the time around here.
Answers
@solarmeter, this is just my first look at my CDs of our former 2013 Rinker EC 310. These pictures were taken the day it arrived from the Rinker factory and was loaded off the Rinker factory transport. I remember that the rear sling was about 3-4 feet in from the end of the transom to support the weight of the engines, drives, generator, waste and water holding tanks etc. I "think" the front strap was about 10 feet in from the bow just past where the main lifting strake terminates. I think I may have more pictures of it in slings. I have about 20 Cds to go through - I'll keep looking.
You can use your cursor to click on various areas of the picture for a closer look at the nearest areas to where the straps were located.
@solarmeter this is where they placed the support stands before they removed the slings. I'm 99.9% sure the slings were about 2.5 feet (30") in front of each stand (towards the bow of the boat). I'll keep looking
Does anybody have a 310 Rinker in a "backyard" lake boat hoist that uses slings?? I suppose not. But if so.... please post any info/pics you may have regarding the sling locations fore and aft.
Even if you have a 28 - 34 foot boat on slings the info would be helpful in estimating center of gravity.
@Tex68. That was a factory shrink wrapped cover fro transport from the Rinker factory to the receiving dealer.
Rinker did it right when installing it with breathing holes to prevent humidity build-up and rusting of engine/genny and other mechanical parts.
I don't know what it costs to shrink wrap your boat yourself. I do know that I paid $1,000.00 to have my EC 360 shrink wrapped for transport to the USA when I sold it. However, that included labor.
I do know shrink wrapping is a bit of an art and one mistake with the torch will have bad results for gel coat or hard tops.
I would think there would be a point where shrink wrapping it yourself each year and having a cover made (lots of info on that on this forum) would break even.
I just got off the phone with a friend who has made all sorts of custom screens and makes covers for my various Rinkers. I asked her your question.
She said a whole boat cover like you see in the pics of my boat could certainly be made. She said with that size you would need to make sure you braced for any snow loads -but- that type of cover is doable for sure.
She recommended breathing ports in areas that snow/water could not accumulate and some breathing flaps right where the air supply goes through the hull side to the engines.
As well, she always installs a couple of bags of Damp Rid in the downstairs cabin and an open pail of it in the engine compartment.
Hope this helped a bit. Good luck. MT
P.S. I actually saved a couple of the "factory" covers from Rinker waaay back when I bought new bow riders and added ventilation to them. I could get about 3 years out of one of them. But - for the cruisers they pretty much cut the "factory" covers up to get them off!
CHEERS
@Tex68. I'm pretty sure she would want your boat there as a template to do the work as she is very precise.
But, there are guys on this forum that are Rinker cover experts. You might want to send @Dream_Inn a personal message as I believe he may have had a full cover made for his Rinker 400 by Fisher Covers.
IMO there are also two other options. As you mentioned maybe just a cover that goes over the entire deck and over the cockpit but not the hard top. If you don't get much snow a good waxing of the hard top before storage might be okay if it's mostly rain.
Another option would be to just get the hard top shrink wrapped. That outta be cheap, then just put on a cover over the deck and cockpit? Trying to think of options :-)
A sea ray had a neat combo at a slip near me a couple of years ago. He had a cover that went over the whole deck and cockpit and added second one later that he could put over the hard top. I didn't see it on but he showed it to me, it was stored in a canvas bag in is transom. He said he put it on in the winter and it fastened to the main cover with Velcro. I asked about it blowing away and he said if there had been issues he would have added snaps but didn't want them unless required as he feared scratching of the gel coat.
My advice would be to see if anyone (like Fisher) has a pre made one, if not I'd check with one of the forum guys.
Good luck!
Dream 'Inn III -- 2008 400 Express
Dream 'Inn III -- 2008 400 Express