Re: M_Boats: Re:Battery Location M17 and trim
Fred, I didn't see any other replies on this, so I'll give it a shot. According to Jerry and the speed guys, the rule of thumb on both the M17 and the M15 is get the weight as far forward as possible. You want to have the transom out of the water as much as possible for good boat speed, as it causes drag. 3 inches seems like a lot, but you're carrying a lot of battery weight there. Are you using an electric motor? If you don't have an outboard hanging on the transom, that would explain the difference in trim. I wouldn't think you'd want to move the weight much further back than the mast support. Larry On Fri, 5 Aug 2005 07:38:05 -0700 Frederick M Berthrong <fthrong@juno.com> writes:
M-17 ers,
I have two, frame 24 batteries which I installed on a platform which is glassed in just forward of the mast support strattling the centerline and under the bunks. I haven't weighed them but that is about 100 lbs total. The problem is Dulce sits in the water heavy by the bow (about three inches lower in the bow) . I concluded that the two batteries are the reason. I temporarily, just to check it out, moved the batteries aft and on either side of the CB trunk. This helped the trim but did not correct it entirely. It is clear that the bow section displaces less water than the stern part so it is logical that heavy stuff be stowed aft. But even with the 100 lbs of battery further aft she sits with the stern about an inch or more higher than the bow as indicated by the factory located water line (boat fully rigged but with no humans on board).
Does anyone else have this issue?
Once I get a couple of folks in the cockpit everything evens out. Is that by design?
Fred Berthrong Dulce M17 #300
On Thu, 4 Aug 2005 17:06:05 -0700 "jerry" <jerry@jerrymontgomery.org> writes:
If I can comment- that's probably the best place for a battery.
Jerry jerrymontgomery.org
----- Original Message ----- From: "Brian Gilbert" <hammerguy@mindspring.com> To: <montgomery_boats@mailman.xmission.com> Sent: Thursday, August 04, 2005 3:01 PM Subject: M_Boats: Re:Battery Location M17
Hi Steve:
The original battery location on my M17 was under the port berth, but it was too small for the monster battery I just bought for Tiny Dancer.(1000AH- at least it's a monster to me) Since the battery weighs 55 lbs, I figure it's pretty good ballast, so I've built a high-sided box of epoxy and glass-covered plywood, and epoxied that along the centerline of
the boat
just forward of the mast support under the Vberth. The battery is a little harder to get to, but it should work a little better than the stock setup with regards to trim. It'll be harder to check the water in it's
new
location, but it's well secured and should stay in place.
Best BG
-- Brian Gilbert Marine Media Author, Fix It and Sail (423)876-9990 3404 Hartford Drive Chattanooga, TN 37415 www.sailingsmall.com
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Larry, I agree having the battery forward of the mast works perfect for me. I think 2 batteries would be overkill for my purpose since I don't do a lot night sails. I only use mine mostly for depth gauge and knot meter. I can go a long time between recharges. But hey, whatever floats your boat (better trimmed). I am a "get in and go" kinda of guy so I don't worry about going faster, just going is good for me. gil -----Original Message----- From: montgomery_boats-bounces+gilbert=mindgame.com@mailman.xmission.com [mailto:montgomery_boats-bounces+gilbert=mindgame.com@mailman.xmission.com] On Behalf Of Larry E Yake Sent: Friday, August 05, 2005 9:48 PM To: montgomery_boats@mailman.xmission.com Subject: Re: M_Boats: Re:Battery Location M17 and trim Fred, I didn't see any other replies on this, so I'll give it a shot. According to Jerry and the speed guys, the rule of thumb on both the M17 and the M15 is get the weight as far forward as possible. You want to have the transom out of the water as much as possible for good boat speed, as it causes drag. 3 inches seems like a lot, but you're carrying a lot of battery weight there. Are you using an electric motor? If you don't have an outboard hanging on the transom, that would explain the difference in trim. I wouldn't think you'd want to move the weight much further back than the mast support. Larry On Fri, 5 Aug 2005 07:38:05 -0700 Frederick M Berthrong <fthrong@juno.com> writes:
M-17 ers,
I have two, frame 24 batteries which I installed on a platform which is glassed in just forward of the mast support strattling the centerline and under the bunks. I haven't weighed them but that is about 100 lbs total. The problem is Dulce sits in the water heavy by the bow (about three inches lower in the bow) . I concluded that the two batteries are the reason. I temporarily, just to check it out, moved the batteries aft and on either side of the CB trunk. This helped the trim but did not correct it entirely. It is clear that the bow section displaces less water than the stern part so it is logical that heavy stuff be stowed aft. But even with the 100 lbs of battery further aft she sits with the stern about an inch or more higher than the bow as indicated by the factory located water line (boat fully rigged but with no humans on board).
Does anyone else have this issue?
Once I get a couple of folks in the cockpit everything evens out. Is that by design?
Fred Berthrong Dulce M17 #300
On Thu, 4 Aug 2005 17:06:05 -0700 "jerry" <jerry@jerrymontgomery.org> writes:
If I can comment- that's probably the best place for a battery.
Jerry jerrymontgomery.org
----- Original Message ----- From: "Brian Gilbert" <hammerguy@mindspring.com> To: <montgomery_boats@mailman.xmission.com> Sent: Thursday, August 04, 2005 3:01 PM Subject: M_Boats: Re:Battery Location M17
Hi Steve:
The original battery location on my M17 was under the port berth, but it was too small for the monster battery I just bought for Tiny Dancer.(1000AH- at least it's a monster to me) Since the battery weighs 55 lbs, I figure it's pretty good ballast, so I've built a high-sided box of epoxy and glass-covered plywood, and epoxied that along the centerline of
the boat
just forward of the mast support under the Vberth. The battery is a little harder to get to, but it should work a little better than the stock setup with regards to trim. It'll be harder to check the water in it's
new
location, but it's well secured and should stay in place.
Best BG
-- Brian Gilbert Marine Media Author, Fix It and Sail (423)876-9990 3404 Hartford Drive Chattanooga, TN 37415 www.sailingsmall.com
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participants (2)
-
Gilbert Landin -
Larry E Yake