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Trailer tongue weight

walt

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Jun 1, 2007
3,410
Macgregor 26S Hobie TI South Park, Colorado
If you move the boat forward on the trailer, the tongue weight will increase not decrease. .. However your 27 pounds is about the same increase I got over the current 70 pounds the OP said (actually said 60 to 80).

What I did.. First estimate the current distance of the boat mass in front of the pivot (trailer tires)
70 pounds * 12 ft = 2000 pounds *D
D = 0.42 ft. Ie, the boat mass (neglecting a few things) is centered.42 ft in front of the axle

If the boat center of mass is moved forward by 2 inches, the new D is .586 ft in front of the axle.
Tongue wieght * 12 ft = 2000 pnds * .586 ft
New Tonque wieght = 97.6 pnds

At least I think LOL.. And Im not sure why the OP said he could move the boat forward by 2 inches. I know with the Macs (which you and I have), they often get loaded with the boat sitting back a couple inches or more from the front stop and it can make the boat tow unstable.
 
Last edited:

srimes

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Jun 9, 2020
112
Macgregor 26D Brookings
OHHH you said FROM 70 to 100 I read it as BY 70 to 100. My bad lol sorry! Looks like I disagreed by agreeing.
 
Sep 22, 2018
1,415
Hunter 216 Kingston
I know I should be between 10% - 15% total trailer weight (including boat and all it’s accessories) but am finding mine is way light... like I should be 220 - 330 lbs and I’m only 60 -80 lbs.

Not wanting to pull the motor off every time we trailer... looks like the boat can move about 2” forward on the trailer with some effort, this should help but will still probably be light. I see weight distribution hitches but they seem more aimed at heavy tongue weight so I don’t know if it would help?

Any ideas other than moving heavy objects every time we tow? There’s not a lot I can think to move forward during transport as I keep the boat pretty empty except for sails and a small toolbox
You asked for ideas so....

I assume you are towing your Hunter 18.5 so on a trailer it looks like this.

CD9C623A-AF5C-4BA7-A136-470907B06FF2.jpeg


I can only assume the wing keel sits on some kind of tray but is it possible to move the brace that holds the winch and bow stop forward a bit and keep the keel on the tray?

At 1600lbs the boat is not a monster but having the trailer balanced correctly can make quite a difference.

Good move in getting the correct height on the tow ball.

Carrying your spare tire near the hitch will add some tongue weight.

Reluctance to move motor if that’s the only option could prove costly, just sayin :)
 
Jul 23, 2019
81
Hunter 18.5 Revelstoke
You asked for ideas so....

I assume you are towing your Hunter 18.5 so on a trailer it looks like this.

View attachment 182703

I can only assume the wing keel sits on some kind of tray but is it possible to move the brace that holds the winch and bow stop forward a bit and keep the keel on the tray?

At 1600lbs the boat is not a monster but having the trailer balanced correctly can make quite a difference.

Good move in getting the correct height on the tow ball.

Carrying your spare tire near the hitch will add some tongue weight.

Reluctance to move motor if that’s the only option could prove costly, just sayin :)
Yes our boat / trailer combo are close to identical... modifying the keel stop isn’t really an option because that would mean V at the front would have to move back ......but it’s out of room because of the tongue extension.
 
Last edited:
Nov 6, 2019
9
Marshall 15 Catboat Lafayette, LA
one gallon of water (at room temp 76*) weighs - - - - - > 8.33 lbs.

one cubic foot of water contains - - - - > 7.48 gallons
 
Last edited:
  • Wow
Likes: Meriachee
Aug 1, 2011
3,835
Catalina 270 255 Wabamun. Welcome to the marina
one gallon of water (at room temp 76*) weighs - - - - - > 8.33 lbs.

one cubic foot (12" x 12" x 12") of water contains - - - - > 7.48 gallons
8.33 or 2500, is no nevermind. That wasnt exactly the point of the post. It was all about the deadweight and effort.
Move the boat - hard
Move the axle - very hard
Move the motor - pretty simple
 
  • Like
Likes: RussC

GTD

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Jul 31, 2020
1
Oday 17 Daysailer Rye, NH
The simplest "fix" is to add stationary deadweight to your trailer - forward of the axle.
The point of attachment will determine how much weight you need to reach your 10% tongue load.
 
Jun 2, 2004
2,960
Hunter 23.5 Fort Walton Yacht Club, Florida
Moving the axle is the solution.

Moving the axle is actually not hard, involved a bit perhaps but not hard. If the brackets are welded on it takes about a half and hour to grind the welds off and then it is a simple procedure to bolt on new brackets for the springs and fenders. Don't shy away from what is actually the solution for what is a partial remedy.