Fixing outboard motor to dinghy floor for roof rack
Submitted: Thursday, Nov 21, 2013 at 08:58
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Jagger
Gday folks. I'm trying to work out a simple way to fix my 15hp outboard to the floor of my dinghy so I can winch them together on to the roof. Obviously space and ease of use is a factor. Any suggestions and/or photos would be a big help as I'm struggling to find any examples on the net. Cheers
Reply By: Herbal - Thursday, Nov 21, 2013 at 10:25
Thursday, Nov 21, 2013 at 10:25
Might need a bit more information to give a direct answer...But if it's of any use I can think of some suggestions.
Is it 4 or 2 stroke? If it is 4 then you will be limited to just how far you can tilt it (or lay it flat). If it is 2 stroke you only have to worry about the gear oil when laying it flat.
15 is quite large to be taking off and putting on every time you want to use it. It might be worth looking at a small 2 stroke... I have a 2.2 Suzuki which you can pick up in one hand. It pushes a 12 foot tinnie along with 2 people on board quite
well. I bought it new and I think it was about $780.
A 15 plus the boat might be over your roof rack weight limit. If the motor is fixed to the floor then inverted, you will have the weight of the motor "bouncing" in that one spot on the hull...I just had a look, my 6hp short shaft Mercury weighs 31.1kg. The Suzie is in a corner so I can't get to it to see what it weighs. So let's assume your 15 weighs about 50 to 60kg, that is a lot of weight to put in one spot on the hull. You might want to get a boat builder or engineer to look at it and give an opinion.
I assume you are towing something...A trailer or caravan. Maybe you could rig a bracket or maybe even just a trolley, and carry the motor on or in your trailer/van.
AnswerID:
521817
Follow Up By: Brian 01 - Thursday, Nov 21, 2013 at 10:44
Thursday, Nov 21, 2013 at 10:44
I have to agree with Herbal regarding the weight limitations.
You are roughly doubling the weight on the rack, which may or may not be OK depending on your vehicle and roof rack combination.
Then comes the problem of getting the lot up there, It will require a large effort on a manual winch type loader such as the Rhino rear one, the Rhino electric will not handle it as you will surely strip the quite weak worm gear assembly, and from what I have seen of side loaders, all of them would collapse before the boat was on the roof.
Then you have the concern of all that weight suspended from the hull and what happens if it comes adrift in transit.
My personal advice would be to put it somewhere else.
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Follow Up By: Jagger - Thursday, Nov 21, 2013 at 11:58
Thursday, Nov 21, 2013 at 11:58
Yep understand your concerns so just exploring my options and the possibilities. I've got a 2 stroke 15hp yammy weight 38kg and dinghy at 80kg so total of about 118kg. The roof rack is rated to 200kg and I have a 1500kg remote operated winch located on bull bar with dyneema with latch to rear of landcruiser. It goes up over rear mounted rollers......a breeze with dinghy alone and will
test both in next few days under temp arrangement. I thought there might be some existing system around or something cheers
FollowupID:
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Reply By: Member - bungarra (WA) - Thursday, Nov 21, 2013 at 16:09
Thursday, Nov 21, 2013 at 16:09
All of what has been said makes a lot of sense.
I have my outboard (15hp 2 stroke mercury ...similar weight to yours) ) on the back of the caravan.....the boat is on a Custom Boat Loader and there is sufficient weight capacity ( on the roof as
well as the floor of the loader) for me to do something along the lines of what you have suggested if I wasn't towing the 'van...so I am interested in the replies and solutions
Have you thought about strapping the motor to the dingy as you intended.....but once it is up on the roof then somehow dropping the motor onto the roof rack floor?
This way the motor is winched up easily as per your original post but during travel the motor is resting/supported on the roof rack base.....thus eliminating the stress on the dingy
bit tricky the mechanism to lower the motor off then back to the boat for loading/unloading...but a bit of thought could get around it perhaps?..a cradle / sling of some sort that is easily lowered the short distance down / up
just thinking outside the aquare a little
AnswerID:
521832
Follow Up By: Jagger - Thursday, Nov 21, 2013 at 16:33
Thursday, Nov 21, 2013 at 16:33
Yeah good idea.just how to that's all. I could winch up the motor separately but how would you do that without hitting the vehicle because there's no leverage or nothing to slide up
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Follow Up By: Member - bungarra (WA) - Thursday, Nov 21, 2013 at 16:50
Thursday, Nov 21, 2013 at 16:50
Definitely need the motor contained inside the dingy for on/off
if the motor was strapped to a board/plank/...(timber or Ali.) that was slung across two seats with the motor hanging down inside {towards the floor of the dingy} for protection/clearance then with a bit of thought the plank to which it is strapped / bolted could then be lowered onto the roof rack floor...
this way the plank is flat on the roof rack floor and the motor remains strapped to that....still insitu in relation to the dingy....but supported by the roof rack floor not the dingy
....maybe even the motor inside a purpose built box....protected and maybe easier to strap down.......doesn't have to be too fancy how it is attached to the boat....its going up and down to the roof, not travelling anywhere
Easier said than done but feasible with a bit of brainstorming.....I haven't really stopped to give it deep thought....just off the cuff quick idea that's all
FollowupID:
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Follow Up By: Jagger - Thursday, Nov 21, 2013 at 17:50
Thursday, Nov 21, 2013 at 17:50
it got the better of me so I had a
test run over past hour. The motor has a cowling cover plus full cover so I lowered the winch latch down the side of the landcruiser down the rear door as a ramp sort of thing. When the motor got as far as I could get it I climbed on the rack and lifted the motor only slightly to unlatch then lifted on to the rack. Did the same in reverse. Easy!! Dyneema rated to 3tonne and winch on bull bar to 1500kg and latch to 3T so I reckon it wont fall.....only me right. Unless I think of something better I can actually rely on doing everything myself and not rely on my 8 year old son or wife. I like your idea of strapping to a box or plank but its how I unlatch or lift and latch it again is the hard one.
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Follow Up By: Brian 01 - Thursday, Nov 21, 2013 at 19:04
Thursday, Nov 21, 2013 at 19:04
I suggest that you remove something of similar bulk but lighter from inside the vehicle to make room for the motor in there, then put the lighter item/s on the roof.
Much easier to get both on and off, less chance of injuring yourself - a sore back can severely hamper your holiday, less chance of a heavy missile coming off the roof in an accident.
Provided you rigidly secure the motor in the vehicle, it will be safer in there.
Unless you have a portable trailer, I'm not keen on the practice of mounting an outboard anywhere on a van as you then have to relocate it to the car when putting the boat in the water. No point doing the job twice, or four times if you also count the return journey.
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Follow Up By: Jagger - Thursday, Nov 21, 2013 at 21:44
Thursday, Nov 21, 2013 at 21:44
the wife might be a bit sour on the motor in the car but I have to say what choice have we got. I agree about the lighter stuff on the roof rack though. maybe I can make that work somehow
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Follow Up By: gbc - Friday, Nov 22, 2013 at 06:23
Friday, Nov 22, 2013 at 06:23
http://www.exploroz.com/Vehicle/Boats/Roof_Toppers.aspx
There's a shot of a tinny with an ally frame in it for the outboard.
Note, it's not only 4 strokes which need to be stored a certain way, your 2 stroke manual will show the correct way to lay it down (usually on it's back with the mounts in the air) so the water drains properly.
Your idea is sound, and has been done before. Just needs the correct mount inside the boat, and the correct orientation for the motor when in the travel position.
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