rooftop tiny upsidedown,no right way up
Submitted: Monday, Nov 10, 2008 at 14:59
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dagwill
we have all seen boat loaders that carry tinies upsidedown on the roofrack
i want to make one that carries my tiny right way up
any ideas please.
i realise the air flow wanting to lift the boat rarther than push it down onto the roofrack,so dont go there please,
Reply By: Flywest - Monday, Nov 10, 2008 at 15:05
Monday, Nov 10, 2008 at 15:05
When it fills with rain your tyres might pop - o your breaks fal or roll over with all that weight up there!
Theres a reason to have them up side down.
Its because having them the other way up is STOOPID!
Cheers.
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Follow Up By: Axel [ the real one ] - Monday, Nov 10, 2008 at 20:02
Monday, Nov 10, 2008 at 20:02
Stoopid ??? you obviously have never heard of boat covers ,,,
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Follow Up By: slammin - Tuesday, Nov 11, 2008 at 16:38
Tuesday, Nov 11, 2008 at 16:38
Remove the bungs Flywest....
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Reply By: robak (QLD) - Monday, Nov 10, 2008 at 15:12
Monday, Nov 10, 2008 at 15:12
Air flow will not necessarily want to lift the boat. Like the wing of a plane, an upside down boat is more likely to lift.
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Follow Up By: Member - Oldplodder (QLD) - Monday, Nov 10, 2008 at 18:08
Monday, Nov 10, 2008 at 18:08
Exactly, he is after better fuel consumption by decreasing weight.
The faster he goes, the lighter the car is.
As long as you remember to pull the bungs so the rain can drain out.
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Follow Up By: Member - Glenn D (NSW) - Monday, Nov 10, 2008 at 18:50
Monday, Nov 10, 2008 at 18:50
Yeah , when he gets whatever fourby he has ,fully loaded for travelling ,with a tiiny on top , over 250kph it may produce lift.
ROTFLMAO
Glenn.
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Follow Up By: Off-track - Monday, Nov 10, 2008 at 22:31
Monday, Nov 10, 2008 at 22:31
Unfortunately the extra drag associated to produce that lift will far outweigh any benefits. Not to mention the turbulent airflow under and inside the hull.
BTW lift can be produced at very low speeds, depending on airofoil shape.
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Follow Up By: Off-track - Monday, Nov 10, 2008 at 22:33
Monday, Nov 10, 2008 at 22:33
...or aerofoil even
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Follow Up By: Member - Glenn D (NSW) - Tuesday, Nov 11, 2008 at 08:51
Tuesday, Nov 11, 2008 at 08:51
Bernoulli's Principle.
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Follow Up By: Member - Luke (SA) - Tuesday, Nov 11, 2008 at 22:34
Tuesday, Nov 11, 2008 at 22:34
Maybe if he leaves the bungs in and it fills up with
water he wont have the problem with "taking off" lol
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Reply By: MP - Monday, Nov 10, 2008 at 15:17
Monday, Nov 10, 2008 at 15:17
I would suggest a large version of the cradles that hold kayaks/canoes to roofracks. Or mayby some sort of frame with keel rollers & hull supports that could be removed from roof bars when not in use. Just like a small trailer with no
wheels.
Cheers
Mark
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Reply By: Member - Ian W (NSW) - Monday, Nov 10, 2008 at 15:51
Monday, Nov 10, 2008 at 15:51
PLEASE!
Don't even go there.
Until you have been caught in a torrential downpour on a long down
hill run you have no idea just how much
water can build up in your boat, even with the bung removed. I've been there and done that and got the T-shirt to show I survived.
I can only imagine the potential consequences of inadvertently leaving the bung in the transom. Don't think you won't do it, we all of us have at some stage done just that, just the same as we will all launch our boat at some stage without inserting the bung.
Ian
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Follow Up By: Member - Willie , Sydney. - Monday, Nov 10, 2008 at 18:12
Monday, Nov 10, 2008 at 18:12
Yep,
I saw a canadian filled with
water do a lot of damage to a Subaroo lid.
Willie
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Reply By: Custom Boat Loaders- Monday, Nov 10, 2008 at 18:16
Monday, Nov 10, 2008 at 18:16
Can we ask why?
Di
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Reply By: Member - Norm C (QLD) - Monday, Nov 10, 2008 at 21:09
Monday, Nov 10, 2008 at 21:09
I had a discussion with a guy when I was on a recent trip. He had the same idea. He coudn't quite explain why he wanted to do it. He just did. Hethought it was the natural order of thigs. I think he just wanted to stand out in the crowd.
Afer about 10 minutes of discussion and a couple of beers, he had changed his mind. Some of the issues discussed:
air flow
rain - even with cover (no use in downpour) and bungs out
more difficult to load, no matter what system you come up with.
more weight required for the loader / racks due to extra support needed under hull
The gunwales are the strongest part of the boat, but you don't use them
You lose the ability to store stuff under the boat in a very dry secure area.
I think there were lots more. Give me a couple of beers and I might remember them.
Norm C
Norm C
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Follow Up By: Geoff (Newcastle, NSW) - Monday, Nov 10, 2008 at 21:17
Monday, Nov 10, 2008 at 21:17
I'm shouting,
Start talking,
Geoff
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Grey hair is hereditary, you get it from children. Baldness is caused by watching the Wallabies.
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Follow Up By: Member - Norm C (QLD) - Monday, Nov 10, 2008 at 21:34
Monday, Nov 10, 2008 at 21:34
Thanks for the offer Geoff. I generally don't like my beer quite that dry though.
Norm C
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Reply By: OzTroopy - Monday, Nov 10, 2008 at 21:20
Monday, Nov 10, 2008 at 21:20
You will need two frames ... one made to match the shape of the hull and another, to get the boat up on the rack under control ( ie no tipping on the keel ). Or one frame and an elaborate, extendable, rack system.
Going to be an awful lot of engineering and weight, compared to normal upside down carrying, which only requires a couple of rollers per side, as a minimum.
All this is going on a new vehicles, gutter/roof mounted rack system or have you got an old 40 series, with a chassis mounted mounted overhead rack system to support it. ?????
Dont worry about the air lift issue ... the outside, upper edge of the vehicle will be be at least 600mm higher than normal requiring considerable thought when driving under branches / awnings etc.
Upside down, the additional boat height is more centred and away from obstacles.
AnswerID:
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Reply By: Member - John M (NSW) - Tuesday, Nov 11, 2008 at 09:00
Tuesday, Nov 11, 2008 at 09:00
Stay with the conventional upside down storage and travelling method and get yourself a Jamic Boatlifter and all of your problems are solved. One person operation, the best boatlifter on the market and won't break or damage your vehicle and you can store your tanks and extra gear in your roof rack if you have one.
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Reply By: Member - Barnesy - Tuesday, Nov 11, 2008 at 09:06
Tuesday, Nov 11, 2008 at 09:06
Dagill, I suppose if a roof topper is right way up then you don't need to lift it onto or off the roof at all. Simply drive into the
water until the
water level is above the roofline and high enough to make the boat float!
To pack the boat away simply drive the car into the
water again and position the floating tinny over the submerged roof rack. Simple.
But seriously Dagwill, don't do it. It will cause more headaches than it's worth.
Barnesy
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Follow Up By: Member - T N (Qld) - Tuesday, Nov 11, 2008 at 14:12
Tuesday, Nov 11, 2008 at 14:12
Barnsey, you clever bugger! wish I had thought of that.
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Reply By: dagwill - Tuesday, Nov 11, 2008 at 09:49
Tuesday, Nov 11, 2008 at 09:49
thanks for all thoughts and warnings,that i do appreciate
several people have asked WHY,,,,,next time you see someone about to load a boat onto a trailer try suggesting to them that it would be easier to remove the motor and all the gear inside and turn the boat upside down and put it on the trailer
warn them about leaving bung in etc.
my thoughts were 2 or three stage cradle
first one going from ground level to rear of roof,winch boat up onto that then winch that whole cradle onto roofrack
motor still on boat most gear still inside,2 minute load and gone, you dont need a second car to put all the STUFF in
why has my rear window decreased in height?????
AnswerID:
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Follow Up By: Member - Norm C (QLD) - Tuesday, Nov 11, 2008 at 11:17
Tuesday, Nov 11, 2008 at 11:17
Dagwill, you have not said what sort of boat and motor you propose to do this with. Probably the most popular roof topper is a 3.5 to 3.7m tinnie with 15 HP 2 stroke outboard. Together they weigh over 100KG. Add fuel
tank, safety gear etc (no point in taking this stuff out - you lose the benefit of the idea), plus loader and rack, my guess is you are now up around 150 KG or more. I don't know of any standard vehicle roof that will take that load. And I'm assuming the motor will be hanging down over the back of the vehicle. That is a lot of weight to cantilever off the back of the vehicle.
Since you say 'you don't need a second car to put all the STUFF in', I'm assuming you don't have a ute that you can put extra strong racks on. By the way, I don't know of anyone who uses 2 cars to manage a roof topper.
Perhaps we all lack your imagination and ingenuity. But it is worth considering all the points raised here in caution during your thought process.
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Follow Up By: dagwill - Tuesday, Nov 11, 2008 at 15:39
Tuesday, Nov 11, 2008 at 15:39
thanks norm
3.7 tinny with 6hp motor 10ltr
tank
l84 landcruiser, when all my
camping equip is in the back, its a pain to try to add all the stuff out of the boat, oars etc
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Follow Up By: Member - Norm C (QLD) - Tuesday, Nov 11, 2008 at 17:29
Tuesday, Nov 11, 2008 at 17:29
I carry the boat (upside down) on racks, with fuel
tank, all safety equipment, seats, fishing gear, removable floor and lots more on the roof racks under the boat. Even the expensive reels etc are up there as you have to remove the boat to get to them.
A lot of this stuff (fuel
tank, seats, life jackets etc) is bulky but very light - so ideal for the roof.
Norm C
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Reply By: Member - Oldplodder (QLD) - Tuesday, Nov 11, 2008 at 10:02
Tuesday, Nov 11, 2008 at 10:02
Sorry about having a bit of a go at you earlier. :o)
I have put small boats on the roof the right way up, sabots and such like, and it worked
well since two of us could lift it up to the roof racks on it's cradle. As you say, you can store things inside and under the cover.
But anything over a couple of metres, or not a canoe, I have found it easier to store upside down. Main concern is the weight on the roof. So most items removed.
Trailer is a different option since they can carry more weight, and the boat is usually heavier, therefore harder to turn over, so storing/loading gunwales up an easier option.
Sorry, still can't see the advantage in putting it on the roof gunwales up, compared to the ease of loading gunwales down. I usually take everything out of the boat when it comes in to give it a clean anyway, and less weight up top is an advantage.
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Reply By: Wizard1 - Tuesday, Nov 11, 2008 at 10:57
Tuesday, Nov 11, 2008 at 10:57
Every now and again you come across a post and think to yourself
" this person has too much time on their hands and nothing else to think about" shortly followed by "what planet are they on?"
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Follow Up By: dagwill - Tuesday, Nov 11, 2008 at 15:33
Tuesday, Nov 11, 2008 at 15:33
it feels good not to be a lemming
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Follow Up By: Gramps (NSW) - Tuesday, Nov 11, 2008 at 17:24
Tuesday, Nov 11, 2008 at 17:24
LOL good response dagwill
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Reply By: Axel [ the real one ] - Tuesday, Nov 11, 2008 at 19:20
Tuesday, Nov 11, 2008 at 19:20
A few months back saw some boats carried rightway up , 1 was a 16 ft ally with 40 hp honda 4stroker on boat trailer on the roof of a pantec type trailer towed by a custom liveaboard bus , pantec held a baby Suzuki 4x4 to tow boat and also stored the custom Goldwing motorbike + a scooter. ,,, that was in
Alice Springs for the Goldwing convention ,,
other boat carried right way up was at Perrys on the Daley [river] ,and it was a 12ft tinny ,20hp honda 4stroke on boat trailer which was mounted above an open framed car trailer carrying once again a baby Suzuki 4x4 , difference this time was boat and boat trailer faced to the rear and a system of pullies and wires allowed for the rig to be wound down when the suzi was off the trailer , Think Outside The Square ,, it can be done !!!!!
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