Hi team =85.. I have a boat trailer (twin axle) which has a boat on it wei=ghing 1600Kg.On the flat I can happily pull & push trailer is a straight line - so roll=ing resistance is not too high.I have to manoeuvre the boat into a boat shed after each use =85 and for a =number of reasons I can=92t use a car other than for getting in aprox right= position.The problem is 2 fold =85 there is a slight incline until the wheels get =onto the boatshed floor (requiring a lot of effort) =85. And being a twin a=xle trailer it is very hard to move it =91sideways=92 on single axle it=92s= fine, you simply see-saw back and forth over a short distance to move side=ways - but on twin axle the rear wheels =91crab over=92 as front one trace =the arc, and then it is very hard to move.If I have a mate with me it=92s fine, but it certainly can=92t be done sing=le handed.An option I have thought of is using an electric winch, clipping winch cabl=e onto rear axle =85 my thoughts are that the winch then provides the effor=t of the =91pull=92 .. and all I have to do is then put the effort into =steering the jockey wheel.I have 220V ac there so =91maybe=92 I could use a remote control mains =91=lift/hoist=92 =85such as =85 could even set a single snatch pulley block into a fixing into concrete f=loor to make pull =91better=92My Q is =85. Does this sound logical ? =85=85=85=85 for these winches they =quote vertical lift load of 250Kg =85 (to 11.5m high) so not sure how (if i=t does) relate to a horizontal pull capability =85. This is a rolling load= not dead lift, but hard to know how to estimate how much =91pull=92 force =would be needed.The other option is the 12V 4x4 recovery winches =85 more than enough pull,= but as this would be fitting in building (not on a vehicle) no high curren=t 12V source (OK I could buy a battery=85 but 240V seems so much easier)I did ask a question a while back, and that sent me in direction of =91Powe=red jockey wheel=92 & caravan =91power movers=92...

eighing 1600Kg.lling resistance is not too high.a number of reasons I can=92t use a car other than for getting in aprox rig=ht position.t onto the boatshed floor (requiring a lot of effort) =85. And being a twin= axle trailer it is very hard to move it =91sideways=92 on single axle it==92s fine, you simply see-saw back and forth over a short distance to move =sideways - but on twin axle the rear wheels =91crab over=92 as front one tr=ace the arc, and then it is very hard to move.ble onto rear axle =85 my thoughts are that the winch then provides the eff=ort of the =91pull=92 .. and all I have to do is then put the effort int=o steering the jockey wheel.=91lift/hoist=92 =85such as =85 > I could even set a single snatch pulley block into a fixing into concrete= floor to make pull =91better=92y quote vertical lift load of 250Kg =85 (to 11.5m high) so not sure how (if= it does) relate to a horizontal pull capability =85. This is a rolling lo=ad not dead lift, but hard to know how to...

these ? ?.. >here is one I won't be building

On Fri, 09 Nov 2012 16:25:18 +0000, Rick Hughes wrote:

Hoist /Winch ... what do you think?

Nov 06, 2012 26 Replies

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Rick Hughes 13 years ago

Contacted powrlaunch .... they want £2,500 ..... too expensive

This option

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have merits but told trailer hitches that swivel (normal in UK) don't work well and you would have to prevent the swivel.

I may be back to plan A ... a winch inside the boat store pulling the trailer in. Can get these for around £25

My concern is the vertical pull is stated as 250Kg (twin wire pull) I could arrange that using a snatch pulley .... but is 250Kg going to be enough .......... can't really think of a way to estimate the pull required.

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Rick Hughes 13 years ago

these ? ?..

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here is one I won't be building

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Jules Richardson 13 years ago

There is that, although they typically seem to be based around car parts (wheels and axles in particular), and so end up a little larger than a typical garden tractor (and possibly with a far larger turning circle too if using a car's steering system)

Hmm, shout if you do! I've seen a few early (ish) commercial tractors which achieved four wheel drive by essentially coupling two regular machines together (minus their front axles) at a pivot controlled by hydrualics, but they were standard geared drive to the wheels rather than hydraulic.

cheers

Jules

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Jules Richardson 13 years ago

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Mark 13 years ago

A friend made a very usable lawn tractor out of a Reliant Robin it had i think a 4:1 reduction box bolted on the diff and mini tractor wheels. I have a photo of the thing if i can find it.

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Tim Lamb 13 years ago

In message , Jules Richardson writes

I have the use of a micro digger (Steelfab?) which uses hydraulically powered wheels for manoeuvring. It may be based on *dumper truck* technology.

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Roger Mills 13 years ago

Well, it ain't rocket science!

To pull a trailer up a slope you need a horizontal(ish) force equal to the rolling resistance plus the component of the trailer/boat weight acting along the slope (weight multiplied by the sine of the angle which the slope makes with the horizontal)

You measure the first of these by pulling the trailer along a horizontal surface by means of a spring balance. You can calculate the second.

For example, if the all-up weight of the boat plus trailer is 2000Kg, I would expect the rolling resistance to be around 25Kg. If you pull it up a 5 degree slope (approx 1 in 12) the component of the weight along the slope will be about 175Kg - i.e. 200Kg in all.

When the hoist is laid on its side, it should be able to exert a similar horizontal pull to its rated vertical lift when used normally. So 250Kg should be ok for a 5 degree slope. If it's steeper than that, you might have a problem - so make your own measurements and do your own calculations with the actual data.

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