2 Way Power Winch

[JohnI.Stephen]

I have just seen an advert for a 'Kos Media' 12 Volt 2 Way Power winch. "1000 Watt 12 volt 0.85hp delivering 2000lbs of line pull; all this for £79.95.

I need to gently lower my caravan down a slight slope and this would appear to be ideal. Any experience of this please?

 

[Icemaker]

John, 2000 lbs is only just over 900 kgs, your van would have to be tiny for the winch to move it up any sort of gradient. very few vans weigh less than 900 kgs so the winch looks pretty useless for the job you state.

 

[parker1158]

Hi John

Agree with Iceman. Check out E-Bay I got a 6,000lb winch from there that hooks onto the towball, cost about the same as the one you describe, may not be the same quallity but hey it does the job. Pulls my 1300kg van up my steep drive no probs.

 

[rayc]

Icemaker, these winches are a common specification. They are 2,000 pounds pulling power, but rolling power, that is a caravan on the flat, it is 6,000 pounds and 5000 pounds a boat in water. I suppose the analogy is that my wife and I can move our 1350kg caravan on the flat but that doesn't mean we have 1350kg of pulling power.

With regards to the original query you can pick up the winches that use the car towball as the anchore for about

 

[JohnI.Stephen]

Thanks all; in fact all I need it to be able to slowly lower the van down my drive (light gardient); once it's down there, I can reverse the car and to it back up. However, reversing it down would be hard as I cannot get the room out on the road to starightent the car up without seemingly hundreds of manoeuvres !! Thanks for the tip about ebay though!!

 

[ProfJohnL]

Hello John,

Ray has correctly identified that the force/pull you require will be significantly less than the actual weight of the caravan, unless you are trying to lift it vertically!

Consider a caravan that weights 1000Kg (1 Tonne). To lift it you would reaquire a pull of 1Tonne. If the caravan is on a 45 degree slope, to pull it up the plane of the slope you would need 500Kg pull, and teh lower teh slope teh less pull you would need. You obviously have to overcome the rolling resitance which adds a little bit perhaps 50Kg. As a rule of thumb if you divide teh weight of teh caravan by the angle of teh slope, and then add 20% (to overcome rolling resistance and compensate for teh approximation of a rt angle only having 90 degrees compared to 100 degree) you will estimate the minimum pulling power you will need to move the caravan.

So assuming 1200Kg caravan (MPTLM) 10Degree angle slope gives 120Kg + 24Kg (20%) = 144Kg Est. so your 900KG will cope very well.

 

[ProfJohnL]

Hello John,

Ray has correctly identified that the force/pull you require will be significantly less than the actual weight of the caravan, unless you are trying to lift it vertically!

Consider a caravan that weights 1000Kg (1 Tonne). To lift it you would reaquire a pull of 1Tonne. If the caravan is on a 45 degree slope, to pull it up the plane of the slope you would need 500Kg pull, and teh lower teh slope teh less pull you would need. You obviously have to overcome the rolling resitance which adds a little bit perhaps 50Kg. As a rule of thumb if you divide teh weight of teh caravan by the angle of teh slope, and then add 20% (to overcome rolling resistance and compensate for teh approximation of a rt angle only having 90 degrees compared to 100 degree) you will estimate the minimum pulling power you will need to move the caravan.

So assuming 1200Kg caravan (MPTLM) 10Degree angle slope gives 120Kg + 24Kg (20%) = 144Kg Est. so your 900KG will cope very well.

Sorry for all the "teh"s I didnt spell check.