Home Forums General Weta Stuff Double Trailer

This topic contains 6 replies, has 3 voices, and was last updated by Paul White Paul White 2 weeks, 5 days ago.

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  • #9938
    Paul White
    Paul White
    Keymaster

    Hi Peter

    I have been in discussion with Roger at Weta Marine who told me that they had been researching a system to allow the arms to be removed from the amas using a sleeve (similar to the mast) to support the join and a clamp to hold it in place (although glue could be used for those who want a permanent setup).

    This has a benefit for a trailer (and container shipping) since it reduces the height of the boat from 120cm from the ground including the trolley (allowing for the ama arms over the top) to around 90cm (the height of the hull deck). Also the amas with fixed arms are really awkward to transport and to repair.

    It means that you can store the amas and ama arms separately  – for example putting the arms on the inner wall of an enclosed trailer.

    I am now working with John Genge at Kempsey who has built his own Weta trailer previously. I have created a 3D scale model of the design below using using Sketchup Free which you can find  here. (Sketchup is available for Windows/Mac and there’s a browser-based version too – details here)

    • This reply was modified 2 weeks, 5 days ago by Paul White Paul White.
  • #9931
    Paul White
    Paul White
    Keymaster

    I’m now more inclined to go with an enclosed trailer – my pro/con below.

    Open Trailer

    Pro
    – Lighter weight to manoeuvre and tow
    – Less affected by crosswinds

    Con
    – Requires complex “parallelogram” hinged system to allow for upper level to be raised/lowered unless you have helpers to load/unload the boat
    – Less storage space available except by adding containers
    – No protection for boats from stone chips/road dirt unless under/over covers are fitted
    – Needs to be made by specialist who has experience of building multi-level dinghy trailers

    Enclosed
    Pro
    – Protects boats from road dirt/chips
    – More secure
    – One person loading – Can use roof-mounted pulley attached to frame to raise/lower upper level boat
    – Loading system is simpler
    – Large storage area for spares, water tank (for washing boats) etc.
    – Outer skin provides good advertising opportunities
    – Easier to find a manufacturer and DIY options available

    Con
    – Heavier structure
    – More prone to cross winds
    – May be more expensive to construct (although loading system simplicity may offset these)

  • #9863
    Paul White
    Paul White
    Keymaster

    Hi Peter

    I’ve also been looking at a double trailer solution. I found this one is a simple upper frame which requires the boat and trolley to be lifted into place – fine if you have enough volunteers to help.

    I’ve also seen the parallelogram systems you’ve seen used for a Finn transporter. I think the issue with the strain on the winch can be resolved by either mounting the winch (or a pulley for the winch cable) high enough at the front – which requires a vertical structure at the front of the trailer which has bracing to take the load. Some of the double trailers seem very over-engineered (heavy) for the task – I think the real issue is to get the angles right for the winch cable.

    This is a double Laser trailer which might be good for ideas.

    Another option is to use an electric winch as shown in the examples below.

    I’ve tried attaching some UTE roll-bars to my existing Seatrail flat-bed trailer which is pretty wide – only just not wide enough to allow the Weta to fit between the uprights of the roll-bars. So I’m looking for a better solution only I don’t have a workshop or DIY skills to do the welding required.
    I had thought of using this Luggage Rack which is available from Seatrail but I am concerned about the small size of the platform.
    I’d be very interested in having an enclosed trailer  like this one which would be useful for carrying spares
    I’d be interested in joining a double purchase if you can find someone to do the work.
    Paul
    Weta Sydney
    • #9870

      timw
      Participant

      I built a double trailer for my Weta’s.  I had an enclosed trailer built that has a 7’ interior height.  This allows the first to be lifted up, the dolly wheels removed and the second rolled in on its own wheels and strapped down with wheels on.  I can load and unload by myself in less than 20 minutes.  I can get both boats rigged and in the water by myself in under an hour.   I have two to do demos so I cannot rely on second person to help load / unload or rig.  The up sides to an enclosed trailer is you can leave much of the rigging in place.  Storage is taken care of, no damage from debris while traveling on the road.

      The down side is a 7’ tall trailer is a huge wind drag at highway speeds.  I could pull it well up to 55 miles/ hour. Beyond that the tow vehicle works very hard and fuel mileage drops precipitously.  Most highways here are 70 mph.

      i built a frame in the trailer right at the back of the dolly.  There is a U ( upside down) that hinges at the floor.  This is pulled up, lifting the back of the boat, via a cable on each side tha runs to the top of the frame so the initial lifting angle is more tha 45 degrees.  This goes to a 6:1 block system attached to the floor.   The front of the dolly is lifted with a 3:1 (laser Vang) attached to the roof of the trailer.  There is a cross bar near the front of the trailer for the front of the dolly to rest on while traveling.  By alternately pulling on the two block systems I can lift the boat myself.

      if I had to do it over I would seriously study building strainer that held the boats fore and aft.  Yes it would long, but the trade off to pull with a smaller vehicle would be worth it.  Another option if you have pickup truck would be to load one in the truck and pull the other.

       

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    • #9866

      Peterh
      Participant

      Thanks Paul, great data there. The Weta has unique challenges with the weight and footprint and height of the package so the suggestion from one fella of a fore and aft trailer could be easy but loooong. I would really like to find the details or even a picture of the trailer I saw in Germany which took 3 dinghies. It had 4 posts with winch(es) that wound the first boat in vertically upwards in the same way the posts in a Jayco camper wind the roof up. On this model the top boat was locked with pins and then the winch(es) used to wind up the next boat and so on.

    • #9867
      Paul White
      Paul White
      Keymaster

      I agree a fore and aft trailer would be way too long – you’d have immense difficulty parking it let alone backing into a space.

      The enclosed trailer I posted previously would seem to be a possible easy solution since the top boat seems to be winched into place using pulleys attached to the frame across the roof. I’m trying to contact the owner to find out.

      The other thing that occured to me is that an enclosed horse or race car trailer might easily be modified to create a double Weta trailer and I’ve noticed a few bargains on Gumtree.
      https://www.gumtree.com.au/s-ad/gelorup/trailers/car-trailer-fully-enclosed-/1164183963

      https://www.gumtree.com.au/s-ad/old-beach/trailers/enclosed-toy-trailer-bike-trailer-kart-trailer-car-trailer/1163332308

      There’s some double trailer manufacturers here

      http://www.merseatrailers.com

      Weta Dimensions
      One thing you mentioned was the issue with the height of the Weta. My reckoning is that a second layer would need to be 1200mm from the ground in order to be clear of the lower boat on its trolley with the amas in the normal position.

      But you may be able to reduce that height if you remove the floats and stack them on top of a frame above the top boat – which is similar to the way they are transported from Batan with 4 boats in a 20′ container.

      Regards

       

      Paul, Sydney

       

      • This reply was modified 1 month, 1 week ago by Paul White Paul White.
  • #9850

    Peterh
    Participant

    Hi, Apologies if the info is here somewhere, but I have a mate who has doubled his fun by buying a weta for himself and his wife!
    Only one trailer and two trolleys, looking for any advice on converting a single trailer to double or building a double from scratch. So far he has copied a laser version which has a swinging parallelogram frame that lowers to fit the top boat, but the load on the upper winch is huge.
    Any advice or pictures VERY welcome.
    Thanks,
    Peter
    #177 AUS

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