G'day,
The beams run on rollers, but wedge into solid supports once they are
in position. A sharp pull should get them started, then they are
easily slid out. Telescoped, they are 3.5m /12' long and weigh 27 kgs
each, so will be a heavy lift for one, but not impossible.
I pulled harrigami at 700 kgs/1,540 lbs on a big and heavy two axle
trailer with my 1.6 litre 4 cylinder car. Not particularly fast, and
very thirsty, but no big deal apart from going round tight corners.
Length is only a drama going round corners when the tail swings out or
it cuts the corner. The former is reduced by having the wheels a long
way back (articulated trucks), the latter by having them a long way
forward (buses). I find it easier to see the corners I am cutting,
rather than someone out the back that I am side swiping.
Regards,
Rob
On Tue, Jun 3, 2008 at 5:51 AM, captian_rapscallion
<captian_rapscallion
>
>
> I really have no frame of reference when it comes to estimating how
> easy or difficult it would be to set up of tear down the proa. Rob,
> would taking the beams off after the boat is on the trailer have to be
> a 2 person job?
>
> I have pulled e scows with my car in the past with out a problem, I
> may be way off base here but pulling that boat wasn't too difficult.
>
> I don't know if the extra 10 feet would have a huge impact - it didn't
> seem to matter that much when I took my turn driving when towing an A
> scow.... not with my car, but I think I got the rough idea what I was
> up against.
>
> --- In harryproa@yahoogrou
>>
>> G'day,
>>
>> Correct about the rudders. Not ideal, and could be corrected by
>> mounting them on a sleeve on the beam, as per Robert's suggestion.
>> trade off is telescoping width, or overall width. Mast head is
>> 16.2m/53' off the water. Low for a 12m race multi, cloud scraping for
>> a sub one ton boat.
>>
>> regards,
>>
>> Rob
>>
>> On Sat, May 31, 2008 at 9:50 PM, Gardner Pomper <gardner@...
>> > I had a couple questions. Were you going for engineless, or are
> you planning
>> > on mounting an outboard somewhere?
>> >
>> > Also, it looks like you can't retract the rudders and still steer,
> so I was
>> > wondering what the draft is.
>> >
>> > Just for curiosity, what is the masthead height above the water?
>> >
>> > Thanks,
>> > - Gardner
>> >
>> >
>> > On Sat, May 31, 2008 at 8:32 AM, Raps callion
>> > <captian_rapscallio
>> >>
>> >> I love the trailerable design. It exceeds my expectations in
> almost every
>> >> respect.
>> >> The part I love the most is the building cost and the bruce number.
>> >>
>> >> I would love to see another design with 6' headroom, trailerable,
> a bruce
>> >> number
>> >> this high, and at this price.
>> >>
>> >>
>> >>
>> >> ----- Original Message ----
>> >> From: Mike Crawford <jmichael@..
>> >> To: harryproa@yahoogrou
>> >> Sent: Friday, May 30, 2008 8:56:53 PM
>> >> Subject: [harryproa] Re: Trailer proa
>> >>
>> >> Rob,
>> >>
>> >> The trailerable proa looks wonderful. I was skeptical at
> first, but now
>> >> that you've upgraded the renderings, I can see that the boat
> really does
>> >> have some character of its own.
>> >>
>> >> That's also a great mast stepping solution. Some tri's require a
>> >> trailer to step/unstep, and that's not very useful if you're
> moored or at a
>> >> dock. Others have a-frames or gin poles, which help, but which
> also create
>> >> some serious stresses on the mast base. They are also more
> suited for a
>> >> rotating mast that fits onto a ball than for an unstayed rig that
> needs to
>> >> be lowered several feet into a hull. This is probably the
> simplest and most
>> >> stress-free solution I've seen.
>> >>
>> >> The number of trailerable boats with this level of performance and
>> >> accommodations can be counted on one hand, with a few fingers to
> spare.
>> >>
>> >> Nice job.
>> >>
>> >> - Mike
>> >>
>> >>
>> >> Rob Denney wrote:
>> >>
>> >> G'day,
>> >>
>> >> Trailer proa renderings are in the Files section under Maxi
> Trailer sailor
>> >>
>> >> 'The ultimate trailer sailor/racer cruiser' is the requirement for
>> >> this boat. As fast as possible, with standing headroom, minimal
>> >> galley, double bunk and a toilet. Trailering is mostly for the 5
>> >> mile trip from home to ramp, but occasionally further afield.
>> >>
>> >> Windward hull is 7m.24', leeward hull 12m/40'
>> >>
>> >> The boat is 6m/20' wide in sailing trim, but telescopes to 3.7/12'4"
>> >> wide for marinas and 2m/6'8" wide on the trailer. This is easily done
>> >> with composite beams. The mast and boom travel in cradles on the lw
>> >> hull deck, the beams under the cockpit. The trampoline is in two
>> >> pieces split fore and aft. Each piece has a 25mm dia carbon or alloy
>> >> tube sitting in hooks on the hull and the beams. In the middle is a
>> >> thicker tube for each piece. When telescoping for marina use, the
>> >> lee hull tramp is lifted out of it's hooks and as the hulls slide
>> >> together it slides over the windward tramp, so you can still walk
>> >> across to the other hull. For light air races, it can also be sailed
>> >> like this. For trailering, the tramps and the telescoped beams are
>> >> quickly and easily removed and stored under the the cockpit.
>> >>
>> >> The mast is telescoped to 9.2m for stepping/unstepping . A 5m long
>> >> pole, with a 4;1 blocjk and tackle on one end is inserted into a hole
>> >> in the deck next to the mast. The heel sits in a cup next to the mast
>> >> step. The blocks are tied around the mast at it's centre of gravity
>> >> approx 3.7m from the base and it is lifted up until the heel is above
>> >> the deck, then guided into the top bearing and lowered into place.
>> >> Unstepping is the opposite. Very quick and very safe.
>> >>
>> >> The reefing drawing shows sail areas incl mast of of 47 sqm/505 sq',
>> >> 35 sqm/376 sq' and 22 sq m/236 sq m. Storm sail is 2 sq m/22.5 sq' of
>> >> mast. Lots of sail up high for the light stuff, no drag or weight up
>> >> high for the heavy.
>> >>
>> >> Weight in sailing trim is 420 kgs and the payload 330 kgs/726 lbs.
>> >> Overload could be as much again without it affecting anything but the
>> >> speed.
>> >>
>> >> Construction method for the hulls is partially glassed panels joined
>> >> and compounded, with flat panels for the rest.
>> >>
>> >> Bruce number empty is 2.34. With normal payload, 1.9. Hull flying
>> >> wind speed 10 knots, lower with the crew sitting to leeward.
>> >>
>> >> Inside the ww hull is a double bunk at one end and the galley and
>> >> toilet at the other. The galley space is large, but not all of it is
>> >> accessible. It will probably end up being accessed through a deck
>> >> hatch and used for storing fenders, etc.
>> >>
>> >> The cockpit is sheltered with a folding pram hood which will
> ensure dry
>> >> sailing.
>> >>
>> >> The rudders could not be mounted on the telescoping beams, so are in
>> >> daggercases in the hull. Rather than use long tiller extensions,
>> >> there is a short athwartships tiller (magenta in the renderings) with
>> >> an extension (green) attached to the tiller and a car on a track on
>> >> the deck. The car is pulled fore and aft by lines running to
>> >> whipstaffs (vertical tillers, red) on the leeward end of the
> cockpits.
>> >> The lines are cleated on the whipstaffs so can be released and easily
>> >> replaced and retightened when the rudders are lifted and lowered.
>> >> This is a far easier system than wheel steering where the lines must
>> >> be released off the quadrants to raise the rudders.
>> >>
>> >> Comments, suggestions, criticisms welcome.
>> >>
>> >
>> >
>>
>
>
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