Jump to content
Sign in to follow this  
Richard98

Alternative build

Recommended Posts

Decided to use up my old stock of cedar planks ( at least 3 boats worth) and build a modern One Metre. Thanks Brad, have gone for your "Alternative" design. Super efficient looking lines and looks a little tricky to plank up.

Picture of starting point. Note the string passing through the 2mm datum holes in each shadow, each one is aligned by shining a bright light from the end and sighting down the hull.


Richard

 

alt-01.thumb.jpg.c8a6a18478d02ca7957b391f69910bba.jpg

Share this post


Link to post
Share on other sites

Thanks for the comment Mike.

Thinking of a lowered deck aft of the mast to avoid a mast well. I know the current fashion is back to flat aft decks but It is easier, lighter and stiffer for a timber boat than a multi part well or inserting an Ikon or similar moulding.

Some more pics of progress. Rough trimmed and sanded hull.

Richard

IMG_4837.thumb.jpg.3ca461ccde248359c89db5eaa63da8be.jpg

IMG_4838.thumb.jpg.ba12f3413354aed7651afaea2fc46709.jpg

Share this post


Link to post
Share on other sites

Hi Richard,


Looks great, hope you are going to keep the updates coming as the build progresses.


Regards


Mike

Share this post


Link to post
Share on other sites

Finished the easy bit last week; planking the hull. Epoxy coated and 50 gsm lined. Weight a constant factor. The peel ply on the inside removed 35 grams of surplus resin!

Fiddly bit now: setting up mast / fin box.

Richard

IMG_4853.thumb.jpg.c9cc74d55e60361673b1c70e7c54e686.jpg

Share this post


Link to post
Share on other sites

Good work the photos are very helpful. I'm about to start planking an Ellipsis and am a bit concerned about the process, I understand the planking but not sure about what epoxy to use etc etc. Please update as you move forward.

Share this post


Link to post
Share on other sites

Stephen, sorry for delay in responding. Boat has been on "back burner" for last few weeks.

Everyone has their favourite adhesives. I use the following:

SP 106 for structural filleting etc.

XCR coating epoxy from Easy Composites for coating. It has built in UV protection.

Aliphatic resin from Deluxe adhesive for planking. Easy clean up so all excess can be removed with the usual eye to keep weight off. It sets waterproof.

Picture to date. Ready for deck.

Richard

IMG_4896.thumb.jpg.4ba0e278dc767530307612dc25e20205.jpg

Share this post


Link to post
Share on other sites

Hull finished, just requires tidying up and a final thin coat of epoxy, which will be flatted back with 1200 wet and dry. Then setting the trim for ballasting the fin.

Note that I have straightened out the centre line of the fore deck. Brad's drawing shows a sharp curve towards the bow. The sheer retains the sharp upturn but the deck would have been tricky in wood and heavier to achieve; requiring intermediate deck frames. The drawing does show these however.

Richard

IMG_4917.thumb.jpg.f18cee7a9cf48db081193f986133bd4d.jpg

Share this post


Link to post
Share on other sites

Hi Richard,

I've just finished building my Alternative and I am in the process of rigging it. I have used a planked balsa wood contruction sheathed both sides in fibre glass mat using light weight epoxy resin. Weight of painted hull with winch, servo,pot, battery and receiver is 855 gm's. I wanted a total weight under 4 Kg. In a test tank the boat floats perfectly on her waterline. I am having a problem fitting a mast ram at the moment, there isn't enough room between the bulkhead and the mast.

I have attached 3 photos but the resolution is greatly reduced in order to send them.

Roger

123323364_alt3com.thumb.JPG.0b81c7f5a1ed8679cc61f54b81ef76dd.JPG

153638718_altcom2.thumb.JPG.30285ae9ac9f0485734b778d45ec54b3.JPG

732177100_altcom.thumb.JPG.2e22b3760310b6d93882bb53929bc16f.JPG

Share this post


Link to post
Share on other sites

Hi Roger, looks stunning really beautiful finish.

I achieved practically the same weight. My bulkhead in front of the well gives me nearly 15mm to mast leading edge so I have plenty of room for ram. Picture attached. May be a bit of surgery to your deck for a recess to accept the ram screw. Let me know your solution.

My problem is the kicking strap fouling the winch lines emerging from the bulkhead. All as the drawing so I will have to devise a wire kicking strap with the tension screw inside the boom or something. All ready to sail apart from this hiccup !

Richard

IMG_4945.jpg.d362bf2f827b512729fa53c399e2fa04.jpg

Share this post


Link to post
Share on other sites

Hi Richard, looking at your picture, one change you could make would be to lower the bulkhead exits so the lines come out below deck level. There is little friction added where the lines rub on the edge of the recess but it allows the kicker to swing free. Also use a kicker with a slim rigging screw.

Also from your picture I would say that your jib sheet deck eyes are a little too tall which will give you problems with sheets getting wrapped around them - an easy way to put unnecessary strain on the winch.

Cheers,

James

Share this post


Link to post
Share on other sites

Thanks for your comments James, the solution was indeed easy. I have re positioned the fairleads right in the corner of the foredeck side deck transition.

Just wish I had checked before slavishly following the drawing. I already had the lines only 1mm higher than the deck. I have removed the knurled wheel from the Sails etc kicking strap and all is clear now. Point taken about the sheet eyes, probably look a little higher because of the picture angle, but could be lower I agree.

Richard

Share this post


Link to post
Share on other sites

Hi Richard,

You're more advanced with your Alternative than I am, I'm still fiddling around with the rigging. Regarding my mast ram problem of insufficient room between the mast and ram.The reason is because I positioned, by mistake, the fin/mast box 5 mm further forward than the plan so I hope this dosen't affect the balance too much.

I notice your ram takes up less space but doesn't provide lateral support, this may be my only option.

I also have the same problem as you with the kicker strut fouling the winch line. One reason is that the SAILSetc plastic compression strut has a very large knurled adjustment in line with the edge of the cockpit. Also initially I used the SAILSetc fixing point on the boom instead of Brad's position which is much closer to the mast so I shortened the wire and repositioned it, this gives more clearance however it didn't cure the problem completely so I have ordered a SAILSetc reverse strut which has the adjusting screw nearer the boom.

Can you tell me what the final total weight of your boat was before correctors were added and does the boat feel balanced? Also how much rake have you set?

Regards,

Roger.

Share this post


Link to post
Share on other sites

Hi Roger,

As long as the finbox and mast are all 5mm further forward the balance should be similar; the rectangular rudder reduces the effect of the hull rocker on the lateral position so the main effect will be to change the trim a little. But do note that Brad has placed these components deliberately and not where I would have expected; which is what has made this build particularly interesting.

I went for the simple ram and accept that there is no lateral support. I have tried extending the deck on other designs to form mast partners but the horrific snags on lines were not worth the bother.

The kicker problem: easily solved. I re positioned the fairleads as shown on the picture and filed off the Sails etc knurled top (using a drill and file) The lower plastic locking wheel just clears the fin bolt. I may reduce this also. The yellow tape provides grip to adjust. All clears now. I did consider the Sails etc reversed kicker however.

I set the mast vertical, by measurement and set the forestay accordingly. Then I drilled additional holes at the forestay attachment on the mast at 6mm intervals down. See Lester Gilbert's comments on mast building. This gives 1 degree of rake per hole. First sail experience was very encouraging. Perfect balance but a tad twitchy in gusts. This could be more to do with sail settings - must experiment more.

Total weight ready to sail is 3795grm so I have 110grms of lead in the bow. A shame to have to put it there but that trims the boat exactly as Brad has drawn. Not as light as my epoxy glass hulls but much much stiffer, which may count for something.

Any comments, advice or just critique, welcomed.

Richard

National championship race costs.xls

IMG_4993.jpg

Share this post


Link to post
Share on other sites

Last pics for anyone still interested. All trimmed now and epoxy final finish applied; plus "ALTERNATIVE" logo from Brad.

Richard

IMG_5159.jpg.65c1ccb75f1b41a88a5f94c3b03a1ab9.jpg

Share this post


Link to post
Share on other sites

Second picture here. Cannot download more than one at a time. Preview shows both but after submitting one is deleted.

 

IMG_5158.jpg.d05f6b78d1891ef753245070418a3265.jpg

Share this post


Link to post
Share on other sites
Quote

Second picture here. Cannot download more than one at a time. Preview shows both but after submitting one is deleted.

Richard i will look into this in the morning you should be able to post more than one picture (think limit is around 3 per post)

Garry

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...