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New boat pics - image intensive (ish)

Posted By: scooby_simon

New boat pics - image intensive (ish) - 11/21/06 08:37 PM

All,

Sorry, no pics with the sails up as we had to rush that bit due to swirling winds one minute and then nothing the next and bucketing rain.

Anyway, did get some pics of the carbon beams and the revised self-tacker. I'll get more pics in 2 weeks (cannot sail next weekend).

Front beam:

[Linked Image]

Self tacker :

[Linked Image]

Back beam :

[Linked Image]



Both beams are Carbon Foam sandwich around the beam bolts with bracing as well, the areas under the self tacker also have bracing. JP can confirm the exact structure.

Overall impression is that the boat is VERY stiff - we picked the boat up at opposite corners and there was very little (if any) sag on the bows - very impressive. I've commented elsewhere on the shape of the kite and to add that the mainsail looks fantastic. Comments on the Jib when it arrives (it will be on the max luff length thanks to the dropped bridals.

Unfortunatly we did not have time to take loads of pictures as the conditions were not kind to us. I'll take loads in 2 weeks time.
Posted By: Robi

Re: New boat pics - image intensive (ish) - 11/21/06 09:05 PM

Boat PORN! ahhahah good stuff. Keep em comming.
Posted By: Jalani

Re: New boat pics - image intensive (ish) - 11/21/06 09:09 PM

That looks sooo cool Simon. <img src="http://www.catsailor.com/forums/images/graemlins/cool.gif" alt="" />

John does do a nice job, does he not? <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" />

I do like the self tacker set-up (my Stealth has the low profile Harken version on a flat plate in front of the beam)and I fully expect the platform to be incredibly stiff with those beams.
Posted By: scooby_simon

Re: New boat pics - image intensive (ish) - 11/21/06 09:24 PM

More boat pron weekend after next.

Boat is safely tucked up at my parents for the next 10 days as I cannot sail next weekend.

The plates are Loooooooong and still cooking in the spare room as John had not long finished them (no I have not yet calculated the aspect ratio !).

If class rules allowed we could actually have had a 6.2m luff / leach as the bridals are a little down the inside of the hulls.

Only other changes are

1, Carbon mast spanner fairly close to the bottom of the mast and a 12:1 DH on the mast. Not sure I will actually use the 12:1 (might just rig as 8:1).
2, 2x Carbo ratchamtics each side for the kite.
3, Higher aspect plates (around 4.7 we think)
4, Higher aspect Jib
5, Higher aspect Kite (did not have time to measure the luff or take pics).
Posted By: Tony_F18

Re: New boat pics - image intensive (ish) - 11/21/06 10:27 PM

Very nice looking cat,
Where did you put the spin halyard cleat? On the mast or the beam?
Posted By: scooby_simon

Re: New boat pics - image intensive (ish) - 11/21/06 10:31 PM

Quote
Very nice looking cat,
Where did you put the spin halyard cleat? On the mast or the beam?


Beam. IMO mast is wrong for single handing as It's not always possible to stand up. I'll be sailing the boat single handed most of the time.

Forgot to say the Self taker is removable !
Posted By: Wouter

I really like what you guys have done with it .. ! - 11/21/06 11:35 PM

I really like what you guys have done with the boat.

Those are really good looking beams and with the eliptical front I think you stand a very good chance on cutting down on spray.

I also like the new dolphinstriker strap. Is that custom to you boat or will this also be fitted to all the new stealths. That strap will make the mainbeam very stiff under mast loads and the flatness of the strap will make it cut through waves effortlessly.

My impression of the Stealth F16's always was that they were rather stiff in the platform, with the upgrades it surely must be very stiff indeed. And that is good as I've seen the new stiffness data on the Blade design.

The competition is definately on.


Quote

If class rules allowed we could actually have had a 6.2m luff / leach as the bridals are a little down the inside of the hulls.



Yes, but don't actual go that tall. We had to decide on some limit in the rules and it turned out that the mathematical formula used in Texel/SCHRS handicap can hardly distinquish between jibs wit luff lengths in the range of 5.4 to 6.0. We didn't want to limit designes freedom to much in the F16 rules and so we just maxed out this rule. However 6.2 mtr long jibs will be extremely narrow and tall, having an aspect ratio of 10. They are most likely to be very sensitive to trim. Everybody seems to converge to 5.50 mtr long jib luffs and that seems to work out well. Also don't bring the jib too low as it will be between the hulls and therefor when lifting a hull part of the jib will be in bad air coming of the hull. This another reason why other builders don't go past 5.5 mtr luff lengths.


Quote

2, 2x Carbo ratchamtics each side for the kite.


Yep, no doubt about it. Good mod !

Quote

3, Higher aspect plates (around 4.7 we think)


That is pretty tall !

Well, you will not be suffering any performance loss in stable medium winds that is for sure. Probably track like a Fox hound. But you'll probably be lifting them early on when the gusts come or the winds increase.


Quote

4, Higher aspect Jib



Good mod, there was some potential to be gained there.


Quote

5, Higher aspect Kite (did not have time to measure the luff or take pics).



Very good for singlehanded sailing. Alot of luff length and a flat kite should be really effective when singlehanding.

From you describtion it almost sounds like you have a spi luff that is taking from skiffs. These too have very rounded luffs. Often this means they are cut to sail really deep.

Wouter
Posted By: ejpoulsen

Re: New boat pics - image intensive (ish) - 11/22/06 01:04 AM

After having just looked at the boat yard of Stealths there in Datchet, I must say that JP has made several nice looking changes..
Posted By: scooby_simon

Re: New boat pics - image intensive (ish) - 11/22/06 07:50 PM

Quote
From you describtion it almost sounds like you have a spi luff that is taking from skiffs. These too have very rounded luffs. Often this means they are cut to sail really deep.


It may sound like it, but no, having had a think about this, I think the kite will go VERY flat when I want it to, but when I need it to, it will go very full.

More pictures below, sorry over exposed and I don't have time to photoshop them.

Front beam and Mast spanner - note the rain and sun. It was a very "odd" day

[Linked Image]

Rear bem and Rudder

[Linked Image]

Pic from the back, note the dropped firring on the bow.

[Linked Image]
Posted By: Wouter

Re: New boat pics - image intensive (ish) - 11/22/06 08:57 PM



Scooby,

You ARE going to bring that boat over to Zandvoort Global Challenge in 2007, right ?

Blade has been taking all the attention on mainland EU, it is time that Blade gets some serious competition and your boat is absolutely the right boat to do it with.

Besides I want to see it up close and personal !

Wouter
Posted By: scooby_simon

Re: New boat pics - image intensive (ish) - 11/22/06 09:20 PM

Quote


Scooby,

You ARE going to bring that boat over to Zandvoort Global Challenge in 2007, right ?

Blade has been taking all the attention on mainland EU, it is time that Blade gets some serious competition and your boat is absolutely the right boat to do it with.

Besides I want to see it up close and personal !

Wouter


I am hoping to.

I am 99% going to be at the Nationals as this is easier and cheaper to attend. Zandvoort is not certain, but I hope to.
Posted By: johnfullerton

Re: New boat pics - image intensive (ish) - 11/23/06 08:35 AM

Hi

I like the look of the carbon beams. <img src="http://www.catsailor.com/forums/images/graemlins/cool.gif" alt="" />

I see you got a footstrap on the back of each hull.

How are these attached to the hull ?

Bye
Posted By: john p

Re: New boat pics - image intensive (ish) - 11/23/06 08:39 AM

John

There are some acetal plates inside your hulls which you can drill and tap then bolt them on. Get in touch if you want me o supply some along with the location of the plates.
Posted By: scooby_simon

Re: New boat pics - image intensive (ish) - 11/24/06 10:51 PM

Quote
I also like the new dolphinstriker strap. Is that custom to you boat or will this also be fitted to all the new stealths. That strap will make the mainbeam very stiff under mast loads and the flatness of the strap will make it cut through waves effortlessly.


Wouter,

The strap dolphinstriker will only be available on the Carbon Beam option, the Alu beam Dolphin striker would not fit so John had to find another solution and this was it. This is also true for the removable self tacker.
Posted By: scooby_simon

Re: New boat pics - image intensive (ish) - 11/29/06 12:54 AM

Will have some more pitures later today as I am off to put it together as I "found" I had an extra days holiday I needed to take.
Posted By: Wouter

Re: New boat pics - image intensive (ish) - 11/29/06 05:56 AM



Cool !


Wouter
Posted By: Mark P

Re: New boat pics - image intensive (ish) - 11/29/06 10:04 AM

I'm very Impreza'd Scooby. Looks as if John has just raised the benchmark amongst the F16 manufactures. If it goes as good as it looks you could be the first human cannon ball in the F16 Circus. Good luck this weekend I hope the weather is favourable and you manage to wipe the smile of your face by Christmas. P.S don't be shy with the photo's.
Posted By: scooby_simon

Re: New boat pics - image intensive (ish) - 11/29/06 05:12 PM

Quote
I'm very Impreza'd Scooby.
LOL....

More boat pron <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />


Sorry, no sails up pics yet.

Did not get time, as you can see from these pics it is starting to get dark..

mast rotation comes up from under the tramp.

[Linked Image]

Then the tails are lead to the side decks thru a small block, then the a cleat

[Linked Image]

Tail then continues thru the deck tramp eyes - thinking here is that if I pull by the cleat, it somes out, but if I pull behind the fist eye, I pull more roatation out of the mast.

[Linked Image]

Having looked at the pics, I've set this up wrong as I need the rope to go one more ring back before going down as I will not be able to let off any rotation with the plates up.

Double Ratchamatics, Kite goes to aft one first.

[Linked Image]

Forestay bridal is about 7 cm from the top of the boat in the inside.

[Linked Image]

Mast up with Boom and spanner:

[img]http://www.letshaveachat.com/gallery/gallery2/d/148-1/130_3078.JPG[/img]

2:1 trapeze adjusters:

[img]http://www.letshaveachat.com/gallery/gallery2/d/151-1/130_3080.JPG[/img]

Not much clutter up front without the jib:

[img]http://www.letshaveachat.com/gallery/gallery2/d/154-1/130_3082.JPG[/img]
Posted By: Robi

Re: New boat pics - image intensive (ish) - 11/29/06 05:23 PM

hotness! Now we need some sails up, and some action photos and the collection will be complete.

Total SEXINESS!
Posted By: pdwarren

Re: New boat pics - image intensive (ish) - 11/29/06 10:03 PM

That's very cool Simon - looking forward to seeing it in the flesh. We should try and get a decent F16 turn-out on at least one of the winter warm-up weekends at Datchet (10th/11th Feb or 17th/18th Feb). Can we tempt you?

I'm impressed that you've got the control lines tidied and sorted before the boat's even hit the water. I've had the Blade 8 months and have only just sorted out the mast rotation - have made the line continuous, and so far it's working well...

I'll be interested in how the downhaul tidying works - how much elastic have you got under the tramp? In the past I've doubles the downhaul round a block so that 1" of elastic pulls 2" of rope.

Paul
Posted By: scooby_simon

Re: New boat pics - image intensive (ish) - 11/29/06 10:29 PM

Quote
That's very cool Simon - looking forward to seeing it in the flesh. We should try and get a decent F16 turn-out on at least one of the winter warm-up weekends at Datchet (10th/11th Feb or 17th/18th Feb). Can we tempt you?

I'm impressed that you've got the control lines tidied and sorted before the boat's even hit the water. I've had the Blade 8 months and have only just sorted out the mast rotation - have made the line continuous, and so far it's working well...

I'll be interested in how the downhaul tidying works - how much elastic have you got under the tramp? In the past I've doubles the downhaul round a block so that 1" of elastic pulls 2" of rope.

Paul


Maybe on the Feb races at Datchet - but it's filppin cold that time of year !

Not 100% sure lines are in the right places yet, might need longer DH rope as I have a 12:1 and also not sure the rotation is quite right - test it and see.

Still need to sort out how the Kite Up/down will flow and I have not tied off the Spi pole bridals yet as there was too much wind (and too little time) to put the kite up today. Also need to put the mainsail up and sort out battens. Hopeing for a chance to sail on Saturday.
Posted By: Berny

Re: New boat pics - image intensive (ish) - 11/30/06 06:47 AM

Where does that spanner line go after it goes back under the tramp?
Posted By: johnfullerton

Re: New boat pics - image intensive (ish) - 11/30/06 08:13 AM

Hi


The downhaul is a one rope system if I remember right.
I think you just got it pulled to much to one side.

I only had a couple of goes on mine before I put it away for the winter. <img src="http://www.catsailor.com/forums/images/graemlins/frown.gif" alt="" />

So I did these drawing of the ropes.
[img]https://sam.home.cern.ch/sam/sail/stealth/downhaul.bmp[/img]
[img]https://sam.home.cern.ch/sam/sail/stealth/kite1.bmp[/img]
[img]https://sam.home.cern.ch/sam/sail/stealth/kite2.bmp[/img]


Bye
Posted By: scooby_simon

Re: New boat pics - image intensive (ish) - 11/30/06 06:12 PM

Quote
Where does that spanner line go after it goes back under the tramp?


to the side where the block on the tramp eye is.
Posted By: scooby_simon

Re: New boat pics - image intensive (ish) - 12/02/06 07:40 PM

Mainsail up:

[Linked Image]

The daggerboard you can see is in so that the bottom of the plate is at the bottom of the hull to give some idea of the depth of the plates.

First sail today in about a F2-3.

Initial impressions are that the boat picks up very well in the gusts (it is considerably lighter than the 17), but the boat also feels very stiff. The boat tacks VERY quickly compared with the 17 (long thin plates must help alot) and I could only get one fully down today as they must be slightly different widths - must take some of the packing off the inside of one dagger slot.

Mainsail looks very good, twists off very well (in the small gusts today) and the kite looks very different when sailng to the 17 kite.

This kite is VERY easy to oversheet and so I'm going to need to be very carefull. Boat tracks well upwind, but I need to move the mast back a little (more rake) as there is not much feel.

Had a good sail around the lake on all points of sail and it all appears to work (telescopic tiller came apart at sone stage, so I need to talk to John to make sure it does not happen again !) Rigging has already streached a little !

Did some wiring with the kite up as well and now decided I need longer kite sheets.

The Ratchamatic mainsheet blocks are a very nice touch too.

Overall a good days first sail and givcen it was only F2-3 was quict pleased to see my GPS give a Max speed of 16.1kts and a few plots at around 17mph.

Just need to sort a few niggles out and get down to some serious sailing over the winter.

(Rolf, Spi pictures to come once I get a day when there is light enough wind to fly the kite.
Posted By: Mark P

Re: New boat pics - image intensive (ish) - 12/03/06 12:32 AM

Mast rake with the big square tops? I'm still experimenting; From my experienence you don't need alot if any. I know it's early days but did you FEEL the F16?
Posted By: scooby_simon

Re: New boat pics - image intensive (ish) - 12/03/06 09:41 AM

Quote
Mast rake with the big square tops? I'm still experimenting; From my experienence you don't need alot if any. I know it's early days but did you FEEL the F16?


I don't really know what to be aiming at for rake. Currently 4th hole from the top on the chain plates as a guess after rigging at John's a lot lower, John said "that looks like too much" so we guessed at 4. It's not enought as there is not much feel going upwind. Going to move down to 6th hole and see how that goes.

As far as feel goes, it feels good. Picks up well in the gusts, drives nicely with the kite up and all the systems (except one plate not fitting in the slot) all work well, boat points well even with only 1 1/2 plates down. Mast rotation feels simple and efficient. 12:1 DH works well (yet to sail when I was needing to pull on hard and then let all the way off, so we'll see if I go back to 8:1 or not). Mainsheet system is very good and the Ratchamatic is very nice, don't like the actaul rope so I'll be changing this today. Not sure I've got the Kite sheeting angle in the right place, but I'll let everything bed down before I start putting more holes in the boat. Not planning to sail today as I'm off swimming with my son (and it's blocking dogs off leads here as well).
Posted By: Wouter

You are an F16 sailor now, Welcome to the ... - 12/03/06 10:07 AM


You are truly an F16 sailor now, Simon, welcome to the club !

May the winds and boat smile on you each time you go out.

Best of enjoyment,

Wouter
Posted By: davidtugwell

Re: You are an F16 sailor now, Welcome to the ... - 12/03/06 10:33 AM

Simon, good to hear you are enjoying the Stealth. I am colleting my new one on boxing day so have been interested in your progress. Maybe we should try and organise an F16 fun sail just before the new year? Compare notes and riggind etc. Anyone up for a day at Datchet an about 30th December or therabouts?
Posted By: scooby_simon

Re: You are an F16 sailor now, Welcome to the ... - 12/03/06 05:12 PM

Quote
Simon, good to hear you are enjoying the Stealth. I am colleting my new one on boxing day so have been interested in your progress. Maybe we should try and organise an F16 fun sail just before the new year? Compare notes and riggind etc. Anyone up for a day at Datchet an about 30th December or therabouts?


Boxingday, that's a flippin long drive after Xmas lunch ! Hopefully the roads will be quiet. You going down and Back in the day ? I assume yours is No 554 ?

I assume you are not having Carbon Beams ?

Grafham Grand Prix. Saturday 30th Dec. First start 11.00 (I think).

That is where I'll be.

Did not get the mast rake done today, done some work on the plates and hopefully the one that did not fit now will.
Posted By: ejpoulsen

Re: New boat pics - image intensive (ish) - 12/03/06 09:14 PM

Why are the boards so long?
Posted By: Codblow

Re: New boat pics - image intensive (ish) - 12/04/06 09:57 AM

I imagine Scooby has balanced the extra efficiency against the schrs handicap hit * worthwhile, similarily with the longer luffed and more efficient jib he plans to use ,
though I assume when racing in F16 he will be in class rules and no penalty there . There's lenghty debate on
board ratios somewhere in this forum .



* I vaguely remebember when kicking formula about myself , you could get long boards if skinny enough for no relative penalty .

Though I assume he intends to race within F16 class this shouldn't be a concern.
Posted By: Wouter

Re: New boat pics - image intensive (ish) - 12/04/06 10:20 AM

Quote

I imagine Scooby has balanced the extra efficiency against the schrs handicap hit.



If he is smart then he would have done that. I remember him seeing that the aspect ratio is probably 5 and that is the way these boards look. But SCHRS handicap rating is not everything. There are downsides to using very long boards and I mean in the performance department. Such disadvantages may not be reflected in the calculated SCHRS number.

Wouter
Posted By: Dermot

Re: New boat pics - image intensive (ish) - 12/04/06 11:31 AM

Congratulations Simon !
Looking at the side on view of your Stealth, a question comes to mind: You have lowered the bridle fixing points on the hulls to accommodate the long luff jib, but the spinnaker pole seems quite high, will this be a problem when you get your jib kit ? Or does the pole just seem high because the cat is on its wheels.
Posted By: pdwarren

Re: New boat pics - image intensive (ish) - 12/04/06 12:15 PM

I was wondering the same thing. The pole does look a little higher than on the Blade: http://www.formula16.org/component/optio...ageViewsIndex=1

I can't really see how your pole is mounted to the bridles, but it looks pretty close to where the bridles meet, whereas on the Blade it's about a foot below that (with a compression strut to lower the tack of the jib).

I don't really know the pros and cons of pole height, but my instinct is that you want it as low as possible to reduce the heeling force for a given sail power.

Paul
Posted By: scooby_simon

Re: New boat pics - image intensive (ish) - 12/04/06 09:19 PM

Re the plates.

Yes They are longer than is normal, having sailed the inter 17 (which also has long plates) I decided that long plates were worth expirementing with - If at a later date I feel they are too long, I can always get the hack saw out. As for SCHRS, the rule currently only hits plates up to a certain aspect ratio. I agree that I'll need to be raising them when it's windy (and also light), but I'll live with that for now.

Quote
Looking at the side on view of your Stealth, a question comes to mind: You have lowered the bridle fixing points on the hulls to accommodate the long luff jib, but the spinnaker pole seems quite high, will this be a problem when you get your jib kit ? Or does the pole just seem high because the cat is on its wheels.


Bridal position is the standard for the 2006 boat.

Pole was just "thrown on" so I could go sailing, it will be dropping a fair bit more On Friday. not sure how-low-to-go, so I shall drop it so it's another 100mm lower and see how that is.
Posted By: Wouter

Re: New boat pics - image intensive (ish) - 12/04/06 09:32 PM



Pretty much the rule of thumb I use with respect to pole height is that the setup needs to be in the windshadow of the luff hull when that hull is just kissing the water. I "feel" that this is more efficient aerodynamically them having the snuffer setup stick out above the hull and thus increase surface area.

Apart from that a lower pole allows a longer luffed spi and that is always more efficient. But the pole should not be so low that its tip will hit the water when the bows dive down. I think on my boat this means that my spi pole tip is 450 mm above the horizontal line coming off the bows.

Wouter
Posted By: scooby_simon

Re: New boat pics - image intensive (ish) - 12/04/06 10:13 PM

Quote



Apart from that a lower pole allows a longer luffed spi and that is always more efficient. But the pole should not be so low that its tip will hit the water when the bows dive down. I think on my boat this means that my spi pole tip is 450 mm above the horizontal line coming off the bows.

Wouter


I asssume that is the tip of the pole Wouter ?
Posted By: GeoffS

Re: New boat pics - image intensive (ish) - 12/04/06 10:52 PM

Quote
...having sailed the inter 17 (which also has long plates)...


FYI: The Inter 17 plates got shorter. PC even provided a template for cutting existing boards. See attached figure.

http://www.nacraclass.com/northamerica/dagger_mod.jpg


Attached picture 92147-dagger_mod.jpg
Posted By: Mark P

Re: New boat pics - image intensive (ish) - 12/15/06 02:37 PM

Having scrutinised the photo's for an unhealthy amount of time , i) how have you run the kite downhaul ii) where have you attached the end of the snuffer iii) two rachet blocks for each kite sheet (you poof) wont this be annoying in light winds iv) what's your mainsheet purchase v) are there going to be any more photo's/sailing reports.
I will be checking the Grafham website over the Christmas period for your results!!( I can't bear to watch the Wizard of Oz again)
Posted By: scooby_simon

Re: New boat pics - image intensive (ish) - 12/15/06 08:09 PM

Quote
Having scrutinised the photo's for an unhealthy amount of time , i) how have you run the kite downhaul ii) where have you attached the end of the snuffer iii) two rachet blocks for each kite sheet (you poof) wont this be annoying in light winds iv) what's your mainsheet purchase v) are there going to be any more photo's/sailing reports.
I will be checking the Grafham website over the Christmas period for your results!!( I can't bear to watch the Wizard of Oz again)


i, Kite dowhaul. There is a missing eye on the front beam on the same side as the jib cleats. The whole thing runs on the tramp.

ii, end of the snuffler is tied to the Dolphin striker post

iii, they are both Ratchamtics so they are great for both light and heavy wind - but I have not tuned them yet.

iv, Currently 7:1, considering 8:1

v, Yes and yes. Up at the club tomorrow for a bit more fiddling (drop the pole lower among them) and then sailing - forcaset is only 11mph, I'd like some more.

As for results at the GGP, could be interesting as this will be my first race!
Posted By: Wouter

Re: New boat pics - image intensive (ish) - 12/16/06 09:33 AM



Good luck in the race, Simon !

Wouter
Posted By: scooby_simon

Re: New boat pics - image intensive (ish) - 12/16/06 04:52 PM

Sorry, no more pics today. Quick bit of sailing having dropped the pole and now we have liftoff.

Need more grip tape on the side of the boat !

Will take more pics on Wednesday !
Posted By: scooby_simon

Re: New boat pics - image intensive (ish) - 01/18/07 11:43 AM

Jib arrived yesterday and the luff length is 5960mm will be fitting it this weekend and will try and take some more pictures <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />
Posted By: Rolf_Nilsen

Re: New boat pics - image intensive (ish) - 01/18/07 11:47 AM

Pics, we are always eager for pics. "Fish eye" views especially..
Posted By: Dirk

Re: New boat pics - image intensive (ish) - 01/19/07 05:46 AM

Take care of your carbon mastrotation device...
It 'looks' like it is in some danger to get easily broken if your crew lean or step on it as it cannot rotate down from it fixed angle.

Yours look more solid than the what marstroem puts on his A-cat spars. Those I damaged several times, often just on land when the rotation line were pulled tight and you entered the tramp. the tramp moves down under weight and suddendly all your weight pulls on the rotator arm.
Posted By: scooby_simon

Re: New boat pics - image intensive (ish) - 01/19/07 10:11 AM

It's fairly solid, must be about 15mm thick !
Posted By: Dirk

Re: New boat pics - image intensive (ish) - 01/19/07 11:11 AM

just noticed on your pics that you anyhow have a line between the block and the rotator arm...

actually that gives you an interesting option:
find out what is the minimum rotation you want to ensure the mast can always rotate (probably when sailtrack pointing to rearbeam etc...). If you now make the line so long that the block touches the opening in the tramp and you have minimum rotation, you can always easily come to this (strong wind)position by just pulling the rotatorline in till the block hits the tramp. and you will never encounter the problem I talked about, that you pull the rotator tight and when someone moves on that tramp it pulls on the rotator arm...

just an idea...
Posted By: scooby_simon

Re: New boat pics - image intensive (ish) - 01/19/07 11:28 AM

Quote
just noticed on your pics that you anyhow have a line between the block and the rotator arm...

actually that gives you an interesting option:
find out what is the minimum rotation you want to ensure the mast can always rotate (probably when sailtrack pointing to rearbeam etc...). If you now make the line so long that the block touches the opening in the tramp and you have minimum rotation, you can always easily come to this (strong wind)position by just pulling the rotatorline in till the block hits the tramp. and you will never encounter the problem I talked about, that you pull the rotator tight and when someone moves on that tramp it pulls on the rotator arm...

just an idea...


I've already changed this. I have left this as it is, but have now also added another system on the plate so that I can play this from the wire as well. I now have a rough tune (the current system) and then a fine tune on the spanner plate. This now means I have a double ended system allowing a "fire-and forget" system for the transition between upwind and down wind. Will take a picture at the weekend as it is difficult to explan without.
Posted By: scooby_simon

Re: New boat pics - image intensive (ish) - 01/20/07 03:33 PM

Picture of the other part of the mast rotation control:

[Linked Image]

Blue rope tails go to the shrouds.

Attached picture 97295-rotation.jpg
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