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Author Topic: Everest 1 Cherub  (Read 73648 times)

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Offline Torchy

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Re: Everest 1 Cherub
« Reply #90 on: January 22, 2013, 05:08:58 PM »
Quote from: Clive Everest on January 22, 2013, 04:36:26 PM

I hid the buoyancy under the floor.

Clive

Yes, very unobtrusively  :)
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Offline MikeBz

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Re: Everest 1 Cherub
« Reply #91 on: January 22, 2013, 06:00:00 PM »
The noose, just in case it all goes wrong...
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Offline phil_kirk

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Re: Everest 1 Cherub
« Reply #92 on: January 22, 2013, 09:30:08 PM »
Ah there it is!

Coming together nicely.  I can't wait to see the finished boat. only 4.5 weeks to go.
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Offline Clive Everest

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Re: Everest 1 Cherub
« Reply #93 on: January 27, 2013, 07:11:56 PM »
Whilst the rest of you were getting sticky in Bristol I had a productive couple of days with Roger and Dan.
We weigh the bare hull at 28.5kg. This has given us the confidence we can stay in weight with a few luxuries such as gunwale to gunwale progrip, and add a bit more carbon around the gunwales.
We got the mast up and took some luff curve measurements.
Good progress but still a lot to do.

Clive
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Offline simon_jones

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Re: Everest 1 Cherub
« Reply #94 on: January 27, 2013, 07:31:09 PM »
She is looking beautiful Clive, can't wait to see her and you on the water. It's amazing to have so many new builds in progress each with different ideas.
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Offline phil_kirk

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Re: Everest 1 Cherub
« Reply #95 on: January 27, 2013, 09:34:27 PM »
Very good Clive.

Your heading towards a 40Kg boat in measurement trim.  Your should be considering cushions and a beer fridge!
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Offline daryl_wilkinson

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Re: Everest 1 Cherub
« Reply #96 on: January 27, 2013, 11:02:59 PM »
Now that is a great looking Cherub.
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Offline Torchy

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Re: Everest 1 Cherub
« Reply #97 on: January 28, 2013, 04:53:22 PM »
Just one thought about the jib track Clive. General opinion on the forum in the past has been that 3 points of support is not enough. If the crew flies into the track or into the jib during capsize etc will it break?
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Offline BenR

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Re: Everest 1 Cherub
« Reply #98 on: January 28, 2013, 05:05:51 PM »
Atum's has 3 points of contact and is pretty bom proof...excuse the pun.

We actually did a couple of races at the nationals with only two points of contact after a bolt came undone. :S






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Offline Clive Everest

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Re: Everest 1 Cherub
« Reply #99 on: January 28, 2013, 05:59:33 PM »
I suspect (hope) that it depends on what track you are using.
We are using an RS800 track, this has a deep section. From memory > 30mm.
It only has a 3 point contact on the RS800.
Do you have a link to previous discussions?
I think that RV has a 3 point contact as well.
Our boat has a very wide track. Bring on those 2 sail reaches in HISC pursuit races.
I will tell Alex not to fall on the jib.
It is currently attached with Hot melt. We will beef this up.
Clive
« Last Edit: January 28, 2013, 06:03:45 PM by Clive Everest »
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Offline Ben Howett

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Re: Everest 1 Cherub
« Reply #100 on: January 28, 2013, 06:51:19 PM »
Clive I like this a lot. The only thing I haven't been sure about is the foredeck flairs but seeing the self tacker track fitted (hot glued?) even they are started to make sense.

Cant wait to see it in action!
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Offline Phil Alderson

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Re: Everest 1 Cherub
« Reply #101 on: January 28, 2013, 09:17:09 PM »
Boat is looking very interesting. Is the rig setup with the main shrouds avoiding contact with the lower spreaders?
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Offline Clive Everest

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Re: Everest 1 Cherub
« Reply #102 on: January 28, 2013, 09:49:25 PM »
Hi Phil,
Yes, SK was set up that way. I feel that there always seems to be a complication with twin wire boats that if you are using the tension in the windward shroud to stop the centre of the mast coming to windward the tension decreases when you get on the wire, and the leeward spreader starts to push the mast the wrong way.
This can be mitigated by running huge rig tension which may be needed for jib luff control, but is not generally attractive.
Maybe we should be running spreaders that pull the shroud towards the mast.
The full width shroud base means that the rig is more like the rig on a cat where the shrouds hold the mast up without inducing huge compression and the diamonds hold it straight.
The spreader angles are relatively flat compared to some.
The mast has a carbon track and so is stiffer fore and aft.
I hope that the flat spreaders will mean that the topmast bends back during gusts and does not drop to leeward.
SK had lowers and inters The inters never seemed to do much but we used to run with a lot of lower tension so that the lower mast was inverted until you applied a lot of kicker. On the new boat we are just running high lowers to just above the gnav. Hopefully these will give enough support to the mid mast.
The mast was built on a 38mm mandrel with 430GPa carbon.
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Offline Torchy

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Re: Everest 1 Cherub
« Reply #103 on: January 28, 2013, 09:55:15 PM »
Quote from: Clive Everest on January 28, 2013, 05:59:33 PM
Do you have a link to previous discussions?

This thread: http://www.uk-cherub.org/forum/index.php/topic,1273.0.html

2 views - one supports your view based on RS and 'chunkiness' of track does matter.

"It may be worth bolting the track on. 1 at either end and 2 between them either side of the centre. The chunky I track on the e5's doesn't need much support because it is a large section.  If self tapping into carbon, fibre glass or epoxy i would always drill a pilot hole first so that only the thread of the screw has to cut through the material." Phil Kirk

"A track supported at the middle and ends does work as the normal high load is when the cark is at the end, the problem is if the car is in the middle and the sheet loads up e.g. in a capsize with crew landing in jib, then it will break. Your cats cradle idea may help with that, longer term I would put a foam-carbon strip from deck to track to give more support." Phil Alderson
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Offline Andrew Whapshott

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Re: Everest 1 Cherub
« Reply #104 on: January 28, 2013, 10:46:32 PM »
Clive, This is looking awesome..!!!!
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