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Cirrus View Drop Down
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Posts: 590 		Post Options Post Options   Quote Cirrus Quote  Post ReplyReply Direct Link To This Post Topic: Not seen at the show
    Posted: 07 Mar 18 at 10:27am
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RS400atC View Drop Down
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Posts: 3011 		Post Options Post Options   Quote RS400atC Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 18 at 10:31am
Originally posted by mozzy

Originally posted by PeterG

Regarding the alloy boom: In a SMOD I see no reason to go carbon. Unlike a mast you can make it plenty stiff by increasing diameter.  It doesn't need variable bend characteristics over it's length, so why waste money on making it out of carbon? 

It hurts less when you get your head in the way!

Really? A heavier boom may carry more momentum, but a lighter boom will accelerate to faster speed. The total amount of energy in the impact will be the same, and that comes from the sail. 

A alloy boom can be pretty light, even compared to a carbon one once you extend out the diameter. Extending out the diameter will also make it a significantly more blunt object, which I would think would have more effect on the damage should it hit you on your head. 

I note the more developed prototype seems to have a nice carbon boom and GNAV. Makes sense to me.
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jeffers View Drop Down
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Posts: 3048 		Post Options Post Options   Quote jeffers Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 18 at 10:32am
Originally posted by mozzy

Originally posted by PeterG

Regarding the alloy boom: In a SMOD I see no reason to go carbon. Unlike a mast you can make it plenty stiff by increasing diameter.  It doesn't need variable bend characteristics over it's length, so why waste money on making it out of carbon? 

It hurts less when you get your head in the way!

Really? A heavier boom may carry more momentum, but a lighter boom will accelerate to faster speed. The total amount of energy in the impact will be the same, and that comes from the sail. 

A alloy boom can be pretty light, even compared to a carbon one once you extend out the diameter. Extending out the diameter will also make it a significantly more blunt object, which I would think would have more effect on the damage should it hit you on your head. 

Having been smacked square in the face by both types of boom I can assure you a carbon boom doesnt hurt anywhere near as much as an ali boom. I barely felt the carbon boom, the ali boom gave me concussion for 3 days.
Paul
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D-Zero GBR 74
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RS400atC View Drop Down
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Posts: 3011 		Post Options Post Options   Quote RS400atC Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 18 at 10:34am
What stops the moving pole munching the kite into the tube?
When your kite is as old as mine, it sticks to things.....
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 18 at 10:38am
Originally posted by jeffers

Having been smacked square in the face by both types of boom I can assure you a carbon boom doesnt hurt anywhere near as much as an ali boom. I barely felt the carbon boom, the ali boom gave me concussion for 3 days.

I'll defer to your great knowledge of being smacked in the face by a boom!  LOL
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H2 View Drop Down
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Posts: 750 		Post Options Post Options   Quote H2 Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 18 at 10:39am
Having been whacked in the head by both metal and carbon booms - alot - I know which one I prefer and it aint metal
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 18 at 10:48am
Originally posted by H2

Having been whacked in the head by both metal and carbon booms - alot - I know which one I prefer and it aint metal

LOL bloody hell you lot! Is being hit in the head really a genuine issue when choosing materials for boom?!

You need helmets. Or padded booms! 
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Cirrus View Drop Down
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Posts: 590 		Post Options Post Options   Quote Cirrus Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 18 at 10:55am
Don't get too excited by the alloy boom ... production boats would almost certainly have a carbon one as default.  The test being run was actually to compare/contrast the boat with a GNAV first and then conventional kicker - they don't run on the same booms of course and we just had a spare alloy tube lying around for the 'conventional' testing.  Both work fine.  Both could also be an option but I suspect the overseas market involved will simply opt for a standard GNAV - I'd prefer conventional myself, there is plenty of room for the crew work anyway, it does not disturb the mainsail setting as much, is less complex, lighter and of course cheaper.

BTW Jim has identified some of the features and considerations rather accurately.  The spinnaker is cut with a high clew to aid visibility - hence the first block each side being further back than otherwise ...  The pole also exits at an upward angle off the bow for the same reason (and if you look carefully you will see it largely sits in a recessed guiding channel under the foredeck to get a decent angle).  The deck mounted jib cleats are there to keep them out of the way really (off the floor) although in a production version they will be partially recessed in the edge of the deck - not mounted on the surface as in the photos.

The 'white’ sails (main/jib) are smaller than their Icon equivalents as this boat carries that 3rd sail - and the boom is higher on the mast which is itself slightly shorter.  The concept is to maintain an easy to manage boat that gets its pace from a very low resistance hull and relative lightness and that can be used across the wind range.  It points impressively high and the helm balance is great already so the basics are right for sure .. but we are still working on all the important details that remain.    The spinnaker in particular will get a lot of attention very soon so when we do screw it up, as we will, at Burghfield in the next few months expect to see a few photos of the bright yellow thing here.   We will also be asking a few outside the project to give it a go ... you don’t want to end up believing too much of your own propaganda in this game.

 What stops the moving pole munching the kite into the tube? 
The spinnaker is stored/gathered within a generous sock - the pole is underneath the sock and is anyway channeled in a  recess.



Edited by Cirrus - 07 Mar 18 at 11:01am
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RS400atC View Drop Down
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Posts: 3011 		Post Options Post Options   Quote RS400atC Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 18 at 11:07am
My question about the jib fairlead positions was really curiosity about whether it makes it hard to get the vertical sheet angle right? Do you just deal with that by moving the tack up/down?
I quite like the idea of the cleats being in front of the crew rather than astern as per the 400.

Bit curious about the big lump of shiny at the back of the chute?
Surely that could be lighter and cheaper in GRP?
Or do we need a bit of chrome for some markets?  :-)
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jeffers View Drop Down
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Posts: 3048 		Post Options Post Options   Quote jeffers Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 18 at 11:08am
Originally posted by mozzy

Originally posted by H2

Having been whacked in the head by both metal and carbon booms - alot - I know which one I prefer and it aint metal

LOL bloody hell you lot! Is being hit in the head really a genuine issue when choosing materials for boom?!

You need helmets. Or padded booms! 

Neither IMO

both were unexpected gybes so the boom came across very quickly (one was running by the lee in a Laser).
Paul
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D-Zero GBR 74
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