Asymmetrical Spinnaker on smaller Yamaha
- Thread starter jnovie
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The previous owner of my boat had a extension bolted to the bow- You had to bolt and unbolt it to keep the marina happy and it was a hassel. I replaced it with a fabricated mount attached to the bow that allows a small spinaker pole to slide through. The aft end of the pole clips onto a U bolt mounted through the deck. this made it retractable. I believe SELDEN sells a similar system. the trick is the fwd mount.
I later replaced it with a retractable system, tube inside tube, that can be controlled from the cockpit. Both systems are limited as to strength with no downhaul below the pole to the stem of the boat. My tube in tube version being the weaker of the two. I have to flag the sail to change tacks as the sprit is only 36" forward of the headstay. I'd consider it a light air system.
I'll post some picks next time I'm down at the boat--- stay tuned.
I later replaced it with a retractable system, tube inside tube, that can be controlled from the cockpit. Both systems are limited as to strength with no downhaul below the pole to the stem of the boat. My tube in tube version being the weaker of the two. I have to flag the sail to change tacks as the sprit is only 36" forward of the headstay. I'd consider it a light air system.
I'll post some picks next time I'm down at the boat--- stay tuned.
Found these photos deep in my hard-drive.
This was the first version I built. Simple and strongest of the two. This required forward crew to deal with sail tack ect. I used a block/line to allow the sail tack to come aft for stowing. nav light is still visible from each side even though it doesn't look it.
I'll post photos of cockpit retractable bowsprit later this week
This was the first version I built. Simple and strongest of the two. This required forward crew to deal with sail tack ect. I used a block/line to allow the sail tack to come aft for stowing. nav light is still visible from each side even though it doesn't look it.
I'll post photos of cockpit retractable bowsprit later this week
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Here are the pics of the retractable bowsprit. It keeps me off the bow. I retrieve the chute in a sail bin I mount above the sink. The black line extends the sprit. The blue line is the sail tack,and is also used to retract the sprit. The standard pole is stowed along side, the ring stops the pole from flopping around . the foredeck is rather busy.
As you can see the system is rather spindely and I only use it in light air.
I'm thinking it would fold if things got serious. As most of my racing days are behind me I hope to be wise and reduce sail area BEFORE it gets that serious.
In heavy air I'd opt for the earlier version spin pole system. All this was fabricated out of marine savage parts other than the Fwd mount that was all custom Fabrication. I'm sure if you purchased specific tubing the system would be much stronger.
So there ya go..... thats how I dealt with the issue.
As you can see the system is rather spindely and I only use it in light air.
I'm thinking it would fold if things got serious. As most of my racing days are behind me I hope to be wise and reduce sail area BEFORE it gets that serious.
In heavy air I'd opt for the earlier version spin pole system. All this was fabricated out of marine savage parts other than the Fwd mount that was all custom Fabrication. I'm sure if you purchased specific tubing the system would be much stronger.
So there ya go..... thats how I dealt with the issue.
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That was great of you to send images of both systems developed for your boat' sprit pole. Your most current system is particularly well thought out as it allows for control of extension and retraction of the pole from the cockpit. I will give everything you sent lots of thought and in the end will discuss with a spar maker and rigger on ideas of how to further refine the design. You have given me lots of "food for thought".
1. Do you have any thoughts on the practicality of using an A sail on our style (IOR) of boat?
2. Have you used the A sail reaching in other than fairly light air. If so how did the boat perform?
3. In the end I may decide on a carbon fiber tube fixed mount with a minimum extension. Approximately how much room do you need beyond the tip of the bow so that the easily clears the bowsprit without hanging up and also has adequate room to clear in front of the forestay. Looks like in your initial fixed system it was about two feet or so.
4. Who built the sail?
Once again, many thanks for sharing the design for your sprit pole system.
Jan
1. Do you have any thoughts on the practicality of using an A sail on our style (IOR) of boat?
2. Have you used the A sail reaching in other than fairly light air. If so how did the boat perform?
3. In the end I may decide on a carbon fiber tube fixed mount with a minimum extension. Approximately how much room do you need beyond the tip of the bow so that the easily clears the bowsprit without hanging up and also has adequate room to clear in front of the forestay. Looks like in your initial fixed system it was about two feet or so.
4. Who built the sail?
Once again, many thanks for sharing the design for your sprit pole system.
Jan
For me the Asymmetrical is the way to go due to the ease of handling it. I sail short handed or frequently singlehanded. My racing days are, for the most part, behind me so I don't push the envelope as you would racing.
From what I've read the IOR formula boats have a tendency to death roll under chute if not watched carefully. My racing background was in dingy's (Thistles) so those tendencies don't bother me much but for my crew it's not to comfortable. The A chute gives you a quick escape if things get spooky and keep the crew happy. A happy crew makes less mistakes therefore faster sailboats. I think developing the asymmetrical could work well.
My A-chute came with the boat. It was a "Air Force" set up with douser. I got rid of the douser as it made the take down way to slow for my liking. The chute is undersized (don't recollect the luff ) and the 135% genoa seemed to do as well in a breeze.
When the headsail needs a pole to keep it filled is when I bring out the chute. I'm looking into getting a larger asymetrical.
If I recollect the fixed bowsprit was 18 or 24". As I mentioned earlier I flagged (outside tacked) the sail as getting it through the narrow slot between forestay and chute tack was very difficult and slow. The retractable has 36" and works much better with practiced crew helping the lazy sheet behave while performing either inside or outside tacks.
I'd look at some of the modern rigs to see what configurations they use.
Remember my system came out of the junkyard and strength was dictated by what I found material wise. Having a Spar built will be the hot tip.
Glad I could help spark the flames of inovation.
Be sure to post pics if you develope a system for your boat.
Nuthin is better than messing with boats. Have fun!
syntonossailor
From what I've read the IOR formula boats have a tendency to death roll under chute if not watched carefully. My racing background was in dingy's (Thistles) so those tendencies don't bother me much but for my crew it's not to comfortable. The A chute gives you a quick escape if things get spooky and keep the crew happy. A happy crew makes less mistakes therefore faster sailboats. I think developing the asymmetrical could work well.
My A-chute came with the boat. It was a "Air Force" set up with douser. I got rid of the douser as it made the take down way to slow for my liking. The chute is undersized (don't recollect the luff ) and the 135% genoa seemed to do as well in a breeze.
When the headsail needs a pole to keep it filled is when I bring out the chute. I'm looking into getting a larger asymetrical.
If I recollect the fixed bowsprit was 18 or 24". As I mentioned earlier I flagged (outside tacked) the sail as getting it through the narrow slot between forestay and chute tack was very difficult and slow. The retractable has 36" and works much better with practiced crew helping the lazy sheet behave while performing either inside or outside tacks.
I'd look at some of the modern rigs to see what configurations they use.
Remember my system came out of the junkyard and strength was dictated by what I found material wise. Having a Spar built will be the hot tip.
Glad I could help spark the flames of inovation.
Be sure to post pics if you develope a system for your boat.
Nuthin is better than messing with boats. Have fun!
syntonossailor
HI there. I am using both symmetrical and asymmetrical (cruising) spinnakers on my 25MKII. I prefer symmetrical because he is faster, but if I have shorthanded crew I have no other choice than asymmetrical. The benefits of asymmetrical spinnaker is easy installation, I use sock for it. My asymmetrical sail area is 47 sq. meters, I've ordered it at fareastsailmakers.com.
And yes, you have to watch carefully. If you trying to get too much Upwind, you trying to get some "shocking fun".
I've never thought about poles for asymmetrical, because it is illegal for races.
And yes, you have to watch carefully. If you trying to get too much Upwind, you trying to get some "shocking fun".
I've never thought about poles for asymmetrical, because it is illegal for races.
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