VandKoala
Active Member
Would it be a good idea to attach a Gennaker on a sturdy anchor roller that has been welded onto the bow with a (welded) support tube from the bottom?
Anchor roller as a Gennaker mounting point?
- Thread starter VandKoala
- Start date
garymalmgren
Well-Known Member
Yes . that will work.
Halo
Well-Known Member
My anchor roller is on a stainless assembly which has a hole drilled in the side of the “trough “ in which the chain runs out. I have a quick release sail coupling attached through this hole and use it to secure the foot of my cruising chute. The coupling is kept out of the way of the anchor and chain by the spinnaker halyard.
I use a 1m length of rope at the foot of the spinnaker to keep its foot above the pulpit.
I will be at the boat next week and can send a picture if you want
I use a 1m length of rope at the foot of the spinnaker to keep its foot above the pulpit.
I will be at the boat next week and can send a picture if you want
VandKoala
Active Member
I would appreciate the picture, thanks a lot!
Chiara’s slave
Well-Known Member
That is easily strong enough. Ours is on the end of a 45mm carbon pole with a bobstay to the U bolt on the stem, and side stays to the ama tips. It’s 80sq m, I daresay your anchor fitting is stronger than that.
VandKoala
Active Member
Cheers. It looks really strong. I tried kicking/pushing and jumping on it in different ways and it is not moving at all. I will try it out on our next crossing.
Neeves
Well-Known Member
It all looks over engineered to me,
Why not use the existing structure as the support for a dedicated prodder for a gennaker, but retaining the existing bow roller for, dedicated, anchoring.
If you want ideas how to make better use of what you have - establish a new thread (that's what PBO is for).
Jonathan
Why not use the existing structure as the support for a dedicated prodder for a gennaker, but retaining the existing bow roller for, dedicated, anchoring.
If you want ideas how to make better use of what you have - establish a new thread (that's what PBO is for).
Jonathan
VandKoala
Active Member
But it is - an existing structure, the bow roller is retained like this to support a 25kg Rocna Vulcan without hitting the hull. And it is a new thread asking if this could also work as a gennaker attachment point
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Refueler
Well-Known Member
A Gennaker can exert a lot of vertical stress on a fitting and I like to see a vertical tang or internal brace to counter it.
I look at the photo and - yes its definitely grossly overengineered - BUT for anchoring. Any load UP will be using the lengthy of the fitting as a lever multiplier.
Therefore my question is : Apart from the external pipe and the welding to the stemhead plate. What vertical form is there to counter the load the Gennaker will put on it internally ?
To be honest - I would be looking to use the forestay point instead as that should have internal stiffening to counter vertical loads.
I look at the photo and - yes its definitely grossly overengineered - BUT for anchoring. Any load UP will be using the lengthy of the fitting as a lever multiplier.
Therefore my question is : Apart from the external pipe and the welding to the stemhead plate. What vertical form is there to counter the load the Gennaker will put on it internally ?
To be honest - I would be looking to use the forestay point instead as that should have internal stiffening to counter vertical loads.
VandKoala
Active Member
There are stainless steel backing plates for both the plates on the top and the angled-plate that the pipe is welded to.
Forestay point is definitely stronger as it has a vertical thick SS “chainplate” going through the deck and attached through the lower hull part as well. And the hull is at least 8cm thick fiberglass at that point. I will check for vertical “pull”, thanks.
Chiara’s slave
Well-Known Member
You could add a wire with a turnbuckle down to the u bolt if in doubt.
Refueler
Well-Known Member
My point about vertical ... is based on years of checking out boats in UK and other locations.
For years - boats had tangs down the stem to take the vertical loads while wide deck plates spread the transverse and longitudinal. Then it seemed like designers moved away from the tangs and relied on the wide deck plates and an overalapping turn edge round the deck to hull joint. It was not uncommon to find evidence of lift or compression of backing plates under deck.
I would then advise client to look at having a vertical tang added.
For years - boats had tangs down the stem to take the vertical loads while wide deck plates spread the transverse and longitudinal. Then it seemed like designers moved away from the tangs and relied on the wide deck plates and an overalapping turn edge round the deck to hull joint. It was not uncommon to find evidence of lift or compression of backing plates under deck.
I would then advise client to look at having a vertical tang added.
