Higher mounted/longer boom.

[Mychael]

Come next year I'll be completely renewing the standing rigging and mast on my boat, this will allow me the opportunity to make changes if they are feasible and practical.

It's always been an annoyance that my boom is set relatively low, too low for a tent and if you stand in the cockpit you risk getting a boom in the teeth.

To just mount it higher would mean loosing to much size in the main but could this be offset by getting a new boom that was longer as well as set higher?

I need a new main anyway so could have whatever I wanted made.

Thoughts?

Mychael

[rwatson]

Longer foot, lower sail means loss in sailing performance.

This sounds like a small boat as you are talking about boom tents, in which case maybe you just need to raise the base of the mast by a couple of feet.

You will need longer shrouds, but all the other fittings can stay the same

[Mychael]

Keel stepped mast.. Boat is 26ft. Just want a tent for when working on the boat for some sun shade and to keep some bird **** out of the cockpit.

Mychael

[Paul B]

Originally Posted by Mychael

Come next year I'll be completely renewing the standing rigging and mast on my boat, this will allow me the opportunity to make changes if they are feasible and practical.

It's always been an annoyance that my boom is set relatively low, too low for a tent and if you stand in the cockpit you risk getting a boom in the teeth.

To just mount it higher would mean loosing to much size in the main but could this be offset by getting a new boom that was longer as well as set higher?

I need a new main anyway so could have whatever I wanted made.

Thoughts?

Mychael

What is the Aspect Ratio of the main? Fractional or Masthead?

Most modern sloop rigs don't go to a lower aspect ration than about 2.4. If you can raise the boom the amount required and lengthen the boom the amount you like and retain this aspect ratio you should be OK.

[Mychael]

Originally Posted by Paul B

What is the Aspect Ratio of the main? Fractional or Masthead?

Most modern sloop rigs don't go to a lower aspect ration than about 2.4. If you can raise the boom the amount required and lengthen the boom the amount you like and retain this aspect ratio you should be OK.

Masthead rig. I'm afraid I don't actually know the aspect ratio, I'll try to find that out from the sailmaker. He has drawings of the original sailplan.

Mychael

[Omeron]

One of the biggest constraints usually is the backstay clearance, if you are not changing the mast and lengthening the boom. Unless ofcourse you have a backstayless rig, and or ready to give up some of the mainsail roach.

[Hansen Aerosprt]

AR => Span Squared / Area

Originally Posted by Mychael

Masthead rig. I'm afraid I don't actually know the aspect ratio, I'll try to find that out from the sailmaker. He has drawings of the original sailplan.

[Paul B]

Originally Posted by Hansen Aerosprt

AR => Span Squared / Area

I was referring to geometric AR (span/chord > 2.4), not aerodynamic aspect ratio.

[Mychael]

Originally Posted by Omeron

One of the biggest constraints usually is the backstay clearance, if you are not changing the mast and lengthening the boom. Unless ofcourse you have a backstayless rig, and or ready to give up some of the mainsail roach.

That's what I figured. We need to do some precise measurements to see how far we can go. Certainly would loose some roach.
Guess it really depends how much we can gain at the bottom with a longer boom.

Mychael

[diwebb]

Hi,
if the problem is just the clearance for the boom tent, why not just mount the gooseneck fitting on a short length of heavy track. Then you could raise it when the boom tent is in place and adjust it back again for sailing. You could also put in an upwards reef if there is sufficient clearance between the backstay and boom end. This would give added headroom clearance below the boom when required, yet still allow for the full sail area in lighter winds.

All the best with the project.
David