9/30/2015
9/23/2015
Jib booms, radial jib fittings and vangs
The mainsail and jib on the Star 45 are self tending. That is they can swing from side to side as the model tacks without requiring the sheets to be tended.
Originally on the old model the jib was loose footed and did not use a jib boom (aka a jib club). The addition of a jib club allowed the jib shape to be controlled.
Like the main sail the foot of the jib will fly up is some type of vang is not in place. Typically a swivel is placed along the forward end of the jib boom and clipped to a deck fitting (aka jib rack).
Look at the jib as a triangle. The halyard pulling the head of the jib places a force on the jib swivel. As the swivel is moved forward and aft along the jib boom the leach of the sail has more or less ability to rise. The head of the jib also moves off center.
It is possible to find jib boom fittings that anchor the forward end of the jib to the bow and use a vang to control the lift of the boom. These are known as radial jib fittings. The jib stay attaches to the radial fitting. This has the advantage of staying taught against the back stay as the sails are trimmed,
The jib boom and swivel also pull against the back stay. Since the jib stay attached to the jib boom in this arrangement moves off center and is subject to varying wind forces the tension on the jib stay and back stay will vary.
The driving force of the sails is changed when the slot between the mast and jib changes. Finding the best spot for the mast and jib swivel/radial fitting adds the challange of setting up the sails prior to sailing.
Originally on the old model the jib was loose footed and did not use a jib boom (aka a jib club). The addition of a jib club allowed the jib shape to be controlled.
Like the main sail the foot of the jib will fly up is some type of vang is not in place. Typically a swivel is placed along the forward end of the jib boom and clipped to a deck fitting (aka jib rack).
Look at the jib as a triangle. The halyard pulling the head of the jib places a force on the jib swivel. As the swivel is moved forward and aft along the jib boom the leach of the sail has more or less ability to rise. The head of the jib also moves off center.
It is possible to find jib boom fittings that anchor the forward end of the jib to the bow and use a vang to control the lift of the boom. These are known as radial jib fittings. The jib stay attaches to the radial fitting. This has the advantage of staying taught against the back stay as the sails are trimmed,
The jib boom and swivel also pull against the back stay. Since the jib stay attached to the jib boom in this arrangement moves off center and is subject to varying wind forces the tension on the jib stay and back stay will vary.
The driving force of the sails is changed when the slot between the mast and jib changes. Finding the best spot for the mast and jib swivel/radial fitting adds the challange of setting up the sails prior to sailing.
9/21/2015
Jib Tweaker photo Dave Ramos, Chesapeake Performance Models
From: David Ramos
To: Star45@yahoogroups.com
Sent: Fri, 14 Nov 2008 10:23 am
The following photos show my set up for a drum servo and jib tweaker.
Main sheet is 2:1 and jib sheet is 1:1
There is also a main sheet limiter that allows the jib to be eased past 90 degrees
Attached is the sheeting diagram as well.
Hope this helps
David Ramos
Chesapeake Performance Models
227 Main Street
Stevensville, MD 21666
david@rcyachts.com
www.rcyachts.com
To: Star45@yahoogroups.com
Sent: Fri, 14 Nov 2008 10:23 am
The following photos show my set up for a drum servo and jib tweaker.
Main sheet is 2:1 and jib sheet is 1:1
There is also a main sheet limiter that allows the jib to be eased past 90 degrees
Attached is the sheeting diagram as well.
Hope this helps
David Ramos
Chesapeake Performance Models
227 Main Street
Stevensville, MD 21666
david@rcyachts.com
www.rcyachts.com
Jib Tweaker VS Jib Twitcher
The Star 45 R/C Model Sail Boat - Builders Journal
A Jib Tweaker adjusts the length of the jib sheet.
A Jib Twitcher pulls the job boom wing on wing while sailing down wind
Jib Twitcher:
A Jib Tweaker adjusts the length of the jib sheet.
A Jib Twitcher pulls the job boom wing on wing while sailing down wind
Drum Servo with Jib Tweaker from Dave Ramos To: Star45@yahoogroups.com
Sent: Fri, 14 Nov 2008 10:23 am
The following photos show my set up for a drum servo and jib tweaker.From Dave M.
Hope this helps David Ramos, Chesapeake Performance Models
227 Main Street, Stevensville, MD 21666
email: david@rcyachts.com
www.rcyachts.com
Jib Twitcher:
9/16/2015
Drum Servo with Jib Tweaker from Dave Ramos
From: David Ramos To: Star45@yahoogroups.com
Sent: Fri, 14 Nov 2008 10:23 am
The following photos show my set up for a drum servo and jib tweaker.
http://www.rcyachts.com/STAR45/P1010084.JPG
http://www.rcyachts.com/STAR45/P1010082.JPG
Main sheet is 2:1 and jib sheet is 1:1
Hope this helps
David Ramos
Chesapeake Performance Models
227 Main Street
Stevensville, MD 21666
david@rcyachts.com
www.rcyachts.com
Sent: Fri, 14 Nov 2008 10:23 am
The following photos show my set up for a drum servo and jib tweaker.
http://www.rcyachts.com/STAR45/P1010084.JPG
http://www.rcyachts.com/STAR45/P1010082.JPG
Main sheet is 2:1 and jib sheet is 1:1
Hope this helps
David Ramos
Chesapeake Performance Models
227 Main Street
Stevensville, MD 21666
david@rcyachts.com
www.rcyachts.com
Subscribe to:
Posts (Atom)