Hello, How does one go about inducing a bit of forward bowing in the masthead rigged 1977 Oday 22’ without any forward lower shrouds or a baby stay… My mast pumps a wee bit and I don’t like it at all…the chain plates have so little aft run from the step that I am not wanting to tighten up the caps and outer to bow the mast…I was thinking of running a rope baby stay fixed to a deck pad eye to a block on the mast, down the mast, to a turn at the step and run aft so I can control from the cockpit…rather rope than wire for sail chaffing… What thoughts… Thanks in advance… Sean Herron.
- Status
- Not open for further replies.
J
Jerry Anderson
Mast pumping
If your mast pumps you are sailing wrong.. A pumping mast is what BREAKS the mast.. Lighten up or talk to your sail maker JDA
If your mast pumps you are sailing wrong.. A pumping mast is what BREAKS the mast.. Lighten up or talk to your sail maker JDA
S
Sean Herron
Frankensteiner...
Jerry, To clarify, this is not happening under sail, this is just an at dock set up, the inner and cap shrouds are inline with the mast step athwartships, there is no way to prebend the mast fwd slightly, and the only way to get some run aft on the shrouds is to rake the mast forward, honestly I think I have purchased a Frankensteined boat, it is looking more like a 22 with a swapped out 23 rig, I am looking forward to balancing the helm this season, thanks anyway... Another lesson learned concerning impulsive sailboat buying... Sean Herron.
Jerry, To clarify, this is not happening under sail, this is just an at dock set up, the inner and cap shrouds are inline with the mast step athwartships, there is no way to prebend the mast fwd slightly, and the only way to get some run aft on the shrouds is to rake the mast forward, honestly I think I have purchased a Frankensteined boat, it is looking more like a 22 with a swapped out 23 rig, I am looking forward to balancing the helm this season, thanks anyway... Another lesson learned concerning impulsive sailboat buying... Sean Herron.
C
Clay Wright
pumping
I'm not familiar with mast pumping. Do you mean the mast bows or sways fore and aft in the center when the boat is at the dock? I've never noticed anything like that on my '76 O22, and my rig is WAY out of tune. I do have a real helm balance problem, though. Terrible lee helm. Please let me know what pumping is, and I'll see if it sounds familiar on my 22. Clay Wright
I'm not familiar with mast pumping. Do you mean the mast bows or sways fore and aft in the center when the boat is at the dock? I've never noticed anything like that on my '76 O22, and my rig is WAY out of tune. I do have a real helm balance problem, though. Terrible lee helm. Please let me know what pumping is, and I'll see if it sounds familiar on my 22. Clay Wright
D
Don Evans
"Shiver Me Timbers" Cap'n Sean...
I have only read of the disturbance called "mast pumping", never experienced it myself, but here is a "physical" reason why it occurs: "The ""shivering"" of any rigid body is caused by vortices. This occurs when a fluid media (air / water) flows past a (typically) smooth and regular object. A vortex (think of this as a mini-tornado) is created on the down-wind (or water) side of the object. These vortices alternate in orientation which can set up vibrations in the object being passed. If these vibrations are significant enough in amplitude, they can not only be annoying, but destructive (fatigue, stress, etc.).The idea of changing the tension of the shrouds is a valid idea - this will change the shape of the object causing the vortices, and change the resonant frequency." I have read at Brion Toss's Spar Talk of hoisting a fender up the mast and tying the bottom off tight to disrupt the air flow around the mast. Raise and lower the fender until the pumping ceases. Don
I have only read of the disturbance called "mast pumping", never experienced it myself, but here is a "physical" reason why it occurs: "The ""shivering"" of any rigid body is caused by vortices. This occurs when a fluid media (air / water) flows past a (typically) smooth and regular object. A vortex (think of this as a mini-tornado) is created on the down-wind (or water) side of the object. These vortices alternate in orientation which can set up vibrations in the object being passed. If these vibrations are significant enough in amplitude, they can not only be annoying, but destructive (fatigue, stress, etc.).The idea of changing the tension of the shrouds is a valid idea - this will change the shape of the object causing the vortices, and change the resonant frequency." I have read at Brion Toss's Spar Talk of hoisting a fender up the mast and tying the bottom off tight to disrupt the air flow around the mast. Raise and lower the fender until the pumping ceases. Don
S
Sean Herron...
Oh Boy...
Hello, This is a static setup... This is almost getting funny, what I have is a masthead rig, because the cap shrouds are on a same line athwartships with the step, what I have is a column I can control only in that direction, so fore an aft you can wobble it a bit, if I had forward led lower shrouds I could prebend the mast forward, while static, to alleviate this... The drawings I have seen of a 22 show an aft led fractional rig, while the 23 has a masthead as does my 22, may have been on option for more sail area or cruising, I just don't know, should be fun.... Anyway never mind, I am going to rig up a baby stay, and be done... Sean Herron.
Hello, This is a static setup... This is almost getting funny, what I have is a masthead rig, because the cap shrouds are on a same line athwartships with the step, what I have is a column I can control only in that direction, so fore an aft you can wobble it a bit, if I had forward led lower shrouds I could prebend the mast forward, while static, to alleviate this... The drawings I have seen of a 22 show an aft led fractional rig, while the 23 has a masthead as does my 22, may have been on option for more sail area or cruising, I just don't know, should be fun.... Anyway never mind, I am going to rig up a baby stay, and be done... Sean Herron.
S
Sean Herron...
Tell you what...
Hello, I am sorry to have started this string really, I was just casting about...I won't induce mast bend thru a baby stay as this will put undue and undesigned stress on the tube section spreaders which are only taken to a pin on my spar (I re-made them to a tapped and threaded 5/16 S.S. bit with nylon compression washers at 6 degrees. to bisect the cap shroud)...aswell as interfere with the headsail thru a tack...I will swag up two more inner shrouds and take them fore and aft to pad eyes thru the deck and head liner (you can now argue 420 or 5200 for this application)...giving me fore and aft control of the mid spar...from a couple of S.S. links to the existing singular tang...I know I may sound a bit paranoid, but it gives me the control and stiffness I want for where I intend to be... Thanks for your input regardless... Rig as it is just does not make sense to me, I have seen another 22 with same so I assume it to be an option... I cannot see Raymond Hunt designing a rig like this so perhaps it is to be put 'down' to the builder... Who knows... Again, thanks again... I think I am becoming one of those rigging weirdos, it is the machinist in me... I miss my little dinghy... Sean Herron.
Hello, I am sorry to have started this string really, I was just casting about...I won't induce mast bend thru a baby stay as this will put undue and undesigned stress on the tube section spreaders which are only taken to a pin on my spar (I re-made them to a tapped and threaded 5/16 S.S. bit with nylon compression washers at 6 degrees. to bisect the cap shroud)...aswell as interfere with the headsail thru a tack...I will swag up two more inner shrouds and take them fore and aft to pad eyes thru the deck and head liner (you can now argue 420 or 5200 for this application)...giving me fore and aft control of the mid spar...from a couple of S.S. links to the existing singular tang...I know I may sound a bit paranoid, but it gives me the control and stiffness I want for where I intend to be... Thanks for your input regardless... Rig as it is just does not make sense to me, I have seen another 22 with same so I assume it to be an option... I cannot see Raymond Hunt designing a rig like this so perhaps it is to be put 'down' to the builder... Who knows... Again, thanks again... I think I am becoming one of those rigging weirdos, it is the machinist in me... I miss my little dinghy... Sean Herron.
H
Harry
O22 Masthead Rig
For the record, the drawings I have seen of the O22 show a fractional rig, which is how the later versions were produced ('78? and later). Earlier models, including my '74, were factory produced with the masthead rig... I think that's the same for your '77.
For the record, the drawings I have seen of the O22 show a fractional rig, which is how the later versions were produced ('78? and later). Earlier models, including my '74, were factory produced with the masthead rig... I think that's the same for your '77.
- Status
- Not open for further replies.