cynthia
Well-Known Member
Re: Suggestions please for lifting keel yacht with reasonable performa
Had a Parker 275 a few years ago. No complaints whatsoever.
Had a Parker 275 a few years ago. No complaints whatsoever.
Suggestions please for lifting keel yacht with reasonable performance
- Thread starter Zippysigma
- Start date
cookjwm
Well-Known Member
Re: Suggestions please for lifting keel yacht with reasonable performa
I looked at Parker -great boat but our boatyard man went a funny colour at the thought of a near 4ft wide wing catching under the mooring trots....so did I
I looked at Parker -great boat but our boatyard man went a funny colour at the thought of a near 4ft wide wing catching under the mooring trots....so did I
kengill
Well-Known Member
Gib'sea Master 96
Very comfy and slips in most places but has a 2m deep keel when needed.
Mine leaves the Nicks and contessas behind with its 21 year old sails.
Very comfy and slips in most places but has a 2m deep keel when needed.
Mine leaves the Nicks and contessas behind with its 21 year old sails.
jb2006
Well-Known Member
Re: Suggestions please for lifting keel yacht with reasonable performa
No offence intended - 8 - 8.5 kt close hauled seems a rather tall order for a 29 foot waterline (hull speed is about 7 kt) and that wing means a large wetted area ... or is it a foil as on the Moth /forums/images/graemlins/wink.gif
No offence intended - 8 - 8.5 kt close hauled seems a rather tall order for a 29 foot waterline (hull speed is about 7 kt) and that wing means a large wetted area ... or is it a foil as on the Moth /forums/images/graemlins/wink.gif
Bergman
Well-Known Member
Re: Suggestions please for lifting keel yacht with reasonable performa
The wing is an aerofoil, develops a positive righting moment as boat speed increases.
Remember the "hull speed" is a point on a curve. Applying more power will increase the speed above the 1.4 root L figure. Have a look at the mast on a Parker 31 - its as tall as many 36 footers. 530 sq ft of sail with No2 genoa and a weight of 7000lbs. There is no lack of power.
If you were to read Parker's original brochure it talks of 9kts boat speed in 20kts of wind.
Re-read the post - The dublin to holyhead trip I mentioned, 60+ miles in 9 hours
averaging 7kts or more. Clearly significant periods of such a trip we were topping 8 knts to make such an average. And I don't calibrate time!
I have no stake in this - I owned the Parker for almost 13 years and loved the boat. I only changed because of advancing years and declining health meant I needed something more restful and sheltered from the weather. If I could wind 13 years off my clock I'd have one tomorrow.
The wing is an aerofoil, develops a positive righting moment as boat speed increases.
Remember the "hull speed" is a point on a curve. Applying more power will increase the speed above the 1.4 root L figure. Have a look at the mast on a Parker 31 - its as tall as many 36 footers. 530 sq ft of sail with No2 genoa and a weight of 7000lbs. There is no lack of power.
If you were to read Parker's original brochure it talks of 9kts boat speed in 20kts of wind.
Re-read the post - The dublin to holyhead trip I mentioned, 60+ miles in 9 hours
averaging 7kts or more. Clearly significant periods of such a trip we were topping 8 knts to make such an average. And I don't calibrate time!
I have no stake in this - I owned the Parker for almost 13 years and loved the boat. I only changed because of advancing years and declining health meant I needed something more restful and sheltered from the weather. If I could wind 13 years off my clock I'd have one tomorrow.
Tarka1
Well-Known Member
Kelt 850 - excellent boat, only selling because growing family have demanded more room!
Kelt For Sale
Kelt For Sale
Zippysigma
Well-Known Member
Re: Suggestions please for lifting keel yacht with reasonable performa
You have my interest! but wow, 2nd hand Parkers are hard to find!
You have my interest! but wow, 2nd hand Parkers are hard to find!
gandy
Well-Known Member
Re: Suggestions please for lifting keel yacht with reasonable performa
How does that wing keel work? I can't see how it could exert a righting moment without being assymetrical - which clearly it can't be. Does it generate a lift force? But that would be pushing the boat downwind - compare with the foiling Moths who heel the boat to windward.
How does that wing keel work? I can't see how it could exert a righting moment without being assymetrical - which clearly it can't be. Does it generate a lift force? But that would be pushing the boat downwind - compare with the foiling Moths who heel the boat to windward.
Bergman
Well-Known Member
Re: Suggestions please for lifting keel yacht with reasonable performa
Easier to describe with pictures but I'll try:
Consider the boat heeled to Stbd.
The boat is making leeway so the flow of water over the wing is not directly along the chord of the wing but at an angle of incidence roughly equal to the degree of leeway to the chord. This is from the top of the wing and so generates "lift" in a direction downward from the wing.
This force is not vertically downward but is at the same angle as the angle of heel.
The force will have to vector components one horizontal - opposing leeway and a second vertically downward which since the centre of effort of the wing is offset by the heeling of the boat - provides a righting moment..
I think!
Hope that helps.
Easier to describe with pictures but I'll try:
Consider the boat heeled to Stbd.
The boat is making leeway so the flow of water over the wing is not directly along the chord of the wing but at an angle of incidence roughly equal to the degree of leeway to the chord. This is from the top of the wing and so generates "lift" in a direction downward from the wing.
This force is not vertically downward but is at the same angle as the angle of heel.
The force will have to vector components one horizontal - opposing leeway and a second vertically downward which since the centre of effort of the wing is offset by the heeling of the boat - provides a righting moment..
I think!
Hope that helps.