Search found 503 matches
- September 26th, 2016, 9:43 am
- Forum: Technical Forum
- Topic: Lowest Aerodynamic Drag Foredeck/Hull Shapes
- Replies: 6
- Views: 8144
Re: Lowest Aerodynamic Drag Foredeck/Hull Shapes
Drew, The most commonly used sales point for selling sailboats is the "RACER CRUISER". My point is that the 27 and 30 can do both jobs very well. The 27 and 30 are excellent Racer Cruisers. You don't have to fill the tramps up with people every time you go out, just take one or two couples...
- September 20th, 2016, 10:48 am
- Forum: Technical Forum
- Topic: Lowest Aerodynamic Drag Foredeck/Hull Shapes
- Replies: 6
- Views: 8144
Re: Lowest Aerodynamic Drag Foredeck/Hull Shapes
Hi TP', Thanks for your comments. The 27 and 30 are totally different boats from the 15 thru 22. They are aimed at a totally different market. These two boats have two large tramps; lots of room. Therefore they can carry several people at one time. These two boats are excellent day sailing boats. Th...
- September 19th, 2016, 8:11 pm
- Forum: Technical Forum
- Topic: Lowest Aerodynamic Drag Foredeck/Hull Shapes
- Replies: 6
- Views: 8144
Re: Lowest Aerodynamic Drag Foredeck/Hull Shapes
HEY, WHAT'S UP? Where are the comments? Here's what I have heard from A cat World Class Sailors. They see no difference in speed sailing to windward. Downwind the boat is much harder to sail----- prevent/avoid pitchpole. Aerodynamics: Suppose we had a shape of 1 cubic foot, 1 ft by 1 ft by 1 ft with...
- September 17th, 2016, 8:49 pm
- Forum: Technical Forum
- Topic: Lowest Aerodynamic Drag Foredeck/Hull Shapes
- Replies: 6
- Views: 8144
Lowest Aerodynamic Drag Foredeck/Hull Shapes
Foredeck shapes? Has anybody seen any test results, real data, numbers, that show or prove there is a boat speed advantage associated with downward sloping foredecks. I've heard talk that there is less aerodynamic drag. Most of these deck downward sloping foredecks that I have seen have an outstandi...
- September 11th, 2016, 3:21 pm
- Forum: General Discussion
- Topic: Looking for help on a telescoping trailer
- Replies: 7
- Views: 8904
Re: Looking for help on a telescoping trailer
Drew, These pictures are of someones home spun idea of how to build a telescoping trailer. This is all junk. The rollers have to be steel or aluminum. The inner, moving beam, must be moving on rollers at all times. At the outlet of the fixed half of the telescoping system there must be a roller abov...
- September 6th, 2016, 9:35 pm
- Forum: General Discussion
- Topic: Looking for help on a telescoping trailer
- Replies: 7
- Views: 8904
Re: Looking for help on a telescoping trailer
Here we go again. `1978 factor telescoping trailer. Cost then was $2500, cost today $5000. Telescoping in or out was controlled by a continuous cable thru both beams. Movement out and in was always in concert, never jammed. Set up time was 15 minutes from 8 ft wide to 12 ft wide with tight tramp. Co...
- September 5th, 2016, 1:46 pm
- Forum: General Discussion
- Topic: the golfball effect
- Replies: 2
- Views: 5113
Re: the golfball effect
The golf ball moving through the air presents a unique problem. The ball is going 100 mph plus and the curvature around the ball is quick. The air cannot stay attacked to this short radius object at the speeds it normally travels. The dimples are on a golf ball to keep the airflow attached to the ba...
- September 3rd, 2016, 8:40 am
- Forum: General Discussion
- Topic: Dagger boards versus shared lift
- Replies: 35
- Views: 33133
Re: Dagger boards versus shared lift
Glad to help, Drew. You are right, shared lift is just another way to balance the CE and the CLR. The equation of max hull speed equals 1.4 times the square root of the LWL applies to keel boats and power boats. It does not apply to high fineness ratio hulls like beach cats. Power boats overcome thi...
- September 2nd, 2016, 8:39 pm
- Forum: General Discussion
- Topic: Dagger boards versus shared lift
- Replies: 35
- Views: 33133
Re: Dagger boards versus shared lift
Drew, The top speed limit on beach cats is pitchpole. Here's the situation, The forward sail thrust acts at the sail center of effort about 10 to 15 ft above the water depending on the size of the rig. The hull drag occurs about 6 ins below the surface of the water. The forward sail thrust and the h...
- September 1st, 2016, 6:48 am
- Forum: General Discussion
- Topic: Dagger boards versus shared lift
- Replies: 35
- Views: 33133
Re: Dagger boards versus shared lift
Drew, I don't mind if you change the design, just change it for the better.
- August 31st, 2016, 12:55 pm
- Forum: General Discussion
- Topic: Dagger boards versus shared lift
- Replies: 35
- Views: 33133
Re: Dagger boards versus shared lift
Drew, If you had taken a course in school on basic aerodynamics, you would understand all of this. The part of the centerboard drag that you are missing is the induced drag, the drag due to making lift part. The total CB drag equals the parasitic drag plus the induced drag. The parasitic drag, frict...
- August 29th, 2016, 8:20 pm
- Forum: General Discussion
- Topic: Jib Barber Hauler system SC 20
- Replies: 11
- Views: 10789
Re: Jib Barber Hauler system SC 20
Dan, the SC20 jib sheeting system is superior to the self tacker with no spinnaker. The barber hauler system will let you trim the sail for sailing close haul perfectly and it will let you trim the sail perfectly for sailing off the wind adjusting the barber hauler out. The self tacker, straight tra...
- August 29th, 2016, 7:15 pm
- Forum: General Discussion
- Topic: New Sails - Help, Tom!!??
- Replies: 10
- Views: 9736
Re: New Sails - Help, Tom!!??
Dan, colored sailcloth is fine. It does not have the strength of white cloth. The max strength of sailcloth is not tested until you are sailing in strong winds and max righting moment. The sailcloth is not going to tear. It is going to stretch with many repeated uses in heavy air. The leech will str...
- August 29th, 2016, 5:47 pm
- Forum: General Discussion
- Topic: Generic Sails
- Replies: 4
- Views: 6372
Re: Generic Sails
Dan, You have equal fractions of the jib sheet tension in the foot and leech of the sail when a line extension, a straight edge, of the slope of the jib sheets as they approach the sail are extended onto the sail and this line on the sail bisects the clew angle. Then 50% of the jib sheet tension goe...
- August 28th, 2016, 11:23 am
- Forum: Technical Forum
- Topic: Square Top vs Pin Head
- Replies: 25
- Views: 25566
Re: Square Top vs Pin Head
gahamby, good to hear from you. The knuckle at the bow is the intersection of the stem and the keel. So you have it right. Keep those blue stripes at the bow just underwater on all points of sail and in any wind condition and you will have the hull trim just right. In light winds, you will be sittin...