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#1
posted to rec.boats
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dead rise?
What does dead rise mean?
My boat has a 19 degree dead rise. |
#2
posted to rec.boats
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dead rise?
It's the inclusive angle of the hull at the transom, from keel to chine.
JR Bryan wrote: What does dead rise mean? My boat has a 19 degree dead rise. -- -------------------------------------------------------------- Home Page: http://www.seanet.com/~jasonrnorth |
#3
posted to rec.boats
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dead rise?
"JR North" wrote in message ... It's the inclusive angle of the hull at the transom, from keel to chine. JR Bryan wrote: What does dead rise mean? My boat has a 19 degree dead rise. -- -------------------------------------------------------------- Home Page: http://www.seanet.com/~jasonrnorth Thanks, but that didn't help. Want to try a simpler or more illustrative explanation? |
#4
posted to rec.boats
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dead rise?
Bryan wrote: "JR North" wrote in message ... It's the inclusive angle of the hull at the transom, from keel to chine. JR Bryan wrote: What does dead rise mean? My boat has a 19 degree dead rise. -- -------------------------------------------------------------- Home Page: http://www.seanet.com/~jasonrnorth Thanks, but that didn't help. Want to try a simpler or more illustrative explanation? If your boat were a log raft or a sheet of plywood, it would have zero deadrise. The perfectly flat bottom would not rise up above a horizonal line drawn below the boat. The chines (edges of the bottom, sort of) would rest on that horizontal line just like the keel. As the bottom assumes a "V" shape, an angle is formed between the point where the keel meets that horizontal line and the chines. If there were almost no angle at all, you might have a 5-degree deadrise. As the angle gets more pronounced, so does the number of degrees "deadrise" increase. Essentially you're measuring how steep or shallow the "V" is under the hull. Because this measurement will vary along the length of the boat, it is customarily taken at the transom, or stern. Boats with more deadrise tend to handle rough water better. Boats with flatter bottoms will plane more quickly, but will pound and slam more easily in a seaway and are less desirable when conditions are a bit grumpy. |
#5
posted to rec.boats
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dead rise?
Nice work!
wrote in message oups.com... Bryan wrote: "JR North" wrote in message ... It's the inclusive angle of the hull at the transom, from keel to chine. JR Bryan wrote: What does dead rise mean? My boat has a 19 degree dead rise. -- -------------------------------------------------------------- Home Page: http://www.seanet.com/~jasonrnorth Thanks, but that didn't help. Want to try a simpler or more illustrative explanation? If your boat were a log raft or a sheet of plywood, it would have zero deadrise. The perfectly flat bottom would not rise up above a horizonal line drawn below the boat. The chines (edges of the bottom, sort of) would rest on that horizontal line just like the keel. As the bottom assumes a "V" shape, an angle is formed between the point where the keel meets that horizontal line and the chines. If there were almost no angle at all, you might have a 5-degree deadrise. As the angle gets more pronounced, so does the number of degrees "deadrise" increase. Essentially you're measuring how steep or shallow the "V" is under the hull. Because this measurement will vary along the length of the boat, it is customarily taken at the transom, or stern. Boats with more deadrise tend to handle rough water better. Boats with flatter bottoms will plane more quickly, but will pound and slam more easily in a seaway and are less desirable when conditions are a bit grumpy. |
#6
posted to rec.boats
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dead rise?
wrote in message oups.com... Bryan wrote: "JR North" wrote in message ... It's the inclusive angle of the hull at the transom, from keel to chine. JR Bryan wrote: What does dead rise mean? My boat has a 19 degree dead rise. -- -------------------------------------------------------------- Home Page: http://www.seanet.com/~jasonrnorth Thanks, but that didn't help. Want to try a simpler or more illustrative explanation? If your boat were a log raft or a sheet of plywood, it would have zero deadrise. The perfectly flat bottom would not rise up above a horizonal line drawn below the boat. The chines (edges of the bottom, sort of) would rest on that horizontal line just like the keel. As the bottom assumes a "V" shape, an angle is formed between the point where the keel meets that horizontal line and the chines. If there were almost no angle at all, you might have a 5-degree deadrise. As the angle gets more pronounced, so does the number of degrees "deadrise" increase. Essentially you're measuring how steep or shallow the "V" is under the hull. Because this measurement will vary along the length of the boat, it is customarily taken at the transom, or stern. Boats with more deadrise tend to handle rough water better. Boats with flatter bottoms will plane more quickly, but will pound and slam more easily in a seaway and are less desirable when conditions are a bit grumpy. Thank you. Nice answer. For perspective, where does 19 degrees fall on the scale. Is it very little dead rise or a lot of dead rise or right in the middle? Maybe it's a question that has too many factors to answer, but I'll ask anyway. |
#7
posted to rec.boats
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dead rise?
"Gene Kearns" wrote in message ... (Keywords: ; Expiry: ; Reply: ) On Sat, 14 Jan 2006 06:30:12 GMT in rec.boats, Bryan penned the following thoughts: What does dead rise mean? My boat has a 19 degree dead rise. More info at: http://www.boats.com/boat-articles/D...orks/1970.html http://www.cymagazine.ca/onlineExclu...veKeyword=3 4 Thanks for the links, Gene. |
#8
posted to rec.boats
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dead rise?
Bryan wrote:
wrote in message oups.com... Bryan wrote: "JR North" wrote in message ... It's the inclusive angle of the hull at the transom, from keel to chine. JR Bryan wrote: What does dead rise mean? My boat has a 19 degree dead rise. -- -------------------------------------------------------------- Home Page: http://www.seanet.com/~jasonrnorth Thanks, but that didn't help. Want to try a simpler or more illustrative explanation? If your boat were a log raft or a sheet of plywood, it would have zero deadrise. The perfectly flat bottom would not rise up above a horizonal line drawn below the boat. The chines (edges of the bottom, sort of) would rest on that horizontal line just like the keel. As the bottom assumes a "V" shape, an angle is formed between the point where the keel meets that horizontal line and the chines. If there were almost no angle at all, you might have a 5-degree deadrise. As the angle gets more pronounced, so does the number of degrees "deadrise" increase. Essentially you're measuring how steep or shallow the "V" is under the hull. Because this measurement will vary along the length of the boat, it is customarily taken at the transom, or stern. Boats with more deadrise tend to handle rough water better. Boats with flatter bottoms will plane more quickly, but will pound and slam more easily in a seaway and are less desirable when conditions are a bit grumpy. Thank you. Nice answer. For perspective, where does 19 degrees fall on the scale. Is it very little dead rise or a lot of dead rise or right in the middle? Maybe it's a question that has too many factors to answer, but I'll ask anyway. It depends on the length and purpose of the boat. 19º +/- 2º is pretty common for bluewater boats in the 18' - 25' range. As Chuck said, more deadrise will tend to handle rough water better. If the boat is very long, the deadrise is less important. Look here for some more info... http://powerboat.about.com/od/mainte.../aa012403b.htm Dan |
#10
posted to rec.boats
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dead rise?
"Dan Krueger" wrote in message nk.net... wrote: Good explanation, Chuck. One thing to point out is the tradeoff. A higher deadrise (assuming a fairly small boat) will result in more tossing at rest or at anchor. Dan And, if I remember correctly, more power to achieve and maintain plane. Eisboch |
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