GFinch
Well-Known Member
O.K. here I am again. Looking for help from the family. I have read the patents and taken a few sections and pics from them for show and tell.
My question is about the strakes (88 90) on YOUR boats.
Is your pad strake longer then 2 feet. How long is it?
Is it the same as the two outer strakes, width and height?
What model and year?
On my 1994 XB2003 the pad has been changed and I need to know how much different the newer ones are. The strake on my pad is just barely discernible, I can feel it but barely see it. There has been enough sanding on the bottom that either it wasn't as pronounced on my year or it was sanded down.
My thinking is, the models newer then 1996, have more pronounced strakes. I need to know how much!
I'm thinking of making it like the description in the patent. 1/2" wide and 1/16" tall at a 15 degree angle. I'm in the process of making a sanding tool for this. It's not perfect, neither am I.
Below are excerpts from the patents and threads.
http://forum.allisonowners.com/showthread.php?t=3314&highlight=patent
or
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=/netahtml/PTO/search-bool.html&r=0&f=S&l=50&TERM1=Darris&FIELD1=&co1=AND&TERM2=Allison&FIELD2=&d=PTXT
figure 12 14 15
#12 is looking up at front to rear pic of pad or bottom of boat. Strakes are #88 and #90
#14 is the rear of pad #92 and #94 are the aera of the strakes.
#15 is a side view of the Allison Lip.
http://patimg2.uspto.gov/.piw?docid=US004584959&PageNum=4&IDKey=671DE729FB0D&HomeUrl=http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2%26Sect2=HITOFF%26p=1%26u=%252Fnetahtml%252FPTO%252Fsearch-bool.html%26r=9%26f=G%26l=50%26co1=AND%26d=PTXT%26s1=Darris%26s2=Allison%26OS=Darris%2BAND%2BAllison%26RS=Darris%2BAND%2BAllison
Figure 13
This is a cross section of the bottom of the boat or pad. #90 and #88 are strakes.
http://patimg2.uspto.gov/.piw?docid=US004584959&PageNum=5&IDKey=671DE729FB0D&HomeUrl=http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2%26Sect2=HITOFF%26p=1%26u=%252Fnetahtml%252FPTO%252Fsearch-bool.html%26r=9%26f=G%26l=50%26co1=AND%26d=PTXT%26s1=Darris%26s2=Allison%26OS=Darris%2BAND%2BAllison%26RS=Darris%2BAND%2BAllison
Figure 16 13 15
In figure #13 strakes would be about #14 #20 #24
Figure #15 is a blow up of strake aera #20
http://patimg1.uspto.gov/.piw?docid=US005983823&PageNum=5&IDKey=22270B3326E4&HomeUrl=http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2%26Sect2=HITOFF%26p=1%26u=%252Fnetahtml%252FPTO%252Fsearch-bool.html%26r=6%26f=G%26l=50%26co1=AND%26d=PTXT%26s1=Darris%26s2=Allison%26OS=Darris%2BAND%2BAllison%26RS=Darris%2BAND%2BAllison
Figure 3
Strakes are in the aera of #14 #53 and #24
http://patimg1.uspto.gov/.piw?docid=US005983823&PageNum=3&IDKey=22270B3326E4&HomeUrl=http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2%26Sect2=HITOFF%26p=1%26u=%252Fnetahtml%252FPTO%252Fsearch-bool.html%26r=6%26f=G%26l=50%26co1=AND%26d=PTXT%26s1=Darris%26s2=Allison%26OS=Darris%2BAND%2BAllison%26RS=Darris%2BAND%2BAllison
Below are excerpts from the patents.
The distal ends of the cuts 72-82 terminate at the inner edges of strakes 88 and 90 which are formed along and defines the longitudinal edges of the pad 12. The strakes 88 and 90 terminate, at one end, at the back edge 82 and at the shoulders 28 at the other end. The strakes 88 and 90 are generally horizontal in cross-section and are optimally one-half inch in width for a twenty foot boat. The strakes 88 and 90 may range from about three-eighths to five-eighths of an inch in width. If the strakes 88 and 90 are less than three-eighths inch in width, they do not provide enough lift and the hull is slower, but if the strakes are greater than five-eighths inch, the lift is too large and it causes drag.
By minimizing the width of the present invention strake tread surfaces 75 as shown by FIG. 15, lateral flow velocity and energy of the displacement water across the strake tread surface is substantially terminated along the strake corner adjacent lip 72. As this rapidly moving water flow leaves the strake surface 75 over the strake corner, the small, down turned corner lip 72 gives the flow spray a turning bias down into the water body. Additionally, the relatively sharp edge of the lip 72 creates a sharp concentration of shearing forces in opposition to the fluid adhesion forces. Hence, the lateral flow of displacement water is biased and energized to drive itself away from the strake at the lip 72.
The included angle 68 of these intermediate lifting strakes is preferably between about 95.degree. to about 110.degree.. It is also preferable to curl the corner edge of the strake with a lip 72 projecting downwardly about 1/16 in. below the horizontal surface.
In FIG. 14, a perspective view of the back edge 82 of the pad 12 is shown, and referring to FIGS. 12 and 14, it is clearly shown that the corners 92 and 93 thereof are beveled slightly at an angle of about fifteen degrees. This slight beveling reduces the drag of the pad 12.
A side profile or cross-section of the back edge 82 of pad 12 is shown in FIG. 15. As shown therein, edge 82 includes a slight lip 96 that has a vertical height of between one-sixteenth and one-eighteenth of an inch, and the back edge 98 of the lip 96 is beveled at a forty degree angle with respect to vertical. The function of the lip 96 is to provide additional lift at the rearmost position of pad 12.
The distal ends of the cuts 72-82 terminate at the inner edges of strakes 88 and 90 which are formed along and defines the longitudinal edges of the pad 12. The strakes 88 and 90 terminate, at one end, at the back edge 82 and at the shoulders 28 at the other end. The strakes 88 and 90 are generally horizontal in cross-section and are optimally one-half inch in width for a twenty foot boat. The strakes 88 and 90 may range from about three-eighths to five-eighths of an inch in width. If the strakes 88 and 90 are less than three-eighths inch in width, they do not provide enough lift and the hull is slower, but if the strakes are greater than five-eighths inch, the lift is too large and it causes drag.
My question is about the strakes (88 90) on YOUR boats.
Is your pad strake longer then 2 feet. How long is it?
Is it the same as the two outer strakes, width and height?
What model and year?
On my 1994 XB2003 the pad has been changed and I need to know how much different the newer ones are. The strake on my pad is just barely discernible, I can feel it but barely see it. There has been enough sanding on the bottom that either it wasn't as pronounced on my year or it was sanded down.
My thinking is, the models newer then 1996, have more pronounced strakes. I need to know how much!
I'm thinking of making it like the description in the patent. 1/2" wide and 1/16" tall at a 15 degree angle. I'm in the process of making a sanding tool for this. It's not perfect, neither am I.
Below are excerpts from the patents and threads.
http://forum.allisonowners.com/showthread.php?t=3314&highlight=patent
or
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=/netahtml/PTO/search-bool.html&r=0&f=S&l=50&TERM1=Darris&FIELD1=&co1=AND&TERM2=Allison&FIELD2=&d=PTXT
figure 12 14 15
#12 is looking up at front to rear pic of pad or bottom of boat. Strakes are #88 and #90
#14 is the rear of pad #92 and #94 are the aera of the strakes.
#15 is a side view of the Allison Lip.
http://patimg2.uspto.gov/.piw?docid=US004584959&PageNum=4&IDKey=671DE729FB0D&HomeUrl=http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2%26Sect2=HITOFF%26p=1%26u=%252Fnetahtml%252FPTO%252Fsearch-bool.html%26r=9%26f=G%26l=50%26co1=AND%26d=PTXT%26s1=Darris%26s2=Allison%26OS=Darris%2BAND%2BAllison%26RS=Darris%2BAND%2BAllison
Figure 13
This is a cross section of the bottom of the boat or pad. #90 and #88 are strakes.
http://patimg2.uspto.gov/.piw?docid=US004584959&PageNum=5&IDKey=671DE729FB0D&HomeUrl=http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2%26Sect2=HITOFF%26p=1%26u=%252Fnetahtml%252FPTO%252Fsearch-bool.html%26r=9%26f=G%26l=50%26co1=AND%26d=PTXT%26s1=Darris%26s2=Allison%26OS=Darris%2BAND%2BAllison%26RS=Darris%2BAND%2BAllison
Figure 16 13 15
In figure #13 strakes would be about #14 #20 #24
Figure #15 is a blow up of strake aera #20
http://patimg1.uspto.gov/.piw?docid=US005983823&PageNum=5&IDKey=22270B3326E4&HomeUrl=http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2%26Sect2=HITOFF%26p=1%26u=%252Fnetahtml%252FPTO%252Fsearch-bool.html%26r=6%26f=G%26l=50%26co1=AND%26d=PTXT%26s1=Darris%26s2=Allison%26OS=Darris%2BAND%2BAllison%26RS=Darris%2BAND%2BAllison
Figure 3
Strakes are in the aera of #14 #53 and #24
http://patimg1.uspto.gov/.piw?docid=US005983823&PageNum=3&IDKey=22270B3326E4&HomeUrl=http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2%26Sect2=HITOFF%26p=1%26u=%252Fnetahtml%252FPTO%252Fsearch-bool.html%26r=6%26f=G%26l=50%26co1=AND%26d=PTXT%26s1=Darris%26s2=Allison%26OS=Darris%2BAND%2BAllison%26RS=Darris%2BAND%2BAllison
Below are excerpts from the patents.
The distal ends of the cuts 72-82 terminate at the inner edges of strakes 88 and 90 which are formed along and defines the longitudinal edges of the pad 12. The strakes 88 and 90 terminate, at one end, at the back edge 82 and at the shoulders 28 at the other end. The strakes 88 and 90 are generally horizontal in cross-section and are optimally one-half inch in width for a twenty foot boat. The strakes 88 and 90 may range from about three-eighths to five-eighths of an inch in width. If the strakes 88 and 90 are less than three-eighths inch in width, they do not provide enough lift and the hull is slower, but if the strakes are greater than five-eighths inch, the lift is too large and it causes drag.
By minimizing the width of the present invention strake tread surfaces 75 as shown by FIG. 15, lateral flow velocity and energy of the displacement water across the strake tread surface is substantially terminated along the strake corner adjacent lip 72. As this rapidly moving water flow leaves the strake surface 75 over the strake corner, the small, down turned corner lip 72 gives the flow spray a turning bias down into the water body. Additionally, the relatively sharp edge of the lip 72 creates a sharp concentration of shearing forces in opposition to the fluid adhesion forces. Hence, the lateral flow of displacement water is biased and energized to drive itself away from the strake at the lip 72.
The included angle 68 of these intermediate lifting strakes is preferably between about 95.degree. to about 110.degree.. It is also preferable to curl the corner edge of the strake with a lip 72 projecting downwardly about 1/16 in. below the horizontal surface.
In FIG. 14, a perspective view of the back edge 82 of the pad 12 is shown, and referring to FIGS. 12 and 14, it is clearly shown that the corners 92 and 93 thereof are beveled slightly at an angle of about fifteen degrees. This slight beveling reduces the drag of the pad 12.
A side profile or cross-section of the back edge 82 of pad 12 is shown in FIG. 15. As shown therein, edge 82 includes a slight lip 96 that has a vertical height of between one-sixteenth and one-eighteenth of an inch, and the back edge 98 of the lip 96 is beveled at a forty degree angle with respect to vertical. The function of the lip 96 is to provide additional lift at the rearmost position of pad 12.
The distal ends of the cuts 72-82 terminate at the inner edges of strakes 88 and 90 which are formed along and defines the longitudinal edges of the pad 12. The strakes 88 and 90 terminate, at one end, at the back edge 82 and at the shoulders 28 at the other end. The strakes 88 and 90 are generally horizontal in cross-section and are optimally one-half inch in width for a twenty foot boat. The strakes 88 and 90 may range from about three-eighths to five-eighths of an inch in width. If the strakes 88 and 90 are less than three-eighths inch in width, they do not provide enough lift and the hull is slower, but if the strakes are greater than five-eighths inch, the lift is too large and it causes drag.
