How about a motor well with the 17 degrees, and a "false transom" that is flat - like the PH15. The boat can rest on the false transom in garage, but a standard motor may be used. It wouldn’t have to be more than a few inches deep to work.
Joel
17 degree transom angle, where did it come from?
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ks8
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Would the shaft come very close to touching the transom at the bottom of the transom? Or, in other words, how false is the false transom? Maybe a quick sketch would illustrate?
I only ask, because I find this interesting, and would like to know what Jason ultimately decides to do with all the info.
I have relatives with a stream in their backyard, and they too, by neighborhood covenant, must keep any boats either in the water or out of sight. This info might actually get applied in North Carolina. That boat would be a very simple *messing about* boat, and I don't know how it would compare with what Jason has on his mind for a canal boat.
Although, I still like the *look* of the 17 degrees, and I like that it also increases buoyancy the further down the hull would be submerged, and to a lesser degree, increases *roominess* by the transom. And yes, I may be biased slightly due to friendship with some dolphins that are crop circle savvy.
An additional observation... we now have a better idea what the 17 degree transom IS, that is, a transom angle design matched to an industry standard in outboard motor mount design ... but ...
Jason had not asked what the 17 degree angle IS, but rather he asked where it came from? It is right in his title question. We have already heard some justifications for its use. Does anyone have any other details on where it *came from*? In other words, was there a particular outboard manufacturer who did trial tests at various angles on various hull forms, and one day said, *Let's compromise at 17 degrees and everyone will work around it depending on their hull.* Any historians out there? History has been known to offer insights that plain physics can never articulate as *humanly*.
sincerely,
ks
I only ask, because I find this interesting, and would like to know what Jason ultimately decides to do with all the info.
I have relatives with a stream in their backyard, and they too, by neighborhood covenant, must keep any boats either in the water or out of sight. This info might actually get applied in North Carolina. That boat would be a very simple *messing about* boat, and I don't know how it would compare with what Jason has on his mind for a canal boat.
Although, I still like the *look* of the 17 degrees, and I like that it also increases buoyancy the further down the hull would be submerged, and to a lesser degree, increases *roominess* by the transom. And yes, I may be biased slightly due to friendship with some dolphins that are crop circle savvy.
An additional observation... we now have a better idea what the 17 degree transom IS, that is, a transom angle design matched to an industry standard in outboard motor mount design ... but ...
Jason had not asked what the 17 degree angle IS, but rather he asked where it came from? It is right in his title question. We have already heard some justifications for its use. Does anyone have any other details on where it *came from*? In other words, was there a particular outboard manufacturer who did trial tests at various angles on various hull forms, and one day said, *Let's compromise at 17 degrees and everyone will work around it depending on their hull.* Any historians out there? History has been known to offer insights that plain physics can never articulate as *humanly*.
sincerely,
ks
If I remember some previous posts correctly... The GV11 has a plumb transom. These questions were raised by a builder wanting to know if he could modify the plan for an angled transom. Evans provided an option for the raked transom but builders seem to be happy with the original design.
My opinion
is that it's more for an elegant look to the lines of the boat and the motors were built with this standard in mind. Also it sets the motor further aft of the trailing edge of the bottom, a "gill" bracket being an exageration of this technique, providing more performance to some hulls.
Paul Piercey
My opinion
is that it's more for an elegant look to the lines of the boat and the motors were built with this standard in mind. Also it sets the motor further aft of the trailing edge of the bottom, a "gill" bracket being an exageration of this technique, providing more performance to some hulls.Paul Piercey
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Cracker Larry
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Very interesting discussion.
KS, you probably have a fibonacci table or 2 yourself. And a cabinet and a bookshelf, even a photograph. It is also referred to as phibonacci, or just phi, which is generally termed the "golden ratio". This is the ratio of proportion that has been found to be most pleasing to the eye. It is a balanced ratio that just "looks right". It's technical spec is 1/1.61803, but works out roughly to 3/5. Almost all furniture is built closely to this ratio, as are many other things that must please the eye.
But, for the life of me I don't know how it relates to a transom angle of 17 degrees
KS, you probably have a fibonacci table or 2 yourself. And a cabinet and a bookshelf, even a photograph. It is also referred to as phibonacci, or just phi, which is generally termed the "golden ratio". This is the ratio of proportion that has been found to be most pleasing to the eye. It is a balanced ratio that just "looks right". It's technical spec is 1/1.61803, but works out roughly to 3/5. Almost all furniture is built closely to this ratio, as are many other things that must please the eye.
But, for the life of me I don't know how it relates to a transom angle of 17 degrees
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ks8
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hmmm... but would a true fib table stop at 3 x 5? Why not 5 x 8, or 8 x 13, or 13 x 21, or 21 x 34, 34 x 55 ?
It is interesting that the ratios do slightly change as the sequence progresses, yet each pair in the sequence is just as much a fib as the other!
3 x 5 -> 1.666666 up
5 x 8 -> 1.6 down
8 x 13 -> 1.625 up
13 x 21 -> 1.6153 down
21 x 34 -> 1.61904 up
34 x 55 -> 1.61764 down
if we progress further, I suppose it settles down to the 1.61803, but if I finish the chart, I'll never get this jello nailed to the wall, or figure out why I park on the driveway and drive on the parkway...
yes, it's just like 17 degrees, isn't it?
dolphins.... crop circles...
btw, when someone says, *I draw a blank...*, does that make sense? If it's a blank, you haven't drawn anything...
ks
It is interesting that the ratios do slightly change as the sequence progresses, yet each pair in the sequence is just as much a fib as the other!
3 x 5 -> 1.666666 up
5 x 8 -> 1.6 down
8 x 13 -> 1.625 up
13 x 21 -> 1.6153 down
21 x 34 -> 1.61904 up
34 x 55 -> 1.61764 down
if we progress further, I suppose it settles down to the 1.61803, but if I finish the chart, I'll never get this jello nailed to the wall, or figure out why I park on the driveway and drive on the parkway...
yes, it's just like 17 degrees, isn't it?
dolphins.... crop circles...
btw, when someone says, *I draw a blank...*, does that make sense? If it's a blank, you haven't drawn anything...
ks
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ks8
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bong? no. Remember, I prefer to know where I am, how I got there, and how to get back again. But I've got some bongos in the basement I haven't played in quite awhile. Why are they called bongos? The sound they make isn't anything like a *bongo*... maybe more like a *dooongh*? I guess it depends on how tight the skin is. Maybe you could tune them so one is sort of a *bongh* and the other is a *gho*? These things are too deep for me....
ks
ks
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