Mike Bull wrote:
DamienB wrote:I suspect this is one that will rumble on until the beast is in one piece and somebody hangs a plumb bob off a plank across the top of the tail...
Just picking this point up again because following on from Damien's posting there, I've been making a study of this height issue both to satisfy myself and to help Neil with his second edition. At the moment the rear end of the boat is fully built up- tail cover bolted down, tail fin in situ- so it's been possible to make a much better job of measuring the overall height from the top of the fin, to the bottom of the planing shoe- the height between the yellow lines in this chunk from Damien's profile artwork-
Allowing for perhaps no more than a quarter of an inch margin of error, the overall height comes to 93 inches- or seven feet nine inches. The rudder is still put away at the moment and we can't put it on anyway because the boat is still in her rollover jig, so for now we can't measure that too to see if we can finally make up that mystery 8 feet four inches. But that's our height- seven foot nine.
Thanks for your help with measurements, over the last week. However, just to correct one discrepancy, the measurement in the book was 8.04
' feet, or 96.48 inches which is approx 3.7% higher than the 93 inch or 7.75' measurement. The difference was never that great, and certainly not the 7 inches an 8' 4'' (100'') measurement would imply. We have made reference to the discrepancy between the two measurements (7.75' or 8.04') in the book, but in terms's of the use of the measurement to estimate the position the boat's track, this is well within the margin of error.
The measurement on page 242 includes to the bottom of the rudder and is stated as 8' 8.5'', or 104.5'' This implies that the rudder would extend either 11.5 inches below the shoe, taking the 93'' measurement, or 8.02' below the shoe, taking the 96.48'' measurement. An 8'' drop below the shoe looks more appropriate, so that would imply that the overall height of no less than 101.5' and no greater than 104.5''. It would be worth confirming how much the rudder drops below the shoe.
All the numbers we used were from measurements on Norris Bros. docs, the measurements Mike supplied were from K7 herself.