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Prop Scan

February 4 2010 at 11:15 PM
Mark Weller  (no login)

Has anyone else here on the forum used prop scan? In case you dont know what prop scan is they use a computer with a measuring device to determine the accuracy of your prop. I recently took my 20 x 22 35+ year old props in to be scanned to see if they were out of whack. Some of you know I replaced the cutlass bearings last year but I still had a slight vibration on the starboard side. So thinking the lesser of two evils would be to have the props checked instead of taking out the shafts and having them checked I took that route. Well the results are in and I am amazed so far as to what I was told without divulging any information about vibration etc. I was informed that my starboard prop face was only 27% correct through the blades he asked me if I had a vibration on that side. The port prop was a little better at 57% but it was pitched higher than the stbd was and I was asked if the port motor tended to suck more gas and yes it does. So long story short my props are being reworked and repitched to pick up about 200 rpm so I will now have 20 x 20.8 pitch props they were 20 x 21.710 and 20 x 21.924 with the port being the higher pitch. I was relatively surprised at the overall cost to have them brought up to ISO class 1 standards and be repitched I was quoted less than $300 a prop and I will get a computer certification for the props to be ISO class 1 standard. According to the prop scan guy I should see around a 15% increase in fuel mileage due to how far the 2 props were apart and how far away from standards they were I was at worse than class 3. For information class 3 is a standard MI Wheel prop out of the box. If I can get 1 mpg I will be so happy it isnt funny I get about .78 now. I will post the scans tomorrow or maybe later tonight.

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