Keel Modification Software Thanks for your recommendations! I am currently evaluating Profili, XFoil and Wings 32. Based on these and the...
Excellent Thread on NACA Keel Shapes Do any of the available software packages accurately calculate the stall angle of attacks, drag, etc. for...
I've heard that my O'Day 37 (70's) keel design has low drag below an angle of attack of 1 degree, but stalls above that, greatly increasing drag...
Root Cause ?? Ssor, We replaced our original Michigan? two-bladed, 18" dia x 12" pitch, fixed prop with a three-bladed, 17" dia x 12o pitch,...
How about 1-1/2 vs 3 gallons/hr at 2500 rpm? Wow! We're no where near 3 gph at 2500 rpm. I'm having our mechanic check the 5432's compression, vs...
Drag from 1-2" skeg to rudder gap ?? Guys, Part of our problem may be the 1-2" gap (along the tangent streamline) between the skeg and rudder,...
I remember the '56 chevy that we rebuilt with a 4-barrel Holley carburetor, high compression head and racing cams. She went from 200+ to 350+ hp!!...
Sheeting Angles ? It's interesting that you should ask. For maximum close reaching, I had the staysail sheet blocks 1/2 way between the mast...
Aerodynamic Models for Cutter Rigs ?? Is anyone aware of an aerodynamic model for cutter rigs? US Sailing's Velocity Predictor Program won't...
Are two sails more efficient? You're right about the two new sails replacing the old Genoa, but wouldn't the extra surface area of the staysail...
Theoretical Hull Speed for 30'6" LOW ?? Very interesting. US Sailing's Performance Program predicted boat speeds up to 7.5-8 knots in 20 knot...
Weather Helm for O'Day 37 ..... Yes !! It's good to compare notes about weather helm. We can trim the sails to within 2 degrees of neutral...
Infinitely long keel the best :?: Okay, so an infinitely long keel would (theoretically) be best, since all of the wetted area contributes to...
We've been told our Universal Diesel (Model #5432 - 32 hp) is undersized for our 37' O'Day sloop (30'6" LWL). During rally's we have a hard time...
Rounded keel bottom vs shaped flat plate ?? Very interesting. :idea: The rounded-bottom, "extended keel", vs the current flat-bottom keel,...
Positive Attitude !! :) What a great attitude! You made my day! Captain Rich
Gain Not Worth The Pain ?? I've included a photo of our O'Day shortly after we took her down to the gel coat, put three layers of barrier epoxy...
Worth a try? Your points all seem like it's worth a try if a) it doesn't take much effort and b) it's reversible. I figure that making a...
Try half a plate to see what the benefits are ?? Interestingly the Boat US article talked about testing 1/2 a plate (i.e. the Port Side only) to...
Is it worth adding a teardrop shaped end plate to the bottom of a NACA flat bottomed fin keel on our O'Day 37 center cockpit sloop designed by...
