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  1. hwsiii

    Prop Slip and Blade Surface Area

    Prop Slip and Blade Surface Area Prop Slip is conceivably one of the most misunderstood aspects of prop theory there is. Prop slip has nothing to do with the actual efficiency rating of a particular prop in a model or series of props, it is in fact the speed difference between what the...
  2. hwsiii

    Open letter of apology to 45Auto and Everybody Else

    I want to apologize to you specifically 45Auto for our discussion and some of my statements about maximum speeds attained using higher pitched props for attaining fuel economy while cruising. I am not positive that increasing pitch always results in better fuel economy while cruising with all...
  3. hwsiii

    Does anyone have Full HP and Torque Info on outboards over 150 HP

    I am trying to learn a lot more about motors than I now know. I have good knowledge of propellers but my knowledge of motors is non existent. When I was a kid I rebuilt one, only because I didn't have the money to buy a new one, but what little knowledge I had then I have lost with time and age...
  4. hwsiii

    Changing Props for Performance and SS versus Aluminum

    When you are looking to improve the performance of your boat you should have a better understanding of what to look for in a new prop versus your old prop, and the other changes that can increase your maximum speed and cost you nothing except your time and a little bit of labor. ALL boat motors...
  5. hwsiii

    Aluminum Versus Stainless Props

    Replaed http://forums.iboats.com/showthread.php?t=369057 H
  6. hwsiii

    Changing Any Prop for Better Performance

    Replaced http://forums.iboats.com/showthread.php?t=369057 H
  7. hwsiii

    Some Advantages of Four Blade Props

    Replaced http://forums.iboats.com/editpost.php?do=updatepost&p=2458311 H
  8. hwsiii

    Prop Picker form for Rascal38

    Rascal here is the empty form, all you have to do is copy it to the clip board and paste it into Microsoft Word. Iboats Boat and Motor Info 1. Year, make and model of boat 2. Length, width and base weight of boat, look for boat decal on back of boat 2a.What is the maximum recommended HP for...
  9. hwsiii

    cmayer85 chaparral 187 Prop Size

    prop size? can you please help me with finding a good prop size for my boat. Iboats Boat and Motor Info 1. 1983 chaparral 187xl 2. 17.67 feet long and weighs 2200 (pounds dry). The beam of this craft is 86 inches 2a. 150hp i think 3. usually 3-6 people and i fill it up everytime before...
  10. hwsiii

    cbrboy Prop Help

    cbrboy, I need more information, please fill this out. Iboats Boat and Motor Info 1. Year, make and model of boat 2. Length, width and base weight of boat, look for boat decal on back of boat 2a.What is the maximum recommended HP for your boat 3. Number of people and gallons of gas normally on...
  11. hwsiii

    Kymasabe Rascal Prop

    Kymasabe, I started a posting beause Iboats does not allow you to put pitures in Instant messages and I wanted you to see what is going on with your motor and prop at this time. In my opinion hanging props an make a lot of differene in the speed and handling of a boat. At this point in time I...
  12. hwsiii

    Hydrafoils versus Trim Tabs

    It seems there are many questions asked about Hydrafoils and Trim Tabs on a regular basis, so I tried to compare the two with each other. There are tremendous amounts of Hydrafoils sold every year under different brand names, they serve a purpose or they couldn't sell them in those amounts...
  13. hwsiii

    1995 Force 40 HP How many poles for Tach

    HI, I am trying to find out how many poles I have on my motor so I can buy the correct tachometer, right now I use a Tiny Tach but I want a real tach for it. H
  14. hwsiii

    A Study of one Boat with some Charted Analysis Part 1 & 2

    No Interest H
  15. hwsiii

    Turning Point Hustler and Rascal Props

    Does anyone know the EXACT amount of Rake or Zero Rake, Fixed Pitch or Progressive Pitch and whether they have Trailing Edge Cup or Blade Tip Cup. I would like to start recommending these props as entrance level, low cost alternatives to stainless props. But I have no way I can do this without...
  16. hwsiii

    Measuring Prop Pitch at Home FIXING

    This is an easy way to measure the pitch of your prop at home instead of having to go to a prop shop and pay them. The following items will be needed to do this: A. Carpenters Square B. Compass C. Protractor Normally prop pitch is measured at about 70% of the Radius of the prop. When you...
  17. hwsiii

    SilverZuk Sea Nymph

    Silver, I found your boat to have a base weight of 620 pounds and with an allup weight of about 1,500 pounds, the motor appears to have a recommended WOT range of 4,500 to 5,500 RPM and a gear ratio of 2.42:1. If this is wrong my numbers will be wrong as well. You will want a 17" Pitch prop but...
  18. hwsiii

    Walleyehed's Prop Tests Charted and an Analysis

    Kenny?s Prop Tests and an Analysis I took all of Walleyehed?s ( Kenny Sanderson) prop test results and ran a complete analysis of his results to see what kind of information I could extract that might be useful to all of us. I tried to do the analysis in most cases by using the props that were...
  19. hwsiii

    Dhadley

    I have noticed you say before in a posting that some motors do better at higher RPM than at the manufacturers recommended RPM. I am trying to understand why this is true. Many years ago I was with a friend and we had been trolling for about five hours at low RPM with his boat that had a 135...
  20. hwsiii

    THe Black Art of Propellers

    Propellers A boat propeller is an airfoil, just like an airplane propeller or the wing of an airplane. It has a low pressure side where the water comes in and a high pressure side where the water is expelled. In theory the most efficient propeller has one blade, has a very large diameter and...
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