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    Modified 5hp just for fun 🤩

    Been a long time since I’ve been on the forum.
    Hi Ron, I still have very fond memories of visiting your prop factory when I was over from Australia, you are very kind and accommodating mate.
    ...
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    It goes hard! It uses heaps of fuel and is...

    It goes hard!
    It uses heaps of fuel and is fairly loud.
    Believe it or not I have never tried a true race prop on it as I know the ratio in the shifting case is terrible.
    I put a 12 pitch...
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    Thanks heaps I will chase it up. Out of interest...

    Thanks heaps I will chase it up.
    Out of interest has anyone tried the late model 15hp carb on there race 15? I know it would be illegal to race though. I tried one on my 15hp today and seemed to...
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    Sweet, Just wondering what the extra exhaust...

    Sweet,
    Just wondering what the extra exhaust bulge under the hood clip is as I don't see it on any of the a motors on the web?
    Also do I need to change the cd pack under the flywheel back to the...
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    Thanks guys, Wow 45kg boat , I can do the boat...

    Thanks guys,
    Wow 45kg boat , I can do the boat at 45kgs.
    I am 74kgs. Are the normal drivers of these boats all kids or do some adults drive too?
    Where would I find a race lower unit?
    How does the...
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    Anyone?

    Anyone?
  7. Replies
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    15hp race motors please teach me.

    Hi there,
    I am very interested in learning all about the 15hp omc race motors.
    I live in Australia and have lived race boats for a while.

    1) What year models of Johnson- Evinrude 15hp motors...
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    Prop fun

    Hi there,
    That's funny, I don't think Ron is worried about a hack like me, he is more than welcome to take copies of this if he likes.
    Cheers,
    Glenno
  9. Replies
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    Extra cup added

    Hi all,
    I added a lot more cup to the prop, runs heaps better!
    Needs another balance and a polish now though.

    Youtube of test two.

    https://youtu.be/itiL0UEKKJY

    26.5mph on crappy old heavy...
  10. Replies
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    Prop cup.

    Hi all,
    I did make the prop with a tiny cup but it's near non existant. I have added more cup and I will try it again, starting at full height (prop shaft 1/2 below bottom of boat).
    Cheers,
    Glenno
  11. Replies
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    Home made propeller

    Hi all

    Just tested my home made prop at all transom heights from centre of prop shaft level with bottom of boat all the way down to standard full depth in 1/2 inch increments. Didn't seem to hook...
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    True not 30hp, as many mods as imaginable to the...

    True not 30hp, as many mods as imaginable to the power head. 1 to 1 gear ratio, props ranged from 13 pitch to 15 you can probably calculate the revs yourself, I never had a tach connected. Total set...
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    Thanks Ron

    Cheers Ron, it will be interesting to see how it performs. I will cut the skeg of for sure.

    About my accident- the boat is pictured below.
    I will post some footage of the boat running too.
    It...
  14. Replies
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    Finished prop!

    G'day,
    Thanks heaps guys and thanks for all the input.
    All finished now and polished.
    It's been a fun project, I am a builder (houses etc) so this has been fun as it's creative but very different...
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    Prop ballance

    Hi mate,
    That's exactly what I did, great minds think alike! I did lay some thin steel on top of each level. The heavier blades drop to the bottom for sure. I even turned the threaded rod 180 deg in...
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    Home made prop ballance

    Hi all,
    Just finished balancing the prop (static ballance)
    Thought a good way to test for vibrations would be just wack it in my drill.
    Youtube of test prop spin on drill rig.
    ...
  17. Replies
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    Homemade propeller

    G'day,
    Hub is going well.
    Aligning the main centre hub took a bit of tinkering to get correct. The bushes centre themselves.
    Just need to dowel the bushes, ballance and polish.
    Ps: I will take...
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    Hub alignment home made prop

    G'day,
    Hopefully all the pieces should self alighn as they push into each other.
    I will spin the prop before welding the centre hub to outer hub for sure to check if it's all aligned.
    Cheers,...
  19. Replies
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    Home made propeller hub

    Hi all,
    I had 2 hours designated play time today so got some hub components fabricated. Need to press the components in and weld the main centre hub to the outer hub and then dowel the bushes in....
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    Home made propeller

    Hi all,
    Well that was hard!!!!
    Getting the blades perfectly positioned took a bit of fiddling, Ron was correct of course about measuring the tips. There is 185mm between each tip to tip...
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    Home made prop

    Hi there,
    Sounds like shot peening is a good idea, does the process make the welded area more maluable and less inclined to crack?
    And I will try to get no voids under weld foots.
    I do like the...
  22. Replies
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    Welding sticks

    Hi there,
    I know the hub is 316L but I'm not too sure what grade the blades are, they are off a 25hp omc stainless prop. I have 316L rods here in 2mm and 2.5mm, I did a small tack weld and it was...
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    Welding blades on hub

    G'day,
    I am stick welding. Done plenty of stick with normal steel and also mig set up for alluminium (built a alloy boat as well) I am also competent with brazing. Unfortunately I have not had much...
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    Peening beads

    Hi there,
    I wasn't thinking of peening the beads, I'm not too familiar with the process and I don't have any mechanical means, I guess I could use some sort of pointy hammer or punch system though....
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    Weld penetration

    Hi there,
    I will definitely chamfer off both sides of the blades where they are to be welded to the hub to get better weld penetration.
    My greatest concern now is controlling the pulling action...
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    Measuring tips.

    Hi there,
    I definitely will measure the tip to tip before I weld fully, good point.
    The motor is an 8hp Tohatsu (slightly modified) hub size is 60mm od and I am trying to achieve around 13 pitch...
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    Blade position home made prop

    Hi there,
    Hi Ron, hope your well. With blade position I have put a centre punch mark on the hub (in picture below, I am pointing a scrap piece of steel at it). I got these three marks by just...
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    Home made propeller

    Hi,
    I will make sure to leave a good amount of weld on for sure, good info Jeff, last thing I want is for it to tear apart.
    Just gave all members a quick buff to make final finish easier.
    Cheers,...
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    Home made propeller

    Hi all,
    Just finished the jig for holding the blades as I weld. We will see if it works, I know as soon as you tack weld stainless it moves, I am hoping to get this thing really accurate but at the...
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    Hi mate, Yep the blades are progressive pitch...

    Hi mate,
    Yep the blades are progressive pitch the whole way up the blades.
    It will be 13 in the centre. I have three props here that are 13 pitch which I am modeling my pitch off, two of those...
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    Home made propeller

    Hi all,

    I Have added a trailing lip to the blades, they all still need to be sharpened and polished.
    I have also started on a pitch block (I decided it does not need to be that pretty as I will...
  32. Replies
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    Home made propeller

    Hi all,
    I am giving making a tubed cleaver for a 8hp Tohatsu a go.
    Chopped blades of one of my Johnson 25hp stainless props and re-shaped, still a bit of fine tuning on blade shape to go.
    Will...
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    True, at the level this motor is modded a single...

    True, at the level this motor is modded a single carb could do the same job for sure. But two carbies is really cool, just something I wanted to do. I had a pile of old omc 9.9hp and 15hp junk and...
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    Hi Jeff I am not sure about the affect on power...

    Hi Jeff
    I am not sure about the affect on power band from the long intake. I only did them so I could fit the 2 carbies on top of each other (there was no room tight to the reed cover). The power...
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    5930359304593055930259289592905929159292 Just...

    5930359304593055930259289592905929159292
    Just thought I would post some pics of the finished motor. I ended up putting 2 15hp carbies on, high speed jets took a while to sort and had to put on some...
  36. Correct propeller help please. 4.5hp Johnson (not a misprint on Hp)

    Hi all,
    I am a fellow racer, I dont race the 4.5hp though, would be a long slow race!
    Just wondering if any one else has a 4hp or 4.5hp deluxe johnson (around 1981 mod) that would be willing to...
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    Super mod 15hp omc help

    Hi all,

    I was wondering if any one out there has modified the older smaller capacity 15hp omc.
    I would apreciate any input as I have started a few mods on a junk motor I have.
    I will start with...
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    help 60 70 75 hp johnson evinrude guys for phill

    Hi Phill,

    Now you will get lots of good input from lots of people I am sure!

    remember also with props that if its stamped 24 it may be actually 22,23,24,25 or 26 by some one elses pitch...
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    Hi Phill, Now we are talking! What is make...

    Hi Phill,

    Now we are talking!
    What is make and HP is your outboard? And what sort of boat are you running it on?
    6000 is good rpm for fully submerged, sounds like a good start!

    After we all...
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    Hi Phill, I dont think your being thick or...

    Hi Phill,

    I dont think your being thick or smug, I ran through all the same questions when I started racing, as the way race boats props run was also against everything I had learned over a life...
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    Hi phill, I have been pondering on the good...

    Hi phill,

    I have been pondering on the good questions you have raised about surface props etc.

    I will try to explain what I have found with surface piercing props through the years I have...
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    Hi all, I definately dont run extra pick ups,...

    Hi all,

    I definately dont run extra pick ups, I would be disqualified, the scruteneers would see it strait away.

    yes the cone is to pick water up but the speed is gained by reducing the amount...
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    Hi again, I forgot to say in regard to set...

    Hi again,

    I forgot to say in regard to set back- a lot of the guys running in the mono hulls at our club have no set back at all and are running the centre of the prop shaft in line with the...
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    nose cones

    Hi Jeoff,

    Yeah I noticed a massive diference in a number of ways.

    1) without the nose cone I would never be able to run the motor as high as i do and still pick up water (our rules dont allow...
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    low pick ups

    Hi all,

    Sory I didnt catch this thread earlier, I love talking nose cones!

    Phill, I really think you would be fine just to make a two part filler nose cone. I race the 25hp and 550cc super...
  46. 10 spline tohatsu splines.

    Hi mate,
    I race 25hp boats here in Australia, I run the mercury sea pro 25hp (built in japan by tohatsu).

    I had the same issue when I bought a 10 by 18 merc chopper, even down to buying a wrong...
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    Hi there, We use these trim blocks here in...

    Hi there,

    We use these trim blocks here in Australia for our fine trim adjustment.
    we just make them ourselves.
    Well done and have fun,
    Glenno
  48. Thread: omc 25hp

    by Glenno
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    25-30-35 carb

    Hi, The 35hp carb is off the older models around 80 and older I think. I have never put the 35 carb on the later 25s but they are the same motor so i dont see why not. The only difference will be...
  49. Thread: omc 25hp

    by Glenno
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    So its a long shaft. You need to get it up out of...

    So its a long shaft. You need to get it up out of the water for more speed so a short shaft is easier as it means a smaller jacking block. But in saying that a taller block should do the trick. A...
  50. Thread: omc 25hp

    by Glenno
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    See if any of the GT pro guys have any input...

    See if any of the GT pro guys have any input before going to wild on porting. I believe they are reaching speeds of around 78kph. I rebuilt the late model 25 in the previose pics and noticed that...
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