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.
https://m.youtube.com/watch?v=fz3jtMb6tng
Cheers,
Glenno
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.
https://m.youtube.com/watch?v=fz3jtMb6tng
Cheers,
Glenno
Good enough.
Jeff
"We live at the bottom of an ocean of air." - General Marvage Slatington
The best way to balance your new prop is this:
1- Make sure your threaded rod or test shaft is straight and true by laying it on a flat surface and rolling it to see if it has any wobble.
2- If it is true, now get two carpenters levels and lay them parallel to each other edge up. Make sure they are level at both equal height and end to end (on blocks and shimmed).
3- Now take your threaded rod (test shaft) with prop mounted and lay it across the levels with the prop able to wheel in between suspended levels (like a railroad track).
The way to do this is to gently rotate the prop a few degrees at a time. Do this patiently and gently release so as to see if the prop will hold position without rolling forward or back. You can tape little pieces of material to determine the final balance any place on the prop if needed. This will be the best way to do this.
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 prop after I was happy with ballance to be extra sure.
Ps: I did parallel the the levels.
Cheers,
Glenno
Excellent! Glenno, I would like to say that your project isn't just a home-made propeller....it is a fine and precise work of art that will prove successful. It looks perfect!
From testing of my own homemade props, I can see in your video that the balance is close enough. When the balance is off significantly, the prop will jump about enough to scare you!
Jeff
"We live at the bottom of an ocean of air." - General Marvage Slatington
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 than what I do during work. I always tinker and fabricate weird stuff and play with outboards constantly but this has really stretched me.
I don't have any race boats at the moment but I will put it on my tinny with a jacking plate and post the results here in kph and mph.
Either way it looks great on the shelf!
Cheers,
Glenno
Impressive job for a 1st.
" Three may keep a secret if two of them are dead" Ben Franklin
" ------- well Doctor what have we got a Republic or Monarchy? A Republic he replies if you can keep it"
Benjamin Franklin, 1787 Constitutional Convention, as recorded by signer James McHenry's in his diary at the Library of Congress
Location: SW Orlando, Fl
Sweet Glenno. You need another cat project.
Argo Cat 18 - Sold
Merc 2.4EFI/CLE - Sold
It is too bad more people don't try to make thing for themselves.
Cliff Bedford owned an "OLD PEOPLE'S" home in San Diego. He raced boats, he was probably 60 plus years old. But by testing every afternoon, his boat designs changed the face of boat racing. Some of his propeller "CONCEPTS" are probably just being discovered today.
He was a "HANDS ON" old fart....probably had no formal education, but he did things himself and the results were amazing.
Glenno, you mentioned you had an accident....would you mind telling us what happened?
Lon Stevens, one of the greatest two stroke men in America, raced C Service until he had an accident. The accident left him with a hand I never saw, as he kept it covered with a glove.
The countless hours spent by Lon on the in line Six Mercury motors can never be calculated as I'm sure he worked on these motors in his sleep.
If you wish to build more propellers, I can suppluy you with blade and hub castings at a very reasonable price.
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