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Thread: Solar Chargers

  1. #121
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    Solar Chargers

    Absolutely more blades equal more drag. But more blades also provide more torque at a lower speed.
    Either way, my 6.4 powerstroke didn't seem to notice.

    Compared to the trolling motor props, this prop was much smoother and quieter.

    For the relative slow speeds of a cub, I don't think it's a concern.


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  2. #122
    skywagon8a's Avatar
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    Blade angle and diameter?
    N1PA

  3. #123
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    250mm I believe. 9 7/8 inches diameter. Prop pitch unknown.


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  4. #124
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    If you get the opportunity will you please place a protractor on the blade at the tip? Or alternatively show a picture of the blade looking towards the hub? I think that I can make one similar to that with some plywood. When laying flat how high (thick) is it?
    N1PA

  5. #125
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    So in conclusion, for the experimental non-electric guy that wants to never have to recharge his battery or wants to run bigger panels and lights....

    Alternator and regulator: $100
    Vetus 250mm SET 0090 thruster prop: $170
    Lathe turned arbor for prop and alternator: TBD.
    Mounting bracket and wiring: owner designed and fabricated.
    Weight : 4 lbs +/-

    Value? To me it will be worth it long term.


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  6. #126
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    Quote Originally Posted by skywagon8a View Post
    If you get the opportunity will you please place a protractor on the blade at the tip? Or alternatively show a picture of the blade looking towards the hub? I think that I can make one similar to that with some plywood. When laying flat how high (thick) is it?
    Pete, it's a complex prop. Somewhat like a Q-tip it has a variable pitch to each blade. Tip is pretty flat and the root is closer to 45. The design is geared to high thrust and low noise.

    If you can actually create this out of plywood, you'd be a heck of a woodworker!! OK maybe more of a furniture maker.






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  7. #127
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    Thanks, Those pictures tell me a lot. I expect the variable pitch as it needs to decrease at each station as it moves out from the hub. Each segment of a blade needs to move through the same distance as the other segments through one rotation. The circumference increases as the diameter increases so the pitch must decrease moving outboard. I'm not an ace woodworker by any means. It's more of a challenge to myself than anything else.
    N1PA

  8. #128
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    Pb,
    From your pictures this is my backyard estimate of the prop numbers. http://www.vetusmarine.com/store/p/6...Propeller.aspx
    Your prop pitch in inches 20". Diameter 9.68". It will turn 4400 rpm at 85 mph. At 108 mph (my Cub) it should turn 5600 rpm.
    N1PA

  9. #129
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    Solar Chargers

    Sounds about right. I tried the next size down, a set 89, (7") and output is substantially less but a good option for smaller loads. But, you have to kick start it again, at least on the ground.
    80 - 4A
    90 - 6A

    It's basically half what the big prop puts out.
    Last edited by Farmboy; 05-18-2017 at 05:43 PM.

  10. #130
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    Thinking about it for a second I'm going to see what it would take to get the small prop to spin up in the air. If you don't draw five or 6 A constantly the small prop would really be ideal.

    If you're flying slower or shorter trips or simply higher loads the large prop would be the obvious choice.




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  11. #131
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    There certainly should be less drag with the 7" prop.
    N1PA
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  12. #132
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    Based purely on observation in the mirror, sound and feel, I believe they're actually very efficient propellers.


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