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Type: Posts; User: TLL

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    Re: Let's talk props, two or three blades

    Descending order of importance for increasing prop thrust (low speed vehicles)
    more HP:-D
    more prop diameter
    more prop rpm
    more blades
    more pitch

    Multi bld props can involve some thrust...
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    Re: 50HP (Tot) Twin Engine Briggs VTwins on Jon Boat

    It's a rare event that one of these engines will quit running, slightly more likely one might not start for some reason:) I've used a lot of these on para-flyers..not bulletproof but ultra...
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    Re: Let's talk props, two or three blades

    Experience tells me there's a bit of sweet spot concerning blade pitch for slow moving machines (paraflyers @30mph).
    If one has selected HP and a reduction ratio, all that is left for practical...
  4. Thread: Generac

    by TLL
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    Re: Generac

    Actually Subaru/Robin now has 2 versions of the big block engines on their web page (the engine formally sold as Generac). I just bought 2 of the 36hp models, they arrived with Subaru stickers. I've...
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    Re: 50HP (Tot) Twin Engine Briggs VTwins on Jon Boat

    Do you use Cen clutch or one way bearings on the drive pulleys? Curious how you speed/power match the engines.
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    Re: Lightest possible Hull ... Wood or Aluminum?

    Once built a 5x10 flat bottom boat from 1/4" luan and 1x2 cedar strips..lots of glue and screws. covered the the bottom with cheap glued vinyl kitchen flooring from Menards. ran it as an airboat...
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    Re: Lightest possible Hull ... Wood or Aluminum?

    How about 2 sit-on Kayaks as toons?
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    Re: Terry From Michigan

    Thanks for the detail, the design is simple..I like simple:)

    Terry
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    Re: Terry From Michigan

    On my DIY I found I didn't care for the way the hull handled with the air rudder. In sharp turns the boat would tend to lean to the outside and at times try to swamp over the rear outside corner. The...
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    Re: Terry From Michigan

    Can ask the dimensions on the 'toon?

    Terry
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    Re: Terry From Michigan

    Nice..being from the north my airboat vision is an overpowered glade runner that can rip up water, weeds and dry beaches. My experience with a DIY mini airboat was more like 20 mph, no dry land...
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    Re: Terry From Michigan

    I know very little about hulls and water craft, I know a lot about 4 stroke industrial engines, reduction drives & props. I fly with long-belt reductions using banded Vbelts (x style), I've sold...
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    Re: Terry From Michigan

    Thanks. I'm sure there are lots of design caveats. Good advice saves newbs like me from reinventing the wheel..again:)
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    Re: Terry From Michigan

    here's an engine I was fooling with..it'a a Briggs21hp vert shaft single with a twisted belt to horz prop drive. I tested and flew with this setup for awhile..no problems..not saleable to flying...
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    Re: Terry From Michigan

    I'm really trying to learn more about airboat design. I've built a couple airboats by simply parking completed paraflyers on flat bottom hulls. Best performance with a 21hp single cyl Briggs was...
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    Re: New mini: won't plane ?

    You give up a lot with short, flat pitched direct drive props (you probably know that). Also the UP prop is inefficient, partly because it's constant pitch from hub to tip (like a fan blade). I like...
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    Terry From Michigan

    Hi, I'm new here.
    I build 4stroke Powered paragliders for living. Look at 'TERRY LUTKE' on Youtube. Someone suggested my reductions might be useful for air boats..any way just checking in
    ...
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