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Thread: Will this pitch be enough?

  1. #1
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    Default Will this pitch be enough?

    Hi. Im currently planning my first hovercraft. In a quick summary, it will be shaped with foam and then fiberglassed and will have 2 16" ducts with an elevon system. Havent bought engines yet but Im fairly sure thrust will be about 15-20hp. Hopefully it'll look similar to this but for 3-4 people.



    I was planning on maybe getting these propellers for the thrust on amazon.
    http://www.amazon.com/Electric-Prope...86076&sr=1-114

    And something like this for the lift.
    http://www.amazon.com/4-Blade-Propel...4686253&sr=1-6

    (forum rules arent too clear on links, so mods edit them out if they arent)

    Anyways, the thrust ones are 2 blade, 16" and have a 12" pitch. The lift is 4 blade, 11" with 9" pitch.

    I know higher pitch = less acceleration and higher top speed but I cant find anything online on what pitch is generally used, at least not for 2 small fans. I have found 30+ for large ones but I assume 2 smaller will be just as good? Or are these propellers designed for model planes not powerful enough? Thanks.

  2. #2
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    Default Re: Will this pitch be enough?

    A bit Square for my liking, and doesn't look very practical.

    For a first time project I would go for something already available and that is going to work.

    Get plans and stick to them. !!!!!!!!!!!!!!!!!!

    You have a great idea here but for a first time I would go another route. OK maybe I am not the person for this as my first attempt sank..

    BUT I did learn that the advice given on this forum is worth its worth in GOLD.

    And one of the things mentioned to all mewbies is, STICK TO THE PLAN.

    I am now on my second build after 5 years of happy hovering with an odd problem here and there just by following the advice given here.
    In the beginning there was the Cube; I know where is came from and it has the power to create Hover life. But with great power comes great Fun.

  3. #3
    Forum God > 400 posts Club Member Jon Pert's Avatar
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    Default Re: Will this pitch be enough?

    Welcome

    I have to say I don't think 15-20hp will be enough to be honest!

    How much will the craft weigh (approx)?

    ETA: Cracking username by the way.
    Last edited by Jon Pert; 11-Jun-09 at 11:59 AM.
    Cheers

    SixpackPert



    "Computer games don't affect kids. If Pacman would have affected us as children, we would now run around in darkened rooms, munching pills and listening to repetitive music"

  4. #4
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    Talking Re: Will this pitch be enough?

    "You have a great idea here but for a first time I would go another route. OK maybe I am not the person for this as my first attempt sank.."

    First Hoversub by Atters ..lol
    Freedom One & Freedom TS3 Manufacturer

  5. #5
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    Default Re: Will this pitch be enough?

    Quote Originally Posted by Jon Pert View Post
    I have to say I don't think 15-20hp will be enough to be honest!

    How much will the craft weigh (approx)?

    ETA: Cracking username by the way.
    Im not sure on the weight, I guess the 3 passengers would be 150 pounds each plus the 2 motors and clear platics vinyl for windows and fiberglass (epoxy) body... Those propellers are fiberglass too so it should be pretty light? It will also mostly be used on pretty calm water.

    Next week i'm going to a local guys place that has a lawn mower and lawn tractor junkyard. I was going to see if they had any with horizontal shafts (which did exist from what i've read) but thats why I guessed it would have 15-20 at thrust.

    Also that image is just a model. It wont look exactly like it, simplified a bit in structure, but will lift up on car hatch shocks (like an X-Wing i guess). My friend and I want to build our own since thats part of the fun for us, as a hobby. Oh, and yeah I have a red afro hence the name lol.

  6. #6
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    Default Re: Will this pitch be enough?

    The only pitch you want is enough to pitch it in the trash bin.
    Yet another daft design that does not have a cat in hells chance of working.
    Over the years we have seen many such totally impractical fantasies where appearance is all and reality is left way behind.

    I strongly suggest you spend sometime looking at the wealth of information available on this forum .
    There is an accumalation of countless years of experience here.
    I also suggest you do a lot more research on the basic physics of the hovercraft principle.

    We never used 16" ducts 50 years ago let alone today, and 20 hp for a 3-4 seater!!!!!

    IF ONLY.

    Regards,
    Kip

  7. #7
    Forum God > 400 posts Club Member Jon Pert's Avatar
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    Default Re: Will this pitch be enough?

    Quote Originally Posted by KipMac View Post
    The only pitch you want is enough to pitch it in the trash bin.
    Yet another daft design that does not have a cat in hells chance of working.
    Over the years we have seen many such totally impractical fantasies where appearance is all and reality is left way behind.

    I strongly suggest you spend sometime looking at the wealth of information available on this forum .
    There is an accumalation of countless years of experience here.
    I also suggest you do a lot more research on the basic physics of the hovercraft principle.

    We never used 16" ducts 50 years ago let alone today, and 20 hp for a 3-4 seater!!!!!

    IF ONLY.

    Regards,
    Kip
    The man speaks sense (bit harsh but fair )!

    If you wish to build then I would seriously recommend buying a set of plans. Build exactly to the plans and you will get a hover that actually works and that you will have instant gratification from.

    Trying to build a craft from scratch without much knowledge will only end up in an unfinished project neglected in the corner of your yard.

    Please don't take these as negative comments, only realistic ones. We have many members who have built from plans (Sevtec, ASV etc) and have fantastically capable craft and as Kip says this site has a wealth of information available both in the articles published and with the membership. There is an archive of our magazine going back some 35 years and more forums available to club members with information and tips.

    If you have anymore questions then please ask away!
    Cheers

    SixpackPert



    "Computer games don't affect kids. If Pacman would have affected us as children, we would now run around in darkened rooms, munching pills and listening to repetitive music"

  8. #8
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    Default Re: Will this pitch be enough?

    Na I dont take offense easily, and I'd rather someone be harsh than me build something that could never work. I'll look into plans more closely to see if any site has something very appealing.

    I was wondering though, why are most hovercrafts 1 thrust propeller (or fan) instead of two in an elevan system? The elevan seems just as easy or easier and it has reverse and sharper turning, right? Also, if I did 2 duct propellers, what would be about the minimal diameter then because its really hard to find any designs to model that have 2 smaller instead of 1 big.

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