Aggressive Mini Speed Boat Sketch...would it work?

Discussion in 'Boat Design' started by LilWake, Jan 17, 2013.

  1. tunnels

    tunnels Previous Member

    wow

    What kind a weed you guy smoking !! Try scream and fly the mini boat section . They love to have a good laugh i reckon!!:confused::eek::D:p
     
  2. myark
    Joined: Oct 2012
    Posts: 719
    Likes: 27, Points: 38, Legacy Rep: 57
    Location: Thailand

    myark Senior Member


    LiWake
    I like your design and the fact you are turning it into reality, from what I can see it’s a good chance it will work and as you know after a proto type is made there is always room for slight adjustments, naturally.
    All my own designs are not copied and are made from thought and turned into reality so as you would also know do not take notice of Tommy knockers.

    This is the correct boat design forum for small and any other type or size boat designs.
     
  3. IMP-ish
    Joined: Jan 2011
    Posts: 389
    Likes: 9, Points: 18, Legacy Rep: 150
    Location: united states of america

    IMP-ish powerboater

    It would be easy to make these out of aluminum and make the styled part above the waterline a channel. The aluminum turn fins adjust up and down in the channel with two bolts to hold them in place. Then you can test with very little. Have a good chase boat. A good kill switch. A real life jacket. And a helmet with neck collar to test for tripping and minimize the risk if it flips.
     
  4. PAR
    Joined: Nov 2003
    Posts: 19,126
    Likes: 498, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    He's been given sound advise, which he's mostly ignored. He doesn't understand the dynamics he's fooling with, therefore why it will trim the way I (and other professionals) suggest. He's trying a whole bunch of stuff, much of which aren't compatible with each other and it seems a sure fire way to get someone hurt.

    It doesn't seem to matter which issues are pointed out; "washed out" chines, huge buttock angles with a delta, sponsons, steps, whatever - there are clearly dangerous aspects to the design, as doodled. As sketched, it has no hope of ever seeing 50 MPH, as it's instability issues will appear long before that. I'm sorry this is difficult to read, should I water it down further? Just because you'd rather they not be true, don't mean they aren't, just that you're in denial about them. Yes, we could make suggestions and point out things, but this has been done, throughout the thread (once the laughing died down) and some has been absorbed, just to have the doddle reinforced, by those that haven't a clue about the dynamics involved, particularly at 50+ MPH. Simply put and as suggested previously, a more solid grasp of the fundamentals is necessary, if wanting climb this far out on the design limb. In light of the lack of this, a more conservative approach is the logical route.

    If you need to be patted on the back and told how clever this design is, continue discussing it with amateurs and novices without any design understanding. That will help considerably in this regard, but it'll still point it's nose in the air with the first WOT blast and dance around like a wild horse, until it capsizes from shape induced instability, assuming you don't roll it over in a turn first. Yeah, this sucks and it could be fixed, but this isn't the best format for a dissertation on yacht design. Some research and study on your part would solve a lot of the issues this sketch has, so instead of being offended, maybe opening a book or two and trying to absorb some of the fundamentals, might be a better method than taking a stylish guess and hoping for the best.
     
  5. myark
    Joined: Oct 2012
    Posts: 719
    Likes: 27, Points: 38, Legacy Rep: 57
    Location: Thailand

    myark Senior Member

    Because it’s a new design like it was suggested to make from aluminum a prototype or even low cost plywood and maybe a smaller scale model that can easily be modified.

    It’s no big lose as all the parts can be used again as it would only be a proto type that you will not use but a guide for the end result.

    You can play safe and do the conventional methods but I do not think that’s what you are doing it for.
    If you fail it does not matter as long as you enjoy the challenge.
     
  6. Jet_Love
    Joined: Dec 2012
    Posts: 33
    Likes: 2, Points: 0, Legacy Rep: 57
    Location: little Rock, AR

    Jet_Love Junior Member

    I heard that stuff can make one creative and laugh as well as giving another point on view.

    I wonder if it would help me talk to the boat gods?
     
  7. PAR
    Joined: Nov 2003
    Posts: 19,126
    Likes: 498, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    Models are a good way to develop radical ideas, without absorbing a lot of costs. Of course, the data can be limited, depending on the testing, but obvious things will jump right out. For example, the washed our deadrise will rear it's habits instantly, once you get the model moving. The beak on the bow, might not display what it will in a full size version, but it will still "root around" causing steering issues, without dumping the skipper in the drink as you learn this lesson. Refining the delta's shape could benefit from model testing, ditto strakes, as could the sponson's thingie. Some foam, some weights and a fishing rod will get you a primitive model and test rig.
     
  8. myark
    Joined: Oct 2012
    Posts: 719
    Likes: 27, Points: 38, Legacy Rep: 57
    Location: Thailand

    myark Senior Member

    I can explain an example of a new design suspension for a small Myark floating trailer I recently designed and manufactured in China.

    The thought stage was similar to your small jet boat sketched on paper which was anxiety provoking.

    I decided to make every part from scratch which made me think more on redesign and problems such as the torsions suspension rust, weight and rubber cords that do ware out and cannot be replaced.

    I noticed there was no such thing made in titanium ever on the world market let alone the hubs and axles or axle arms from titanium, I had recently been designing and manufacturing tools from gr5 titanium and had a good relationship with the titanium lost wax investment casting factory.

    I was also lucky to have another workshop that makes mould tooling who I have known for 8 years and they let me develop my ideas in their work shop for basic cost.

    I designed the mould tooling and manufactured it, then cast the parts in titanium and made a aluminum casing that held the rubber cords to come apart with one pin so the cords can be DIY replaced as they cost $1 each cord or $4 a side.

    I placed a grease nipple on the back axle out of harm’s way and to allow the grease to compact the bearings keeping water out which is fare superior to bearing buddies...,

    The end design weighed made from gr5 titanium including the hub and axle is 5 kg each side torsion suspension and is suited for a 750 kg load trailer which I like to slide into inserts so they can be easily removed especially for boating.

    I do not know if there is a market or not but I enjoyed what I was doing and if it worked that was satisfaction enough and if it did not my anxiety for the project would put to rest.

    Its similar to art.
     

    Attached Files:

  9. FMS
    Joined: Jul 2011
    Posts: 611
    Likes: 22, Points: 18, Legacy Rep: 227
    Location: united states

    FMS Senior Member

    Testing using a small scale, or for this small boat, a full scale remote control boat would reduce personal injury risk to a minimal.
     
  10. kerosene
    Joined: Jul 2006
    Posts: 1,285
    Likes: 203, Points: 63, Legacy Rep: 358
    Location: finland

    kerosene Senior Member


    Or he is plain right. Boats don't plane or perform certain way 'just because'. You choose to get super pissy and defensive when the people with actual experience point out flaws. Apparently they don't do it in a specific manner which you would approve. Well - welcome to the world.

    You would learn more if you didn't concentrate on being butt hurt.
     
  11. Jet_Love
    Joined: Dec 2012
    Posts: 33
    Likes: 2, Points: 0, Legacy Rep: 57
    Location: little Rock, AR

    Jet_Love Junior Member

    Hi par, here is a better pic. I was thinking the top 2 are a spray strip and the bottom is a step. And in the second pic of the Seedoo boat what kind of design is the hull where the bond line steps down?

    Thanks,
     

    Attached Files:

  12. LilWake
    Joined: Feb 2012
    Posts: 149
    Likes: 7, Points: 0, Legacy Rep: 53
    Location: Minneapolis, MN

    LilWake Senior Member

    I am not at all defensive about the design and I have appreciated all of the feedback. What I am not agreeing with is the smart *** comments that follow. As I said in the beginning, I am not an engineer so why would I be offended if my drawing was off. I expected that things would need tweaking.

    There is simply no reason to be a smart ***, just because you have more knowledge than others on a particular subject. If you aren't here to help, but rather just to insult and ridicule then GTFO. And don't give me this "internet is hard to judge intention" BS. I know a smart comment when I see one. I haven't jumped on anyone that hasn't tried to sneak in a blow.

    Back on topic...
     
  13. PAR
    Joined: Nov 2003
    Posts: 19,126
    Likes: 498, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    The lower "leading edges" aren't in the running surface, except at displacement speeds or when plunging. I suspect they are intended to knock spray forward when the boat does plunge, so you don't have to eat it. They would also increase hull volume during a plunge (slightly), though I think their value is dubious, maybe just marketing tool to separate themselves from the other PWC.
     
  14. tunnels

    tunnels Previous Member

    Does it look good or bad ?? its just a fashion thing !! has nothing to do with performance :D

    Thanks
     

  15. Jet_Love
    Joined: Dec 2012
    Posts: 33
    Likes: 2, Points: 0, Legacy Rep: 57
    Location: little Rock, AR

    Jet_Love Junior Member

    I could lean this ^ way myself but I was thinking it could help get it in the running surface.

    Anyway thanks you for the responce.
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.