High Performance MPX Foil/Self-righting Trimaran-The Test Model

Discussion in 'Multihulls' started by Doug Lord, Dec 28, 2010.

  1. Baltic Bandit

    Baltic Bandit Previous Member

    BTW your photos have such clear labels on everything. What is the tool you are using for this great detail? I'm looking for a similar tool - one that doesn't take much time and is easy to use so that I can spend more time on the water.

    And since you've given us photos of the radio gear, can you tell us which control you are going to put on which channel?
     
  2. hoytedow
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    hoytedow Carbon Based Life Form

    I think that is a camera. One usually uses a camera to produce such things.
     
  3. Doug Lord
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    Doug Lord Flight Ready

    ----------------------
    Hoyt, there are hardly any labels on the pictures I posted! The ones with "labels" were done with "MSpaint".
     
  4. hoytedow
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    I thought he was referring to the sharp image.
     
  5. Baltic Bandit

    Baltic Bandit Previous Member

    No Hoyte - was asking what tool Doug used. He has answered by saying it was MS-Paint.... I find that surprising and disappointing since to me Paint is a very cumbersome tool that takes a lot of time to do those kinds of images.

    I had expected that someone as skilled as Doug would be using more advanced tools so that I could learn from the process.
     
  6. hoytedow
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  7. Baltic Bandit

    Baltic Bandit Previous Member

    hmm maybe I'm underestimating it as a program. I find it really hard to position the text with it I guess I'm spoiled by PowePoint and was hoping for that kind of functionality.
     
  8. warwick
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    warwick Senior Member

    BB. You could try paintnet. you can create a additional layer then add text to that layer then merge the two layers. paintnet is a step up from paint but just short of a full photo imaging programe
     
  9. hoytedow
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    I key the words on a blank spot then drag and drop them exactly where I want them.
     
  10. Baltic Bandit

    Baltic Bandit Previous Member

    Thanks, that's the kind of easy function I was looking for. Maybe that will be useful to Doug as well. Is PaintNet hard to use?
     
  11. Doug Lord
    Joined: May 2009
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    Location: Cocoa, Florida

    Doug Lord Flight Ready

  12. Doug Lord
    Joined: May 2009
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    Location: Cocoa, Florida

    Doug Lord Flight Ready

    MPX Test Model

    Heres an important post from a while back. Helpful in summarizing the design of the MPX Test Model in answer to a question about the main foils being so deep:

    -----
    MPX Test Model, Moth sketch and Bradfield Osprey being beach launched(18'LOA X 22' wide):
     

    Attached Files:

  13. Baltic Bandit

    Baltic Bandit Previous Member

    I'm confused doug, what does the Osprey have to do with your boat? The whole mechanism seems different. What am I missing?

    I'm also confused on the use of SA as a measure. I was taught that the lift profile of a board was based on its NACA profile, and its target operational speed as well as its surface area. Was I taught incorrectly?
     
  14. Baltic Bandit

    Baltic Bandit Previous Member

    I'm still confused. In post 656 you talk about sheathing balsa in Dragon plate and how you are gluing the box to the deck but nothing about how you are sealing the edges of the box in a way that is guaranteed to be waterproof. And 664 just talked about other construction

    And I can tell you from sad experience, balsa absorbs water pretty well, particularly end grain on - so I'm curious as to what treatment you are putting on the corners to insure it is waterproof?
     

  15. Doug Lord
    Joined: May 2009
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    Doug Lord Flight Ready

    MPX Test Model-more on the rig

    I've pretty much decided to use the ball bearing Harken traveler mounted just aft of the forward crossarm as a sort of vangeler*. The catch is that the downward pull cannot have a forward component or it will interefere with the rotating wing mast. This will probably necessitate a moving component on the boom. The mainsheet will be centered on the aft crossarm. This is what I'm leaning toward and won't be final until I mock it up outside before long.
    The main winch will control the main and jib/Code Zero with a sheet system that uses a bowsie to adjust the slot manually.
    The main is designed to be able to use a diagonal top batten to hold the big square top but it is also set up to use a modern version of a gaff similar to what I used on the production rc models I built. The "gaff" allows the upper outhaul(attached at the "peak") to be adjustable so camber can be varied considerably on the upper third of the sail. In racing this was very important in light air-not so important when the wind was up. I'ts nice to have the option to go from one to the other. Down the line, I may use some form of masthead flotation but not at the begining.
    * I'm going to look at other alternatives as well, including a "normal" vang(along with the noggle/gooseneck-post 701 below.)

    Pictures, L to R: 1) main showing diagonal upper batten and you can just barely see the "peak" outhaul grommet, 2) & 3) main with jib and with Code Zero,
    4)&5) Flyer 3 production RC tri I designed and built that was about the same size as the MPX(but significantly narrower). I used an adjustable tension gaff and adjustable upper("peak")outhaul along with masthead floatation. The "throat" position was fixed, 6) Dr. Sam took one of these and made it into a test model for his 40' Skat foiler.
     

    Attached Files:

    Last edited: Nov 16, 2013
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