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

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

  1. 2far2drive
    Joined: Nov 2011
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    2far2drive Senior Member

    the tool i mentioned will allow frame by frame analysis or you can use it to step through the video without having to pause it all the time and try and "catch" something. Just friendly advice :)

    we used it because the narcs had a hidden camera inside of an alarm remote for a car. They would wave it quickly when talking to look "normal" and resulting video was heavily blurred. However when I showed them this tool, frame by frame step we could export a frame and clearly see the face of the dealers. Case Closed.
     
  2. Doug Lord
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    Doug Lord Flight Ready

    MPX Testing and Development

    Thanks-much appreciated. I'm going to learn more about video editing down the line....
     
  3. 2far2drive
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    2far2drive Senior Member

    I think we are getting lost on the nomenclature. You dont have to "edit". This software actually does not edit in the traditional sense, its more of a "post edit" compression/deinterlace/blur/convert software.

    BUT.....

    You can load up a video, and step through it frame by frame veryyyyy easily and extremely quick without computer lag. stop and examine a frame and if you like it, hit FILE -> EXPORT AS JPEG and whammo, you have a picture from the video frame. that easy... You dont need to "edit". Just review.

    Im only recommending it because a) its free b) the interface is so simple to use. literally FILE -> OPEN the video and you are done. just press arrow keys. c) its super fast and literally elementary school layout. nothing fancy.

    I just have this feeling you are trying to watch a video and hit pause fast enough to catch things. Huge waste of time IMHO. :):)

    Excited to see your next test
     
  4. Doug Lord
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    Doug Lord Flight Ready

    MPX Testing and Development

    2f2D-everytime I upload to youtube they say: "we do not recognize your video format but we will try to upload it anyway". I have no idea what the format is and it's not in the manual? But, the screen shots have been by other people-not me and I have no interest in going through the video frame by frame. As I said earlier I want to learn a lot more about video but not until I've got the boat working at 100%. I do appreciate the info!
     
  5. oldsailor7
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    oldsailor7 Senior Member

    Doug, I am no expert but just as a lay opinion I don't think you have enough "Lift" on the ama foils.
    Increased area is better than increasing the AOA. Since an increase in SFD is preferable to an increase in induced drag. Just my HOP. :cool:
     
  6. Doug Lord
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    Doug Lord Flight Ready

    MPX Testing and Development

    ======
    Paddy, if we* sail tomorrow, we're going with double the AOI on the ama foils in the last video just to try to find the limits.
    we= Dan, Doug +Fire Arrow (Her Majesty)
     
  7. Doug Lord
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    Doug Lord Flight Ready

    MPX Testing and Development----Light Air, Again...

    1-3 mph with gusts to 4 mph. We went to two different sites and found a really good place at Port Canaveral near the lock. Of the other five sites we've checked out this is by far the best. We were able to sit in the shade! Only downside was that there are rocks that you can't see as you walk the boat out and one time I almost fell with the transmitter in my hand. That would have been costly-and won't happen again. And the boat ran into a rock as I was bringing here in-made a sort of sickening ,hollow bang(no damage). The site is excellent in north, east , south and maybe southwest winds. When we got there the wind was 4-6-nearly perfect. By the time she was assembled it had dropped to 3 and from then on never over 4 and only in gusts was it even 4. There's an ugly crease* in the main that wasn't there in the stronger wind-something too tight for the light air-it was perfect in the stronger breeze just after we arrived. It will be a week from today, at the earliest, before we try again. Remember, we're looking for 5-8 for the next test-more than 8 no sail until we have the foils dialed in. Under 5 no sail unless we think the wind will increase as we did today-then it just died. Both of us had commitments this afternoon and ,of course, it's perfect if a bit too strong right now.
    * apparently only visible on port tack..
    --video now has music....

    https://www.youtube.com/watch?v=FF7cy8AoFnU&feature=youtu.be
     
  8. Doug Lord
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    Doug Lord Flight Ready

    MPX Testing and Development-----Light Air Again....

    The little tracker that you may be able to see mounted above the rudder said our top speed today was 4 mph which is a 33% increase in our light air speed over the speed in the last light air sail in the same conditions. But the little sucker also said we flew 100' high!
    click---
     

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  9. Doug Lord
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    Doug Lord Flight Ready

  10. rapscallion
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    rapscallion Senior Member

    Thanks for posting the new video, Keep them coming!
     
  11. Doug Lord
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    Doug Lord Flight Ready

    MPX Testing and Development

    You're welcome!
     
  12. Doug Lord
    Joined: May 2009
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    Location: Cocoa, Florida

    Doug Lord Flight Ready

    MPX Testing and Development---------Reefing

    When I first assembled the rig I couldn't come up with a good way to reef it with the rotating wing mast-but I did tonight. I will cut out a 20" section of the mast and modify it so it can be reinserted into the mast. I did this kind of thing on much smaller models years ago and initially I didn't think it would work on this one. Now I know it will with a minimum gain in weight of probably around half a pound-that is no problem. This won't be done until after the next sail this coming Thursday.
    Other mods that will have to be done with the reefing system are:
    1) a new attachment of the jib at the top of the mast-it may have to extend forward a bit to allow the square top jib to work. This will be easy or hard depending on exactly how far forward the tang will have to be extended.
    --
    2) removable lowers will be added for both reefed and normal configuration.
    --
    3) Velcro patches will be used to fasten the main after the lower section is rolled up. This part of the system I've done successfully many times on other models.
    The top of the rig and the bottom of the rig are the same for reefed or normal-same vang,same boom, same Wing Tip. The down haul will have to be redone so it can be changed between the two configurations. The shrouds probably have enough adjustment to work for both configurations.
    Here are the various configurations and their maximum pressure in pounds per sq.ft..
    Note: maximum RM is 64.24 ft.lbs(not including any downforce from the main foil)
    Configurations: (result rounded )
    1-Normal: Main +mast + jib=23.5 sq.ft. @ 4.33'. Max Pressure= .63lb/sq.ft..
    -
    2-Normal: Main + mast=18.66 sq.ft. @ 4.58'. Max Pressure= .75lb/sq.ft..
    -
    3-Normal: Main + mast + Code Zero= 28.38 sq.ft. @ 4'. Max Pressure= .57lb/sq.ft..
    -
    4-Reefed: Main + mast + jib= 19.39 sq.ft. @ 3.17'. Max Pressure=1.05lb/sq.ft..
    -
    5-Reefed: Main + mast = 14.5 sq.ft @ 3.33'. Max Pressure= 1.33lb/sq.ft..
     

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  13. Jim Caldwell
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    Jim Caldwell Senior Member

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

    Doug Lord Flight Ready

    MPX Testing and Development

    Thanks, Jim! "We're" working on an onboard video system but I may be able to figure out a way to use the camera myself while sailing but I doubt it. Dan's got to start back shortly(coaching a high school football team)-in fact next Thursday may be our last video until I either figure it out or find some help. The boat is extremely awkward to carry and that hurts my back-you basically have 21 lb at your hands with your arms extended almost straight out! I'ts extremely tough for me alone. But it'll get worked out...
    How are you coming with your boat?
     

  15. Jim Caldwell
    Joined: Aug 2013
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    Jim Caldwell Senior Member

    Turn it on its side with the mast over your shoulder?
    With the camera mount just keep the transmitter pointed at the boat.
    Working on foil trunks and cross beams now, so many other things to get done during the summer, but it will be in the water this fall for testing.
     
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