+ Reply to Thread
Page 2 of 9 FirstFirst 1234 ... LastLast
Results 11 to 20 of 87

Thread: n-Arrow3b build

  1. #11
    Join Date
    Nov 2007
    Location
    Basel, Switzerland
    Posts
    98

    Default Re: n-Arrow3b build

    Hi
    I'd suggest that if you would like to install a lever arm system, even though space is rather tight , it is very feasible.
    I have installed lever arm systems in my SliM and SliM2 Footys and can manage to acheive an effective arm length of about 50mm (from center of servo to sheet take-off loop). The key is to offset the servo to the point where it is very nearly touching the hull on one side to achieve sufficient clearence for the arm swing on the other side.
    I have also used lever arm systems in my RG65s where, although my narrowest beam is a rather wide 110mm by todays standards, there is plenty of room to spare without the need to offset the servo much beyond the centerline.
    If you're interested, I'm happy to post some pictures, however, .........
    I've been locked out of this forum for about a year and have discovered a few friends have also been locked out but none of us are aware that we've contravined any regulations!
    The only reason I'm accessing the forum right now is that I'm on holiday and, on the off chance, having logged in on a different computer I dicover that I can gain access!
    Regards to all
    Phil

  2. #12
    Join Date
    Aug 2003
    Location
    Minnesota USA
    Posts
    3,811

    Default Re: n-Arrow3b build

    Phil, please collect and send me the IP addresses of all involved, plus their screen name and current email address. I will try to see if I can access and off-set any blocks. It "might require changes to name but will do what I can as an administrator - but know that I don't have "owner's right".

    Blocking in the past was done by IP address so if I can find them, it is the easiest way for me to do resets.

    Dick. Send all info to: Formula48[at]comcast[dot]net

  3. #13
    Join Date
    Apr 2005
    Location
    Toulouse (Fra)
    Posts
    3,289

    Default Re: n-Arrow3b build

    Hi Phil
    I appreciate your message, but the servos affair related to this design was already treated at the begin of the design of RG65 n/Arrow presentation as recalled in attachment link with both type of servo, Winch and Arm
    see: http://www.rcsailing.net/forum1/show...truction/page6
    Attached Thumbnails Attached Thumbnails Click image for larger version

Name:	RG65 Servos.jpg‎
Views:	110
Size:	268.1 KB
ID:	15559  

  4. #14
    Join Date
    Nov 2010
    Location
    Johannesburg
    Posts
    252

    Default Re: n-Arrow3b build

    And a happy new year to you too
    I just got back from camping in sweltering heat so I need to catch up on the discussion

  5. #15

    Default Re: n-Arrow3b build

    Hi Claudio, and Bonne et heureuse annee 2016.

    this is a good point and a lot of the new IOM design have a raised deck not only to help the boat come out of a nose dive quicker but also to bring those air flows naturally on the jib. as they follow the deck and end up on the foot of the jib. Not sure this is allowed in RG tought.
    No race is finished till the finishing line is crossed !

    IOM Goth XP (Frank Russell Design), Frank RD sails, RMG winch
    A Class Sweet 9, Frank RD sails and RMG Winch
    Replica of Jet Service 2 1.7m in sailing condition
    Mni40 - Cobra sailed again in Nov 12. Great fun !
    Mini40 - Coyote in construction
    Dragon Force RG65 in sailing condition
    2m Trimaran project: first draft drawings done.

    www.IOMIRELAND.org
    www.ACLASSIRELAND.org

  6. #16
    Join Date
    Nov 2010
    Location
    Johannesburg
    Posts
    252

    Default Re: n-Arrow3b build

    So a raised deck it shall have! There is the side profile in the one set of drawings.
    Does anyone have input on the radius/angle for the raised bits?

    Sanding is almost done and I just need to fill one or two spots and then do the final finishing for the mould.
    My brother is going to build the mould with me. He is a commercial model maker by trade so it will be nice to help him and watch/ learn. This will also allow me to blame him for any issues

    I'm going to attempt the keelfin/rudder with either an NACA 0006 shape. Should be an amusing undertaking that will quite possibly be replaced by the skin method used. It's more for me to say I attempted a foil than anything else.

  7. #17
    Join Date
    Nov 2010
    Location
    Johannesburg
    Posts
    252

    Default Re: n-Arrow3b build

    Click image for larger version

Name:	image.jpg
Views:	63
Size:	24.6 KB
ID:	15562

    Starting to be nice and smooth.
    I worked out that a 0006 profile will be 3mm at the top of the fin so I think I'll try for a 009 which gives me 4.5 thickness which seems more do-able.

    Any comments will be appreciated

  8. #18
    Join Date
    Apr 2005
    Location
    Toulouse (Fra)
    Posts
    3,289

    Default Re: n-Arrow3b build

    Hi, apparently the bow is still relatively large enough.
    3 mm stain-steel rod should be OK.
    Picture rezised
    Cheers
    Attached Thumbnails Attached Thumbnails Click image for larger version

Name:	ND Arrow-3.jpg‎
Views:	59
Size:	136.2 KB
ID:	15563  

  9. #19
    Join Date
    Aug 2003
    Location
    Minnesota USA
    Posts
    3,811

    Default Re: n-Arrow3b build

    For my own nARROW build, I was fooling with the keel and bulb and found that I could purchase a commercial unit for far less than the time/effort to build a keel, and bulb mold, and then pour for the bulb. After looking, and considering, I proceeded to purchase a keel fin and bulb originally designed for the Dragon Force 65 (plastic) boat that is such a hit. As I recall, the entire unit (bulb and fin) came to less than $40.00 (US) and was very close to the dimensions and suggested weight originally provided by Claudio. He was looking for a bulb weight of 675 gr. and my purchased bulb came in at 557.9 gr. This is a bit less weight than his suggestions, but the keel blade is aluminum - not carbon/foam, and while I haven't weighed it, I think it may compensate for the bulb weight difference. Also the length of the replacement keel is also very close to Claudio's suggestions, so that is what I will be using. Photo is of my nARROW during construction, but prior to exterior hull epoxy.

    Just a possible alternative for a reasonable cost.

    Cheers, Dick

    Click image for larger version

Name:	IMG_20151021_154710_resized.jpg
Views:	94
Size:	99.6 KB
ID:	15565

  10. #20
    Join Date
    Nov 2010
    Location
    Johannesburg
    Posts
    252

    Default Re: n-Arrow3b build

    Thank you Dick,

    Unfortunately our exchange rate has decided to kill any idea of buying anything based abroad. We went from about 10:1 to 16:1 in the last six months:(
    Shipping etc. will make it even more exhorbitant as I would have to use a courier to ensure it actually arrives at my doorstep as opposed to getting "lost" in our postal system.
    I will however do a search for a local reseller of the DragonForce and see if anything comes up.

    HOWEVER......

    Here are bulb plans using the BulbCalculater and Claudio's dimensions.
    It seems to be the closest match to his weights and dimensions, and I got the lowest wetted surface with that foil shape.
    I am attaching both the txt file for people to punch in themselves or the pdf it plotted out to use the lead films.

    63-0xx_2-AllViews.pdf
    NACA630xx2.txt

    I am thoroughly enjoying learning all this stuff and becoming very aware of how many brilliant people there are out there. That "little" app is sheer genius. Much respect to the programmer.

    Cheers
    Andrew

+ Reply to Thread

Similar Threads

  1. Build Log first sailboat build - footy Razor
    By jusval in forum General Discussion (Footy)
    Replies: 63
    Last Post: 03-13-2010, 08:40 PM
  2. What to build next?
    By JohnB in forum The Local Pub
    Replies: 12
    Last Post: 07-08-2004, 10:02 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts