[NSRCA-discussion] Reducing the odds...

[Rex LESHER]

Guys, some of our grief with cooling outrunner motors is being remedied by the manufacturer.  They are beginning to install fans in the motor to pull air through them....   I believe Plettenburg is now doing this on their Extra 30-10.

Rex Lesher
  ----- Original Message ----- 
  From: jeffghughes at comcast.net<mailto:jeffghughes at comcast.net> 
  To: NSRCA Mailing List<mailto:nsrca-discussion at lists.nsrca.org> ; nsrca-discussion at lists.nsrca.org<mailto:nsrca-discussion at lists.nsrca.org> 
  Sent: Tuesday, March 28, 2006 6:00 PM
  Subject: Re: [NSRCA-discussion] Reducing the odds...


  Matt,
  Your missing my point. I have never doubted that a "properly" designed duct can increase cooling. I just doubt that most modelers have  "properly" designed duct work in their planes. The ducts we make increase cooling over not having any duct work, but I've built and flown a lot of planes with engines and motors un-cowled that didn't overheat either! My initial statement was around uncowled outrunner motors. Why not have them up front and exposed? Save a lot of grief and might just look good (or not, it just might look industrial). We as pattern folks always seem to do the harder right, instead of the easier right.

  Jeff


    -------------- Original message -------------- 
    From: rcmaster199 at aol.com 

    Jeff, how do you increase air velocity around the motor with no increase in model airspeed? 
    Here's where our old friend Bernoulli comes in, stage left. 

    And BTW, the properly designed ENTRY into and EXIT from the ducting really increases the ducting efficiency. 

    Cheers,
    Matt
     
    -----Original Message-----
    From: jeffghughes at comcast.net
    To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>; NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
    Sent: Tue, 28 Mar 2006 22:10:39 +0000
    Subject: Re: [NSRCA-discussion] Reducing the odds...


    While I agree good ducting can be better than hanging out there, I seriously doubt if most modelers do any better than hanging it out. Plus I think an outrunner all polished up woul look pretty cool with the fuse faired into it. 

      -------------- Original message -------------- 
      From: "Dean Pappas" <d.pappas at kodeos.com> 

      Good ducting is better than hanging in the breeze, and a whole lot prettier.

      Dean Pappas 
      Sr. Design Engineer 
      Kodeos Communications 
      111 Corporate Blvd. 
      South Plainfield, N.J. 07080 
      (908) 222-7817 phone 
      (908) 222-2392 fax 
      d.pappas at kodeos.com 
        -----Original Message-----
        From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of jeffghughes at comcast.net
        Sent: Tuesday, March 28, 2006 12:49 PM
        To: NSRCA Mailing List; NSRCA Mailing List
        Subject: Re: [NSRCA-discussion] Reducing the odds...


        I was thinking about this the other day. Why don't we change the fuse design to stick the motor out in the breeze? Kind of like a WWI rotary or a foamy.  Seems like we're trying hard to keep the planes identical in design between electrics and fuel for no apparent reasons

        Also now that huge props and braking are available, will fuselages slim down some?

          -------------- Original message -------------- 
          From: "Dean Pappas" <d.pappas at kodeos.com> 

          > Hi Earl, 
          > This sounds a whole lot loke the similar duct I have placed around my AXI 
          > outrunner. 
          > It is astounding how much a difference a real cooling duct makes. 
          > Fans inside the motor are a band-aid. The top-down solution is good airflow 
          > management. 
          > 
          > The picture is of the ductwork in the Funtana I am doing for FM. 
          > The subject is modifying the plane for high-performance electric. (high heat and 
          > RF generation) 
          > The airbox in the front of the cowl encloses the front of the motor, 
          > and feeds the internals and the 1/8" gap in the duct with high pressure air. 
          > 
          > 
          > later, 
          > Dean 
          > 
          > Dean Pappas 
          > 
    Attached Message
          From: Dean Pappas <d.pappas at kodeos.com> 
          To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org> 
          Subject: Re: [NSRCA-discussion] Reducing the odds... 
          Date: Tue, 28 Mar 2006 18:19:00 +0000 

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