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Thread: gap seals

  1. #1
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    gap seals

    following the good advice out there on cleaning up the airframe of long
    hoses and com stuff thats dead, someone out there has a form337 or stc
    for gapseals? also the skin on flaps/elevators could be improved by
    installing the newer skins without the ridges or use the indented type
    to get back the increased surface area? anyone done that?


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  2. #2

    gap seals

    There isn't any STCs for aileron gap seals and I am unaware of anyone, but me, that has flown with them.  Yeah, I did.  Just to see if it was worth the effort, I sealed the ailerons on my Sierra.  It was worth it.  My Sierra realized about a 3-4 knot improvement.  Had to remove them though, my particular seal type (available from Home Depot) turned out to be susceptible to freezing at altitude when wet.  I would expect you could see 2-3 knots on a Sundowner & Super III, and 1-2 knots on a 150-165 hp Musketeer.  Might see 4-5 knots on a Dutchess.  But, because of the small improvement and the small population of Musketeers in general, I doubt you could make a business case for obtaining an STC.  I also doubt the FAA would allow this on a 337 form as the flight chareristics will have to be verified.  That would require a flight test DER to test fly an airplane
    and provide and sign off a report to be submitted with the 337 form (same as an STC).  I figure that would cost plenty....... probably more.
     
    I wouldn't bother with the ailerons themselves as there is little to gain there.  I have done a tuft test, but I would imagine that the ailerons are flying in some pretty dirty air to begin with.  It's real hard to achieve laminar flow on an airfoil back to the ailerons.  It's a matter of return on investment.  I doubt you could measure any improvement.  Wouldn't work without aileron seals anyway.
     
    All that being said, there are ways to improve your cruise speed.  The "Forum" has plenty of activity on this.  I'm no expert on aerodynamics, but my layman's impression is there are a few knots of gain lurking in every Musketeer.  Much has to do with attention to detail.  Some has to do with the way you load and fly the airplane.  But if you have a fixed pitch propeller, expect small gains in speed without re-pitching (there are limits as to the number of times you can re-pitch a prop).  Probably the biggest speed boost available for the Musketeers is the Powerflow exhaust for the carburated Lyc's.  The "Speed Spats" from Robin Thomas (Laminar Flow Systems http://www.laminarflowsystems.com/ ) for the fixed gear airplanes is up there too.  How much speed with both?  Robin has that answer.  Want more speed?  Get a Sierra or Dutchess.  Want serious speed? Get a
    Bonanza or Mooney.
     
    Marty Vanover
    Phoenix, Az.

    --- On Sat, 5/31/08, fredloehr <fredloehr@yahoo.com> wrote:

    From: fredloehr <fredloehr@yahoo.com>
    Subject: [musketeermail] gap seals
    To: musketeermail@yahoogroups.com
    Date: Saturday, May 31, 2008, 10:28 AM






    following the good advice out there on cleaning up the airframe of long
    hoses and com stuff thats dead, someone out there has a form337 or stc
    for gapseals? also the skin on flaps/elevators could be improved by
    installing the newer skins without the ridges or use the indented type
    to get back the increased surface area? anyone done that?


















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