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Thread: wheel fairings

  1. #1

    wheel fairings

    >I have a friend that wants to buy a set of wheel fairings as on the C24Rs. They are to be used on an experimental >retract. Any body out there have some or know of a good source? Paul

    Huh? C24R is a retract (Sierra) and has no "wheel fairings". (Not that I have ever seen any wheel fairings on any Musketeer series plane, but certainly not on a Sierra.) Could you mean the "hub caps" that cover the axle nut? LoPresti has their "Hubba-Hubba Caps" for standard Cleveland 6" wheels. Wag Aero and Aircraft Spruce sell 6" wheel covers, both flat sheet with 3 holes for the screws and a stamped shape with some contour to the outside.

    --Bob Steward A&P IA
    Birmingham, AL


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  2. #2

    wheel fairings

    I assume you are talking about the wing-mounted fairings on the C-model Sierras, that are fore and aft of the retracted main gear wheels. Beech hasn't had them for years, and no one else is making them. They are available only as salvage items.

    It is also quite easy to make a foam form for fairings like this, then attach it to a backing plate with the correct curvature for the wing surface. Release compound is applied and a thin but strong layup made, using a light (thin) grade of unidirectional glass cloth (available at a good hobby shop),and a resin such as Vinylester (not Polyester auto resin). The thin lightweight cloth, when cut and laid "on the bias" (meaning the cloth weave is diagonal to the part's centerline), is very easy to work around curves. The mounting flange is formed by flaring out the cloth at the bottom of the form. The flange edge is left ragged until it cures, then is trimmed with scissors to width.

    You can use the blue Superfil material from Aircraft Spruce to fine-finish the form, as well as to final-fill the outside of the fairing prior to priming. Keep in mind that the fit should be as close as possible to the tire. The front of the leading fairing should be curved to resemble the leading edge. The Beech leading fairing does not have the ideal front shape; it is too blunt. The aft fairing should be tapered aft as far as is practical. The Beech main gear aft fairing is actually only about 2/3s as long as it should be, and is too abrupt where the flange is formed on the trailing edge. It is also unduly "draggy" by virtue of the stiffening channels molded into the ABS plastic, generally unneeded in a fiberglass design. A glass design can easily be stiffened, if needed, by glassing a piece or two of very light balsa wood onto the inside surface.

    The overlapped fairings that were made for the flap brackets, during the experimentation by the Sierra engineering group, went almost to the trailing edge of the wing. An experimental aft fairing that I made for the retracted nose gear wound up a tad too wide for the wheel, and wasn't long enough. I was unable to tell any effect at all during its testing (meaning back to the drawing board).

    Your friend would be better off to make his own, and to use an internal flange having small access holes for a screwdriver. It can then be custom-designed and fitted for best looks and function. Those holes can be filled with removable sealant, if the fairing has to come off, and the concealed fasteners will look smoother and have less drag. The perimeter of the fairing can then be neatly and tightly caulked. The internal flange can be made by wrapping the cloth around the bottom of the mold, rather than flaring it out over a molding mount plate. He is probably already aware, but in lay-ups the strength is in the glass; the resin just holds it in position. Excess resin is just wasted weight. Sort of like concrete-reinforced steel construction; all the strength is in the steel bars; the concrete just keeps them from bending. Excess concrete beyond the design just adds weight and cost, with no added strength.


    >I have a friend that wants to buy a set of wheel fairings as on the C24Rs. They are to be used on an experimental >retract. Any body out there have some or know of a good source? Paul<

    [Non-text portions of this message have been removed]



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  3. #3

    wheel fairings

    Hi, Group,
    Paul may mean the wing fairings on the C24R.
    They are little" bumpouts" under the wing, around the wheel wells.
    Ray Griffin

    -----Original Message-----
    From: musketeermail@yahoogroups.com
    [mailto:musketeermail@yahoogroups.com]On Behalf Of
    n76lima@mindspring.com
    Sent: Thursday, September 01, 2005 10:46 AM
    To: musketeermail@yahoogroups.com
    Subject: Re: [musketeermail] wheel fairings


    >I have a friend that wants to buy a set of wheel fairings as on the C24Rs.
    They are to be used on an experimental >retract. Any body out there have
    some or know of a good source? Paul

    Huh? C24R is a retract (Sierra) and has no "wheel fairings". (Not that I
    have ever seen any wheel fairings on any Musketeer series plane, but
    certainly not on a Sierra.) Could you mean the "hub caps" that cover the
    axle nut? LoPresti has their "Hubba-Hubba Caps" for standard Cleveland 6"
    wheels. Wag Aero and Aircraft Spruce sell 6" wheel covers, both flat sheet
    with 3 holes for the screws and a stamped shape with some contour to the
    outside.

    --Bob Steward A&P IA
    Birmingham, AL



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  4. #4

    wheel fairings

    I think these are called wheelwell fairings.

    Dan

    --- Ray Griffin <jrgriffin@telus.net> wrote:

    > Hi, Group,
    > Paul may mean the wing fairings on the C24R.
    > They are little" bumpouts" under the wing, around
    > the wheel wells.
    > Ray Griffin
    >
    > -----Original Message-----
    > From: musketeermail@yahoogroups.com
    > [mailto:musketeermail@yahoogroups.com]On Behalf Of
    > n76lima@mindspring.com
    > Sent: Thursday, September 01, 2005 10:46 AM
    > To: musketeermail@yahoogroups.com
    > Subject: Re: [musketeermail] wheel fairings
    >
    >
    > >I have a friend that wants to buy a set of wheel
    > fairings as on the C24Rs.
    > They are to be used on an experimental >retract. Any
    > body out there have
    > some or know of a good source? Paul
    >
    > Huh? C24R is a retract (Sierra) and has no "wheel
    > fairings". (Not that I
    > have ever seen any wheel fairings on any Musketeer
    > series plane, but
    > certainly not on a Sierra.) Could you mean the "hub
    > caps" that cover the
    > axle nut? LoPresti has their "Hubba-Hubba Caps" for
    > standard Cleveland 6"
    > wheels. Wag Aero and Aircraft Spruce sell 6" wheel
    > covers, both flat sheet
    > with 3 holes for the screws and a stamped shape with
    > some contour to the
    > outside.
    >
    > --Bob Steward A&P IA
    > Birmingham, AL
    >
    >
    >
    > Join BAC today and be a part of the ONLY Type Club
    > for the Musketeer series!
    >
    > www.beechaeroclub.org
    >
    >
    > Yahoo! Groups Links
    >
    >
    >
    >
    >
    >
    >
    >
    >
    >
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    >
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    >
    >
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    > for the Musketeer series!
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    >




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  5. #5

    wheel fairings

    --- "Mike Rellihan" wrote:
    > ...
    > The Beech leading fairing does not have the ideal front shape; it
    > is too blunt.

    Given my presumption that aeronautical engineers were involved in the
    design, any thoughts as to why would such a design decision be made?

    > The aft fairing should be tapered aft as far as is practical.
    > The Beech main gear aft fairing is actually only about 2/3s as long
    > as it should be, ...

    This, I presume, was done to save weight.

    > ... and is too abrupt where the flange is formed on the trailing
    > edge.

    Where was the aeronautical thinking in this decision?

    > The overlapped fairings that were made for the flap brackets,
    > during the experimentation by the Sierra engineering group, went
    > almost to the trailing edge of the wing.

    Flap hinge fairings are part of the bread and butter of Piper speed
    mods. Again, a small weight penalty situation. Did they not find
    them of sufficient performance/weight/cost benefit?

    > An experimental aft fairing that I made for the retracted nose gear
    > wound up a tad too wide for the wheel, and wasn't long enough. I
    > was unable to tell any effect at all during its testing (meaning
    > back to the drawing board).

    I have wondered about this type of nose gear fairing myself,
    especially when I see the pictures of the tire dragging through the
    air!!! Did you give up on it, or will you have another try?

    Thanks for the info Mike! I have really been impressed with the
    attention to detail that Beech gave to the structure, so these
    apparent aerodynamic oversights are surprising.

    Fortunately, that BIG rear door is a major part of the reason that I
    own a C24R and the RG is a plus on top of that, but, you'd think they
    would have gone a bit further to maximize its efficiency.

    By the by, the Piper owner forums often have surviving design team
    members come and speak at their national meetings to talk about the
    why of the early design decisions. Has such a thing ever happened at
    a meeting of the Mice?

    Gerald




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  6. #6

    wheel fairings

    The factory parts and designs on generic (as opposed to custom) market planes have to be compromised for cost and attachment reasons (just like on a Ford versus a Ferrari). An external flange is the least expensive design and the easiest to install; but it forces a different shape at the leading and trailing edges, puts uneven surfaces in the airstream, and takes up room that could be used instead for a more flowing design.

    When the engineering group worked through the project to clean up drag on the Sierra, very few of their findings provided a benefit that outweighed the costs. This was bad news at the time, since the Sierra was already priced much higher than its 200HP retract competition. Only small changes, such as the reduced aileron under-wing skin gaps (as opposed to true gap seals), oval-section step supports, and the gascolator fairing, actually made it into production.

    Here is a partial list of things that they tried, that I know of and can recall at the moment; there may have been more. I have photos of some of these, that I hope to get up on the BAC website someday:
    1. Flushed filler necks and caps.
    2. Flushed wingtip mountings.
    3. Flushed taxi light lens mountings.
    4. Full-coverage main gear strut and wheel doors.
    5. Full-coverage nose gear doors.
    6. Frog-lipped induction air inlet.
    7. Re-shaped engine cowling with cowl flaps.
    8. Stabilator gap brush seals.

    They also tried out the installation of a Continental Tiara six-cylinder engine; I think it was 260HP as used in the Sierra application, though other versions were made through most of the 1970s (used in very limited applications). I don't think that the Tiaras ever made it beyond a TBO assignment of only 1,200 hours.

    I have heard that there have been Beech speakers at the Wichita fly-ins, but I have not made it there yet. I haven't given up on the nose wheel fairing. I do think it would be far more effective if I could come up with a safe way to fair the axle strut too. Just haven't had time to pursue it further.

    ----- Original Message -----
    From: g_v_jackson
    To: musketeermail@yahoogroups.com
    Sent: Friday, September 02, 2005 3:27 PM
    Subject: [musketeermail] Re: wheel fairings


    --- "Mike Rellihan" wrote:
    > ...
    > The Beech leading fairing does not have the ideal front shape; it
    > is too blunt.

    Given my presumption that aeronautical engineers were involved in the
    design, any thoughts as to why would such a design decision be made?

    > The aft fairing should be tapered aft as far as is practical.
    > The Beech main gear aft fairing is actually only about 2/3s as long
    > as it should be, ...

    This, I presume, was done to save weight.

    > ... and is too abrupt where the flange is formed on the trailing
    > edge.

    Where was the aeronautical thinking in this decision?

    > The overlapped fairings that were made for the flap brackets,
    > during the experimentation by the Sierra engineering group, went
    > almost to the trailing edge of the wing.

    Flap hinge fairings are part of the bread and butter of Piper speed
    mods. Again, a small weight penalty situation. Did they not find
    them of sufficient performance/weight/cost benefit?

    > An experimental aft fairing that I made for the retracted nose gear
    > wound up a tad too wide for the wheel, and wasn't long enough. I
    > was unable to tell any effect at all during its testing (meaning
    > back to the drawing board).

    I have wondered about this type of nose gear fairing myself,
    especially when I see the pictures of the tire dragging through the
    air!!! Did you give up on it, or will you have another try?

    Thanks for the info Mike! I have really been impressed with the
    attention to detail that Beech gave to the structure, so these
    apparent aerodynamic oversights are surprising.

    Fortunately, that BIG rear door is a major part of the reason that I
    own a C24R and the RG is a plus on top of that, but, you'd think they
    would have gone a bit further to maximize its efficiency.

    By the by, the Piper owner forums often have surviving design team
    members come and speak at their national meetings to talk about the
    why of the early design decisions. Has such a thing ever happened at
    a meeting of the Mice?

    Gerald




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