Intake on nose fairing
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Any nose fairing experts please chime in:
Here in Florida, where the seasons change from hot and
wet to hotter and wetter, cooling is to use the
vernacular - huge.
I'm working on a nose cone/body sock combo for my shock
proof. I want to smoothly expand the 25+ MPH air to a 10 MPH
flow inside the fairing.
What I am going to try is to cut a 10" hole in the front of
the fairing, and insert a nose cone which tapers at its back
end. This will give the fairing a rather "Mig 21" look. The
effect will be to create a "ring venturi" that expands and
slows the airflow down. This should also raise the interior
pressure, which is good, since I plan on having foot holes
in it (the shock proof's bracket is a little low).
--
Robert Haston Satellite Beach, FL
Robert Haston wrote:
> Any nose fairing experts please chime in:
>
> Here in Florida, where the seasons change from hot and
> wet to hotter and wetter, cooling is to use the
> vernacular - huge.
>
> I'm working on a nose cone/body sock combo for my shock
> proof. I want to smoothly expand the 25+ MPH air to a 10
> MPH flow inside the fairing.
>
> What I am going to try is to cut a 10" hole in the front
> of the fairing, and insert a nose cone which tapers at its
> back end. This will give the fairing a rather "Mig 21"
> look. The effect will be to create a "ring venturi" that
> expands and slows the airflow down. This should also raise
> the interior pressure, which is good, since I plan on
> having foot holes in it (the shock proof's bracket is a
> little low).
Two words: NACA duct.
<http://home.hiwaay.net/~langford/nacaducts/NACA_duct.jpg> (http://home.hiwaay.net/~langford/nacaducts/NACA_duct.jpg).
--
Tom Sherman – Quad City Area
Thanks. I was looking for a good profile of one.
"Tom Sherman" <tsherman@qconline.com> wrote in message news:2kmjlsF476naU2@uni-
berlin.de...
> Robert Haston wrote:
>
> > Any nose fairing experts please chime in:
> >
> > Here in Florida, where the seasons change from hot and
> > wet to hotter and wetter, cooling is to use the
> > vernacular - huge.
> >
> > I'm working on a nose cone/body sock combo for my shock
> > proof. I want
to
> > smoothly expand the 25+ MPH air to a 10 MPH flow inside
> > the fairing.
> >
> > What I am going to try is to cut a 10" hole in the front
> > of the
fairing,
> > and insert a nose cone which tapers at its back end.
> > This will give the fairing a rather "Mig 21" look. The
> > effect will be to create a "ring venturi" that expands
> > and slows the airflow down. This should also
raise
> > the interior pressure, which is good, since I plan on
> > having foot holes
in
> > it (the shock proof's bracket is a little low).
>
> Two words: NACA duct. <http://home.hiwaay.net/~langford/n-
> acaducts/NACA_duct.jpg>.
>
> --
> Tom Sherman – Quad City Area
"Robert Haston" <rehaston@earthlink.net> wrote in message news:<_AmFc.5574$yy1.830@newsread2.news.atl.earthlink.net>...
> Any nose fairing experts please chime in:
>
> Here in Florida, where the seasons change from hot and
> wet to hotter and wetter, cooling is to use the
> vernacular - huge.
>
> I'm working on a nose cone/body sock combo for my shock
> proof. I want to smoothly expand the 25+ MPH air to a 10
> MPH flow inside the fairing.
>
Around here, the Easy Racer riders are sewing in longer
zippers on the tops of their body socks. When the going is
slower and/or hotter, they unzip the top and open it up,
allowing bottom-to-top ventilation.
Cutting a whopping big hole in the front of your fairing
seems counterproductive. How about a big scoop that you can
close off if needed? You could make the front of your
fairing look something like an F-8 Crusader: http://www.air-navy.com/xf8u-
1.htm Jeff
Actually, the hole would be a ring an inch or two thick, and
ten inches or so in diameter, rather like a big propeller
spinner, with a thin intake around it.
The general idea is to get a low velocity high pressure flow
inside the nose for cooling and to increase the pressure so
it doesn't suck air in the foot holes.
"Jeff Wills" <jwills@pacifier.com> wrote in message
news:a13b2743.0407031957.23be97e8@posting.google.com...
> "Robert Haston" <rehaston@earthlink.net> wrote in message
news:<_AmFc.5574$yy1.830@newsread2.news.atl.earthlink.net>.-
..
> > Any nose fairing experts please chime in:
> >
> > Here in Florida, where the seasons change from hot and
> > wet to hotter and wetter, cooling is to use the
> > vernacular - huge.
> >
> > I'm working on a nose cone/body sock combo for my shock
> > proof. I want
to
> > smoothly expand the 25+ MPH air to a 10 MPH flow inside
> > the fairing.
> >
>
> Around here, the Easy Racer riders are sewing in longer
> zippers on the tops of their body socks. When the going is
> slower and/or hotter, they unzip the top and open it up,
> allowing bottom-to-top ventilation.
>
> Cutting a whopping big hole in the front of your fairing
> seems counterproductive. How about a big scoop that you
> can close off if needed? You could make the front of your
> fairing look something like an F-8 Crusader: http://www.air-navy.com/xf8u-
> 1.htm Jeff
"Robert Haston" <rehaston@earthlink.net> wrote in message news:<zedGc.2495$sD4.235@newsread3.news.atl.earthlink.net>...
> Actually, the hole would be a ring an inch or two thick,
> and ten inches or so in diameter, rather like a big
> propeller spinner, with a thin intake around it.
>
> The general idea is to get a low velocity high pressure
> flow inside the nose for cooling and to increase the
> pressure so it doesn't suck air in the foot holes.
>
I think you'd be better off poking an appropriate size hole
right at the nose, where the airspeed is already slowest,
rather than trying to pull in faster-moving air and then
slowing it down.
Jeff
You are right. The real thing my research told me is that
this air would just flow out the leg holes anyway. It seems
the trick is to keep the nose narrow and have the widest
point as far aft as possible.
"Jeff Wills" <jwills@pacifier.com> wrote in message
news:a13b2743.0407051115.2ab46597@posting.google.com...
> "Robert Haston" <rehaston@earthlink.net> wrote in message
news:<zedGc.2495$sD4.235@newsread3.news.atl.earthlink.net>.-
..
> > Actually, the hole would be a ring an inch or two thick,
> > and ten inches
or
> > so in diameter, rather like a big propeller spinner,
> > with a thin intake around it.
> >
> > The general idea is to get a low velocity high pressure
> > flow inside the
nose
> > for cooling and to increase the pressure so it doesn't
> > suck air in the
foot
> > holes.
> >
>
> I think you'd be better off poking an appropriate size
> hole right at the nose, where the airspeed is already
> slowest, rather than trying to pull in faster-moving air
> and then slowing it down.
>
> Jeff
"Robert Haston" <rehaston@earthlink.net> wrote in message news:<RRIGc.10625$yy1.694@newsread2.news.atl.earthlink.net>...
> You are right. The real thing my research told me is that
> this air would just flow out the leg holes anyway. It
> seems the trick is to keep the nose narrow and have the
> widest point as far aft as possible.
>
Well, of course I'm right. ;-)
Yeah, designing a full fairing for an HPV is a b***h.
The most powerful motors are trained to spin
conventional cranks, so the foot-and-crank volume ends
up determining the major volume of the fairing. Unless
you want to go head-first (Slovenian style:ecumbents.com/wisil/whpsc2003/images/ArneHodalic/WHPSC-
2003-Hodalic.htm ) you end up with something with a
huge schnozz.
I do want to build a faired lowracer with a hard nose and
fabric sides and tail. That's about project #4,782...
Jeff
>Well, of course I'm right. ;-)
>
>Yeah, designing a full fairing for an HPV is a b***h. The
>most powerful motors are trained to spin conventional
>cranks, so the foot-and-crank volume ends up determining
>the major volume of the fairing.
Mark Mueller has a GTX fully faired with 110mm cranks that
allowed a much smaller nose cone.. At the spring HPV event
in San Jose California, he was able to finish with a speed
of about 33. He probably has some info on his website.
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