basic spar construction

Can anyone suggest some home built construction sites where they show the
process of building a spar for a foam composite wing. I'm confused on how a
spar is built for a foam wing. It doesn't seem like the foam itself would
provide enough structure to provide a web. It would seem like you'd have
to cut the wing foil, cut out the location of the spar, build the spar, and
then reinstert that section back into the foam wing.

Thanks,
Dave

The SkyPup ultralight uses foam spar webs and ribs with
wood for the spar caps and rib caps. There are many pictures
on this website, some will show detials of the spars/wings during
construction.

http://www.skypup.net/index2.htm

For the SKyPup, fisrt the spar is made. The foam ribs are
made in two pieces one fore and one aft of the spar, then
butt glued in to the spar web. Then the rib caps are glued on.

The spar caps carry all the compressive and tensile stress due
to bending of the spar as the wing is loaded. The web only carries
shear due to bending and that is quite small.

Clearly not the only way to do it, nor necessarily the easiest
for every builder.

If you are not familiar with beams, it can be very helpful to
study up on beams, especially I-beams and box-beams as
wing spars are essentially beams.

--

FF

thanks!

wrote in message
oups.com...
The SkyPup ultralight uses foam spar webs and ribs with
wood for the spar caps and rib caps. There are many pictures
on this website, some will show detials of the spars/wings during
construction.

http://www.skypup.net/index2.htm

For the SKyPup, fisrt the spar is made. The foam ribs are
made in two pieces one fore and one aft of the spar, then
butt glued in to the spar web. Then the rib caps are glued on.

The spar caps carry all the compressive and tensile stress due
to bending of the spar as the wing is loaded. The web only carries
shear due to bending and that is quite small.

Clearly not the only way to do it, nor necessarily the easiest
for every builder.

If you are not familiar with beams, it can be very helpful to
study up on beams, especially I-beams and box-beams as
wing spars are essentially beams.

--

FF

On the SkyPup site the photos are groups by owner in the 'Kennels'
section. It will take a lot os searchign to find one with construction
details.


Good pictures of the wings and spars are also he

http://www2.wcoil.com/~rford/

The show the spar and rib construction quite well.

The Sky Pup is made of foam, wood and fabric so it is a composite
aircraft. Most of the time when refering to composite aricraft the
speaker
means fiberglass, kevlar or carbon fiber.

Conceptually, those other materials can be substituted for the wood
in a SKyPup-like design, though ther result might not necessarily have
a better strenght to weight ratio. The wood in the SKy Pup is used
very
efficiently.

--

FF

Thanks. I finally found the same site after some searching. Pretty neat
little ultralight!

Is there any way to calculate wing loads on something like the following
(this is where I'm going). Do you think the skypup construction could
handle these loads:

http://groups.msn.com/LandsailerandI...ndconstruction

Thanks again for your help

wrote in message
oups.com...
On the SkyPup site the photos are groups by owner in the 'Kennels'
section. It will take a lot os searchign to find one with construction
details.


Good pictures of the wings and spars are also he

http://www2.wcoil.com/~rford/

The show the spar and rib construction quite well.

The Sky Pup is made of foam, wood and fabric so it is a composite
aircraft. Most of the time when refering to composite aricraft the
speaker
means fiberglass, kevlar or carbon fiber.

Conceptually, those other materials can be substituted for the wood
in a SKyPup-like design, though ther result might not necessarily have
a better strenght to weight ratio. The wood in the SKy Pup is used
very
efficiently.

--

FF

Dave:
Take a look at the ruttan wings on a q-1 or q2 it will fit the bill for
what you want. There is one site on the web for free downloads of the q2
info but I do not have the URL at hand. Q1 plan can be had on C.D. for less
than $10 via EBay.

"Dave Schneider" wrote in message
...
Can anyone suggest some home built construction sites where they show the
process of building a spar for a foam composite wing. I'm confused on how
a
spar is built for a foam wing. It doesn't seem like the foam itself
would
provide enough structure to provide a web. It would seem like you'd have
to cut the wing foil, cut out the location of the spar, build the spar,
and
then reinstert that section back into the foam wing.

Thanks,
Dave

after a bit of surfing i found this. Is something like this what you are
talking about?

http://www.hinkleymall.com/airplane_cd.html

There is also this on ebay:

http://cgi.ebay.com/ebaymotors/ws/eB...0814 564&rd=1


Basic question for the Quickie, do the wings disassemble? I'm also looking
for techniques for attaching wings.

Thanks!
Dave

"James R. Freeman" wrote in message
...
Dave:
Take a look at the ruttan wings on a q-1 or q2 it will fit the bill
for
what you want. There is one site on the web for free downloads of the q2
info but I do not have the URL at hand. Q1 plan can be had on C.D. for
less
than $10 via EBay.

"Dave Schneider" wrote in message
...
Can anyone suggest some home built construction sites where they show
the
process of building a spar for a foam composite wing. I'm confused on
how
a
spar is built for a foam wing. It doesn't seem like the foam itself
would
provide enough structure to provide a web. It would seem like you'd
have
to cut the wing foil, cut out the location of the spar, build the spar,
and
then reinstert that section back into the foam wing.

Thanks,
Dave

Dave Schneider on Dec 8, 2:05 pm wrote:


Is there any way to calculate wing loads on something like the
following
(this is where I'm going).

Of course.

The first step is to model or at least establish an upper bound to the
forces acting on it. That may be more complicated for an iceboat
than for an airplane.


Do you think the skypup construction could
handle these loads:

http://groups.msn.com/LandsailerandI...ndconstruction


Possibly. The iceboat wing may see more substantial torsional
loads than the SkyPup Wing. In general box beams are, in regard
to strength to weight ratio, very efficient for handling torsional
loads.

The SkyPup spars are more like an I-beam than a box beam.

The SkyPup, being an ultralight was designed to minimize torsional
loading on the wings to permit the use of a single spar and keep
them light as well as keeping the construction simple.

Some aircraft use two spars per wing with x-bracing between them
to handle torsional loads. Some use box beam spars. Monocoque
construction which relies on distributing the stress on the skin rather

than carrying it all on internal structure essentially turns an entire
wing into a box beam.

--

FF

Thank you for taking the time to answer my kind of off topic (non-airplane)
questions! I'm looking into the Quickie wing construction right now.

wrote in message
oups.com...
Dave Schneider on Dec 8, 2:05 pm wrote:


Is there any way to calculate wing loads on something like the
following
(this is where I'm going).

Of course.

The first step is to model or at least establish an upper bound to the
forces acting on it. That may be more complicated for an iceboat
than for an airplane.


Do you think the skypup construction could
handle these loads:

http://groups.msn.com/LandsailerandI...ndconstruction


Possibly. The iceboat wing may see more substantial torsional
loads than the SkyPup Wing. In general box beams are, in regard
to strength to weight ratio, very efficient for handling torsional
loads.

The SkyPup spars are more like an I-beam than a box beam.

The SkyPup, being an ultralight was designed to minimize torsional
loading on the wings to permit the use of a single spar and keep
them light as well as keeping the construction simple.

Some aircraft use two spars per wing with x-bracing between them
to handle torsional loads. Some use box beam spars. Monocoque
construction which relies on distributing the stress on the skin rather

than carrying it all on internal structure essentially turns an entire
wing into a box beam.

--

FF

Dave:
I found the URL. It is:

http://www.finleyweb.net/default.asp?id=141

Jim

"Dave Schneider" wrote in message
...
after a bit of surfing i found this. Is something like this what you are
talking about?

http://www.hinkleymall.com/airplane_cd.html

There is also this on ebay:


http://cgi.ebay.com/ebaymotors/ws/eB...ory=26441&item
=4510814564&rd=1


Basic question for the Quickie, do the wings disassemble? I'm also
looking
for techniques for attaching wings.

Thanks!
Dave

"James R. Freeman" wrote in message
...
Dave:
Take a look at the ruttan wings on a q-1 or q2 it will fit the bill
for
what you want. There is one site on the web for free downloads of the q2
info but I do not have the URL at hand. Q1 plan can be had on C.D. for
less
than $10 via EBay.

"Dave Schneider" wrote in message
...
Can anyone suggest some home built construction sites where they show
the
process of building a spar for a foam composite wing. I'm confused on
how
a
spar is built for a foam wing. It doesn't seem like the foam itself
would
provide enough structure to provide a web. It would seem like you'd
have
to cut the wing foil, cut out the location of the spar, build the
spar,
and
then reinstert that section back into the foam wing.

Thanks,
Dave