basic spar construction

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 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