Clearly Outside the Box

Where is the door?

On Jul 20, 3:40*pm, bagmaker
wrote:
Where is the door?

--
bagmaker

Through the hole in center of the electric motor. It's like the old
science demonstration for getting a hard boiled egg into a soda
bottle. Throw in a small piece of burning paper to use up the oxygen
and reduce the internal pressure by enough to "thwump!" suck the egg
in. Getting out, well that's a different matter.

It is good to have new designs, but this one isn't a good idea or the
least bit practical. It takes a lot of energy and CARBON to make
molds for the polycarbonate fuselage. So far I do not know of any
facility who can make such a massive injection molded part. Maybe
scale this down to a toy and it will be available at Walmart for
$19.95. Competely ridiculous.

Discus 44 wrote:
It is good to have new designs, but this one isn't a good idea or the
least bit practical. It takes a lot of energy and CARBON to make
molds for the polycarbonate fuselage. So far I do not know of any
facility who can make such a massive injection molded part.

That would not seem necessary. Perhaps it could be blow or spun molded,
or built from several large pieces glued or welded together. More to the
point, I think, is the suitablity of the material in the first place:
without fiber reinforcement, I think it might be too heavy.

--
Eric Greenwell - Washington State, USA
* Change "netto" to "net" to email me directly

* Updated! "Transponders in Sailplanes" http://tinyurl.com/y739x4
* New Jan '08 - sections on Mode S, TPAS, ADS-B, Flarm, more

* "A Guide to Self-launching Sailplane Operation" at www.motorglider.org

On the UAV project I was involved in the finacier decided the time
frame and the cost was too great for the traditional mold-part
process. He got ahold of a friend in the polycarbonate/stratch form
biz and was convinced this was the way to go.

$15,000 later we got floppy parts that were to heavy and impossible to
trim.

Brad


On Jul 21, 9:20*am, Eric Greenwell wrote:
Discus 44 wrote:
It is good to have new designs, but this one isn't a good idea or the
least bit practical. *It takes a lot of energy and CARBON to make
molds for the polycarbonate fuselage. *So far I do not know of any
facility who can make such a massive injection molded part.

That would not seem necessary. Perhaps it could be blow or spun molded,
or built from several large pieces glued or welded together. More to the
point, I think, is the suitablity of the material in the first place:
without fiber reinforcement, I think it might be too heavy.

--
Eric Greenwell - Washington State, USA
* Change "netto" to "net" to email me directly

* Updated! "Transponders in Sailplanes"http://tinyurl.com/y739x4
* * * New Jan '08 - sections on Mode S, TPAS, ADS-B, Flarm, more

* "A Guide to Self-launching Sailplane Operation" atwww.motorglider.org