Today, the team met in the morning
to divide up tasks to be accomplished by the end of
day. Mike Lavara, an engineer and our future RC pilot,
spoke with each working group to help brainstorm ideas and give suggestions
and tips. A couple people went on a trip to the local
hobby shops to purchase supplies
for the team. A few people worked on mounting servos in the wing, while others
worked on designing a way to rotate the wingtips to control twist. Others worked
on designing and building a boom and tail and a method of attaching the two.
The membrane team continued to work with rip-stop polyester, trying to play
with the curvature of the outer wingtips. Later in the
afternoon, John Rubin from
National Geographic came to interview the team and look around at what was
being worked on.
On Membrane Design
Today we built the new wing with a spar attached
to the body and a wing with chamber and some reflex. It flew ok but the small
mistakes on the small wing
ended up being a problem and made the wing unstable. But with the chamber,
it had a forward pitching moment which let us get rid of the nose weights.
decided that we will make two identical bodies one with a fixed main spar,
one loose, and have adjustable tensioning systems for the from and back.
continue with the 3’ model for a day or so and then move on to a 6’ model
with servos the control the tension.
In the morning, various groups spoke with RC expert Mike
Luvara regarding various aspects of the pterosaur design. Among the items
discussed were wire routing
for the servos mounted in the foam wing and methods of lifting/lowering the
head. The tail group continue work on the vertical stabalizer which was ready
and be mounted to a spar which would connect to the back of the pterosaur.
Julia worked on the horizontal tail making it so that the two individual
would move simultaneously in exactly the same direction. Later into the morning
PJ, Clark, Nicki, Jeff, and Pey-Jin took a trip down to Sheldon's Hobby Shop
in San Jose. This was the first trip to this particular shop and proved a
very successfuly expedition. There the group found lighter competition balsa
for the elevons, servo wire, connectors, and crimping equipment for making
the servo extensions into the wing, a more powerful servo for the head actuation,
rods for various parts including tail mounting, and monokote for the tail.
the hobby shopy trip, Marianne was busy hollowing out the pterosaur's final
foam body. Also during the hobby trip Marianne, Ben, Axel, Jessa, Julia,
were flying the 1M balsa pterosaur model from the balcony outside our building.
This group was looking at stability of the 1M model. The trip took this group
of students until 3:30PM and by this time the day was pratically over.
Though Thursday, the 29th of July, was a day of few people (only
five team members came in), it was a very productive day. After Arthur made
the regular morning
plan with the team, every team member went straight to work. The membrane
team started designing the 3-foot membrane and shaped a piece of aluminum tubing
to fit the membrane. The plan was to make two three-foot wingspans with two
The only difference would be that one of the spars would be flat, while one
spar would be loose. The other members who were here that day went to work
vertical tail, and by then end of the day had finished it.