(05/01/99) I
purchased the Holverson Designs' Zoomie from Apogee Components with an
order of motors. It is my first boost-glider.Zoomie is 6" long with a little over an 8" wing
span and flies on mini (13mm) motors. It is a boost glider because it ejects a
portion of the rocket while the remaining portion glides to earth. In the
Zoomie's case, it ejects the motor casing.
CONSTRUCTION:
The kit includes an 11x17 instruction sheet printed on
both sides, a laser-cut balsa sheet with the four wing pieces, a 2" long
body tube, a 2" long launch lug, a short, balsa nose cone, and a small
piece of clay.
The instructions were very clear and thoroughly
illustrated. I really want to emphasize that. In fact, Holverson comments,
"This instruction sheet is laid out to allow you to start a rocket plans
reference file. Save your entire set of instructions for future
reference." The instructions cover building, finishing, trimming and
flying of the Zoomie. They also tell a little bit about boost gliders as
defined by NAR.
Assemby is very easy but takes a little time to ensure
the wings are built properly. During assembly of the wings a small square is
good to have to ensure the wing tip is at a 90° angle. The instructions
are very good here indicating the need for pins to hold while drying.
I have read about a glue technique that was used for the
build of the Zoomie, however, this was the first time I used it. That is
a double-glue technique. First the edges that are going to be glued together
get a light coat of white glue and then are allowed to dry. Then they are
coated again and assembled. It is to "increase the strength of the
joint." according to the instructions.
The only part that I had some difficulty on was the
sanding the joint of the wings. With the wing tips assembled, each wing looks
like a "L". With both wings laying on the table as they would be
assembled, the joint is to be sanded to allow them to adjoin flushly. This is
done by sanding until it is perpendicular to the table. Doesn't sound hard but
I had some trouble and had to take several shots at it. Only advice I have is
to go slow.
I didn't really "finish" the Zoomie
although the instructions gave good information for sanding, sealing and
painting. I hit mine with some fluorescent green paint. It really made it very
visible.
Overall, for CONSTRUCTION I would rate this kit
4
points. It is easy to build on its own, however, with excellent
instructions . . . it's a snap.
FLIGHT/RECOVERY:
I practiced on three separate occasions trimming the
Zoomie in the back yard and did as the instructions said. Then one day I
went to the field for the flights. I tossed it there and found that I had to
trim again . . . removing most of the clay I added to the wing tips. So again,
the instructions hinted at this by saying "Balsa gliders are tempermental
about holding their trim over changes in the climate."
I popped in a 1/2A3-4
and took a picture and let her go. After a slight spiral in the climb, she
arced over and "pop" ejected the motor. The motor casing hit the
ground right near me as the Zoomie took a steep dive toward the earth.
According to the instructions, this indicated that I needed additional weight
in the rear.
I added the weight and flew the Zoomie three more
times on 1/2A3's. Each time I determined to add a bit more clay to the rear of
the wings and each time the glide got better.
The 5th flight was on an A10-3. The climb was several
large spirals. It was way up there. I heard the "pop" but never saw a
the motor or the glider again.
Holverson recommends 1/2A3's and A3's
For FLIGHT/RECOVERY, I would rate this kit
3
points. I have watched other larger gliders at launches and they
can really glide. This little bird didn't compare, however, it does
provide a good way to get into gliding and was fun. If I were to build another,
I would never fly in on anything bigger than 1/2A's though. It's just too small
and goes out of sight.
This was my first glider. I had fun with it, but I
believe that I needed the flight tests to trim it. It seemed to act differently
in the air than me toss-testing it. I highly doubt this could win any duration
events, even after extensive trimming, but it was easy to build and fun to fly.
I give the kit an OVERALL rating of
3
1/2 points.