MBK 2-Skewer Box
Nice stiff winds were also forecast with a cold front edging closer overnight.
As weather conditions started to clear, we decided to get out and
fly just before lunch, down at the Wilfred Taylor reserve. Pulling up
at the reserve, I was disappointed to see barely any movement in the
nearby trees. However, fresh gusts were coming through from time to time.
I rigged the 2 Skewer Box Kite in just over 2 minutes, including
attaching the flying line.
Soon the kite was in the air, with my wife
May snapping off photos and taking some video too, for this web page.
With all the cloud around, it wasn't hard to check the wind speed
higher up. The clouds, which were much higher now, were scudding across
from the West fairly slowly. Even so, I guessed there was at least 15
knots up there. All we had to do was to get the kite up high enough to
contact that air. I mentioned Wind Gradient in the title up
there. That just refers to how the wind speed increases as you go from
ground level up to several hundred feet in the air.
On a day like today, there was sure to be a moderate wind gradient.
It was clear that hand launching would be an exercise in
frustration, since the box kite dropped like a stone during every lull.
So, I just walked out about 30 or 40 meters with the kite in hand,
pulling line off the winder which was just lying on the grass. Back at
the winder end again, it was a simple matter to wait for a gust, then
climb the kite up above 50 feet or so.
The 2 Skewer Box Kite launches from the ground quite easily. Although it lifts off sideways, the lower cell soon swings back downwind and the kite is ready to climb out. From 50 feet, the wind really started to bite, and I almost got line-burn a couple of times while I let the line fly off the winder!
Aren takes the strain
In no time at all, I had let almost all 150 meters of line out as
the kite cavorted around, close in position to the bright morning sun.
Our 3-year-old held on for dear life for a while - see the photo! The kite seemed to sit around 40 to 50 degrees from the
horizontal most of the time.
Despite the cool air temperature, patches of sinking and rising air
affected the box kite from time to time. Sinking air would keep it down
around 30 degrees or so, pulling like a horse. The lifting air, on one
occasion, boosted the 2 Skewer Box Kite right up to around 60 degrees.
The kite seemed comfortable and stable, so I didn't worry about
it floating high up over a section of the reserve which was covered with
trees. However, after nearly an hour in the air, something did go
The kite started to fly low, but still seemed stable. After
winding it in a lot closer, it was clear that something was wrong with
the lower cell. The vertical cross-piece had slipped out, I have no idea
how. That wasn't supposed to happen, since I had glued little lengths
of bamboo to the main spars to hold the cross pieces securely in place.
Perhaps a spar had rotated a little, letting the cross-piece slip
past. Maybe the loads on the kite had pulled the 2 main spars apart far
enough to let the cross-piece drop out.
Whatever happened, once one
cross-piece goes, it's only a matter of time until they all drop out!
Hence, by the time I got the kite back on the ground, only 1 cross-piece
was still on the kite - and it was about to drop out too. Incredibly,
the kite was still flyable, although with much reduced performance!
Bottom line is this - the 2 Skewer Box Kite is a fantastic traditional-style box kite in terms of flying performance, but still
needs some refinement to keep those pesky cross-pieces in place! It's
looking more and more like I might just tape or glue them in place, like
every other 2-skewer kite in the MBK series. The kite will still be
portable enough to provide a lot of fun.