These indoor kite posts once appeared in the site blog page - that's the
one you enter via the 'what's new!' site navigation link. The latest posts come first. Just scroll
down and stop at any heading that appeals :-)
MBK Indoor Canard Kite
It's done - the final Indoor Canard, complete with black border and aqua-blue stripes, has flown...
out to the veranda for the 'in-flight' photo has yet to be done. Being
an open space, flying under our veranda is weather-dependent though.
MBK Indoor Canard
In the meantime, the kite has proved itself indoors. The usual living-room capers!
build differed only slightly in a few dimensions from the previous
prototype. However, the towing point position was affected somewhat. The
feather-light kite sat right back but refused to climb on the first
couple of attempts to launch. So, the towing point was shifted 1cm
(3/8") forward before the next flight. That amount seemed just right
since the clear-plastic and paper craft headed straight for the ceiling.
error in cutting out the sail for the previous prototype had meant some
extra sticky tape was used on the upper sail. This had to be balanced
out by several strips of tape along the trailing edge of the lower sail.
More weight! So the next build was lighter for 2 reasons - no
unnecessary tape plus those spar-width shavings here and there. There
were no changes to the plan-form or spacing of the upper and lower
A few duration flights over my standard distance confirmed
that the new kite was flying slower than the old one. Good! The slower
the better for indoors.
A few whisks around the house on a short line
also confirmed that 6kph was safe. Nothing failed :-) On the test the
speed actually peaked at 6.3kph. Oh, in case you're wondering - my
towing hand was also holding an anemometer...
On this site, there's more kite-making info than you can poke a stick at :-) Want to know the most convenient way of using it all?
The Big MBK E-book Bundle is a collection of downloads - printable PDF files which provide step-by-step instructions for many kites large and small.
Every kite in every MBK series.
Canard #2 Modified
In poor weather, it's great being able to test a change without leaving the house...
Looking at prototype #2 of the MBK Indoor Canard just sitting there on my desktop, it struck me that there was another way to trim off some weight. By removing a section of the vertical spar, the kite would be significantly lighter and stronger. Specifically, there would be less tendency for the vertical spar to bend at the towing point, as the upper and lower sails took the strain of flight.
So, stronger, lighter - why not? Well, there would also be a reduction in directional stability since the overall aspect ratio of the design would increase. That's OK for a whopping great outdoor kite, but this was a tiny indoor design...
With some trepidation, I flew the altered kite around the house. And indeed, at it's slowest possible flying speed, the little canard did struggle to stay straight. There was more than a little bobbing to the left and right when flying at a low line angle.
However, with just a kph or 2 extra towing speed, all was well and the kite followed me around with the nose swinging left or right to follow any changes in towing direction. Line angles were close to 45 degrees.
On a bit more thread, the nose dragged lightly across the ceiling in a most satisfying manner :-)
And as the 'icing on the cake', a final duration test came out at around 8.5 seconds. So close to the magic 9 seconds now.
The planned changes for slimming down the various pieces of the frame will still be done on the next build. It's less risky now that the vertical spar is shorter and lighter...
Canard #2 Does Better
Prototype #2 flew around the house this afternoon, not caring about the constant rain and wind outside...
Firstly, a few duration flights were done to check the effect of all the weight-trimming. I had ended up being a little more cautious than first planned, not wanting to create an overly weakened kite. Sure enough, the kite still didn't want to stay up any more than about 8 seconds. 9 seconds is the mark to hit. How slow can you go.
Although still a touch weighty, the flying characteristics of the flimsy canard were simply great. Just like the Indoor Delta, this canard follows you around on a short line. Pointing like a weather-cock, through every turn. A tendency to nose over into a shallow dive was corrected with some sticky tape along the rear trailing edge. *Gasp* tail-weight! Tsk tsk.
After enjoying some general flying, with the occasional nose-stab into the living-room light fitting ('tok!') it was time to check out structural strength at high speed. That's right, stressing the kite right out by exceeding the 6kph red-line :-) By holding the wind-meter in the same hand that gripped the thread, I was eventually able to get a gust strength reading of 6.1kph, around the living-room. No damage was apparent by looking at the kite, but just to be sure I flew it around a bit more. All seemed ok, with no undue bending or buckling.
So a bit more dieting will be necessary to get the little Indoor Canard floating about at the leisurely walking pace required. By shaving off a mm here, a mm there...
Canard Lumbers Aloft
Prototype #1 is on the heavy side, you see...
Yesterday evening I completed the first build of the Indoor Canard. In case you're not aware, a canard craft has a small wing at the front and the main lifting surface at the rear...
The first prototype of anything at MBK is usually too heavy. This gives an opportunity to at least see the kite fly with no structural failure. Then it's just a matter of deciding how much weight to shave off, and where, for the next build.
Flying the canard - my first ever - was a pleasant surprise. After shifting the towing point rearwards in 3 steps, the kite finally rose up and flew beautifully stable. The duration test revealed how overweight it was however. The kite could only manage 6 or 7 seconds in the air over the standard short course which requires 9 seconds for a 'pass'.
After a little thought, the towing point was moved back yet another centimeter and some sticky-tape tail-weight was added to the rear trailing edge. These changes resulted in durations around 7 to 7 1/2 seconds. Better, but still not enough!
So, except for the skinny little battens along each squared-off wing-tip, every spar piece will be remade a few mm slimmer. The critical test will be to see if the slimmed-down version survives the 6kph red-line tow :-) If not, 1 mm will be added back in to the relevant spar(s).
The story or stories above document actual flying experiences.
My write-ups are definitely warts-and-all since things don't always go totally as planned. However, half the fun of kiting is anticipating the perfect flight. When it happens, it's magic!
As mentioned earlier, there's more kite-making info here than you can poke a stick at :-)
Want to know the most convenient way of using it all?
The Big MBK E-book Bundle is a collection of downloads - printable PDF files which provide step-by-step instructions for many kites large and small...
Every kite in every MBK series.