The Dowel Delta Kite

Straight Line And Bent Spars!

Today we were hoping the Dowel Delta kite would not be prevented from flying, since the newsletter is going out soon! Rain had been forecast for this morning, and sure enough, there was a steady downpour during the early morning. However, around 10 o'clock the sky started to lighten up and the dead calm was replaced with the stirring of leaves on the trees and bushes around our home.

The very first Dowel Delta kite in flight.

This was a good chance to get out and do a much-needed 3rd session of test flying the new Delta! It's been a bit of a saga with the first 2 outings showing up some faults in the design.

We arrived at the Wilfred Taylor reserve, with light gusty winds moving the tree tops. The sky was still very cloudy, but clearing, with blue patches here and there. The big Dowel Delta kite was soon up. Those shoe-lace ties are great!

Shoe-laces are easy to work with and hold dowels securely in place.

Initially, the Delta got up top its old tricks, leaning to the left and even doing complete loops once in a while. Obviously I had still not removed enough wood to correct the uneven curvature in the horizontal spar. Oh well, that's easily taken care of later...

To correct the imbalance, I tried pushing the horizontal spar through the central tie a centimeter or so, as a temporary measure. This increased the sail area to the left of the vertical spar just a little. This worked - but only with a fair amount of wind speed past the kite. If the kite started leaning left, I found I could straighten it up by pulling in line and loading up the kite. Later, when the Delta was flying much higher, the wind was stronger at that altitude and the kite flew more or less straight without any input from me!

Another problem evident from earlier test flights was a tendency to 'porpoise' badly when the kite was near the top of its wind range. After some observation and thought, it became clear that the problem was the flexibility of the vertical spar. Just a slight upward bend of the nose would cause a sudden pitch-up. This would be followed by the dumping of lift, hence a nose-down movement again, as all the spars and sail distorted horribly.

Today, the kite was behaving much better in this regard since I had added a line from the nose to the towing point of the keel. Hence the vertical spar was now attached at 3 points and was very much stiffer in flight. Phew!

Did I mention that the horizontal spar actually snapped in 2 during the very first flying session several days ago? Hence the kite now sports a short reinforcer, glued beside the horizontal spar near the middle, to prevent it bending so much.

So, we eventually had the Dowel Delta kite up nice and high, with just over 90 meters of line let out. There it stayed for quite a while, exploring the sky a little to the left and right, porpoising just a little from time to time.

The leading edge spars were bent rearwards a fair way too, as you can see in the video at the bottom of this page. The air up there was fresh but smooth. I could relax a bit, after all, even though the wind strength kept the Delta to an uncharacteristic 50 - 55 degrees. Delta kites usually fly steeper than that.

A big passenger jet flew overhead at around 4000 feet, its pale underside camouflaged with the patches of cumulus cloud all around it.

The aircraft was close to the line-of-sight to the kite.

Conclusion: The Dowel Delta kite should really be scaled down a bit so the 5mm dowel is not under so much strain. I will eventually do this, and the result should be a stiffer, more efficient design. Of course, the extra loading might mean it won't stay up in very light winds. The Dowel Rokkaku is the kite for that!


The story above was an actual flying experience with the described kite. 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!

 




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This printable e-book takes you step-by-step through making a 119cm (4 ft) wide Parachute kite. It's not quite that wide in the air since the canopy takes on a distinct curved shape when inflated. This 14-cell kite performs best in moderate to fresh wind speeds. That's 20 to 38kph or 13 to 24mph. In gentle winds, this kite will hang in the air at fairly low line angles. In fresh winds, it pulls firmly for it's size, so small kids should only fly it while supervised!

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For the greatest chance of success, I make recommendations regarding the materials. For example, the type/weight of plastic, type/width of tape and line type/strength. Close enough should nearly always be good enough, since the design is well-tested and should be tolerant of small differences from my original.

Get the e-book for making the MBK Parafoil kite. After making your first one in plastic and seeing how it performs, you can try soft Tyvek or rip-stop nylon for your next build.

The e-book is a PDF file - which means printable instructions to refer to while you make the kite. It also means convenient off-line access if that suits you better.



What's New!

  1. Flight Report:
    Dowel Diamond Just Pips Dowel Delta

    Jun 24, 17 08:27 AM

    It was down at Knox Park on the last Saturday of the month, as is my custom...

    Except that the weather has not cooperated on the last couple of occasions. Even today the breeze was barely there. A frie…

    Read More





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Wind Speeds


Light air
1-5 km/h
1-3 mph
1-3 knots
Beaufort 1

Light breeze
6–11 km/h
4–7 mph
4–6 knots
Beaufort 2    

Gentle breeze
12–19 km/h
8–12 mph
7–10 knots
Beaufort 3    

Moderate breeze
20–28 km/h
13–18 mph
11–16 knots
Beaufort 4    

Fresh breeze
29–38 km/h
19–24 mph
17–21 knots
Beaufort 5    

Strong breeze
39–49 km/h
25–31 mph
22–27 knots
Beaufort 6

High Wind
50-61 km/h
32-38 mph
28-33 knots
Beaufort 7