Pushing the MBK Rokkaku Kite

by Craig Ensey
(Lebanon, Oregon, USA)

First flight of the MBK Rokkaku

First flight of the MBK Rokkaku

First flight of the MBK Rokkaku
It's still up even after I goofed on the sil pocket!
In the air!
More in flight shots

Recently, I got the kite bug and again and I had to build something new. This time I wanted success so I set out to build an MBK Rokkaku kite that was 100% stock. Building from the plans without mods is a new concept for me since it's in my nature to change working designs for no real reason. The intended results are often worse than I expected!

After rounding up my frame, sail, and some odds & ends, my project was at a whopping $3.23 (USD) with a lot of sail material to spare.

In fact, The sail is cut from 9 foot by 12 foot sheet of .7 mil painter's drop-cloth which I purchased at the dollar store. Since it is a large sheet, I will be able to cut several sails from it.

The spars are 1/4 inch poplar dowel from Home Depot. The bowlines and toggles were made from cotton twine and wooden beads from my wife's jewelry supplies.

When I cut the sail, I chose to cut two layers out at once rather than folding it over as per the plans. The two layers were taped together with electricians tape so you can see the outline from a distance. Total construction time was about 3 hours over two evenings. It was also a very easy build. I highly recommend this for a first time builder!

Although I had doubts about the durability of the drop cloth, it has been through several rough landings and one encounter with a tree that tore a small hole in it.

Flying the MBK Rok kite for the first time was a different experience since most of my kites are heavy wind fliers. It was flying very well in a light breeze with some mild gusts. The Rok is much better suited for Willamette Valley weather than my Rhombus Box Kite or my Peter Lynn Box Kite which would not have flown in such a mild breeze.

The first flight was on a cloudy day with some "spitting" rain that turned into a classic Oregonian hydro-assault moments after I launched the kite. Yes... I know I'm not supposed to fly in bad weather where I could get struck by lightning, but I'll take any air time I can get!

I found a few hours after Church the next day and I went to the park with my 3 year old for some quality time with him and some time to fly the kite. That outing was sunny, but the wind was very inconsistent and gusty (again) so I didn't get a long flight. I also had issues with the spine poking through it's pocket on the top corner of the sail as you can see in my pics. Nevertheless, I still got some great pics of it in flight!

Today, I decided to go out again for some flying in a fresh breeze. I should have listened to that small, logical voice in my head that said "You're going to implode your kite if you try to fly in a wind this strong." Of course, I didn't listen seeing as how this light wind kite had been modded into a heavy weather kite.

Like many anxious kite fliers, I beefed it up and put 5/16" spars all around for some extra strength. This worked for about 20 seconds, just long enough to get out of ground effect. It was no surprise when the kite imploded and came down to me with a broken spine.

After all these trials which resulted in more mods to the frame, I think I will go back to making a "bone stock Rok" with no mods whatsoever. It flew best when it still had 1/4 inch spars, but there was still a lot of flexing in the bowed spars so I may still use 1/4" instead of 3/16".

Some questions: Does the extra weight from thicker spars really hinder the kite's performance? Also, where do I set the tow point? I was unclear on that in the plans page.

This is a work in progress so I will do another report when when I get a good long flight with the MBK Rok. Maybe I'll get my Rhombus Box, Peter Lynn Box, Pearson Roller, and my Rokkaku all up at the same time. That would be pretty cool, but difficult since they all fly in different wind ranges.

I hope this isn't too long, Craig E.

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Roks and rollers in gusty conditions
by: Tony Sangster

A trick for gusty conditions is to have elastic in the back section of the bridle(s) of the rok or roller, so if the wind gusts the rear section of the bridle(s) lengthen(s) and moves the tow point forward.

Looking for a light wind kite...
by: Craig E

What is the BEST light wind kite that you know of? I've heard good things about the rokkakus, deltas, and diamonds. I've also had good experiences with my Pearson roller. The issue I have here in Oregon is inconsistent or gusty weather. Any input would be invaluable. Thanks, Craig.

(T.P.: Any design built light enough will do ok in light winds. However, light-wind Deltas are a lot of fun in very light conditions. Try my Dowel Delta for that. Otherwise, the Dowel Dopero (DOuble PEarson ROller) is very efficient over a somewhat greater wind range - which sounds ideal for your situation!)

Never too long
by: Tim Parish

Don't apologize for writing too much, people love a good story! About kites of course, if they have found their way to this site.

About heavy spars, I could mention 3 disadvantages...

1) It will take a stronger breeze to keep the kite airborne. Equals more frustration on very light-wind days.

2) All other things being equal, the kite will not achieve the same altitude or height over the ground. As soon as the kite's weight plus the weight of the flying line is equal to the lift force generated by the kite, the kite can go no higher.

3) Most kite designs will become somewhat less stable as the spar weight goes up. If taken to an extreme, you could end up with a kite that refuses to stay in the air at all, regardless of
wind speed.

Of course, a modest increase in spar size does have one advantage - the kite will resist breakage in wind speeds that might break a lighter kite or force it into looping as one side bends a little more than the other.

Looking forward to your next flight report!

PS - regarding bridle adjustment... Try setting the upper bridle lines at a 90 degree angle to the vertical spar, viewed from the side, with all lines tight. From there, you should be able to shift the knot aft (towards the tail) a little at a time to get the most out of the Rok in the lightest winds.

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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