Pansh Angle-of-Attack Mod for Ace 5m

This review aims to cover:

1. How to easily and non destructively change the Angle of Attack AoA of the 5m Pansh Ace

2. Why you would what to do this

3. The results from some of my experiments, to demonstrate what to expect

While this article is specifically aimed at the 5m Pansh Ace, The principles applied could be used on almost any kite, it would just depend on how the bridle was constructed. However all the measurements and fittings would differ from kite to kite, and size to size.

For a brief introduction to Angle of Attack (AoA) see:

* http://www.racekites.com/theory/angleofattack.asp

To test out my ideas I constructed a full Adjustable Angle of Attack (AAA) x2 bridle similar to that found on some production kites (some U-Turns, PKDs and the BladeIV). Rather than repeat everything the diagrams in this manual show what I fitted to my Ace x2 (note - the Blade AAA kit WILL NOT fit the Ace)

http://www.flexifoil.com/downloads/instruction_manuals/bladeiv_tripleA_ammend.pdf

Using my AAAx2 bridle I can alter the AoA for my Ace (on the ground) in under a minute. HOWEVER, the measuring and tieing of this AAAx2 bridle was quite complex, needing a lot of patience and accuracy It took me around 4 hours work in total. Also I'm not sure of the long term durability of my handiwork. Hence now I've finished playing with AoA, I've fitted this EASY PEASY AoA TWEAK (EPAT)

This EPAT has the advantage that it is:

* a non destructive way to change the Ace AoA and easily removed to return the kite to its "factory" state

* very easy to fit and quick to make,

* needing very little materials

* very difficult to get wrong!

* easy to understand

* causing less drag than AAA

The downside that:

* you have to undo a the bridle leader loops to fit or change it.

* It takes me about 4mins to reconfigure the AoA with EPAT, as opposed to 1min with AAA

So how does it work?

The Pansh Ace is bridled as shown in the diagram below.

To decrease the AoA you have to:

* lengthen the B row of bridles,

* lengthen the C row by double the B measurement,

* lengthen the brakes (or shorten power lines to keep the hands in the same neutral position)

To increase the AoA you have to:

* lengthen the B row of bridles,

* lengthen the A row by double the B measurement,

* shorten the brakes (or lengthen power lines to keep the hands in the same neutral position)

There is a slight complication in that on the Ace the AoA of the tips needs to be less than the root (called Washout), I found if it was the other way, with greater angle at the tips (Washin) the kite was unstable.

With EPAT these changes in the A,B and C bridle are achieved by adding simple measured loops.

EPAT

The measurements below will allow you to adjust the AoA of the 5m Pansh Ace by the following amounts:

* minus 4 degrees AoA

* minus 2 degrees AoA

* plus 2 degrees AoA

* plus 4 degrees AoA

To achieve negative AoA you need to make the following double loops. Its best not to get too fixated about the measurements of the loops themselves, as different thickness of line take more or less distance in the bridle attachment loops. What's important is the changes to the bridle lengths the loops achieve when fitted and pulled tight:

* C row - C2/3/4 = 2x 28mm and 48mm - (changing length by 20mm and 40mm)

* C row - C5/6 = 2x 31mm and 56mm - (changing length by 25mm and 50mm)

* B row - B2/3/4 = 2x 18mm and 28mm - (changing length by 10mm and 20mm)

* B row - B5/6 = 2x 18mm and 31mm - (changing length by 12mm and 25mm)

To achieve positive AoA you need to make the following double loops.

* A row - A2/3/4 = 2x 18mm and 38mm - (changing length by 10mm and 30mm)

* A row - A5/6 = 2x 31mm and 56mm - (changing length by 25mm and 50mm)

* B row - B2/3/4 = 2x 13mm and 23mm - (changing length by 5mm and 15mm)

* B row - B5/6 = 2x 18mm and 31mm - (changing length by 12mm and 25mm)

I made my loops from 150kg SK75 Dyneema, and the extra 6 to 8mm on the first section of each is to allow for the extra length needed for the extra set of loop connections. This measurement will vary with the line used, hence my stressing it's the overall length changes that are important, not the loop length,

You could make it even simpler, and just make a variety of measured single loops. This might be a lot easier, entirely up to you. Use:

* green measurements for two degreees

* blue measurements for four degrees

Any power or bridle line 150kg and stronger would do, it takes around 2m in total. Construction is easier to show than describe. Here's a part set to allow -ve AoA only (B&C) ...

To construct them I first fold the line in half, and tie a simple overhand knot at the right position for the first knot, then do the same for the second. I trim the line ends to 1cm overlong, and then use a lighter to seal the ends. Simple. It is a good idea to label or colour code them somehow ...

Fitting the EPAT.

* For minus AoA you use the B and C set ONLY

* For plus AoA you use the A and B set ONLY

I'll demo minus 4 degrees AoA attack below (end settings) but the principles are the same for -ve and +ve.

1/ Undo the loop on the big black knotted pig tail that collects the three bridles leaders on each side together.

2/ As the very tip (1 column) A, B & C are very close together, and are very close to the 2 row, I've found you don't need to change this one. Hence put this bridle set to one side.

3/ Undo the bridle leader loop that collects A-C/2-4 together

4/ Loop together B 2,3,4 together using the 18/28mm loop

5/ Loop together C 2,3,4 together using the 28/48mm loop

6/ Reattach the bridle leader loop by going though A2,A3,A4 and the end loop of the B and C EPAT loops you introduced above (end loops = 4 degrees, shorter loops = 2 degrees)

7/ Repeat this process for the bridle leader loop that collects A-C/5-6 together using their appropriate loops.

8/ Redo the black link cord to pull the three bridle leaders together, you can retie it with a smaller knot. Note I've changed the pigtail here, to make the powers more obvious.

9/ One side done, repeat with the other.

Adjustment of AoA is achieved jut the same way, moving all the bridle leaders to the same loops remembering

* For minus AoA you use the B and C set ONLY

* For plus AoA you use the A and B set ONLY

That's it! its that simple.

======UPDATE=======

Clarkee has come up with an alternate way of doing this which allows adjustment both ways ... nice one mate!

"Make row C and row A loops with five knots in it and row B loops with only 1 knot.

The middle knots of loops A and C would be equal to the length of the row B loop and by moving row A up a knot and row C down a knot or vica versa would pivot the kite around the row B altering the AOA

A1/B1/C1 length would also need an extra loop (the same size as B row) to account for the overall length of the other loops."

Also many thanks to Castle who has added another excellent alternative that could be used in addition to Clarkee's above,

"Why not just larkshead the bridles onto your red knotted lengthening cords rather than attaching the way you show. This would allow easy adjustment without taking the bridle apart each time"

Keep the ideas coming folks!

=================

Why would you want to do this??

Changing the AoA fundamentally changes the way the kite flies.

Increasing the AoA will ...

* Make the kite fly slower.

* Will allow it to fly in less wind.

* Will decrease the size of the wind window (kite doesn't go as high or wide)

* Will give more lift and float

Decreasing the AoA will ...

* Make the kite fly faster

* Will increase the size of the wind window and makes it easier to get upwind in buggy

* Will give less lift

* Will require more wind to fly.

So which way do I adjust my Ace??

That's really up to you, what you want, and what your Ace currently does. By far the best advice is:

* FLY IT FIRST, IF YOU ARE HAPPY WITH IT THEN DON'T CHANGE IT!!!

Having said this there are reputable reports that not all Pansh Aces are the same.

Mine was one of the initial batch and it was VERY lifty. Hence I'm now running it with minus 4 degrees AoA to make it faster and less lifty in a buggy.

If your Ace is lacking lift, then its possible Pansh have reduced the AoA on latter models. Try increasing the AoA 2 or maybe 4 degrees ... but DO THIS CAREFULLY IN LIGHT WINDS. With the Ace in "lift" mode, it will loft a 20+ stone person when simply parked at the Zenith.

Lastly there is no reason to stick to my measurements, so long as all the measurement are in proportion there is no reason you couldn't go for 3 or 6 degrees ...

The best advice is just try it, experiment, and have fun doing it. Then see if you like your modifications in a variety of conditions.

Experimental results

As the Ace's seem to vary I'm not going to give my results in degree measurements. Instead I'll describe the flying characteristics I found in various setups:

Acceptable range

Higher range AoA

Kite launches fine, straight up to the Zenith, loads of lift and pull but slower. Easy to get jumps with nice float, Lifts even parked at the Zenith. Kite is difficult to fly out of the window and difficult to luff. Wind window is quite small - under 90 degrees.

Lower Range AoA

Kite is noticeably faster with lower lift. Kite now flying much higher, definitely over the top, beyond vertical. Wind window much larger, beyond 90 degrees. It is quite easy to fly the kite out of the window and luff it. Even sitting at the edge, a small gust can take the kite out of the window and luff. Recovery should be Ok without "bang re inflation", but it may Bow tie

Troubleshooting

Too low AoA

VERY fast, looking good until it gets to the edge of the window, then the upper most tip folds every time.

Too High AoA

Kite difficult to launch, sits very low in window, very slow and grunty.

Washin - angle of tips too high

Kite is very unstable at the edges. Its quite odd, but with the kite sitting at the edge, a slight lessening of the wind sees the kite starts to fly backwards, deflating slowly. Its difficult to recover from this.

By : andya