I am Bryan Hebert, the creator of triangulation trimming. hebertcompetitiondesigns.com
First you must understand the correct priority of trimming a competition airplane.

#1 is C/g this is always close to 25% if you are around 950 sq in.But if the wing is bigger, say 1000.= like your Spark you may be able to move it back to say 27%
altitude, also plays a role. If you are a couple thousand feet above sea level, then you can run the c/g back a little more.
It`s a matter of the of the main wings (size, airfoil ) ability to handle 11-12 pounds of payload (wing loading)

There are two ways to induce wing inc. with the wing by adding inc. ,or by moving the c/g back. The latter is one that gets you in trouble with the mixes poor snapping tip stalls , poor spin exits ect.

My inovative method uses the wing , and a more forward c/g than the traditional methods of the past 20 years.
The positive incidence allows your to move the c/g forward 10% or more giving your a more stable platform to fly and control in all conditions.

#2 wing Incidence,,, if your wing is at 1000 sq in. (spark) set the inc at .5 if it is 900 or smaller you will sometimes need to adjust it up to 1 deg.positive.

After your wing adjustement, fly and trim the airplane for hands off flying if the airplane goes to the canopy in a upline increase wing inc. keep increasing the wing inc. untill it will go up perfect under any power setting then stop. you will see that increase in wing inc. will make the airplane climb requiring a need for down trim ,this keeps the airplane happy in both hroz. and vert. lines ( 1 deg of down thrust 1 deg of right thrust is all that`s required for the motor setting ) because the wing is now directing the flight of the airplane through the elevator trim ,not thrust for the most part, the throttle will not effect your up line, or horizontal lines.

#3 after the airplane will fly hands off on a horz. line and up line.
check the knife edge , first do a right rudder knife edge it should track perfect without pitch , (assuming the elevator halves are perfectly set, this is a very important step! ) if it goes to the canopy move the c/g back a little ,if it goes to the belly move it forward.
Next try a left rudder knife edge ,,NOW! here is the tattle tail for the c/g placement. because of the prop slip stream it`s more sensitive on left rudder knife edges.If the model pitches to the belly continue to move the c/g forward until it stops ,if it goes to the canopy move it back a little .

Shortcut Tip,,, if you go to the canopy on the left rudder knife edge you are very nose heavy.
If it goes to the belly on a right rudder knife edge you are very tail heavy.

After this step is complete re check the vertical if you were way of on c/g this could have effected the required wing setting you used for the up line adjustment ,then repeat steps 2 and 3.


No black Magic ,, now that the wing is flying the plane with a forward c/g, and the thrust has less effect on pitch/yaw, the airplane is neutral. And with the cg forward, the elevator has more efective power around neutral.
Remember c/g forward the surfaces have more power around center,with the c/g back the airplane becomes sensitive around center with less power and control


After these three things are performed to your satisfaction (trianglation trimming you strart setting your airplane up for the throws in the class you fly , the c/g and wing inc. setting should not be different from Sportsman to FAI.

One big mistake ,and an old wives tale from the past ,is the airplane should fly hands off upright and inverted ,,this is not possible and is usually the cause of many problems ,trying to chase this legend!
You must not confuse radio setup with airplane setup they are not the same thing. get the airplane flying perfect in the three planes,then, set the radio up to fly your pattern with precision.

Re read the article on my website. All the clues are there, then when you perform what I wrote, your eyes will be open more, and you will be able to understand better what took place.
Really it`s just 20 years of designing ,trial error and observation ,correction

I went mad trying to make sense of all the trim articles of the past they are all wrong for the skills of todays modern Pattern requirments.

Don`t try to understand it till you use the method then it will be clear as a bell