texomalaser -

I read that you are having a pull to the canopy issue on down lines. While changing thrust line will definitely address this issue, doing so will also effect every other trim aspect of the aircraft (up lines, level, inverted, etc.). So, you will have to go through another trim cycle if you want everything to fly right. However, have you thought about mixing throttle to elevator - if you have a computer radio that is? If you have the ability to apply a mix - try about a 1% down elevator at throttle idle. No need for a curve here - just down ele at idle. As the down line is established and at idle the down elevator is effective regardless of speed change. It is this increase in vertical velocity that is causing the wing to generate more lift and pull to canopy. That very small amount of down is also impacted by increased velocity and keeps things tracking straight. It has the added advantage of conditioning throttle management - something a number of sport flyer's overlook when they scream down from on high or toward the bottom of full throttle loops and rip the wings off.

I have never really seen this mix require anything more than 1 or 2% - Well, I know a guy that required 5% but that was because he had incidences going every which way (the airplane just wasn't built straight).

As stated earlier, the thrust line change will CHANGE A LOT - on down line you are at or around idle where engine thrust line has minimal impact. The thrust line change requires extensive trim flights because the change impact is across the entire range of throttle settings and aircraft speed. That thrust line is a vector related to flight path, speed, and angle off.

Off topic, but I hope this help some folks out and maybe even invites a new topic thread in another forum.