RCU Forums - View Single Post - Help with a Dave Patrick Edge PLEASE!!!
Old 05-10-2004 | 10:18 AM
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coony2787
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From: Oxford, MS
Default Help with a Dave Patrick Edge PLEASE!!!

I have a Dave Patrick edge with a ZDZ 50 and JR digital servo's all the way around.

I built the plane and flew it and made a few adjustments to the CG and the plane was absolutely awsome i couldnt ask for it to fly any better. It lasted 2 weekends.

Then on the third weekend out with this plane it just went too sh@#. The plane went to flying so bad that it was almost unflyable. I landed the plane and took it home.

I then proceeded to check the plane all over !! I rechecked the CG and found that the CG was a little aft of what i had set it at and the wierd thing was that i have removed 3/4 of an oz. of tail wieght while flight trimming. I rechecked the incidence on the stab and found that it was OK. I checked all glue joints everything that me and a freind could think of to check. We came up with pretty much nothing!!!

I went back out a flew the plane again still the plane is on the ragged edge and fly's bad , meaning that when the throttle is pulled the plane drops the tail. And when flying inverted the plane is in level trim, no elevator input needed at all. It is almost like you cant trim the elevator one pass the plane climbs and the slightest elevator input and plane is climbing or falling there is no inbetween. The plane is just pitchy.
So after this flight test i decieded to try adjusting the stab by adding + incednce to the stab to try and get to the nose of the plane to drop when the throttle is pulled and also to get knife edge to preform correctly , it always pitches to the belly in knife edge so i figured i would fix both worlds by doing this.
Now after i adjusted the stabs the nose does drop when the throttle is pulled but the plane now climbs when rolled inverted! Actually it will do a very steep climb when rolled inverted. However i know that the CG is set forward of the recomended CG range wich is 5" behind the leading edge. Iam at 4 3/4" so i'am pretty nose heavy seeing as how the origianal CG range was set @ 6 inches.

I am at a total loss as to what has happend to this plane. I know it did fly good and now something has changed and it is just not enjoyable to fly or land. Landings are almost a crash every time. It takes all of my piloting skills to land this beast now! It comes in and when it starts slowing down the tail quit flying and if your not quick with the down elevator it will drop the wings and blam it is on the run way without a moments notice!

If anyone can put some input in on this i would greatly appreciate , i can provide pics if anyone wants to see the setup i have and or anything special about the plane.
And also when i read this myself it seems like a CG problem but i have rechecked it and the CG is now at 4" behind the wing's leading edge because i added nose wieght yesterday trying to fix the problem and it does not help.
the plane wieghts in at 15lbs 4 oz. and yes i know this is a little heavy but it did fly good at this wieght for 2 weekend's. [][][][][]

Chad