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Joined Nov 2011
6 Posts
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Anti-porpoise mod
OK, first the disclaimer: This works for my plane. I posted before and after-mod video clips to show the effect of the mod and the basis from which it achieved a change. Your results may vary, so you might want to proceed with incremental adjustments. I say this because I noticed Blue-Sky flight videos posted by a couple other people that looked as steady as mine after my mod. I do not know if those posters modded their planes or not so I assume there may be production differences from plane to plane. You may need more or less correction.
The mod basically brings the horizontal stabilizer more in-line with the plane of the main-wing chord, but not completely. I did it without making an adjustable trim surface to keep drag down. You still need some "up" elevator for the plane to fly, just less of it than my plane had out of the box. So here it is: 1) Remove the tail section. I carefully cut the glue line and tape using an x-acto knife. ![]() 2) Mark a trim line on the base of each vertical stabilizer from the leading edge point at the base to a spot on the trailing edge just a little bit up from the base. I used 1/8 inch at the trailing edge. ![]() 3) Trim the base of each vertical stabilizer along the line you marked. You will be cutting away a long thin triangle of foam allowing the horizontal stabilizer's trailing edge to sit lower when the tail is re-attached. ![]() 4) Re-attach tail piece back to the fuselage as before, but now it is attached at the tail's newly cut edges. I used tape in case further modding was needed. For mine it worked fine. That's it! Good luck. My plane still is touchy in wind so I want to "adjust" the swept forward wing-tips next. Flight before mod:
Flight after mod:
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I'm sold
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Maybe I have to experiment more, it has been windy, but i want my 300' back baby... Petey... |
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