Did you check the actual mechanical position of the stabilizer after you landed? I had a similar issue and found the tension spring on the trim cable was too weak. So I made a bracket to tighten the cable which helped. Even then it appears the trim cable stretches slightly. Occasionally to trim at higher speeds I grab the trim cable with my hand, twist it to tighten. Only then will the trim move. The faster the Cub goes, the higher the loads on the stabilizer, the more the cable wants to slip. Even after making the cable a lot tighter, I still occasionally have it slip.The only significant squawk was lack of enough nose down trim to fly hands off at 110-115 mph that engine break-in requires. It has Javron's riser butt hinges, 3/8ths of an inch more AOI at the front spar. More-better disease. It probably needs to go back to stock which means pulling tanks, re-rigging, new weight and balance. I got a little greedy I guess. Live and learn.
No, we thought we could cheat a little without raising the forward edge of the stabilizer. I guess that would be another path but I'm not eager to do it. I did have 20 lbs in the extended baggage for the first flight. I will fly it again without the weight and check the max speed that it will trim out at before I change anything.Was the horizontal indexed to compensate for the revised AOI?
Maybe try adjusting the CG a little to calm it down? A little weight can make a big difference.
That is a good pic. Sorry I did not make myself more clear also a view of the entire tail from the side to see the stabilizer/elevator relationship at full nose up trim.
DENNY
Thanks for your help Bill!
That last 10% was a real eye opener. The 90% done, 90% to go saying is true!
The only significant squawk was lack of enough nose down trim to fly hands off at 110-115 mph that engine break-in requires. It has Javron's riser butt hinges, 3/8ths of an inch more AOI at the front spar. More-better disease. It probably needs to go back to stock which means pulling tanks, re-rigging, new weight and balance. I got a little greedy I guess. Live and learn. I also pointed the vertical stabilizer 2 inches off center at the top of the cabin. Probably fine for 80-90 mph but I'm holding left rudder all the time at 110 mph.
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I had my fuselage built with the upper longeron tubes attached to the tail post 1 inch lower than stock to change the tail angles and account for the added wing incidence. Shorting the lower longeron will have the same effect and is a semi common fix for issues/or mods in Alaska I would finish breaking in the motor and just think about things for a bit. I think skywagon8a has the right answer. For the mission you have vis over the nose is very important!! You may have to fly a bit to find the skill for the job but other than paint it does not take that long. Just keep flying and see if it is not some other simple issue.
DENNY