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Old 10-20-2017, 04:11 AM   #1
EAABipe40FF
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Default Acroduster Vibration Part 6

They say it ain't over till it's over. Maybe?

I renewed my insurance on the Spezio with new carrier thru Falcon. The new company wanted my pilot profile and I didn't have a clue. I keep a daily log of all my building work on both airplane along with flying time. I only update my pilot log book when it's time to fly with an instructor. I just finished my log update.....

Anyway I found exactly when the vibration started. It was the very next flight after I had removed and painted the lower stab. struts.


I had reviewed my daily log earlier to see when it started but somehow missed that entry. May be nothing, it was simple to remove/replace. I didn't change the struts, just loosened the top wires a turn and then took them back. But you bet I'm going to take a very careful look. I was doing a bunch of other stuff. the 2-place canopy, outfitting front pit, swapping windshields. I admit being focused on the engine which was smart but maybe I was too focused on it and missed something else?

It would be nice to make a small adjustment on something and the vibration goes away. But I'll hate myself when I think of the $1k plus for engine mounts, dropping prop, etc......

If so, Oh well

Jack


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Old 10-21-2017, 11:24 PM   #2
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I got around to looking at the rear end of the airplane instead of the front. I grabbed the wires and they seemed tight enough although the right rear wire seemed slightly looser than the others. I took a turn on it and the front right wire then seemed slightly loose so I took a turn on it. I strummed all four and they seemed close to being equal.

Frankly I couldn't imagine this would have any effect. But it did. I took off, climbed out at 85 IAS smooth as silk......got to 2500' and pushed over to cruise. Level at 125 IAS I throttled back to 2500 RPM. This is when the vibration had been most evident. I can't say it was as smooth as a new baby's backside but I can say this,

If I had properly re-tensioned the wire/struts on this airplane 14 hours ago on 4/18/2017 and 29 hours TT not only wouldn't this topic be part 6, but there might never have been a part "Vibration Part 1"

Oh well,

Jack


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Old 10-21-2017, 11:32 PM   #3
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It's behind you now. Look forward to some smooth flying.
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Old 10-21-2017, 11:36 PM   #4
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Why did it take me so long. Partly because I wasn't very concerned. Thought is might be normal. It wasn't until Dave started his own thread that I became concerned myself.

http://www.biplaneforum.com/showthread.php?t=15720

No excuse. I should have been concerned and a good review of my build log might have resolved the issue sooner. But I became focused on the engine and/or propeller which because of finding metal in the filter had me spooked.

I'm still spooked but my feet aren't shaking on the rudder peddles.
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Old 10-21-2017, 11:41 PM   #5
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Well Jack, I’m glad to see you trumped my 5 part build thread with your 6 part vibration thread....... carry on......
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Old 10-22-2017, 12:15 AM   #6
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Quote:
Originally Posted by smizo View Post
Well Jack, Iím glad to see you trumped my 5 part build thread with your 6 part vibration thread....... carry on......

Alas no comparison. Your threads are examples of creative excellence. Mine efforts in futility. Or so it sometimes seems to me?
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Old 10-22-2017, 12:31 AM   #7
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It's not futile if somebody else can avoid the same issue because of your experience. Besides, I've really enjoyed following your progress.
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Old 10-22-2017, 11:20 AM   #8
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I hope it helps someone. Thanks.
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Old 10-22-2017, 02:05 PM   #9
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Ah well live and learn Jack, there is no such thing as a wasted excersize. You just kept eliminating possible culprits.
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Old 10-22-2017, 07:08 PM   #10
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Fact is Larry, I had given up and airplane is for sale probably w/o engine. Pure luck that I reviewed my log and realized the connection. Doesn't matter in the end but it cost me at least a wasted $grand.

Hopefully a lesson for others. Keep good records especially if your memory isn't there anymore. Only make one change at a time. When something happens or changes you should probably take it seriously. etc...

Jack
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Old 10-22-2017, 07:40 PM   #11
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A happy ending story.

No excuse not to go flying now!
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Old 10-23-2017, 01:14 AM   #12
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Well the engine still has 2100 SMOH and has still been making metal. I'll take advantage of this nice weather and fly it some more. 5 hours on the present oil filter. A few more hours and I'll cut this filter. Any more metal at all and it's over.

The airplane and/or engine is still for sale. I've had a couple serious offers for both but not quite there.

Bottom line(again). I satisfied my goal of LSA compliance. We need to sell one of the airplanes. We need 2 place. Problematic engine and need more power anyway for 2 place, we have decided to keep the Tu-holer.

Jack
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Old 10-23-2017, 01:21 AM   #13
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Jack,

You are a true experimenter, You set out with a goal of an LSA compliant biplane and achieved that goal. Feel proud !

The engine making metal is a separate issue.

Bob
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Old 10-23-2017, 01:38 AM   #14
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I think you did a great job of chasing the vib and not giving up. Good job.
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Old 10-23-2017, 05:18 AM   #15
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Ok , it has been a journey and a good one at that.


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