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Fly it all the way to the crash site!

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Fly it all the way to the crash site!

Old 03-28-2019, 03:58 PM
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tp777fo
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Default Fly it all the way to the crash site!

Used my old saying to save another one today. YA F-22 owned by a friend. He a good builder and pilot but wanted me to test it as I had one prior. I flew out from SC to TX for the test flight. On t/o it rolled 90 right. I recovered and then it pitched straight up. I had no idea of what was happening. I got it on a downwind and it pitched up and rolled again. It was in the process of an uncontrolled flyaway over the lake. I pulled up and it went down, I rolled and pulled again and this time it climbed. I got it back enuf to get over the runway and saw something sticking out. I put gear down and got it back again
. The entire time it was rolling 45į left and right. On the ground we found both rudders fluttered and stripped servos. The right rudder was being held on by the control rod.

I always tell my jet students to never quit flying...even to the




crash site. If you quit flying it crashes for sure.
Old 03-28-2019, 04:08 PM
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gunradd
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Heís not the first to have that issue on the yellow. You MUST use good mechanical advantage and good links and rod ends. Also another guy lost his when one of those crappy plastic control horns that come with the kit failed.

You up need a big carbon fiber control horn. Got mine from BVM I think it was for the bobcat. Need to use the inside holes on the servo side.

Good save Tom!
Old 03-28-2019, 04:15 PM
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Congrats on saving the plane. Many would have lost it, both control and aircraft. Sounds like the owner made a good choice not flying it himself for the maiden
Old 03-28-2019, 05:10 PM
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Yeah reverse mechanical advantage, will get you some flutter for sure, had a nice 265 dollar servo ruined from this very thing.
Old 03-28-2019, 05:44 PM
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Originally Posted by tp777fo View Post
Used my old saying to save another one today. YA F-22 owned by a friend. He a good builder and pilot but wanted me to test it as I had one prior. I flew out from SC to TX for the test flight. On t/o it rolled 90 right. I recovered and then it pitched straight up. I had no idea of what was happening. I got it on a downwind and it pitched up and rolled again. It was in the process of an uncontrolled flyaway over the lake. I pulled up and it went down, I rolled and pulled again and this time it climbed. I got it back enuf to get over the runway and saw something sticking out. I put gear down and got it back again
. The entire time it was rolling 45į left and right. On the ground we found both rudders fluttered and stripped servos. The right rudder was being held on by the control rod.

I always tell my jet students to never quit flying...even to the




crash site. If you quit flying it crashes for sure.
You are a hero and got pictures!
Old 03-28-2019, 06:07 PM
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Great save Tom, I know thatís been an issue on a few of these.
Where in Texas is this one located? Nice to know Iím not the only one anymore.
Iíve flown mine quite hard and have yet to have any doubts in my rudder linkage. Hereís a pic of mine.
Old 03-28-2019, 06:13 PM
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tp777fo
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Rob lives in Georgetown and we flew at Waco
Old 03-29-2019, 12:29 AM
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I have a new vertical fin if you need it.
Old 03-29-2019, 01:42 AM
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Dieselman is it me or does that horn look like its been pulled forwards, there is a lump infront of the horn and a gap behind?

marcs
Old 03-29-2019, 04:38 AM
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Nice save. My first hockey coach told me "don't give up on a play until the whistle blows"

I learned that applies to more than hockey. Good job!
Old 03-29-2019, 05:13 AM
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Way to go Tom, great save!
Old 03-29-2019, 06:54 AM
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tp777fo
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Marc...i think you are right. Rob is going to replace all horns with cf or g10. He is remo ing the liteply backing plate from vert stabs and replacing it with 1/4 ply and hysol. big torque servos will then cure the problem.
Old 03-29-2019, 07:55 AM
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Was it a flutter?
Old 03-29-2019, 09:04 AM
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Great save! I've experienced a similar flight with a Kangaroo a few months ago, that thing should have crashed at least three times but persistence kept it flying till I finally was able to land it in one piece.
Old 03-29-2019, 09:37 AM
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Yes. Flutter on both rudders
Old 03-29-2019, 11:58 AM
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Those GP clevises ALWAYS needs back-up nuts on the threaded end side..........period! I have seen this episode over and over again, having worked in hobby shops for 20+ yrs. The clevis will always rock back and forth an be susceptible to flutter every time...............my opinion............I realize that was just one issue you faced.
Old 03-31-2019, 03:00 AM
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Great Save, hopefully a quick fix and up in the air soon!
Old 04-01-2019, 09:59 PM
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Originally Posted by marc s View Post
Dieselman is it me or does that horn look like its been pulled forwards, there is a lump infront of the horn and a gap behind?

marcs
You made me go double check it Marc, just a glob of hysol, itís solid as can be.
Old 04-02-2019, 06:58 AM
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Originally Posted by tp777fo View Post
Yes. Flutter on both rudders
Please help me understand what specifically caused the flutter. Thanks.
Old 04-02-2019, 07:24 AM
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Great save!! I bet your buddy is really grateful!
Old 04-02-2019, 08:55 AM
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tp777fo
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The YA arms are flexible nylon, servos with insufficient torque, large rudder area and poor geometry. Are among the leading cause of flutter
Old 04-02-2019, 09:51 AM
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Originally Posted by SECRET AGENT View Post

Way to go Tom, great save!
Haaa
Old 04-03-2019, 05:31 AM
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Happened to my with my F-35. I hand't realized the servo would take so much load (must be a V tail deal!), and simply CA'd the servo mount in place. I cold not trim roll, but the other rudder was ok...so I landed it normally.

Looks like the trip paid for itself!

David
Old 04-03-2019, 08:10 AM
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Great save and agree with others on the mech. adv. Given it happened to both sides and as soon as you took off meant there is no margin really in the design. Kind of shocking as hinges/surfaces look solidly mounted. The servos type/torque used here is how much?

Last edited by dbsonic; 04-03-2019 at 08:26 AM.
Old 04-05-2019, 10:04 AM
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You're absolutely right Tom! Fly it till it wont fly no more. I learned this from my motorcycle road racing days. Whenever you think your not going to make the corner..try anyways, you have nothing to lose. Most of the time you will come out ok. But as you say.. if you give up, you will for sure crash..100%

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