I am trying to diagnose a persistent shimmy. Thinking I need a camera. I know nothing about go pro type cameras. How to mount? What camera do I need? What do I need to know that I don't even know to ask?
Teach me about go-pro type cameras
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rwellner98
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I'm not sure a camera will tell you much. :-(
Best case scenario is that you'll set it for slow-mo, get a good shot and see that your tailwheel is shimmying. But you already know that.
For me, 100% of the time my shimmy has been tire pressure. No camera in the world is going to be useful in diagnosing that.
Best case scenario is that you'll set it for slow-mo, get a good shot and see that your tailwheel is shimmying. But you already know that.
For me, 100% of the time my shimmy has been tire pressure. No camera in the world is going to be useful in diagnosing that.
rockwoodrv9a
Pre-takeoff checklist
You cant figure out what is wrong with a camera but you can tell what wheel it is. I have a gopro 9 and a gopro 360. If I were getting new I would probably go with the insta 360.
It felt like my shimmy was in my main gear until I watched the video. If you go to about :35 you can see the nose wheel starting to jump around 40 knots.
I ended up fixing it by increasing the nose wheel tire pressure to 40 pounds, getting the tire balanced, and a sealed axel. I dont know what the options are for a tail wheel. There are a bunch of mounts available. I made my own. Let me know if you want pictures and I will get some when I get back to the airport.
It felt like my shimmy was in my main gear until I watched the video. If you go to about :35 you can see the nose wheel starting to jump around 40 knots.
I ended up fixing it by increasing the nose wheel tire pressure to 40 pounds, getting the tire balanced, and a sealed axel. I dont know what the options are for a tail wheel. There are a bunch of mounts available. I made my own. Let me know if you want pictures and I will get some when I get back to the airport.
FPK1
Line Up and Wait
I use the Insta360 Ace Pro. After constant problems with GoPro 9 and 12 I moved to the Insta360 Ace Pro and will never go back to GoPro.
Yeah, not a tailwheel. It's a Lancair 360. I will mount a camera on the tail tie down location and see if it is able to identify the problem wheel. Guessing it's the nosewheel but suppose it could be a brake disc as the shimmy only occurs during braking and increases in intensity proportionally with braking intensity. Thanks for the replies.
rockwoodrv9a
Pre-takeoff checklist
Yeah, I saw your picture of your Lancair. What a nice plane. I just mentioned the tail wheel for others that are trying to find a shimmy. Im changing out my main tires to a slightly larger Wilkerson retread and hope I dont get a new shimmy.
Thank you for the compliment. We owned a RV-9a some years ago also. It was great in some aspects the Lancair is quite poor. When we had the RV I used Desser retreads on it and was quite happy with them.
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Just offer @SixPapaCharlie a ride. He’ll have cameras all over your plane in 5 minutes. 
SixPapaCharlie
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Just offer @SixPapaCharlie a ride. He’ll have cameras all over your plane in 5 minutes.
Where we going??
You’re going back to class, mister.
Brad W
En-Route
Do any of the consumer-grade go-pro types have any sort of high frame rate modes?
Way back when the idea of something like a gopro was total science fiction, my job was as a Reliability Maintenance Engineer in a large pulp and paper mill. Many responsibilities and tools in our kit with that job, but our primary mission was vibration analysis, balancing, and shaft alignment for rotating equipment in the mill.
This thread reminds me of a seminar I attended on vibration analysis. The instructor was a consultant, and he got sidetracked on one of many "look at me" stories...this one was related to the topic at hand, which was natural frequencies. Something about analyzing a shimmy on a car. The story had him recording a video of this car, and when the rotation would hit the rotation speed of the system's natural frequency, he said that the tire was jumping off the ground.
I've often remembered that story when I see these new cameras, and I've thought about all the cool things we could have done with them to diagnose machine faults. Pretty cool stuff I think!
Without knowing anything about your situation and potential problems, and just off the cuff without much thought....I think that I'd probably start with two views...one from the side and one from the front or back, just so that I could better understand the movement.
Way back when the idea of something like a gopro was total science fiction, my job was as a Reliability Maintenance Engineer in a large pulp and paper mill. Many responsibilities and tools in our kit with that job, but our primary mission was vibration analysis, balancing, and shaft alignment for rotating equipment in the mill.
This thread reminds me of a seminar I attended on vibration analysis. The instructor was a consultant, and he got sidetracked on one of many "look at me" stories...this one was related to the topic at hand, which was natural frequencies. Something about analyzing a shimmy on a car. The story had him recording a video of this car, and when the rotation would hit the rotation speed of the system's natural frequency, he said that the tire was jumping off the ground.
I've often remembered that story when I see these new cameras, and I've thought about all the cool things we could have done with them to diagnose machine faults. Pretty cool stuff I think!
Without knowing anything about your situation and potential problems, and just off the cuff without much thought....I think that I'd probably start with two views...one from the side and one from the front or back, just so that I could better understand the movement.
SixPapaCharlie
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Most of your GoPros will do 120 and some will do 240 frames per minute.
eman1200
Touchdown! Greaser!
Throw some vibration/mount shaking in the mix and you have the best jello video money can buy.
