Originally posted by Astronome
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New to the forum with a UH1-D 800 series
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On my 212 600, with the same tail drive (slightly smaller)
The drive shafts to the tail rotor I have both aligned in a lathe and both were not perfectly straight
I also placed a ball bearing on the short shaft and 2 bearings on the long shaft. I also secured the bearings of the 45 degree teeth on the gears, tail had no vibrations on 1st flight. See video made in my backyard , tail doesnt shake at all
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I see that. I also see 14 poles listed for another A50-12L V4. My suggestion would be to count the poles in your motor to be certain, due to the very strong possibility your vibration issue is due to an incorrect ESC pole number entry. I got that number wrong on a 600 heli build several years ago and the vibrations were dramatic.
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The Hacker A50-12L V4 shows to be a 14 pole motor. Is yours an older version? Also lists timing at 20-25.
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Ok. What motor are you using? Also, what are your PWM and timing settings?
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Ok, I have no experience with Jeti…only Castle Creations, Hobbywing, and now Scorpion Tribunus which all require poles/2. I do know that setting up the wrong number in that category will induce heavy vibrations as I have experienced on one occasion.
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Originally posted by PawPaw View PostIf it’s a 10 pole motor, did you enter 5? It’s poles / 2 = factor.
No in the Jeti ESC, it is the number of real poles that must be indicated, I ask JETI for validation.
I also checked with a tachymeter.
I'll give you a picture tomorrow (it is 9:30 pm in France)
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Also, is you drive belt too tight or loose? YouTube has a good video on proper adjustment of the belt.
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Originally posted by PawPaw View PostJust thinking out loud…..are you sure your motor pole count is entered correctly in the ESC/FBL governor?
The Jeti Box allows you to read the parameters in clear:
- Rotor/motor ratio 1:13.8
- Rotor rpm mini/max: 1160/1240rpm
- Number of poles: 10 for the Hacker engine
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Originally posted by F106DeltaDart View Post
Personally, I’d try a set of tests slowly removing components from the mechanics. First try removing the blades and running it up. If it’s still present, you can eliminate the blades as a possibility. Next, remove the head and run it up. If vibrations are still present, you can eliminate the heads as a cause. That should help narrow down the options.
Beautiful Vario choppers by the way, that’s some excellent craftsmanship!
That's exactly what I did.
Balanced blades
Verified Center of Gravity: Vibrations still present blades removed.
Head removed: ditto
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Just thinking out loud…..are you sure your motor pole count is entered correctly in the ESC/FBL governor?
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Originally posted by Astronome View Post
Hi sfc,
Maybe, but I have the latest version of mechanics HSM800 (with the helicoid gears)
Beautiful Vario choppers by the way, that’s some excellent craftsmanship!
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Originally posted by sfcfury View PostI know in there older mechanics sets, the main shaft bearings were suspect as well, but that probably seems to have been mostly corrected. Perhaps just a bent main shaft?
Maybe, but I have the latest version of mechanics HSM800 (with the helicoid gears)
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