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HelicopterScale Model RC Helicopters › Need help with weird tail vibrations
04-04-2017 02:05 PM  3 months agoPost 21
aashu

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scotch plains, NJ

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Hi

I would say around 1000 RPM. I have a linear curve and at about 65% stick position..

I am using 12s on 415KV with 90/18 on gear and 22/48 (SDP pully) on belt giving me 10.9:1 ratio

Garden State, NJ

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04-04-2017 03:07 PM  3 months agoPost 22
aashu

Key Veteran

scotch plains, NJ

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video

with new blades , pitch slider and shaft.

Watch at YouTube

another one with blades off

Watch at YouTube

pictures

https://rc.runryder.com/helicopter/...1&TZ=99&a=1&s=0

https://rc.runryder.com/helicopter/...2&TZ=99&a=1&s=0

Once it starts to do that, I can see the shaft move somewhat side to side

Garden State, NJ

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04-04-2017 03:39 PM  3 months agoPost 23
Notar

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Taxachussetts

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First, the gear ratio should only be 9:1. You are almost 11:1
The bottom should be 40:22 not the 48 tooth you have down there. You are overspeeding the tail rotor, so even if the head is 1000, the tail is way over what it should be. Change the lower gear back to a 40 tooth, and it should be good. Also, the Kv of that motor is really too high. I rarely go over 300Kv on these mechanics to get the head speed i need, especially with 12S packs. You may want to go down to 10s packs as well.

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04-04-2017 04:27 PM  3 months agoPost 24
aashu

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scotch plains, NJ

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Thanks

Thank you Joe. If I go with a 300kv but keep 12 cell and 48p , would that work ? I am hoping to avoid getting set of new batteries . Would 11:1 not be better since tail would be even slower due to 48p pulley?

If you recommend going back to 40, I will go that route

Garden State, NJ

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04-04-2017 04:29 PM  3 months agoPost 25
Notar

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Taxachussetts

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Go to 300kv with 12s but change the pulleys back to 40.
Joe

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04-04-2017 05:20 PM  3 months agoPost 26
aashu

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scotch plains, NJ

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thanks

Got it.

thanks

Garden State, NJ

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04-04-2017 10:35 PM  3 months agoPost 27
aashu

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scotch plains, NJ

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hi

Ordered a KDE 295KV. Will keep posted

Garden State, NJ

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HelicopterScale Model RC Helicopters › Need help with weird tail vibrations
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