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T-REX 500 › What dampers to use with mini v-bar?
05-11-2011 04:36 AM  7 years agoPost 1
flyride

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Salt Lake City UT

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I just put a mini vbar on my trex500 that had a 3G on it and now I have a slight head wobble/bobbing in a hover (have not flown FF yet) and have heard that the 500 with mini vbar likes a softer damper so what dampers is everyone with this setup running? Now I have the black ones but was wondering if the softer grey ones would do the trick..

and the blonde said "RECTUM, Hell damn near killed em!!"

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05-11-2011 07:37 PM  7 years agoPost 2
jandrews

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Houston, Texas USA

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The wobble is probably due to the mini v-bar picking up vibration from the heli. I had a big problem with this when I mounted my mini v-bar on the gearbox / support for the tail boom, and posted some comments about it on RR. The v-bar software that analyzes vibration levels is very helpful for diagnosing this. As for dampeners I have not tried softer ones but did try stiffer ones and did not like them.

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05-11-2011 11:12 PM  7 years agoPost 3
flyride

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Salt Lake City UT

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When I run it up with the main blades off and hooked up to the computer I don't get alot of vibrations and if I bump my speed up to 100% the bobbing is reduced to almost nothing but I can still see it a bit that is why I was wondering about the softer dampers and have heard the 500 with mini vbar like softer dampers. What dampers are you running and which ones did you try that you did not like ( harder ones)? I have the black align ones on but was thinking of using the grey align ones that are 70.

Out of curiosity how do you know what is vibrating with the analyzer is there a chart or something somewhere that says if it is this frequency check this etc.

and the blonde said "RECTUM, Hell damn near killed em!!"

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05-12-2011 02:05 AM  7 years agoPost 4
snjbird

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Kissimmee, Florida- USA

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I'm using the gray 70* damper. all others give me a bobble on elevator stops... Stock up though, cause it will eat them!

I have tried the Flying sport, Trueblood, KBDD, Align 90*, Align 80*... the Grays are the best for my flying style.

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05-12-2011 02:27 AM  7 years agoPost 5
flyride

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Salt Lake City UT

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Are the grey good for 3D?

and the blonde said "RECTUM, Hell damn near killed em!!"

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05-12-2011 03:33 AM  7 years agoPost 6
snjbird

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Kissimmee, Florida- USA

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05-12-2011 04:24 AM  7 years agoPost 7
jandrews

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Houston, Texas USA

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I'm using the Align black dampers H50022 and like them. I tried the "Flying Sport New 3D Damper in LIGHT YELLOW" sold by Heli Hobby and thought they were way too stiff.

My mini V-bar is now mounted on the lower tray of my T-Rex 500. Mr Mel has posted tips at his website http://heli.dacsa.net/MrMelSite/index.htm and elsewhere about the spectrum analyzer. Here is a video: http://www.youtube.com/watch?v=4fe8rFxQcD8. Look at the frequency of the highest vibration and that will help to identify the source of the vibration. Lower vibration is better. Compare different locations and mounting methods and pick the one with the lowest total vibration level. Mr Mel wrote that usually hovering stability problems are due to the vibration levels being so high that they overwhelm the v-bar.

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05-12-2011 05:40 AM  7 years agoPost 8
flyride

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Salt Lake City UT

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I did watch the video but he saw a spike and said it was the tail, How does he know it is the tail not the head etc. Basically how do you know what is vibrating just by looking at the spikes?

snjbird

Nice flying, if you can do that on grey dampers I will be fine.

and the blonde said "RECTUM, Hell damn near killed em!!"

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