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Model Forum / Radio Controlled / Helicopters / February 2005



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Vibration problem - resolved?

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Gerard - 23 Feb 2005 11:05 GMT
(new thread for technical reasons!)

Thanks to various posters with useful suggestions.

Unfortunately the heli was vibrating madly again*
today, so much so that I bit the bullet and just
took the gear off.

The heli behaved quite well and was far more
predictable without the training gear, though naturally
I just kept to some pretty tame tail-in hovering.

Thanks to Stefan Kunde for Reflex XTR! I'm by
no means "there" yet but at least I didn't crash it! **

Gerard

* I suspect the RPMs are too high at hover, as
it is taking off at below the mid-stick level, and
that this has been contributing to the vibration
problem. Obviously I have discovered an unhappy
combination of system resonant frequency and
engine/rotor RPMs.

** Now if he can only simulate the sphincter factor
associated with the imminent prospect of destroying
a $2000 *** heli or decapitating oneself or one's 4-year old.

*** Yes, really. Australian dollars, anyway. We're a
long way from civilisation.

**** This is an unreferenced footnote. Furthermore,
there are no more footnotes.
RV - 23 Feb 2005 12:05 GMT
>(new thread for technical reasons!)
>
[quoted text clipped - 19 lines]
>combination of system resonant frequency and
>engine/rotor RPMs.

No mystery.

Just cut an inch off each leg and screw the balls back on, problem is
common as dirt and that solves it, if not another inch and itll be
sorted..

Many have had it, the trainer leg packet says nothing about it, some
guys toss batteries out in the shaking and smash up the fukin heli
before theyve even landed it once.
I knew one guy here in Melb who did that twice, second time it hit the
fukn back shed and chopped up the wiring on the heli, as well as
smashing it to a pulp.
He finaly found out about chopping the legs a bit on the third Heli
build and had no troubles.
He was pissed he didnt find out sooner.

Others are just in for a change of undies after seeing it shake like
fuk it it doesnt throw off any important parts.

3 snips, all solved, RC helis can be a problem child, read a lot.
You can learn it all on your own, but it genrally causes injury and
insult when you smash up sh.t and then find out later you could have
avoided it.

Best way to get that sort of info is in some of the Forums and for
local consumption (I assume by what you say below you are from Aus) Id
suggest our Aus rc forum at www.archeli.com

>** Now if he can only simulate the sphincter factor
>associated with the imminent prospect of destroying
>a $2000 *** heli or decapitating oneself or one's 4-year old.

You can run away from an out of control heli, your 4 y old kid cant,
these aint toys.
When you trash your heli for the first time youll wonder why you had
anyone within 100ft of the thing before that.
They are like a small exploding tornado in the middle of the backyard
when you loose it and the rotors hit...whatever they hit.

Some parts go north, some go east, others go west and south at various
distances from 1 foot to 100 ft away from the spot where the heli used
to be flying.

Im my case (my 1st nasty) a lemon tree, that came off better than the
heli.

Speaking of backyards, its a no no here with CASA, so if your is
suburban Id suggest you find some place bigger to fly.
Being RC helis we kinda stick out and CASA gets calls from locals.

Local parks are a bit risky but mid week some are fine, beware of
councils on that though, some parks are ok for rc but some none at all
in the municipality.

The simplest would be to join a club and get help and have a place
that is setup for rc helis and always legal to fly.

See the list of clubs in Aus at archeli link above

>*** Yes, really. Australian dollars, anyway. We're a
>long way from civilisation.

We are closer to Hong Kong however and thats where you should be
buying parts from you may not get at a decent price here
Cyberheli

Rgds
Dave
Gerard - 23 Feb 2005 13:11 GMT
Thanks for this,

I'm flying at a CASA approved venue. I sent my
club membership application form & fees a few
weeks ago. My principal difficulty in this regard
is that I am flying mode 2 and most locals use
mode 1.

I was being a bit facetious about the 4-year old, pointing
out that the simulator is good, but the real thing has
consequences when you crash it.

(The four-year old stays behind the flight-line. If he's
not behaving I drop the heli, kill the throttle and then
deal with it. I very much appreciate it is not a toy!)

The principle mystery about the vibration thing  is
why the thing behaved so well on the first few occasions
and then started to vibrate subsequently.

Cutting the gear shorter is certainly something I'll
get around to doing, but for the moment I'll
probably just not use the training gear.

Thanks for the pointer about purchasing from
HK.

Gerard

>>(new thread for technical reasons!)
>>
[quoted text clipped - 88 lines]
> Rgds
> Dave
RV - 23 Feb 2005 14:46 GMT
>Thanks for this,
>
[quoted text clipped - 3 lines]
>is that I am flying mode 2 and most locals use
>mode 1.

Ignore that, the old codgers always try to con you into the old ways,
fly mode 2, most of us in recent yrs do in Aus.

>I was being a bit facetious about the 4-year old, pointing
>out that the simulator is good, but the real thing has
[quoted text clipped - 3 lines]
>not behaving I drop the heli, kill the throttle and then
>deal with it. I very much appreciate it is not a toy!)

Good

>The principle mystery about the vibration thing  is
>why the thing behaved so well on the first few occasions
>and then started to vibrate subsequently.

Yeah it gets pretty wild after a short hover.

>Cutting the gear shorter is certainly something I'll
>get around to doing, but for the moment I'll
>probably just not use the training gear.

Whatever your comfortable with.

>Thanks for the pointer about purchasing from
>HK.

Dont fgt to check out

>> suggest our Aus rc forum at www.archeli.com

Cheers
 
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