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« on: February 18, 2010, 12:03:12 PM »
sk010962
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Ok finally got all the spare Grin, but did not have the right tools  Bang Head, but managed to change the broken bent parts  Clap. Replaced the tail boom, flybar, feathering shaft and couple of push-rod linkages.

I still have to work on the heli to make it perfect.
I have verified that the pitch is zero on idel up and mid throttle.
The fly bar paddles are all parallel. Also equiv distance from the centre.
Blade tracking and verified that both blades are on the same plane.

My issue is that I need to constantly apply forward cyclic and left roll to keep the heli hover at one place.  Help Me
I have used the trim to max on the forward cyclic and almost mid trim on the left rool.  Giggle

So my question is what have I over looked or missed. I do not want to use trim and want to fine tune it for a perfect hover. Any thoughts suggestion please Salute

Below are the video of the test hover. It was bit windy in the morning.



« Last Edit: February 18, 2010, 12:08:47 PM by sk010962 » Logged

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« Reply #1 on: February 18, 2010, 12:04:46 PM »
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Heheheh just forgot to mention it was at the very same place that I initially crashed my heli head frist while learnign to hover Giggle Wink
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« Reply #2 on: February 18, 2010, 12:19:24 PM »
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Heli=Diff parts flying together in close formation



You forgot CG (center of Gravity ) make sure that the Heli is well balanced, put some weight on the nose to make it parallel to the Ground while holding the heli through fly bar's + . let me know if you need a full explanation

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« Reply #3 on: February 18, 2010, 12:42:10 PM »
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My issue is that I need to constantly apply forward cyclic and left roll to keep the heli hover at one place.  Help Me
I have used the trim to max on the forward cyclic and almost mid trim on the left rool.  Giggle

So my question is what have I over looked or missed. I do not want to use trim and want to fine tune it for a perfect hover. Any thoughts suggestion please Salute

Clearly indicates that your swash is not level.  You can use the standard techniques to fix it, like rotating the servo arm on the servo, adjusting the linkage length, adding sub-trim in the radio etc. Start with no trim and no sub-trim on the swash servos.
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« Reply #4 on: February 18, 2010, 02:14:55 PM »
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hmmm CG will check it out... swash level... I just did eyeballing to ensure it was paraller to the ground. But will double check on that again when I find time to fly over weekend. I am suspecting that I might be missing on having the flybar paddel parallel. Are there tools to ensure that fly bar paddles are parallel to each other and to the centre hub. I just used a ruller on top to measure that they are parallel.

Thanks again for the quick reply Hellyflyer and anwar. No wonder I love this forum... You are just a click away from all the help you need.
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« Reply #5 on: February 18, 2010, 02:22:18 PM »
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Great to see another person join Helis. Now we are 5 newbies at nearly the same level of flying !!
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« Reply #6 on: February 22, 2010, 08:19:09 PM »
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Sorry, missed out this thread. Good to know your Heli is back to hovering. Thumbs Up Its a bit dangerous though to hover in such a small place. >Cheesy
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« Reply #7 on: February 22, 2010, 08:51:45 PM »
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I am suspecting that I might be missing on having the flybar paddel parallel. Are there tools to ensure that fly bar paddles are parallel to each other and to the centre hub. I just used a ruller on top to measure that they are parallel.

You can get flybar paddle gauges (like pitch gauges) that come in pairs.  Visual inspection works very well though, as long as you can line it up with with the "fly bar cage" (the rectangular structure through which the flybar passes through).

BTW, for the above issue, the fly bad paddle would be less of a suspect than the swash levelling itself.
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« Reply #8 on: February 23, 2010, 12:47:53 AM »
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hi mate,
 dont buy paddle tool. not needed........but...................... you say you 'eyeballed'the swash level............ there is your mistake I expect.... get the swash level tool, 0.5mm out is enough to stop a good hover..........
never eyball the swash, always set it with tool. this is the start point of 'all' your setup............everything else depends on a well set swash plate.
 oh and not bad there, I learnt buy staying 'low' and smallish area [be safe though] it is harder as there is more turbulance at lower level .:-)
regards
don
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« Reply #9 on: February 23, 2010, 10:28:52 AM »
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Thanks Don... yep have ordered one...
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« Reply #10 on: February 23, 2010, 11:09:29 AM »
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There are other simple techniques to ensure the swash is level.  One simple suggestion (assuming you have a pitch guage) is to ensure that the pitch on one of the main blades is constant when you check it at 90degree intervals of rotation (Rajesh suggested this).

There are various other techniques using bubble-levels also.
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« Reply #11 on: February 23, 2010, 11:47:20 AM »
sk010962
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have a pitch guage...and couple of bubble levels pulled out from old tapes and measures... I finally got all the plliers and hex drivers, will check on the 90 o suggestion... I again pulled the head assemble out to verify if there was any bend on the main shaft ... so sure will check on when I putting it back together....
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« Reply #12 on: February 23, 2010, 12:19:45 PM »
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what is sk010962?
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« Reply #13 on: February 23, 2010, 01:09:07 PM »
sk010962
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good question vinay Grin ..... it just happens to be my employee id Giggle in the company that I work for.  I am really bad at remembering different userid on different forum and sites... so anything that does not take email id as login... I have a common login user id: sk010962. 2 advantages... one I am always sure that no one else will have the login id  Thumbs Up and second I cannot forget the id as I have been using it to login every single day for the past 5 and a half years  Wink
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