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HomeAircraftHelicopterMain Discussion › HOVER FLUCUATION
09-07-2013 04:34 AM  4 years agoPost 1
BENTDABOOM

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west seattle

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been noticing few times will get in a nice hover ata constant throttle position and the model wants to go up/down, nothing fast it just wont hold still, whats that all about?

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09-07-2013 04:46 AM  4 years agoPost 2
TMoore

rrMaster

Cookeville, TN

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Is there any sort of wind present? Are you running a governor or limiter?

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09-07-2013 04:50 AM  4 years agoPost 3
AWittleWabbit

rrElite Veteran

O.C., CA

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"Translational lift"

Any breeze however slight will cause a climb from a steady hover. Any reduction in that breeze will cause a descent.

And potentially,

Are you flying glow? Small changes in head speed can cause that too.

I'd like to stress though, it's primarily translational lift. You'll always have to fly both sticks constantly.

And in the fantasy dept.,

Electrics start climbing because they burn up them electrons thus becoming lighter

Heli-itis sufferer.

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09-07-2013 04:50 AM  4 years agoPost 4
Brian B.

rrApprentice

Marion, Iowa

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Check all of the links to make sure there is no binding. Check and see if there is any binding up with the bearings in the grips or any bell cranks (depends on what heli you have).

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09-07-2013 02:45 PM  4 years agoPost 5
BeltFedBrowning

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Kansas City

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Everyheli I have ever owned did this up/down movement in a hover.

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09-07-2013 03:10 PM  4 years agoPost 6
jschenck

rrProfessor

La Vista, NE.

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With the Raptor you fly this could also be caused by some slop in the collective arm pivot. One way to help is glue the sleeve onto the screw that makes up the pivot arm point.

What servo do you have on the collective? It needs to be strong and accurate.

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09-07-2013 04:17 PM  4 years agoPost 7
BENTDABOOM

rrKey Veteran

west seattle

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I got this model dirt cheap all it needed was a radio so I couldn't pass it by! came with S148 which were good enuff to get me hooked again, I realize thier low grade
and prolly time to get some decent servos especially upgrading to a 50.......now heres the good part,we have a V2 coming so things are looking up, anyway will check that linkage thing out,also might be time to look at govenors, thanx for the replys

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09-07-2013 05:03 PM  4 years agoPost 8
Four Stroker

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Atlanta

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The S148 will only last a total of maybe 30 flights anyway. There was once a lot of experience with S148's in Raptor 30's and such.

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09-07-2013 06:19 PM  4 years agoPost 9
BENTDABOOM

rrKey Veteran

west seattle

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no doubt the 148s are throw aways,however thiers no slop on the output shafts, like I said they'll get me by until the 50 conversion

schenck, checked all the control linkages and their is no slop anywhere

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09-07-2013 08:59 PM  4 years agoPost 10
keiser BLADE

rrApprentice

WV USA

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Is ur blade tracking correct. Both at 0 in mid stick , starting out a long time ago my blades were pff and the copter yo yo d

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09-08-2013 12:37 AM  4 years agoPost 11
BENTDABOOM

rrKey Veteran

west seattle

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not using that 0 midstick thing yet till I have time to really study it,Im one of those oldschool -1 +6 +9 flyers .the blades I was complaining about turned out to be bad but I got it to track, but still flys like $--t even after tracking, just gotta find some decent 550s

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09-08-2013 02:21 AM  4 years agoPost 12
NQNA

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USA

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+1 AWittleWabbit

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09-08-2013 02:48 AM  4 years agoPost 13
BENTDABOOM

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west seattle

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agreed however it was dead calm, I can see it happening with a breeze

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09-08-2013 05:15 AM  4 years agoPost 14
BeltFedBrowning

rrKey Veteran

Kansas City

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I remember how much better my Raptor flew with my first set of carbon blades!

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09-08-2013 05:58 AM  4 years agoPost 15
Einzelganger

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Campbell, Texas

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S148's never have seemed to me to be very good at centering. Flown a million on planks and even once used one for a tail servo on a Raptor 50V2. Needless to say that didn't last long. lol

That would be the first thing to change if it was me.
And a big YES to the carbon blades.

Wayne

I love the smell of nitro in the morning.
RIP Roman

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09-08-2013 05:42 PM  4 years agoPost 16
BENTDABOOM

rrKey Veteran

west seattle

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I got some 600 woodys comin for initial flight after the 50 conversion and some 600 glass for consistant sport flying, Im sure will see a real difference! also gotta killer deal on a V2 with some decent servos so will be using that one for the 50 conversion instead of the V1, that's if I have all the right parts, so hopefully will get that in the air next week

other than that whats the deal with these govenors, say I was at 1/2 throttle wouldn't the 1/2 throttle stay their w/o a governor?
maybe someone can enlighten me on that

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09-08-2013 06:28 PM  4 years agoPost 17
Einzelganger

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Campbell, Texas

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A governor will keep the blade rpm wherever you want it (depending on your engines ability).
You will set a linear curve in "Normal" which gives you rpm control on the way up the curve until the threshold rpm is hit. Once there, it will hold that rpm until you come down the curve past that rpm threshold. This keeps your rpm steady at hover and slow FF. From there, you can bring the engine and pitch control down to idle/negative pitch in "Normal", usually for landing.
In "Idle-up", you set your throttle curve to a "V" shaped curve and usually a higher rpm setting. The V-curve in the radio tells the governor that full negative pitch does not lower the rpm and the governor then works to keep the rpm constant for inverted hover, full positive pitch, and full negative pitch. This will go on until you switch back to normal which will allow you to land and spool down the head. You can land in "idle-up", but when you lower your throttle stick, your engine will increase to full power at bottom setting and increase negative pitch to max. (Can be kind of exciting when you brain-fart and do this.)
I won't fly without one. All you do is set your engine to where it is happiest and you are done. Hope this helps.

Wayne

I love the smell of nitro in the morning.
RIP Roman

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09-08-2013 06:56 PM  4 years agoPost 18
BENTDABOOM

rrKey Veteran

west seattle

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set your engine where its happiest? you mean needle adjust? would like to fly with one to see what you mean

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09-08-2013 07:31 PM  4 years agoPost 19
Einzelganger

rrKey Veteran

Campbell, Texas

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Yes, needle adjustment.
Happiest for me = combination of most reliable and best power = somewhere that transitions well and is not too lean.
Best platform for the governor to do it's job.

Wayne

I love the smell of nitro in the morning.
RIP Roman

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09-08-2013 07:47 PM  4 years agoPost 20
jackp332

rrKey Veteran

Claremont, Nh USA

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Definitely agree that a good set of carbon blades and a high quality metal-geared set of cyclic servos are an excellent investment to cure your yo-yo woes. Those were the two best upgrades i made to my Raptor50 that yielded noticeable results you could see and feel- not just 'bling'. Also a few things to consider in your radio setup- 1 if your throttle curve is steep (pitch comes in and increases quickly) it will be very difficult to hold a steady hover no matter how smooth you are. 2- a higher headspeed will make the machine much more sensitive to collective inputs. (I trained at about 1600rpm for learning and smooth scale like flight) 3- Is the collective stick on your radio ratcheted or smooth? The ratchet action found on many non-heli specific radios makes a smooth hover very difficult to achieve as well. Good luck and glad you are back in it.

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