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Old 04-13-2012, 02:10 AM   #1
oalhindi
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Default new plane requires Lots of elevator in a Hover ?

Hi,
I just got a new plane ( Extra 330sc ) and it is hard to hover. It’s wants to fall towards the belly quickly and requires a lot of elevator to keep it up.
I have other planes that hover with almost no Elevator to some, But this one is a hands full.
Does anyone know why this might be happening ? and how to correct it ?
also in a verticle clib it goes towards the belley a lot. when moving the CG forwards it goes away but then its nose heavy

Could it be the down thrust or incidence

I appreciate anyone’s help
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Old 04-13-2012, 09:39 AM   #2
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So after trimming it for hands off straight/level flight, what does it do on an inverted 45deg upline? How's the elevator trim after trimming for straight/level ? Did you check the incidence when you put it together?
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Old 04-13-2012, 09:57 AM   #3
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What type of extra,engine size,a little more info maybe?
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Old 04-13-2012, 10:40 AM   #4
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sounds like its maybe the thrust angle is off.
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Old 04-13-2012, 02:51 PM   #5
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Ehen I go inverted to a 45 line it goes staight for a bit and the slowly goes towards the canopy. not to bad on the CG.
my incidence shows that it is around 0-1 degree. I'm using the 4 in 1 digital incidence meter and there is a play in there.
all of them have that play. I have 2 of them and couple of my friends do too.
i'm going to try increasing the up thrust with one washer and see what happens.
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Old 04-13-2012, 02:54 PM   #6
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did anyone experience this before ?
I have a 50cc reactor as well and it does the same thing in a hover. and both planes in a vertical line go towards the belly.
my other planes like the OMP yak 50cc is just perfect. here is a video so you can see the way I fly. not a beginner but was just surprised with this new plane.
http://www.youtube.com/watch?v=Q-CIt-Mq6NU&feature=relmfu
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Old 04-13-2012, 09:37 PM   #7
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Change your CG, not the upthrust. CG will change how an airplane hovers. My first Carden was stupid nose heavy, and hovered hands off. Once it was locked in, it was all over. It would actually torque roll by it self.

Also, fly numerous up and down lines, directly in front of you.

If engine incidence is off, fly full throttle and pull the throttle off. If the airplane climbs with throttle removal, you need to add a touch of up thrust. Opposite if it dives.
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Old 04-13-2012, 10:00 PM   #8
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so to hover it would be better to have it tail heavy right ?
but I tried this and the plane becomes real snappy.
is there something I can do ?
thanks
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Old 04-14-2012, 04:54 PM   #9
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It don't have to be tail heavy. Neutral to slightly nose heavy will be fine.
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Old 04-16-2012, 10:02 PM   #10
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One more thing to keep in mind is that some planes like to hover slightly laid back. I think that you may have just not found the sweet spot on your plane.

My 110" EF Yak will hover straight up (vertical) where as my 125" EF Extra will hovers the best leaned slightly towards the canopy. I think its just the flight characteristics of the planes. Both planes are balanced right on the cg and are really close to neutral upright and inverted.
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Old 04-16-2012, 10:16 PM   #11
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Thanks. I will try that tomorrow or the day after if the wind is calm so I can get an idea if that makes it better
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Old 04-18-2012, 11:17 PM   #12
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I have recently had some help setting up my plane properly for the first time and I could not believe how much better the plane flew. our local gun pilot gave my Yak a shake down, flying vertical up lines and down lines. If the plane pulls to the belly, put in some up thrust. once you have this sorted concentrate on the downlines. We had to add one or two clicks of down elevator because the Yaks wing incidence was slightly out. You could try to fix the incidence, but I couldnt be bothered cutting up a new plane.
once the plane was perfectly neutral in the vertical up and down lines, we tried level flight. had to hold a little back stick for level flight but it was exactly the same for inverted. I find this to be a perfect set up for IMAC. C of G is also neutral.
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Old 04-19-2012, 12:23 AM   #13
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thanks that helps, I will try that.
Now when you measure the CG and do an invert 45 degree, What is your throttle settings ? is like full, half, or 3/4 throttle.

thanks
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Old 04-19-2012, 07:29 AM   #14
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my throttle setting is normally 3/4 to full.
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