I just finish (3 Weeks ago) my H9 Edge with a Moki 1.8, CG at 4.75 and about ¼-degree positive incidence, It has dual elevator digital servos mounted at the tail. My problem is that it tends to drop the right wing at the smallest elevator input or flying inverted or worst when you slow for landing the right wing would fall like a rock. I checked lateral balance and my LEFT wing is the heaviest , also check the travel of the digital servos and the arm position and every thing seems O.K. I added a mix of Elevator -> Aileron on the opposite direction of the drop and its helping, but I really would like to know your opinions and possible solutions. I just don’t like the idea of flying my brand new toy handicapped and never getting its full potential .

Thanks to all in advance
Joaquin

Joaquin first off you should not have a 1/4 degree of positive incidence it should be 0 degrees .You need to put your incidence meter on the inboard side of each wing and the run the meter out to the wing tip it should read the same all the way out if you have a twisted wing it would cause the wing to drop as you described. The Cg you stated is fine and you can move it back a little further if you like but do it in small amounts.I hope this helps you.

Hmmm...I'm going to assume that the wing was built straight, and that you have no aileron servo movement when you move the elevator...Is the elevator level? That is, is the elevator in the same plane (geometrical...hehe) as the wing?

I'll also assume that you are talking about a problem that occurs at normal flying speed, and that your elevator throws are not excessive. Excessive elevator throws can cause an otherwise normal airplane to snap at most any speed...

How dramatic is the turn? Are you snapping? Or is the plane making a gradual turn?

edge_fanatic,

Everything, you assume is correct my throws are 9/16" as H9 specs the only thing I have to double check is how straight the wings are, they seem straight.

Wing turning rates:
Flying speed, 60 to 80’ loop slow right turn rate.
Inverted must apply aileron correction all time to do not drop right wing.
Flying speed, apply ¼ elevator input you are ready for a snap.
At landing speed, you have to be very careful on your speed, small elevator input just to control your descent rate, equals wing drop. At this moment landings are a little kamikaze style we use a 600’ paved runway and I’m using around 500’

You have too much elavator throw you only need about half of what the book says for low rate and high can be what ever you want. This is from experience from the 5 caps at out field including mine. I also agree with chance12 on the incidence thing.

When I land I don't hardley even breath on the elavator to control rate of decent I use throttle mainly. I use the elavator don't get me wrong but I touch the stick and don't pull. I also use 40% expo.

Mine did the same thing 2 differnt owners thought they balanced it latreally...it wasnt. I did so carefully and it doesnt do it any more..

Hope this helps

Scott

Scott,


Can you explain your method for Balancing?

I normally hold my plane inverted from the propeller and the tail wheel.

If the snap aspect wasn't present, and you were only having difficulty flying straight in a loop, I'd say the rudder wasn't trimmed correctly...Wit the snap being present, I agree with the others that you probably have too much throw in the elevator halves....

Perhaps you need to trim the rudder also?

My test for rudder trim is exactly what you did with the loop....Fly a loop, making correction with the rudder....If it won't fly a loop with just elevator (assuming no wind), then I correct the rudder...With wind, I am aware that rudder is required to fly the plane through the loop straight.

I am far from an expert....I'm more of a beginner....I've had my edge for only twenty five flights or so.

Just checking here but, when you mixed your 2nd elevator servo to the first, did you use a mix that allowed trim changes and dual rates to the slave as well as the master? Sounds like one elevator is acting differently, is why I ask. I just went through this on a JR 8103 and I had to use specific mixing channels to get the elevators asking the same.
Jack

Jack,

I'm using Futaba 8UAFS Channel 2 and 8 this setup is built in the radio for this app. and works O.K. I measured all movements and every thing on that side its O.K.

edge_fanatic,

I'm going to fly tomorrow and will change the elevator rates and test rudder.

I will keep you informed, Thanks to you All.

Suspend the plane from the rafters or celling...at the tip of the spinner and the top of the rudder..

Hope this helps

Scott

9/16 up and down on the H9 Edge elevator is NOT too much. I use that much, (carefully measured) I have never had a snapping problem with it.
Look for other things as mentioned above.

I also have been flying the hanger 9 Edge 540 for sometime now. Mine shows none of the symptoms you describe. I can slam the plane into a perfect wall and parachute maneuvers without any snap what so ever and this is using 3" of throw on the elevator. From reading your posts I have comeup with a few things to look at.

1. Is you wing truly straight. I say this because the main wing thickness tapers on both the top and bottom of the wing. So when this wing is truly straight it will look to have a little antiheadral in it. I find it easiest to site the wing from the tip of the wing and look down the leading edge of the wing. While doing this also check the curvature of the leading edge of the wing for uniformity. If this wings leading edge is not uniform in shape it can cause the situtation you are describing.

2. Move your CG foward to 4" to 4 1/4" from the leading edge of the wing. Is your plane balloning when you cut the throttle? If so it is a sign of a tail heavy condition which would make the elevator alot more sensitive possibility causing the snapping problem you described.

3. Fix the incidence on the elevator by shiming the mounts to the main wing. The wing and elevator should both be 0 degrees.

4. Check the movement of the elevator halves in relationship to each other. Are they moving together or is one of them moving farther or faster than the other?

Take your time and get these items fixed before you chance flying your plane again. This is really one of the best flying 1/4 scale planes made (especially for 3D) when setup properly. Let us know how things go.

Hi to you All,

Mystery solved !!!

The Zen of the H9 Edge was found when the plane and the ground became one... Just kidding !!!

And the winner is... Mr. sport10; ...While doing this also check the curvature of the leading edge of the wing for uniformity. If this wings leading edge is not uniform in shape it can cause the situation you are describing.

The main problem was the uneven curvature of the leading edge.

I noticed that the to leading edges had an uneven and different profile so I peel off the two leading edges and re-sanded both trying to math a combined profile of two different ones, as you can understand there was not enough material to work out a perfect even profile new on both wings but I do my best. The results were amazing I have a totally NEW & DIFFERENT EDGE this one can land on three points without any wing drop.

To resume, I didn't tell you this before but I was really disappointed with the quality of this ARF, at the assembly stage I found out the hard way that one aileron was about 5/32 in length because I hinged it in the wrong wing after that I had to modify all the stab and rudder support because nothing was fitting in place so I carved out the solid balsa blocks and use fiberglass to mount the rudder and then glued carved blocks for covering the fiberglass work, and this last just confirm it not mentioning what I found on the leading edge after peeling it off.

The quality of my H9 Edge 540 ARF is really poor and for sure its not in the line for the money they ask!!!

Thanks to you all, each of the tips are very helpful
Joaquin

H9 decided to discontinue the model becuz you don't like the quality...hehe

Actually, they did decide that the current production run is the last one, but I am sure you weren't the cause...

Enjoy!

I am glad I could be of assistance. I found the quality of my H9 Edge to be decent. The only problem I found during my buildup was one of the holes that mount the landing gear was off center. Other than that everything came out excellent. I am sad they are discontinuing this model for it is an excellent flying plane. This plane could of been a much bigger hit if Hanger Nine would of controlled their quality better.

I read all your coments about the Edge 540 very good advise I know because it took quit a while to set my 540 up to fly good
realy like the ariplane.