The shape of the leading edge has alot to do with the way a airfoil reacts in the air. The way I understand it a more blunt leading edge helps make the wing more stall resistant. If the shape of the wing on one side is different it will make one side stall before the other or in other words snap. The elevator on the Edge 540 is very efficient at stalling the main wing for 3D but if the wing does not stall evenly the plane will snap.

Years ago we used to put stall strips on the leading of some pattern designs to make the wing stall and snap better. The strips were traingular shaped wood pieces glued to the leading edge to give it a sharp shape instead of blunt.
If you don't get the airfoils the same or close to the same it will have definate effect. I really thought this was going to be the problem, but within my ability to measure the leading edge and airfoils, they are the same.
I still believe my problem and those who have had the snapping problem have warped wings. I am going to twist some washout into my right wing.
Yes the nose weight should not be there. I was chasing the wrong cat with that one and that is why the problem remains with the additional weight.. Normally, this nose heavy, a plane would be so elevator insensitive all landings would be carrier landings. ie, no flaring ability. Mine still snaps with all that nose weight and less than 3/4" total elevator travel. And every landing is a controlled crash. I just have to have the snap at the point of contact with the ground,on every landing, you can see it start to break as it touches down.
I can't get this Edge past the snapping to get into 3D or High Alpha. It has to be the wing.
steve again

we still put trim tabs as theyre called near the ailerons these days..... for a similar purpose, although i think they're more for correcting deffering wing panels.

I replyed at the top of this thread..Just wondering..How are you going to twist this wing..

Scott

I put it under my left arm and braced the part sticking out behind me against a door jamb. I held the heat gun in my right hand and twisted the tip of the wing with my left hand as i heated both top and bottom of the tip. You can see the ultra coat loosen and feel the structure twist . I just put a little in. I'll try that and see what happens. I may want more or I may take out what I put in. Have to fly it now to see.
steve

interesting,

im going to order my engine and servos next week hopefully

man i swear you can learn something more every day in this hobby

I had the same problem with my edge. I am running a YS 140 and balanced my edge to the book specs. After several near fatal landings I went in and changed the cg. Now it is a whole new plane and enjoyable to fly. I have read the other posts about a warped wing and the like but I will bet the cg is all that needs to be corrected. I think that if you set the plane to balance on or slightly behind the red trim strip at the wing tips you will find your problem solved. In my case after moving the battery pack all the way to the fire wall I still had to add some led to the nose as much as it pained me to do so. My edge now weighs in at 12 lbs 6 oz. I hope this is of some help to you.

Shortman,

What engine and servos are you planning on using?

OS 1.60FX with Jett In Cowl Muffler


Hitec 5645 digitals in ailerons

and Hitec 5945 digitals on rudder and elevator

Good luck with it! Haven't heard of the Jett muffler, let me know how it works for you.

ill tell u how it goes

hmmm have you guys ever heard of dont use full rates with a
"3D" plane at normal speeds because it is used for extreme stuff not landing. i have an os 160 in mine and it lands like a feather. harriers are easy too

Just to confirm, in the case of my buddy's airplane, his rates weren't at 3D when the trouble was encountered....The airplane was set up with conservative rates as a "Just in case" measure. This was not a case of inexperience, although I do believe the airplane probably had a set up problem. It has got too much praise in this column to believe anything else....haha. Glad to hear that actually! Couldn't believe that H9 would market something that flies as bad as this airplane did....haha

Chris

hey wild3dfunfly, read the posts! my rates are below the recommended low rates, and i have expo on them as well. There is no way to get even close to 3D rates or even high rates! My opinion is there was batch of bad wings produced and those of us with the problems have the bad wings. If you got a true straight wing, no problems. The snapping problems are all from airfoil variances or twisted panels or something along those lines, or maybe the wing is flexing in flight. I know after 5 or 6 flights my covering is stretched and i have to reshrink. This last time all the wrinkles, in the right hand panel only, were at a 45 degree to the leading edge all in the same direction. If I twisted the tip backwards, all of the wrinkles left, interesting, huh? I believe the structure is twisting in flight.

On the whole I felt that mine flew well, but the cost was over the top, and the build and job of covering was all very poor indeed. A friend had to highly modify the rear of his to make the stab fit horizontly, and in the process found that small pieces of scrap had been used as spacers inside the construction.... I've had far better quality for half the price with Kyosho!

My Edge was easy to land but if I tried to pull even a big loop it was hard to stop a tip stall.

My Egde weighs in a 12lbs with a Saito 180.

After checking everything I decided the left leading edge was much flatter than the right one. Horizon indicated I should take off the covering and shape it like the right side. This I did.

The airplane will only tip stall now if you really force it. I love flying it.

RSN

Just for the record! While i was waiting for the new wings to come in ( after the recall). I modified the original ones and flew my edge and it was a little snappy but as soon as i got the new wings it was miraculously gone!!!!! So after reading this post i bo look at my first set of wings hanging on the rack and whooaa
the right wing is squared on the leading edge and the left is well
rounded.

now i am a believer in the guy that said this was the problem because the new ones are both rounded the same.

flys great!!!!!!



Got to go fly my Edge

Planeiac

Ok....My Edge(H9540)has gone through 3 owners I am the third.When I got it it Snapped like crazy..I mean Really Snapped enough that on my 8th flight is snapped in to the ground and broke the fuse in two different parts that was the second time this plane has broke into two pieces. and The other two guys Told me every thing is fine... ...So as far as I'm concerned this plane should be as bad as any of the ones you all are complaining about...BUT WAIT The story's not over..I repaired the Fuse All covering off. Moved two servos to the rear for the elevators. ..Incidence IS 0 wing, 0 stab, and 0 Engine thrust line. Moved rudder servo to the back of the open area under
the wing. moved battery under the foreword wing mount..moved 22oz. tank as far back as the compartment allows... OH and lets not forget the Lateral balancing I put it dead Nuts and its the original wing...NOW the final results. It stalls as flat as it can be... I cut throttle slowed to idle flying speed w/Full 3D elevator.it sunk flat and straight down.Harrier perfect and the Wall No Snap what so ever...BY THE WAY the wing has a 1degree twist from tip to tip and the leading edge are far from perfect..MY POINT IS IT TAKES TIME TO DIAL IN A PLANE. I know we shouldn't have to do this but you got the plane so make it work I believe..I WOULD BET THAT IF ALL OF US WENT BACK AND CHECKED WHAT we Say Ive Done that its not right..I have talked to too many people in person and on line and Most say Ive Done That..or Na it is fine that way...You know what if all the steps were fine then the plane would fly Like a Dream........So Please Humble ourselves and double check everything... I am running an OS 160 w/ 18/8 mejzlik prop Have fun.. and you should see the look on the face of both previous owners.

Scott

Skerlock,
So where is your CG after you moved all that stuff aft?

It is at 5 1/4 back

Scott

5 1/4, what is the recommended?

Recomended 4 3/4---- 5 1/4..
I have flown it at 5 1/2 still pretty stable..

One thing though as the CG moves back the thrust line (up / down) becomes more critical....

Scott

Question about the C.G.

My H9 Edge 540 runs the saito 1.80 without any modifications. Believe it or not. I had to add 1 1/2 pounds of weight as far forward as I could (on the motor mount) And still may require more weight. I first flew it without any weight and scarred the hoola out of me... Granted I am knew at the field of aerobatics and 3D but I don't know if I can be off that much... My C.G. is at the spar or just behind the red strip. I heard only one other guy say the same thing and he apparently does not have any problems as well. Any suggestions? Am I really really off? Is this plane supposed to fly like it is tail heavy...

Appreciate any input...

Allendc,

How much elevator throw are you trying to fly with. Low rates should be about 1/2-3/4 inch and no more.

Andy