Ok, I just bought a ready to fly H9 Extra 330L, with a 3W85 twin, and 8411's all around. Now just as soon as it was delivered, I hear about it not being flightworthy without a few mods to the wing. What is this!?! Mine is the 4 servo wing version, whats wrong with the plane?

I would however, Like to convert the wing mounting from "4-40 screws into the tube", to 1/4-28 bolts from the inside of fuse. I'm sure this has been done, what is the best method for this? How much stress would there be that could be harmful?

Is there anything else I should know about this model before I finish and fly it? Any help is appreciated! Coulter

Hi Coulter--It seems there was a problem with the early models and aliron flutter. H9 then modified the wings to accept 2 servos per aliron and this was suppose to correct the problem. They at one time put out a customer service bulliten on the website I think. I don't know if it is still there but I would sure call them. (better safe than sorry, ya know)

Why would you think there is a problem with the 4*40 screws in the tube? Its to hold the wing pannels from pulling out, so if the screws are inserted properly, then there is no problems. I have never encountered any problems yet.
But if you must, then you should look at Dick Hanson's web site, he has a good method for this.

I just prefer to have bolts from the inside of the fuse, rather than bolting from thr outside into a tube. This way, I can tighten the wings inward, that reduces the space inbetween the wings ad the fuse, I think that eliminates vibration. I have seen other H9 330L's with this mod, and I like it much better (as do the owners)...

I did a Google search and could not find anything about the wing bolt mods from Dick Hanson... Does anyone have a url? Thanks

try http://www.concentric.net/~Dhmodels/workshop.html

You will have to click on the H-9 33% Cap to see the wing hold on method,but it works the same for the Edge.I went through the effort on my Edge to mount the wing from the inside and it worked fine,but on my Cap I used a peice of hardwood dowel epoxied into the end of the tube,driled and tapped for the 4-40 screw,and it works fine,and a whole lto eaiser,but to each his own,either works fine.

So do you think one bolt from the inside on each wing should be enough to hold them in? I am thinking of putting them smack directly behind the wingtube. It seems to be a pretty solid area??

What are your thoughts?

I've been using the 4-40 bolt method and it has worked fine for me. And it is simple. I read where a fellow was worried about the security so he modified it with a 1/4 20 bolt and nut thru the root rib into the fuselage. well in flight the nut vibrated loose and the wing moved out enough to disengage the antirotation pins and the wing rotated and the plane was lost, so be careful if you do decide to try a different method. Also mine flys fine with one 8411 servo per aileron. The bad rep this fine airplane got earlier on is great because now those of us who know better can buy them cheaply. Enjoy!

I've been holding the wings of my H9 Extra together with VELCRO.
The opening in the wing is so large that I epoxied a 1/2 inch plywood piece in there, vertically behind the root rib.
I then make a loop between the 2 wings with a long 1/2 inch velcro ribbon, with the overlap being slightly smaller than the fuse width. To add extra tension, I then pinch the velcro loop close to each wing with another small velcro loop (that is also used to capture the servo wires and hold them together).
I've been using this technique for over 2 years now, never a problem, light, reliable and strong enough.
Ben