Phoenix Sukhoi Su31 1.20 size ARF.... a non-official review. - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 08-29-2004, 09:50 AM   #11
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The problem is ANY flimsyness ANYWHERE will cause flutter.
Not just the elevator, but the whole stab can flutter! (in fact, whole WINGS!!)
(I believe this happened to Gary Maker)

When I inspected this plane, it was obvious to me that this was a potential problem.

In answer to the poll, no one thing can eliminate flutter.
Any one thing can cause flutter.
Unless you eliminate ALL the problem areas, you could have a flutter problem.

As I stated in my earlier post, providing everything else was tight, yes, I believe the flimsy stab was the problem in this case, and yes I believe the flying wires could have prevented it.

All surfaces will try to flutter at some speed, and the higher the speed, the worse the problem.
What we must try to do is make everything as solid as possible in order to increase the speed at which the surfaces will begin to flutter.

To get some Kevlar, you can buy the Sullivan Kevlar pull-pull system for about $12.
You will also get some fittings with it that you may be able to use to install it.
You could also just thread the Kevlar through the surfaces, and ca in place.
Ron Mattiuz

Flying Tigers RC Club
"Flying an airplane is just like riding a bike...except it's harder to put cards in the spokes"
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Old 08-29-2004, 10:07 AM   #12
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Hello Gus,

I have a photo of the landing gear, does not look the same set that you have.

Hi Gary, do you have the samr set? Thanks

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Old 08-29-2004, 10:33 AM   #13
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On my Sukhoi I believe it was a combination of the flexable control horns and a weak stab. Had the stab been setup with flying wires, I don't believe I would have had the flutter I had at only half throttle and at straight and level flight.

There is absolutely no way I would trust that stab without the flying wires. If your on a tight budget then it will be far cheeper to add the wires now than to have to do extensive repairs when your stab fails and I do believe it will fail! I was lucky I was only flying somewhat slowly at the time my stab broke or I would have done some serious damage to the whole plane and perhaps worse!!!

SERIOUSLY....YOU NEED TO ADD THE FLYING WIRES! Its not that expensive to do. A couple of lengths of wire and 4 clevises will do the job! You gotta have that much kicking around the shop somewhere??

Ron knows what he's talking about. He has a lot of experience with airplanes and is definitely only trying to help you avoid disaster!
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Old 08-29-2004, 10:51 AM   #14
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Go back and look at Gus's photos again... those are exactly the same gear and yes it looks like mostly fibreglass with only top & botom layer of CF.

If I were you I would go to and buy some real CF gear. Mind you do not expect these to be idistructable either. I had a pair on my CG Extra and after about 15 REAL hard landings, dorks and smacks my gear delaminated as well.

I think we are expecting too much from CF Landing Gear. It will not compinsate 100% for bad or outrageously hard landings. What it does have over AL gear is though it does not bend out of shape until it fails and it's a lot lighter!

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Old 06-05-2005, 03:57 PM   #15
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Phoenix 120

I just flew my Sukhoi Phoenix . Before flying I upgraded to 440 pushrods installed Hi Tec metal gear hi speed servos...installed tail feather wires and balanced at the required 145 mm balance point with a Saito 150 and I could barely control knees are still knocking..but i made a hard landing and guess what..cracked the landing gear...repaired with an aluminum sub plate that extends about 3 inches down the underside of the landing gear...and then tie wrapped it to the carbon fiber legs...seems to be sturdy enough..but not over kill. Not sure why i was having so much trouble controlling it..had the throws set to what the manual required, some of my fellow club members seem to think that the controls are to high and I should reduce I did...have not flown it yet...could anybody give me some input?
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Old 06-08-2005, 05:55 PM   #16
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Difficult to say why but.... maybe the CG is favoring the tail and it makes it unmanageable, which an aerobatic plane should be. Make it nose heavy and go from there.
Once my hands and knees stop shaking I take the planes out of the car.
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