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Stryker Problem - Rolls to the right

Old 07-05-2008, 02:47 PM
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idealhobbies
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Default Stryker Problem - Rolls to the right

Ok, I'm scratching my head here. I built a Stryker to replace my last one, using parts only. Standard Stryker Bare body, Stryker C motor mount, Stryker C Elevons, Styker C Hatches, Standard Stryker Tails, etc... Everything is brand new.

Power system:
Dons Wicked 2700
Heads Up Rc 60amp ESC w/Bec
BMS 380 Mg Servos
Zippy 11.1v 2200mah 20c Lipo
DX6 w/ Ar6000

MODS Done:
Carbon Fiber added to wings for reinforcement (Epoxied in). Very light coat of spray paint. Cut off the fake intakes. Added 2 magnets to the nose for mounting.

Now to the problem... She rolls RIGHT. The faster she goes, the more roll. Now, had it been left, I'd think torque, but it's rolling right... HARD RIGHT. WOT is not an option since the roll is very bad at WOT. I about lost it the first time I went from 50% to WOT. I've trimmed her at 50% and it flies straight and level. Over 50%, the roll is insane. I've trimmed the radio to it's max with little to no effect. I've gone over all surfaces very carefully and cannot find anything at all wrong. I've adjusted the surfaces and even used a ruler to check that they are the same measurement. I've checked the side to side balance, and added 2 small nails in the left wing tip to ensure that the plane's wings are balanced. At the suggestion of Newjak, I checked the thrust angle and made some adjustments in case the thrust angle was incorrect. Did not work. I've shimmed the motor in both directions to change the thrust angle and the roll was the same. I can not "see" anything that would cause the roll.

IDEAS? I'm at a loss.
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Old 07-05-2008, 03:27 PM
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offtom
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Had the same problem with my second build. I think it's just luck of the draw when a bad fuse with just a slight twist makes it out of the factory. Of course then they have them on display in the bags standing on edge so that may help develop the twist sometimes.

All I did was adjust the clevis a bit on the elevon to the right, setting it just a little lower than the left side. Helped out quite a bit but on occasion if I Wasn't paying attention the plane would try to surprise me.

Kind of a basic fix but it worked for me.
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Old 07-05-2008, 05:05 PM
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Tom, I'll give that a try, however, wouldn't the trim be off to the left below 50%? I've looked at the wing and she appears straight. This is driving me nuts. There looks like there is a slight undercamber to the tip of the left wing. About 4" in from tip. Do you think that maybe this is pushing the left wing up? If so, how in the heck do I correct that?
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Old 07-05-2008, 05:07 PM
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Press between a couple of books maybe?
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Old 07-05-2008, 07:30 PM
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Well some folks have taken a heat gun on low setting and had some success bending foam. I've only tried it once and even on low settings I've had foam show it's displeasure at getting warmed up too much.

I don't think the trim should be off under the 50% after adjusting the elevon, because like it is now, the airspeed/wind over the control surfaces is much less so it shouldn't affect them like it does when you take it to 100%. You'll be surprised how little you have to adjust the elevon to trim it out anyway.
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Old 07-05-2008, 08:32 PM
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Hey TS, not to hijack your thread, but how do you hook up the servos to the Rx and get them to activate elevator and ailerons in the Delta Wing mode? I did what the manual says, but elevator input activates the servos as ailerons and the aileron input activates them as elevator...like the channels are reversed. Any ideas friend? Sorry to go off topic.

Mike
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Old 07-05-2008, 09:04 PM
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Originally Posted by totalsnafu View Post
Tom, I'll give that a try, however, wouldn't the trim be off to the left below 50%? I've looked at the wing and she appears straight. This is driving me nuts. There looks like there is a slight undercamber to the tip of the left wing. About 4" in from tip. Do you think that maybe this is pushing the left wing up? If so, how in the heck do I correct that?
try mixing a little epoxy and lite weight spackle together, and fill the undercamber, use a flexable straight edge to get the spackle and epoxy/filler smooth with, Like doing body work , with bondo Hope that helps, Chellie
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Old 07-05-2008, 10:31 PM
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Originally Posted by Angler-Hi View Post
Hey TS, not to hijack your thread, but how do you hook up the servos to the Rx and get them to activate elevator and ailerons in the Delta Wing mode? I did what the manual says, but elevator input activates the servos as ailerons and the aileron input activates them as elevator...like the channels are reversed. Any ideas friend? Sorry to go off topic.

Mike
That's really is unusual. IF you switch left for right channels on the RX you only reverse the ailerons. Elevator stays the same. If while you have the the channels plugged in wrong and you reverse them on the radio, elevator will reverse and your ailerons will be corrected. Once you correct your RX input you can correct your ailerons/elev. settings.

What you describe sounds like a radio issue. Some radios allow you to switch stick assignment. What radio do you have?
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Old 07-05-2008, 10:43 PM
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Originally Posted by totalsnafu View Post

IDEAS? I'm at a loss.
Maybe is force related. More speed you have more something misshapes. Maybe one of your reinforcements isn't as solid as you think. Instead of holding it still it allows one wing to twist at speed?

Vertical not straight? Causing a pronounced turn at speed?

Just throwing ideas at you. I have no real clue.
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Old 07-06-2008, 01:27 AM
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I would have to believe you need to adjust one of the elevons, if the problem is more pronounced at speed all that means is the little bit of pull is amplified the faster you travel. This should be something easy to fix and the problem is probally something simpler then you think.

I have seen strykers bent from smashing the earth at WOT that still could track correctly. IMO i would start be centering the trim and then adjusting the control arms to center; start there.
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Old 07-06-2008, 02:05 AM
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Thanks PK. I'm just a moron...everything was working like it was supposed to. I just forgot that when looking at the servos side by side, that they were supposed to move the same way. I'm a dork! BTW, I'm using my DX7.
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Old 07-06-2008, 03:27 AM
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Originally Posted by Angler-Hi View Post
Thanks PK. I'm just a moron...everything was working like it was supposed to. I just forgot that when looking at the servos side by side, that they were supposed to move the same way. I'm a dork! BTW, I'm using my DX7.
Funny ... I was setting up my radio for my Stryker, switching servo slots on RX (couldn't remember which went where), reversing servos and thought I had it all figured out. Trimming everything out and I run out of trim. I couldn't level the flaps. What the ....? All of a sudden I'm looking at the flaps again and they are reversed? Damn ..I have to set it up all again ...this time correctly. Trim problem solved too.
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Old 07-06-2008, 06:25 AM
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Sounds like me PK.
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Old 07-06-2008, 04:06 PM
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Thanks for the responses. I've looked at everything. I will adjust the elevon again to see what I come up with. It's annoying the heck out of me. I think that Tom may be correct and that I have a fuse with a slight twist in it. The tails are perfectly square, so that's been eliminated. Elevons are dead even (as measured with a ruler), and thrust has been ruled out since I have adjusted the motor (shimmed) in both directions and still have a problem. There is extremely little flex in the wing. I can hold it by one edge and it moves very little.

I'm going to adjust the left elevon up a few turns to see if I can counter the right roll. I'm just worried about the thing wanting to turn left at slow speed. I'm also creating more drag, which is a bummer on a Stryker.

I appreciate the assistance. "Thanks Button" is a good thing.
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Old 07-06-2008, 04:36 PM
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TS...post some photos up. Top, bottom, left and right sides, front and back. Just curious.
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Old 07-06-2008, 06:15 PM
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I'll get pics tonight and post them in the morning when at work (very high speed internet at work).
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Old 07-07-2008, 01:08 PM
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You'll be surprised at how little you have to move the elevon to trim it out for high speed. You probably won't notice any change at the slower speeds. Good luck
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Old 07-07-2008, 03:13 PM
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Adjusted the Elevon last night. She stays fairly level at high speed (a little drift but trimable) but now she turns left a slow speeds. I think that I'm screwed either way.
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Old 07-07-2008, 03:48 PM
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Couple of things that may help. Very hot water, will allow you to straighten out the one wing that's off. Run the wing under hot water while twisting out the bad section, go a little past where it should be. Hold the wing until it cools, or switch to cold water to speed it up. Repeat as needed.


Other and I would only do this as a last resort. If your tx has the capabilities, you can mix the elevons to throttle position. I used to do this to combat the climb the Stryker want's to make as you accelerate. On mine I mixed the elevons to throttle to drop the elevons in relation to throttle position.

You could do the same, making a left up right down elevon mix to the throttle to combat the roll condition.
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Old 07-07-2008, 03:48 PM
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Originally Posted by totalsnafu View Post
Adjusted the Elevon last night. She stays fairly level at high speed (a little drift but trimable) but now she turns left a slow speeds. I think that I'm screwed either way.
Don't give up the ship just yet. How about trying a programmable mix on your DX6? I've never done it, but it might be worth trying.
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Old 07-07-2008, 05:45 PM
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I'm going to try the mixing solution... just no clue how to do it on the DX6.
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Old 07-13-2008, 05:57 AM
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DetroitHawk
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i was thinking about this problem today, have you checked the vert fins?
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Old 07-13-2008, 02:16 PM
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Geez all this trouble for a $20 fuse......buy another and rip your stuff out. Even with all the radio "repairs" it's just not going to fly right. If you can't fix the fuse then you'll never be really happy with it.

Anyway thats how my frustration would deal with it.

Really sucks you got a bad fuse.
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Old 07-13-2008, 02:53 PM
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Originally Posted by DetroitHawk View Post
i was thinking about this problem today, have you checked the vert fins?
The vert fins are perfectly squared. I checked them. I have honestly left it be for the last week before I get mad and trash it. A wise flyer told me to walk away, regroup, reassess, and retry. So, I've been working on another project.
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Old 07-14-2008, 11:46 PM
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What paint did you use? or covering?
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