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Home🌌Off Topics🌌Off Topics Main Discussion › Need help about airplane rudder.
03-30-2010 04:53 AM  10 years ago
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Spitfire1

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Perth Australia

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Need help about airplane rudder.
I just got my new mx2 out of the box and noticed that the tip of the rudder is slightly curved at the leading edge about 1 - 2 degrees.

Is this normal or a defect the reason I ask is I also fixed the motor ofset on my other plane because I thought it was a defect, I will look silly takeing it back to the shop if its normal.

If it is a defect will it be OK? it is a 50 size aerobatic 3d plane with a big rudder and it is only slightly curved about 1/2 an inch or so from the leading edge.

This is the plane.

Thankyou.
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03-30-2010 04:55 AM  10 years ago
fla heli boy

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cape coral, florida

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not normal.
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03-30-2010 04:57 AM  10 years ago
Spitfire1

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Perth Australia

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****

With such a big rudder do you think it will cause much problems?
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03-30-2010 05:36 AM  10 years ago
SuperSixTwo

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Virginia City, NV ---USA

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I say, fly it. Worse case is you will have to trim it.
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03-30-2010 06:07 AM  10 years ago
Spitfire1

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Perth Australia

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Thanks, Il try and straighten it somehow, maybe with an iron on a workbench.

This kit is daunting, I dont even know how to put the hinges in the wings or anything, its going to be alot of work to get it done.
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03-30-2010 06:51 AM  10 years ago
twistedrcpilot

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Houston, Tx - USA

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I say as long as its not loose fly it. If it's on the top, it could be to off set the torque of the engine. Depending on the configuration, and the shape, just rudder will cause the plane to roll a bit. Just an idea. I'll probably have people argue with me about this, but I've seen it first hand.

trim it, then fly it like you stole it. thats a good lookin plane.
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03-30-2010 07:01 AM  10 years ago
Spitfire1

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Perth Australia

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^ I wondered if it was to ofset the torque, but apparently its a defect.

This is my first real wood plane, Ive only had foamies so far an f35 3s ducted fan was my first, now a 1.4 mtr foam cessna and I also have a 70 mm ducted fan f16 but have not managed to fly it yet without crashing into the ground yet.
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03-30-2010 07:42 AM  10 years ago
Spitfire1

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Perth Australia

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Times like this I wish my old man was still around to help me build this thing, I dont have a clue how to build a plane and the instructions are all written in Chinglish .
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03-30-2010 11:46 AM  10 years ago
Mojoe

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Brisbane, Australia

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Most times I have been able to straighten control surfaces using a hot air gun. Twist the rudder straight, you will notice the covering goes loose and wrinkles on one side. Heat the wrinkles with the hot air gun until the covering goes tight again.

Apply the heat gradually and stop as soon as the covering goes tight, it doesn't take long to burn a hole in the film.
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03-30-2010 01:02 PM  10 years ago
SSN Pru

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Taxachusetts

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what kind of "motor offset" did you fix?

built in right thrust is normal to counter torque and prop wash effects at low airspeeds.

you don't want to have to trim your plane out with the control surfaces to fly straight if you can help it. you'll only cause problems in flight regimes outside of the cruise speed. A straight plane will fly the best! that's not to say that you won't be happy with just trimming one out though.
Stupidity can be cured. Ignorance is for life!
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03-30-2010 01:32 PM  10 years ago
GREYEAGLE

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Flat Land's

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Most Likley
It's a touch warped from shipping and / or change in humidity.

Best remedy it to gently clamp the edge between two ridged rulers or straight edges. Some times large note book paper clamp's will work.

Let it sit like this this for a few day's till the wood normalizes back to it's original posistion.

After a bit, you can then shim under each of the rules to push the bend just a touch past center so that when you remove the rules it fall's back on the line of the leading edge.
greyeagle
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03-30-2010 01:41 PM  10 years ago
rcmiket

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El Paso,Texas

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If it's build up. Twist it straight while heating the covering with a heat gun. Two people is nice here. Don't over do the gun and melt the covering. Hold till cool might take a time or two but its the best method I've used to remove twists in Arf's. This type of thing is very common now days.
Mike
"When Inverted down is up and up is expensive"
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03-30-2010 02:12 PM  10 years ago
SSN Pru

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Taxachusetts

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is the rudder solid or built up?Stupidity can be cured. Ignorance is for life!
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03-30-2010 06:44 PM  10 years ago
Themsah

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miami

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Try taking a close up pic of the rudder. We should be able to let you know whether its ok to fly.

Its probably not a bigdeal, but could cuase some issues in very precise maneuvers
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03-30-2010 07:37 PM  10 years ago
fla heli boy

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cape coral, florida

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that's a big enough plank, that I wouldn't cure the twist via the covering. I'm sure the structure of the rudder is compromised and I'd hate to see it fail in flight and take down the whole plane. Cut back the covering in that area, repair/strengthen the area, then re-cover.
BTW, where did you get that plank from??? That is one helluva good looking pre-built. I'd like to get back into a plank and that's the size I'm looking for. No way to carry the 35%'ers I was getting into years ago.
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03-30-2010 11:19 PM  10 years ago
flyride

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Salt Lake City UT

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1+ on the heat gun. Just straighten it out and apply heat to remove wrinkles. Just don't over do it, I have had to do it a time or two on My planes.and the blonde said "RECTUM, Hell damn near killed em!!"
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03-30-2010 11:40 PM  10 years ago
fla heli boy

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cape coral, florida

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BUT.....as I said above. With a plane that large, I'd be sure that the structure is sound. Snapping off the top half of the rudder in flight is not the end of the world if you're a decent pilot, but it will just make it that much more work to repair. I am thinking the structure itself has been weakened. Hard to say without laying our hands on it I guess.
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03-31-2010 01:06 AM  10 years ago
SSN Pru

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Taxachusetts

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let's give spitfire a chance to tell us if it's a solid rudder, AKA foam core with balsa sheeting, or if it's a built up and covered rudder.Stupidity can be cured. Ignorance is for life!
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03-31-2010 01:51 AM  10 years ago
Spitfire1

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Perth Australia

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Wow, lots of great info since I was away.
let's give spitfire a chance to tell us if it's a solid rudder, AKA foam core with balsa sheeting, or if it's a built up and covered rudder.
Its a built up rudder with ribs and covering, not solid with foam, I will try all the heat methods first and then maybe cut away the film and fix it.
what kind of "motor offset" did you fix?
On my Foam cessna I thought the motor offset was a defect and filed down the motor mounts to make the motor level, have fixed it now and it flies and taxis much better.
where did you get that plank from???
Dont know who distributes them in US the companies called Goldwing
http://www.goldwingrc.com/en/
The kit was just over $200, the motor cost me $50 from HK 50 size electric, 4 - 6s lipos and a 75 esc.
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03-31-2010 05:06 AM  10 years ago
fla heli boy

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cape coral, florida

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you can ignore my PM spit. I was hoping you had a name for a US supplier. I would rather build, but I'm space limited right now and that thing sure looks great. I waddled thru their web site for a bit.
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