RE: Extra 2X2

RE: Extra 2X2
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RE: Extra 2X2 - 2/25/2007 1:15:04 PM

devcon9

Posts: 74
Joined: 8/30/2004
From: Hanworth, CA, UNITED KINGDOM
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quote:

ORIGINAL: tIANci

Ijust picked up the 2x2 Extra and the workmanship is really nice. I am new to composite planes, I tried to dry fit this plane and noticed that my HORIZONTAL stabs are not flush, especially the port side one. There is a gap of about 1/16" (the leading and trailing edge) and I would like to know if its because of a mere dry fitting or there is something I need to do to make it flush. Any input would be great.

I think my plane will be coverted for EP. At about 13 lbs she is perfect for EP. Thanks guys!!!

I had the same sort of problem with the starboard side,a gap from the LE back, too arkward to sand, I applied release agent to the fuse, and applied a epoxy/micro balloons mix to the edge of the stab, fitted the stab on, wait for cure, remove and trim excess.

Tony

(in reply to tIANci)

Post #: 201

RE: Extra 2X2 - 2/25/2007 4:51:40 PM

tIANci

Posts: 8317
Joined: 1/15/2004
From: Kuala Lumpur, MALAYSIA
Status: offline

Tony ... thanks for the reply ... what is a release agent?

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(in reply to devcon9)

Post #: 202

RE: Extra 2X2 - 2/25/2007 6:08:37 PM

devcon9

Posts: 74
Joined: 8/30/2004
From: Hanworth, CA, UNITED KINGDOM
Status: offline

quote:

ORIGINAL: tIANci

Tony ... thanks for the reply ... what is a release agent?

Release agent is really anything that will not adhere, or stop anything adhering to it, there are propriety ' release agents' used in moulding processes, for minor jobs you can use, wax polish / candle / vaseline
any of these would do for this job on the stabs.
Walk thru -
Very lightly sand the mating edge of the stab ( just to key it slightly )
Apply sellotape all around right to the edge of the stab
Apply some 'release agent' to the fuse slightly larger in area where the stab meets the fuse
Apply a little 'release agent' to the CF rod around the area where in protrudes from the fuse, and the front locating GF pin ( just to ensure that if the mix drips onto the rods it will come apart)
Mix up some 1hr/30min epoxy with some micro-balloons, mix till you get a very stiff mix ( will not fall off the mixing stick)
Apply a bead of the mix all around the edge of the stab
Slide the stab on and position
Let cure till it goes like ' very hard rubber '
Slide stab off, using a new model blade carefully cut excess off till flush with the tape, remove tape, if you want to be really fussy you can finish off flush, but really you only have the thickness of the tape and it hardly shows.

Tony

(in reply to tIANci)

Post #: 203

RE: Extra 2X2 - 2/26/2007 5:06:36 AM

tIANci

Posts: 8317
Joined: 1/15/2004
From: Kuala Lumpur, MALAYSIA
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I know what you mean now! Appreciate it a lot ... thanks!!! How does your plane fly Tony? Really good? Did you remove the overhanging bit on the aileron? At the bottom that is ... the ailerons seem spongy when you deflect it down compared to up. I think I am not going to do anything as I will not be using her for 3D. She is so beautiful that I want to fly her for IMAC only.

< Message edited by tIANci -- 2/26/2007 5:07:07 AM >

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(in reply to devcon9)

Post #: 204

RE: Extra 2X2 - 2/26/2007 12:03:51 PM

devcon9

Posts: 74
Joined: 8/30/2004
From: Hanworth, CA, UNITED KINGDOM
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quote:

ORIGINAL: tIANci

I know what you mean now! Appreciate it a lot ... thanks!!! How does your plane fly Tony? Really good? Did you remove the overhanging bit on the aileron? At the bottom that is ... the ailerons seem spongy when you deflect it down compared to up. I think I am not going to do anything as I will not be using her for 3D. She is so beautiful that I want to fly her for IMAC only.

I am very pleased with the performance of my 2x2, despite it being a heavier example, mine came out at 7kg, I am using a ZDZ50NG and have a smoke system, I would like it to be a lot lighter, but it does not fly ‘heavy’, it is very overpowered with the ZDZ50.
The best setups I have seen are the electric conversions..!!

The ailerons do get tight downward, I did not remove the overhang, but I have made a small slot to clear the aileron horn when going to full deflection.
Attach some pics.

There are some posts on here by Buzz Lightyear who used a OS140RX and is flying IMAC, he setup is really good.

Tony

Attachments

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(in reply to tIANci)

Post #: 205

RE: Extra 2X2 - 2/26/2007 3:43:32 PM

dwextra

Posts: 4
Joined: 12/12/2006
From: ingleside, IL, USA
Status: offline

I have a 2x2 that I put together this summer. It's a nice flying airplane however I am having some tracking issues in knife flight, it pulls to the belly. Invert flight is nice, all most hands off. I set it up with 3 degrees right and 1 degree up thrust. running a DA50 22X10.
wing and stab are at zero incidence. I added a rudder elevator mix to help correct the tracking in knife edge but I would really like to know how to adjust the plane so it will track straight with out any mixes. I'm looking for help or suggestions.
Dave

(in reply to devcon9)

Post #: 206

RE: Extra 2X2 - 2/26/2007 5:30:22 PM

devcon9

Posts: 74
Joined: 8/30/2004
From: Hanworth, CA, UNITED KINGDOM
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quote:

ORIGINAL: dwextra

I have a 2x2 that I put together this summer. It's a nice flying airplane however I am having some tracking issues in knife flight, it pulls to the belly. Invert flight is nice, all most hands off. I set it up with 3 degrees right and 1 degree up thrust. running a DA50 22X10.
wing and stab are at zero incidence. I added a rudder elevator mix to help correct the tracking in knife edge but I would really like to know how to adjust the plane so it will track straight with out any mixes. I'm looking for help or suggestions.
Dave

Dave
Mine is exactly the same, the basic F3A ' trim charts' states -

Fly model on normal pass, roll to knife edge, left and right, use rudder to hold model level
A. Model does not change pitch
B. Model pitches to canopy
C. Model pitches to belly

A. No adjustment needed
B. Either move CG aft; or increase wing incidence; or mix down elevator with rudder
C. Reverse of B

So, you adjust one thing, and it will affect something else..!!! bit of a 'two edge' situation.

The only model I have flown that did not have any coupling issue's was a Yak, absolutey no elev inputs required in KE, except for steering it and cross wind..! The Yak setup was very close to a zero/zero/zero ( everything virtually on the thrust line..)

Tony

(in reply to dwextra)

Post #: 207

RE: Extra 2X2 - 2/27/2007 4:43:38 AM

tIANci

Posts: 8317
Joined: 1/15/2004
From: Kuala Lumpur, MALAYSIA
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Tony ... thanks for the tip on the little cut out ... I hope to keep her light with EP. Just realised that you only need to bite the bullet for batteries and you can have as many big EP planes as you want because the motor and ESC is really cheap nowadays. I got a Mid West CAP 232 80" too ... that was built pretty light for me but the Comp ARF is so much lighter!

Yeah ... Buzz's set up is really light and he must be having a ball ... I have the YS160 but I doubt I want to go with an engine for my plane, will be more fun with EP. I guess I am getting tired of the mess from nitro engines etc. I just want to plug N play ... appreciate your assistance! Thanks.

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Its nice to be important, but its more important to be nice ...
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(in reply to devcon9)

Post #: 208

RE: Extra 2X2 - 2/27/2007 3:21:44 PM

dwextra

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Joined: 12/12/2006
From: ingleside, IL, USA
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Tony, thanks for the info on knife edge tracking.

Dave

(in reply to tIANci)

Post #: 209

RE: Extra 2X2 - 4/5/2007 12:54:25 AM

red_noir

Posts: 49
Joined: 3/8/2006
From: Toronto, ON, CANADA
Status: offline

I placed an order for my prototype scheme 2x2 today !!

(in reply to dwextra)

Post #: 210

RE: Extra 2X2 - 6/13/2007 12:00:25 PM

CHV69

Posts: 74
Joined: 1/5/2005
From: Ocean View, NJ, USA
Status: offline

Can this plane be built to weigh less then 11 lb ready to fly?

Thanks
Carl

(in reply to red_noir)

Post #: 211

RE: Extra 2X2 - 6/13/2007 12:42:27 PM

devcon9

Posts: 74
Joined: 8/30/2004
From: Hanworth, CA, UNITED KINGDOM
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quote:

ORIGINAL: CHV69

Can this plane be built to weigh less then 11 lb ready to fly?

Thanks
Carl

Hi Carl

JMHO..I think you would be really pushed to get the 2x2 less than 11lbs RTF, the airframe weighs in at around 7lb 2oz, you could lose a few oz with a CF wing tube. Lightest I.C I know about is Buzz lightyears OS 140 2x2, just shy of 12lb I think..Electric versions come in around 12-13lb, depending on motor/cells

Good flying
Tony

(in reply to CHV69)

Post #: 212

RE: Extra 2X2 - 6/13/2007 2:15:21 PM

marclaukien

Posts: 2
Joined: 6/11/2007
From: , FL, USA
Status: offline

Hello everyone,

I'm building an Extra 2x2, and on the left wing I can get a maximum aileron down throw of less than 45mm instead of the recommended high rates of 50mm. (I can get up to 65mm on the right wing.) I spoke with a Comp-ARF rep, and they told me that this would be more than enough throw.

What is your experience? How much aileron down-throw do you use for 3D rates?

Thanks,
Marc

(in reply to Paul Eagon)

Post #: 213

RE: Extra 2X2 - 6/13/2007 3:27:03 PM

CHV69

Posts: 74
Joined: 1/5/2005
From: Ocean View, NJ, USA
Status: offline

I was hoping to use this plane as a practice and back up Pattern plane. But if it can't be RTF under 11 lb then I guess it is no good for my purposes.

Carl

(in reply to marclaukien)

Post #: 214

RE: Extra 2X2 - 6/13/2007 4:37:54 PM

devcon9

Posts: 74
Joined: 8/30/2004
From: Hanworth, CA, UNITED KINGDOM
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