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Old Jan 10, 2013, 11:18 AM
Silent Flight
Twyl's Avatar
United States, CA, Cypress
Joined Jul 2005
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Thanks for the responses guys. I am aware that the long(?) direction of a ribbon spar is where the strength is, however please recall that we are talking about the Fox wings here which are reeeaaaaly thin out near the tips and not a fat combat wing which can easy handle a nice wide ribbon or two. I assumed it was this conundrum that Ian was trying to work around and thus proposed (and implemented) the two angled but parallel spars. While I think the approach is novel I do think it is missing the integrity of an I-beam like structure which my proposal with ribbon spars at perpendicular angles would more closely resemble.

Anyways, regardless of my proposal, if you can think of a good way to get a ribbon spar angled vertical out to the wing tip then I am all ears. Since I am already planing a narrow CF ribbon drag spar pretty much out to the tip maybe the center ribbon doesn't really need to go out that far?

Oh... and regarding my original question about what glue to use for the drag spar since the majority of it is not embedded in EPP, what would be recommended?

-Jonathan
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Old Jan 10, 2013, 11:36 AM
Livin ...The Endless Summer
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Joined May 2011
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Jonathon
I admire the way you think. I tend to do the same thing (but not as much). I tend to use available info then move on. But I'm always building lots of stuff.

I am with Chris here. Adding too much weight is also a factor to consider.
If the weight doesn't yeild the required result then why add it.
If you are dead set on it there are a couple of ways to go.
You could sand down the spar at the tip.
Make a spar sandwhich that gets smaller toward the tip. Over lapping the smaller one to the larger.
I added a small spar to my flow. I don't think it helped much.

Personally I like this plane but I like mine the way it is.
It's durable and a good flier. But I think the design just comes with a few flaws / things you have to live with. If I was going to build another I would just D box the leading edge of the wing and build it the same.


Rubio
Who likes gorilla glue
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Old Jan 10, 2013, 11:47 AM
Silent Flight
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United States, CA, Cypress
Joined Jul 2005
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Thanks Rubio, and by d-box you mean?

FYI, the drag spar I am interested in doing is shown pretty well HERE. OP notes he attached with goop, but I'm good with PU glue as well.



-Jonathan
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Old Jan 10, 2013, 12:06 PM
Livin ...The Endless Summer
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For that I would use GOOP.
No question.

Rubio

And by D box I mean add a layer of 5mil over the top and bottom over the wing to the center spar.
Forming a D.
One piece top ,one bottom overlap at leading as usual.
That means 10mil at the leading edge.

That would stiffen her up a bit.
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Old Jan 10, 2013, 12:12 PM
Silent Flight
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United States, CA, Cypress
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Quote:
Originally Posted by 67econoline View Post
For that I would use GOOP.
No question.

Rubio
Ok, was leaning that way after reading the post by the guy who did that mod.

Quote:
Originally Posted by Twyl View Post
Thanks Rubio, and by d-box you mean?
???

-Jonathan
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Old Jan 10, 2013, 12:24 PM
Livin ...The Endless Summer
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Quote:
Originally Posted by Twyl View Post
???
-Jonathan
Look up

Rubio
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Old Jan 10, 2013, 12:51 PM
Silent Flight
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United States, CA, Cypress
Joined Jul 2005
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Quote:
Originally Posted by 67econoline View Post
Look up

Rubio
Giving it some more thought, I think it is safe to stiffen the wing in stages. I will include the drag spar and then just do the LF like you said. If the stiffness does not seem to be enough I can still cut a slit into the wing through the LF, insert ribbon, then band-aid over with a thin strip of LF.

I noted the joiner spar is hollow and pretty thin walled as well so I will see about picking up a thicker walled CF joiner if not a solid one to replace it.

Rubio, did you find a good local source for aileron stock?

-Jonathan
who's not too concerned about weight especially near the CG point
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Old Jan 10, 2013, 12:53 PM
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Yeah, gluing into a flexy material like EPP?: you need a flexy glue! GOOOPPP!
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Old Jan 10, 2013, 12:58 PM
Silent Flight
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United States, CA, Cypress
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Quote:
Originally Posted by Woodstock 1 View Post
Yeah, gluing into a flexy material like EPP?: you need a flexy glue! GOOOPPP!
Thanks for chiming in Chris. Does your Windrider Fox still get air time?

-Jonathan
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Old Jan 10, 2013, 01:07 PM
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Hi Johnathan, my first Fox has gone to the big hangar in the sky: I drove over it ! It wasn't as bad as it sounds, it was on it's way out already..

No.2 is still in the rafters, I need to get it done by May (big glide-in here)!

Chris
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Old Jan 10, 2013, 01:18 PM
Silent Flight
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United States, CA, Cypress
Joined Jul 2005
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Quote:
Originally Posted by Woodstock 1 View Post
Hi Johnathan, my first Fox has gone to the big hangar in the sky: I drove over it ! It wasn't as bad as it sounds, it was on it's way out already..

No.2 is still in the rafters, I need to get it done by May (big glide-in here)!

Chris
Glad to hear you have a #2 in the rafters. Want to pull it down and have a go at it? Would be nice to have another active build to watch as I progress. Anyways, at the rate I build, or better put, with the amount of free time I get to build, I'll be lucky to get mine done by May as well. I just spent 3 months building a combat wing !

-Jonathan
who will try to complete this build in a more timely manor
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Old Jan 10, 2013, 01:27 PM
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Oi, I'm slow as well .

But I will modify this one very little, so shouldn't take long, eh?
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Old Jan 15, 2013, 08:24 PM
Silent Flight
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United States, CA, Cypress
Joined Jul 2005
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Quick response wanted but, can anyone give me the aileron width for the Fox? Looking to pick up some balsa stock in either 1 1/4", 1 1/2" or something else.

TIA

-Jonathan
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Old Jan 16, 2013, 12:59 AM
Silent Flight
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United States, CA, Cypress
Joined Jul 2005
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Thanks Rubio for the phone call. For anyone else curious the precut aileron is 1.25"x16". Informed with the info I needed I called up the hobby shop semi-near my work and not really on the way home to verify they had gotten in more aileron stock. In hindsight I think I got one of the RC car homeboys on the phone cause he happily confirmed they had two of the balsa sheet triangle things I was looking for. A bit skeptical as to why they would only get 2 in (last time they had only 1) I still decided to go check it out. Turns out they didn't have any new stock in and it was only the 1 as the second one turned out to be a misplaced piece of 1.5" stock. Oh well, I'll try again tomorrow.

Another question for anyone doing longer ailerons. How long? The balsa stock is 36" long so if I cut one in half that would give me two 18" ailerons (2" longer than the cut EPP ones). Is that more than plenty or should I go closer to 20 or larger?

-Jonathan
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Old Jan 16, 2013, 07:01 AM
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Joined Dec 2002
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Finished!

Just thought I'd show few pics;

A) install...... Note 2xA123 1100mAh stuffed in nose under magnet. Used loop of piano wire clamped in soldering iron to channel out . Small balsa keeper velcroed LHS

B) elevator snake

C) rudder servo buried under solartex

D) solartex.....really goes round compound curves with no pbm. Added white profilm to front underbelly to attempt to keep clean

AUW...... 24.5 oz, giving loading approx 11.4 oz/sq ft

Used 5 mil lam film wings, also used this on foam ailerons...stiffened them up fine.

Balanced 1 5/8 " from LE.

Rgds Steve
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