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How to secure the wing spar?

Old 10-12-2008, 04:27 PM
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Lieutenant Loughead
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Default How to secure the wing spar?

Will "Foam Safe CA" be rigid enough to secure the wing spar to a flat foamie?

In the past, I've always used Epoxy, Gorilla Glue, or Cold Temp Hot Glue... :o
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Old 10-12-2008, 04:41 PM
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Hey Guy, I always used foam safe CA if the wingspar isn't embedded that deep into the wing. I would use sand paper to get the surface a semi rough and run CA into the groove and then install the spar. CA holds pretty darn good for me.

How are you installing the spar and what is it...CF...skewer?
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Old 10-12-2008, 05:58 PM
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Lloyd
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Default CA on foamy wing spar

I am using it, but be careful with ZipKicker because it will melt some foams. Spray lightly and quickly wipe up any excess with a paper towel.
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Old 10-12-2008, 06:48 PM
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Sky Sharkster
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Default More Space?

Hi Lt.,
The CA will work, another trick I use is to cut up (with scissors) leftover fiberglass cloth and mix it with either Ca or epoxy and make a slurry or goop to fill in the space around the doubler. Microballons will work also, but they don't seem to add as much strength as the 'glass cloth fibers.
Ron
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Old 10-12-2008, 08:22 PM
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fr4nk1yn
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I hope CA will work 'cause I just built one, yet to maiden that's held in place with only CA. A 5/16" square spar in bluefoam.
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Old 10-12-2008, 09:01 PM
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I found a neat trick with spars in cut-out recesses like this - I almost completely coat the spar in gorilla glue, insert it into the recess, wipe off the excess with a spirits-soaked rag, and then cover the recess with 3M Transpore. The result after curing is that the excess GG foams through the pores in the tape and leaves almost a perfectly smooth surface - ie, the excess ends up on the outside of the tape and can be peeled off with ease. I realize that Transpore is not the cheapest stuff around, but I have a surplus of it from a motorcycle 'incident' a few years back lol.

I learned this completely by accident one day, and I think I have a few pictures of how it worked on my RCSuperPowers Extra 300.

cheers
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Old 10-13-2008, 01:26 AM
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Yeah, the wing spar is a Carbon Fiber tube, and it's recessed into the 6mm Depron wing.

Normally I would use Gorilla glue, but I want to try to make this one as light as possible.
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Old 10-13-2008, 03:54 AM
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Originally Posted by Lieutenant Loughead View Post
Yeah, the wing spar is a Carbon Fiber tube, and it's recessed into the 6mm Depron wing.

Normally I would use Gorilla glue, but I want to try to make this one as light as possible.
Yeah, I would use the foam safe CA. That's what I'm building my GWS ME-109 with and so far so good. I also used spars on my Cessna 206T and it worked great! Good luck Guy, let us know how it turns out.

Mike
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Old 10-13-2008, 03:57 AM
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gfdengine204
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Yanno, I have heard that carbon fiber arrow shafts from Walmart work just as well, and cost less. (I got mine for less than $5/shaft)
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Old 10-13-2008, 04:01 AM
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Gorilla Glue might not be as light as CA but if it could be used I would over CA is a "questionable" area.

It's still very light compared to say epoxy.

Posted via Mobile Device
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Old 10-13-2008, 06:16 AM
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Originally Posted by Lloyd View Post
I am using it, but be careful with ZipKicker because it will melt some foams. Spray lightly and quickly wipe up any excess with a paper towel.
Hi Lloyd try this Homemade Kicker, it works great and wont hurt the foam, mix 1 teaspoon of baking soda, to 1 oz of water, shake well, and use a spray bottle to apply, No Fumes from a Kicker and safe to use, just wipe off the excess after your done, or it will leave a baking soda power film, thats all that I use now days, and the guys in my club love it, and its Cheap, Like Me hope that helps, Chellie
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Old 10-13-2008, 02:49 PM
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Originally Posted by gfdengine204 View Post
Yanno, I have heard that carbon fiber arrow shafts from Walmart work just as well, and cost less. (I got mine for less than $5/shaft)
Kev -- you haven't been shopping at www.KarglUSA.com -- I can sell you a Carbon Fiber Tube (hollow) 4x3x750mm (Wing Spar) for $3.11.

Okay -- maybe I haven't posted that on my web site just yet... I have too many products, and too little time!

I gotta say, I'm really happy that my prices are lower than WalMart!
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Old 10-13-2008, 03:26 PM
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Originally Posted by Lieutenant Loughead View Post
Kev -- you haven't been shopping at www.KarglUSA.com -- I can sell you a Carbon Fiber Tube (hollow) 4x3x750mm (Wing Spar) for $3.11.

Okay -- maybe I haven't posted that on my web site just yet... I have too many products, and too little time!

I gotta say, I'm really happy that my prices are lower than WalMart!
Guy, I didn't know you had an online store!! That's awesome man. I just added it to my favorites folder! I remember you talking about it a while back, but didn't know it was up and running. That's sweet man! I know where I'll be buying my next warbird foamie!!

Mike
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Old 10-13-2008, 04:37 PM
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LOL -- thanks Mike. I know this is off topic, and I hope I don't get in trouble with the mods, but I'm opening an account with GWS. I hope to offer GWS airplanes and GWS props on my web site by the end of the month!
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Old 10-13-2008, 04:49 PM
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Originally Posted by Lieutenant Loughead View Post
Kev -- you haven't been shopping at www.KarglUSA.com -- I can sell you a Carbon Fiber Tube (hollow) 4x3x750mm (Wing Spar) for $3.11.

Okay -- maybe I haven't posted that on my web site just yet... I have too many products, and too little time!

I gotta say, I'm really happy that my prices are lower than WalMart!
What would shipping run me? And don't say a pizza, either!
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Old 10-13-2008, 10:24 PM
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Originally Posted by Lieutenant Loughead View Post
LOL -- thanks Mike. I know this is off topic, and I hope I don't get in trouble with the mods, but I'm opening an account with GWS. I hope to offer GWS airplanes and GWS props on my web site by the end of the month!
Sorry man, didn't mean to get off-topic there. Looks like I have a list of GWS birds to make...good luck with your CF spar and CA
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Old 10-16-2008, 12:54 AM
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Default Deep enough?

I use a scrap piece of hand made plywood. Made from 2 precut pieces of wood veneer scraps glued together & lightened with some holes.

I then LIGHTLY coat the spar with Tightbond II & insert it in & out a couple of times. These are snug fits. 2 weeks later it has set up for any flights.
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Old 10-16-2008, 02:54 AM
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Originally Posted by Cyclops View Post
I then LIGHTLY coat the spar with Tightbond II & insert it in & out a couple of times. These are snug fits. 2 weeks later it has set up for any flights.
Two weeks?! O:
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Old 10-16-2008, 04:21 AM
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Default At my age ?

No rush with 6 planes & 6 hydros to build & play with.
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