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Old Nov 22, 2011, 06:03 AM
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anthonyd's Avatar
Australia, VIC, Leongatha
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Vacuum infusion

Thought i would start a thread to find out if many are playing around with infusion, i have been playing with around for a few months and have had good results.
I have made a few videos and ill post up some pics of finished parts soon.
Would love to see other peoples ventures with infusion in our type of building.

Ant

This one is of infusing a wing panel using soric core materiel on Shanes (R/c junkie) scratch build 3.5m L-13 blanik.
lay up is
2oz glass, 4oz glass, SORIC, 2oz glass
7oz Kevlar hinge uni carbon spar caps

Vacuum Resin Infusion L-13 Blaník wing 3.5 meter (10 min 59 sec)
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Old Nov 22, 2011, 06:21 AM
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This the rudder for the same plane
layup is 2oz glass SORIC 2oz glass
This part is 95grams finshed.

Vacuum infusion 3.5 m L-13 Blanik rudder PT1 (9 min 32 sec)


Vacuum infusion 3.5 m L-13 Blanik rudder PT2 (10 min 8 sec)
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Old Nov 22, 2011, 07:54 AM
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Old Nov 22, 2011, 10:28 AM
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Does the plug ever NOT wet out completely especially in the corners and if so is there a way to prevent it?

It would seem to me that the epoxy would always take the path of least resistance and therefore may flow more freely where there are several layers of cloth or tow like around the middle of the chord or spar area. This in my mind would hamper the saturation in other thinner areas.

I am also wondering if you don't get a better bond of the epoxy to the cloth through conventional wetting out of the cloth and then vacuum bagging?

Regards,
Tom
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Old Nov 22, 2011, 10:52 AM
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That bugged me too while watching Ant's first video but I think I understand it now.
The reason to use the vacuum is to completely empty the job so there is no air to be displaced by the epoxy.
This means the epoxy is not getting drawn THROUGH the setup. It is getting drawn INTO the setup. Even if there is an isolated pocket that isn't wet before epoxy starts leaving the job the epoxy will still be drawn into that space by the vacuum even if it is more slowly.
You could turn off the connection to the vacuum pump and the epoxy would still flow into the unwet area - if there were no air leaks.
The difference is how much epoxy gets wasted by being drawn out of the job before everything is saturated.

As far as strength is concerned, if its done right, there is no chance of air pockets so it should be stronger.
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Old Nov 22, 2011, 01:55 PM
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Very interesting
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Old Nov 22, 2011, 02:11 PM
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Great work ant.
Set up is everything , proper gear and everything goes great.
The bonus is...you never touch resin , no gloves needed. And no mess.
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Old Nov 22, 2011, 04:14 PM
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Soric thickness?

What thickness is the Soric used in this layup Ant?
How does it compare with using balsa for the infusion method? I am guessing it would result in a slightly heavier part for a similar thickness due to more voids which fill with epoxy.
And with the balsa, a separate breather fabric would be required. (I am guessing?).

Jim.
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Old Nov 22, 2011, 05:28 PM
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Quote:
Originally Posted by Jimbello View Post
What thickness is the Soric used in this layup Ant?
How does it compare with using balsa for the infusion method? I am guessing it would result in a slightly heavier part for a similar thickness due to more voids which fill with epoxy.
And with the balsa, a separate breather fabric would be required. (I am guessing?).

Jim.
Jim the soric is 1.5mm think.We layyed up a rudder with balsa skin and one with soric the soric was lighter and stronger.Using balsa requirers the same beather as with using soric.

Shane
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Old Nov 22, 2011, 07:24 PM
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Quote:
Originally Posted by r/c junkie View Post
Jim the soric is 1.5mm think.We layyed up a rudder with balsa skin and one with soric the soric was lighter and stronger.Using balsa requirers the same beather as with using soric.

Shane
Wow, that is impressive. Where do you buy your Soric from?

Thanks.
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Last edited by Jim.Thompson; Nov 22, 2011 at 07:24 PM. Reason: source question.
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Old Nov 22, 2011, 08:21 PM
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Quote:
Originally Posted by Jimbello View Post
Wow, that is impressive. Where do you buy your Soric from?

Thanks.
http://ironbarkcomposites.com.au/

hope that helps Jim

Shane
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Old Nov 22, 2011, 08:23 PM
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Thanks Shane.
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Old Nov 22, 2011, 08:59 PM
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I plan to use vacuum infusion with some airex c70.75 in my F14 tomcat fuselage molds, as trying to get a conventional vacuum bagged layup with one person is near impossible, since the part is 8 feet x 3feet x2 feet.

What are you using for your flow medium? Ive been looking into using inkalink (sp?) To help speed the resin transfer down the center of my parts. Due to the size of the part, i will probably end up wasting allot of materials testing the layups.
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Old Nov 23, 2011, 01:45 AM
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Quote:
Originally Posted by Jimbello View Post
What thickness is the Soric used in this layup Ant?
How does it compare with using balsa for the infusion method? I am guessing it would result in a slightly heavier part for a similar thickness due to more voids which fill with epoxy.
And with the balsa, a separate breather fabric would be required. (I am guessing?).

Jim.
Jim, the balsa one was normal layup not infusion. The only difference in the matriels between the two rudder layups was the balsa one has a 4zo glass in it to help ding resistance, the soric has pritty good ding resistance with just 2oz and is way stronger, not that it matters for a rudder. With only 2oz glass and soric i dont think you will want to be sanding it to much or you will find the soric very quick, we normally prime or paint them in the molds witch helps but if you are trying to sand out lumps and bumps it could turn bad.

Ant
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Old Nov 23, 2011, 03:46 AM
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just loaded this one
We tried the spiral wrap over the mesh it went through super fast but as it shows in the video the resin dose not flow through the hinge material very well, lesson learned put mesh past the hinge!
The part came out fine and we are joining them all tonight.

Ant
Vacuum infusion 3.5m Blanik L-13 wing 2 (2 min 40 sec)
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