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« on: August 28, 2018, 01:40:41 PM »
Prakhar Verma
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Have anyone ever vacuume bagged a glider wing? I am thinking of doing it but i don't have the required materials.can i find it in a hardware store(i am reluctant to buy it online)?if i can find it in a hardware store how much will it cost me?
Any help would be appreciated.
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« Reply #1 on: August 28, 2018, 10:05:48 PM »
K K Iyer
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@prakhar verma,

Havenít seen anyone doing that in India yet.
Hereís a balsa wing I glassed.
48Ē span, 4Ē avg chord, 192 sqin.
(18gm/sqm glass cloth, 20 min finish cure epoxy, from Bob Smith Ind, via HobbyKing)
72gms raw plus 28 gms glass+epoxy. Extremely strong even with no dihedral braces.

If you donít mind, Iím curious about why you are enquiring about vacuum bagged glass wings?
Whatís the purpose?
Just experimenting?
Or are you already flying 2m gliders, and want larger ones...
Regards

191FBC1E-85AB-4CE6-852E-04BA22B1E6A1.jpg
Re: Vacuum bag rc glider wings in India
* 191FBC1E-85AB-4CE6-852E-04BA22B1E6A1.jpg (79.41 KB, 800x600 - viewed 201 times.)
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« Reply #2 on: August 29, 2018, 10:29:02 PM »
pnkyjs
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Very nice information ! Its New technology for me .
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« Reply #3 on: August 31, 2018, 10:55:04 AM »
Prakhar Verma
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Hello friend🙄,
 i was actually planning to make a 1.5m dlg but realised that it is better to just cover it with carbon fiber and fiber glass without vacuume  bagging.
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« Reply #4 on: August 31, 2018, 06:21:16 PM »
saikat
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if you have never done this sort of thing before - you will find it is much harder
than it seems on the internet.

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« Reply #5 on: August 31, 2018, 07:28:55 PM »
K K Iyer
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@prakhar verma,
You said youíre 9 years old. Iím 65.

Before you tackle a 1.5m DLG with carbon fibre and fibreglass, may I ask if youíve built a chuck glider before?

Did you see this thread?
http://www.rcindia.org/kites-trains-free-flight-and-all-others/one-minute-flight/msg288481/#msg288481

If youíre really keen, send me a PM. Iíll give whatever help I can.
Regards
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« Reply #6 on: August 31, 2018, 09:01:01 PM »
pnkyjs
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Iyer sir, I wish I were there in your workshop !
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« Reply #7 on: August 31, 2018, 09:11:42 PM »
K K Iyer
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@pnkyjs,
Welcome. Provided I know more about you than just your handle Ďpnkyjsí.
My workshop is my drawing room!
Several young aeromodellers have actually come and stayed with me!
Regards
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« Reply #8 on: September 21, 2018, 03:48:09 PM »
slaerom
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That's a great build Sir.
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« Reply #9 on: September 30, 2018, 10:08:11 AM »
IntheSky
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Vacuum bagging depends on your construction method. If you're doing a traditional wood build (spars + ribs + sheet skinning) then you dont need vacuum bagging.
However, if you're going in for foam core wings then a CF/glass skinning would require vacuum bagging. The simplest is to look at vacuum bags for luggage (wherein you put your clothes, vacuum the air out to make it a smaller/lighter package). Or you could make it yourself from sheets cut to size, with double-sided adhesive at the edges along with a gel coat for air-proofing. Once done, you can select a convenient spot for the valve, mount it and then proceed with the airbagging.
Of course you need to spray the insides of the bag with mould release before bagging. This is not a trivial process and does involve a fair bit of involvement.

The easier way would be to have the foam core wings with adequate CF reinforcements covered with a thin balsa skin and then glass it in.
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« Reply #10 on: October 01, 2018, 11:15:19 PM »
samayaraj
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Im doing composite DLG. Im new to this and Im nearing the fabrication techniques.

Im using Owens Corning XPS foam as core material reinforced with 220gsm Carbon fiber cloth in the leading edge and covered with 50gsm glass fiber cloth with Araldite LY556IN epoxy.

I used AG45Ct profile and weight of wing is 100g. See the attachment for reference.

I just followed this video


IMG_20180709_202717.jpg
Re: Vacuum bag rc glider wings in India
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« Reply #11 on: October 02, 2018, 12:40:09 AM »
K K Iyer
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@samayaraj,

Sir,
Please tell us more!
Do start a new thread of your own.

100gms? Span/area?
AUW of the DLG?
Many more queries...

My 48Ē balsa wing, root 4.5Ē AG03, tip 3.5Ē AG11, area 192 sqin, 18gsm glass was ~100gms.
But 12 Aspect Ratio too much for DLG (You may have seen the video of the discus launch. Disastrous!)
So shifted to histart, but thatís another story.

Regards
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« Reply #12 on: October 02, 2018, 07:07:26 AM »
IntheSky
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Looks great !! Hope you can post a video of its maiden when its complete !
All the best ! Smiley
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« Reply #13 on: October 02, 2018, 09:12:29 AM »
samayaraj
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@samayaraj,

Sir,
Please tell us more!
Do start a new thread of your own.

100gms? Span/area?
AUW of the DLG?
Many more queries...

My 48Ē balsa wing, root 4.5Ē AG03, tip 3.5Ē AG11, area 192 sqin, 18gsm glass was ~100gms.
But 12 Aspect Ratio too much for DLG (You may have seen the video of the discus launch. Disastrous!)
So shifted to histart, but thatís another story.

Regards


Dear KK Iyer ji,

This is my first attempt. So Im testing whether my fabrication techniques wokring good or not. After sucessfull completion, I will start posting videos of composite aircraft making.

Im making DLG with wing span of 1.1m, Aspect ratio is 10 approx., wing area is 0.11 m2 approx. Wing weight is 100 gms and total weight including all components 220 to 250 gms.

I will post many videos related to basics of carbon fiber fabric cutting, preparing prepeg by own, glass fiber laying, hot wire foam cutting, vacuum bagging etc which I exprienced so far.

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« Reply #14 on: October 02, 2018, 09:50:07 AM »
Mehul Anand
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This stuff feels interesting!!
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« Reply #15 on: October 02, 2018, 01:19:23 PM »
saikat
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Great stuff Man !

Where did you get the foam ?
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« Reply #16 on: October 02, 2018, 01:19:45 PM »
samayaraj
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Hello friend🙄,
 i was actually planning to make a 1.5m dlg but realised that it is better to just cover it with carbon fiber and fiber glass without vacuume  bagging.

Tell me about the materials you have decided to make. I think you may go for foam core. If so, you have to reinforce the wing with CF in both spar as well as in leading edge.
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« Reply #17 on: October 02, 2018, 01:20:52 PM »
samayaraj
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Great stuff Man !

Where did you get the foam ?

I got foam material from local insulation dealer. Its owens corning Fomular XPS foam.
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« Reply #18 on: October 07, 2018, 05:35:23 PM »
Prakhar Verma
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What is a local insulation dealer and Which shop are you talking about?
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