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Old Oct 27, 2012, 04:27 PM
Entropy Happens!
Jim.Thompson's Avatar
Bellingen NSW Australia
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Quote:
Originally Posted by Hamburglar View Post
Oh yeah another thing I want to try is laying dyed silk into the moulds for colour.
..........................:
Do you mean the part here or the mould??
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Old Oct 27, 2012, 05:16 PM
Alphabets make great soup
Hamburglar's Avatar
Australia, ACT, Canberra
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Quote:
Originally Posted by MATIN View Post
Not sure what the advantage is. But if the outside bag loses suction, you'll have a big mess on your hand courtesy of the inside bag!!!!
I'm hoping it's gonna be easier. No stuffing around with spinning a hundred nuts and bolts to get the moulds closed/open.

Quote:
Originally Posted by Jimbello View Post
Do you mean the part here or the mould??
The moulds are already finished (the black ones in the last pic I posted). I meant-
Quote:
Originally Posted by Hamburglar View Post
another thing I want to try is laying dyed silk into the moulds for coloured parts.
Something like this- Surfboards with coloured silk inlays.
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Old Oct 27, 2012, 05:32 PM
Entropy Happens!
Jim.Thompson's Avatar
Bellingen NSW Australia
Joined Aug 2008
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Bladder thread.

Jordan,

The option of using a vac bag to inflate the internal bladder has been discussed fairly extensively on the Inflation Bladder thread. Have you read it?
One thing that I don't think was discussed there (or elsewhere), is the matter of the excess resin that will come out of the mould join. That may or may not be a problem. Use of bleed cloth/paper towels??
The main constraint seemed to be the limited pressure available. One half a bar equates to only 7.5 psi.

Jim.

edit:
The most obvious advantage, to my mind at least, of using a vac bag to inflate the bladder is the ballanced forces inside and out that happen this way. In the long run, after lots of pulls, the mould will not suffer any undue distortion (around bolt holes) that it might using high pressure inside only. Adam (WWW) experienced this with earlier moulds and now uses purpose made clamps that can be positioned in different places for each layup etc. This was, of course, with fully backed moulds. I plan to do it with my steel RHS backed moulds. Adam has a short video demonstrating that somewhere.
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Last edited by Jim.Thompson; Oct 27, 2012 at 06:33 PM. Reason: see edit.
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Old Oct 27, 2012, 09:55 PM
Alphabets make great soup
Hamburglar's Avatar
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We'll see how it goes soon. Moulds are PVAd and primed. I made up a handful of bladders too. Everything's pretty much ready to go as soon as the glass shows up.
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Old Oct 27, 2012, 10:29 PM
Bunny Hill Flier
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United States, CA, San Juan Capistrano
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Sounds very interesting.
Love seeing your work.
The concept is new to me. But so is a lot of this.
I look forward to the result.

Rubio
Who loves cloth inlays on surfboards
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Last edited by 67econoline; Oct 28, 2012 at 10:56 AM.
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Old Oct 28, 2012, 05:37 AM
Alphabets make great soup
Hamburglar's Avatar
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I'm looking forward to it too!

I got to fondle a Wabbit today! What a cool little plane It made me decide to make a start on a Halfbad kit that I won at last year's PSS fest raffle (thanks Pismo).

Here's a pic of the bladder making from earlier.
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Old Oct 28, 2012, 11:10 AM
Jim in San Diego
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Ahhh, I get it now Jordan. I thought you were going to use that fabric in your next mold (mould ) That would be kinda cool in a part but it'd better be perfect or you're just adding weight to a painted plane
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Old Oct 28, 2012, 08:27 PM
Alphabets make great soup
Hamburglar's Avatar
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Quote:
Originally Posted by Pismo View Post
mold (mould )
My great-great-grandfather's name was Moulds.
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Old Oct 28, 2012, 08:29 PM
Jim in San Diego
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I have mold on some cheese
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Old Oct 29, 2012, 10:55 AM
Bunny Hill Flier
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United States, CA, San Juan Capistrano
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I found a moldy rat from a cat kill.
When I cleaned the shed

Rubio
who's cats are always on the "hunt"
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Old Oct 29, 2012, 11:27 AM
Don't ask me anything...
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Lynyrd Skynyrd-On the hunt HQ (studio version) (5 min 29 sec)
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Old Oct 30, 2012, 05:41 AM
Alphabets make great soup
Hamburglar's Avatar
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Well Tuesday's gone... and still no 6oz. Hopefully it gets here tomorrow.
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Old Nov 01, 2012, 02:36 AM
Alphabets make great soup
Hamburglar's Avatar
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Guess what happens when a bladder bursts....................... I can say for certain that my compressor has a much higher flow rate than my vac pump.
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Old Nov 01, 2012, 03:35 AM
Just Toss It !!!
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What a mess huh?!!!
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Old Nov 01, 2012, 04:17 AM
Alphabets make great soup
Hamburglar's Avatar
Australia, ACT, Canberra
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Yeah the moulds came apart and the seam got pushed out. The then the vac bag started turning into an airbag! I left out the compressor this time around so the bladders just at 25"Hg (~12psi). Hopefully I managed to stuff all the seam back in place. Will find out tomorrow.

But man it was a lot easier and faster than laying up a F104 (I did one last night).
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