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Old Nov 23, 2014, 08:48 AM
Aerotow and sloping Holland
MaartenX's Avatar
Joined Mar 2012
299 Posts
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Paul Janssens Mig 3 PSS

Hello there,

My next project will be a Paul Janssens Mig 3.
Lost mould fuse and styro obechi wings.
I'll stick to the original wingsections, E 374 10% at the root and E 374 12% at the tip.
So far my crunchy slope stuff was balsa / ply, this will be my first glass fuse.

I've started with making a plug:



Needs some work but you'll get an idea of the shape. Slightly slimmed the fuse, the original is fairly wide.

I plan to use the lost mould method. Here is my first question: can I glass with epoxy directly over the plug and after glassing use aceton to remove foam?
Another method is to cover the plug with brown tap, wax it and glass the plug.
I could use polyester then.

In my youth I made surfboards so working with resin I'm not afraid of.

Any advice is appreciated.

Regards, Maarten
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Old Nov 24, 2014, 04:01 AM
Registered User
Australia, NSW, Hornsby
Joined Jul 2005
908 Posts
I'll be watching with interest.

My advice for what it's worth with a couple of these under my belt now..

  1. Tape the plug & try to get it as wrinkle free as you can.I was fairly pedantic with the Mustang & it came out really well. I rushed the Dewoitine & the results were nowhere near as good & it required a lot more filler & sanding. The LA5 got a bit more care & again the result is much better. Tape it & take care to minimize wrinkles. You'll be glad you did later. If you don't tape it the Acetone will leech the foam through the glass & make a hell of a mess.
  2. Wax the tape. I didn't wax the tape in the Dewoitine & getting the tape & foam out has been a nightmare. The Mustang was easy. I just used furniture wax but pretty much anything would do.
  3. Once waxed let it dry & then use spray contact glue to stick the glass fiber on one later at a time, respray with glue & do the next layer. I've had 3 layers of 6oz & 1 of 3oz (+ 1 layer of carbon around the wing seat) & the epoxy penetrated no probs. If you do it this way you can fix up any overlap issues before you're racing the clock with mixed resin.The glue sticks to the wax ok but releases much easier when you're trying to get it out after you melt the foam.
  4. Slimming the fuselage is probably a good idea. The Dewoitine fuselage is fairly close to scale & it's a porky little bugger.
  5. Think about your elevator linkages before you get too far. I didn't plan ahead & now I'm having to do a lot of head scratching as a result.
  6. Take lots of pics. I'm keen to see it progress.
Have fun.
Al
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Old Nov 24, 2014, 06:07 AM
Aerotow and sloping Holland
MaartenX's Avatar
Joined Mar 2012
299 Posts
Paul Janssens Mig 3 PSS

Thanks for the advice Al. Appreciate it.
I was wondering wether the spray glue would work on wax but you cleared that up ;-)
Applying several layers of glass first before laminating is new for me.
I'll try that.
Got the linkages figured out, check.
I've got several PJ plans here, busy winter ahead :-)

Regards, Maarten
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Old Nov 24, 2014, 11:21 AM
Livin ...The Endless Summer
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United States, CA, San Juan Capistrano
Joined May 2011
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I will be watching and learning. Thanks for posting.



Rubio
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Old Nov 24, 2014, 11:26 AM
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The same here !

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Old Yesterday, 12:02 AM
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United States, CA, Costa Mesa
Joined Oct 2009
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looking good so far

i have a question:
why remove the foam.can you just dremel away the foam where you need to put stuff.
is there benefit in the added rigitity
thanks, steve
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Old Yesterday, 04:17 AM
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Australia, NSW, Hornsby
Joined Jul 2005
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You can leave the foam in if you want to. It certainly makes them stiffer if you leave it in.

The Dewoitine is a similar size & after melting out the foam & removing the tape it was roughly 300 grams lighter. When the planned AUW is around 1200grams that's a fair weight saving. If you're building a sled then it doesn't matter.

Cmon Maarten, how about an update. I've been slack so need to build vicariously through you.
Something to get you motivated perhaps.
http://img.wp.scn.ru/camms/ar/457/pics/1_53.jpg
http://img.wp.scn.ru/camms/ar/457/pics/1_65.jpg
http://img.wp.scn.ru/camms/ar/457/pics/1_92.jpg
http://img.wp.scn.ru/camms/ar/457/pics/1_110.jpg


Al
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Old Yesterday, 01:08 PM
Aerotow and sloping Holland
MaartenX's Avatar
Joined Mar 2012
299 Posts
Thanks for the comments guys.

OK Al here ya go:

Plug is ready for taping. I think it is pretty smooth



I used brown packing tape for covering



I listenend to Al and took extra care in getting the wrinkles out as much as possible.
It is amazing how well this stuff shrinks when using a warm covering iron.



Plug is ready for waxing and glassing.

I have both epoxy and and polyester resin available. I used to laminate surfboards with epoxy.
I am leaning towards polyester this time. I know for a fact that Paul Janssens uses polyester. Dries faster and lends itself for sanding a little better.
Any comments?
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Old Yesterday, 01:59 PM
Aerotow and sloping Holland
MaartenX's Avatar
Joined Mar 2012
299 Posts
@ Steve: I'll be taking the foam out this time. I'm not building a lead sled. Might try that option another time.
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Old Yesterday, 02:29 PM
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United States, CA, Costa Mesa
Joined Oct 2009
643 Posts
Thanks guys
I didn't think the foam would add so much to the weight.
Will follow this thread closely.
Because of the added strength I end up using less glass but maybe
End making a weaker fuse
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Old Yesterday, 02:35 PM
Livin ...The Endless Summer
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United States, CA, San Juan Capistrano
Joined May 2011
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Looks great My Friend.

Polyester is cheaper.
I get it at a surfboard glass shop in the surf ghetto.
11.$ a quart.

Rubio
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Old Yesterday, 05:44 PM
Aerotow and sloping Holland
MaartenX's Avatar
Joined Mar 2012
299 Posts
Seems like a killer deal Rubio
I get my glass and resin at a specialty store. Slightly more expensive but great stuff. They have all the glass, carbon and kevlar that you can think of.

Also bought this release wax:



put two coats on the plug. After that I sprayed the plug with contact glue.
Put the glass on. Amazing how well that works. Never imagined that I could use spray glue over the release wax. THANKS AL!!
That is one good tip.



I'll try to laminate the plug tomorrow after work.

Regards, Maarten
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Old Yesterday, 06:04 PM
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How many layers of what weight glass did you use
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Old Today, 02:25 AM
Aerotow and sloping Holland
MaartenX's Avatar
Joined Mar 2012
299 Posts
Quote:
Originally Posted by steeg View Post
How many layers of what weight glass did you use
Steve I use 2 layers of 160 grams/ sq metre and 1 layer of 80 grams/ sq metre.
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Old Today, 05:03 AM
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Australia, NSW, Hornsby
Joined Jul 2005
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Looks flasher than a rat with a gold tooth.

Al
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