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Old Jun 17, 2007, 10:35 AM
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Riverside, California, United States
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Next I trimmed the perimeter of the plugs so I could do some real sanding and sprayed them again. I also sprayed the back of the plugs to help them stay more stable.
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Old Jun 17, 2007, 10:42 AM
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Akerman's Avatar
Japan, Tokyo, Setagaya
Joined Jan 2005
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Very nice shape... looks great these "topographic" lines come from the layers of wood the plugs are made from I guess? I wouldnt mind them printing through on the final fuses

Philipp
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Old Jun 19, 2007, 02:42 AM
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Looking mighty fine Joe!
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Old Jun 19, 2007, 03:00 AM
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Belgium
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644 Posts
Looks nice Joe,

My advice to you is to seal the sides of the board as well because if you don't it will absoarb humidity, will grow thicker and distord the board.

@+
Francois
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Old Jun 19, 2007, 03:12 AM
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Belgium
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Don't know if I said this already but for rather large project like yours, I would rather mill a negative "pre-mold" from which a plug can be pulled and hand finished.

The plug would be a fuselage or a wing pulled from the "pre-mold" that is hand finished to the highest level that you can achieve including the fittings like connectors, wing joiners fixing screws , control rod exits fairings etc.

When you are happy about the all plane assembly, you put the plugs back in the pre-molds using the pre-molds halves as perfectly fitting parting boards and you build a composite mold from it.

The reason this slightly longer method is used is that perfect fit is very difficult to get even with CNC machines and a combination of machine+ hand finish gives the best results.

Good luck with your project,@+

Francois
Flybiwo
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Old Jun 19, 2007, 03:59 AM
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Melbourne Australia
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That is an interesting process Francois! Would you be doing that sort of thing for a long production run?

Sam.
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Old Jun 19, 2007, 05:01 AM
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Belgium
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Quote:
Originally Posted by samotage
That is an interesting process Francois! Would you be doing that sort of thing for a long production run?

Sam.
Hi Sam,

Definitely yes.
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Old Jun 19, 2007, 09:43 AM
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Quote:
Originally Posted by Florrain
Don't know if I said this already but for rather large project like yours, I would rather mill a negative "pre-mold" from which a plug can be pulled and hand finished.

The plug would be a fuselage or a wing pulled from the "pre-mold" that is hand finished to the highest level that you can achieve including the fittings like connectors, wing joiners fixing screws , control rod exits fairings etc.

When you are happy about the all plane assembly, you put the plugs back in the pre-molds using the pre-molds halves as perfectly fitting parting boards and you build a composite mold from it.

The reason this slightly longer method is used is that perfect fit is very difficult to get even with CNC machines and a combination of machine+ hand finish gives the best results.

Good luck with your project,@+

Francois
Flybiwo
I have heard of this method and may try it sometime. Right now Im going to try to stay away from the extra labor and see if I can still get a nice ship.

As far as the edges of the board, they will get sprayed on the next application which will be today. It is very dry where I live so moisture and swelling arent really an issue here.
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Old Jun 20, 2007, 07:18 AM
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West Yorkshire, England
Joined Feb 2007
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This all makes my Halfpipe look a bit tame
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Old Jun 20, 2007, 10:02 AM
Challenge is rewarding
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San Diego, CA
Joined Aug 2004
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Quote:
Originally Posted by Florrain
Don't know if I said this already but for rather large project like yours, I would rather mill a negative "pre-mold" from which a plug can be pulled and hand finished.

The plug would be a fuselage or a wing pulled from the "pre-mold" that is hand finished to the highest level that you can achieve including the fittings like connectors, wing joiners fixing screws , control rod exits fairings etc.

When you are happy about the all plane assembly, you put the plugs back in the pre-molds using the pre-molds halves as perfectly fitting parting boards and you build a composite mold from it.

The reason this slightly longer method is used is that perfect fit is very difficult to get even with CNC machines and a combination of machine+ hand finish gives the best results.

Good luck with your project,@+

Francois
Flybiwo
Yes, this would be the way a full production plane would be made. This gives the most detail, best fit, and allows dor all of the extra work to be pre-molded. This extra work is what sets off Cech production quality
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Old Jun 20, 2007, 04:40 PM
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Melbourne Australia
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Mmm, so would things like the canopy recesses, wing root fairings etc all be faired into the pre-mold plug?

Sam,
who likes things from the Czech Republic.
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Old Jun 21, 2007, 09:59 PM
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I think it's important to remember that the cost of these planes is high and for a builder to do all of that extra work to make a prettier plane will have to charge more to compensate for his time. I dont think those cosmetic details add much speed if any to a DS plane. DS planes also get thrashed quickly. I dont want to have to worry about scratching my planes more than I do already. It's down and dirty for me! And fast of course!
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Old Jun 22, 2007, 09:06 PM
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Near the Ocean in Hunt. Beach Calif.
Joined Apr 2006
999 Posts
As it should be . Keep up the good work I saw your 160 up close and the workmanship was superb All of your work is clean and I am watching and waiting for this new project to be finished! Im sure it will equal or surpass your previous work Jimmy
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Old Nov 27, 2007, 07:17 PM
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Riverside, California, United States
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I have taken a break to work on my new 160" Dynamic. I am going to do a build thread on it if anyone is interested. Sorry for the delay.
http://www.rcgroups.com/forums/showthread.php?t=778363
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Old Dec 07, 2007, 04:47 PM
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Leicestershire
Joined Sep 2006
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watching avidly!

Z
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