100" Hollow Molded Dynamic Build Thread - Page 5 - RC Groups
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Jun 17, 2007, 11:35 AM
Stay in it!!!!
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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Jun 17, 2007, 11:42 AM
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Akerman's Avatar
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
Jun 19, 2007, 03:42 AM
Registered User
Looking mighty fine Joe!
Jun 19, 2007, 04:00 AM
Registered User
Florrain's Avatar
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
Jun 19, 2007, 04:12 AM
Registered User
Florrain's Avatar
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
Jun 19, 2007, 04:59 AM
find me @samotage
samotage's Avatar
That is an interesting process Francois! Would you be doing that sort of thing for a long production run?

Sam.
Jun 19, 2007, 06:01 AM
Registered User
Florrain's Avatar
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.
Jun 19, 2007, 10:43 AM
Stay in it!!!!
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.
Jun 20, 2007, 08:18 AM
EPP Pilot, bouncy is best
This all makes my Halfpipe look a bit tame
Jun 20, 2007, 11:02 AM
Challenge is rewarding
djklein21's Avatar
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
Jun 20, 2007, 05:40 PM
find me @samotage
samotage's Avatar
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.
Jun 21, 2007, 10:59 PM
Stay in it!!!!
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!
Jun 22, 2007, 10:06 PM
The sky is my playground
flyboyjimi's Avatar
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
Nov 27, 2007, 08:17 PM
Stay in it!!!!
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.
https://www.rcgroups.com/forums/showthread.php?t=778363
Dec 07, 2007, 05:47 PM
Registered User
watching avidly!

Z


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