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Old Jul 14, 2014, 12:54 PM
What's goin' wrong?!
ege53's Avatar
Joined Feb 2005
121 Posts
Build Log
Fast Company

I have thought about making a plane like this for a couple of decades. I know it will be a monumental amount of work, but with perseverance, help from friends and family, and advice from fellow RC Groups forumites, I might even be able to pull it off.

I have read quite a few build threads, along with lots of other information, relating to a project like this. I am reluctant to commit to doing a Build Log because the time required just for the Build Log itself will be significant. But, since I appreciate the efforts of other builders' Build Logs, I hope to contribute just a little bit to the overall amount of information.

The Fast Company will be nearly 100% based on VS Sailplanes Rotor and V-Max. Here is a short list of characteristics:

Pitcheron wing, and maybe a canopy air brake
2 Meter span using the S6062 airfoil, 7" root, 4" tip, straight 25% MAC
100 degree V tail using NACA 0006 airfoil
48" long fuselage

These following threads have been quite influential to me:

BillO's Zmax. http://www.rcgroups.com/forums/showthread.php?t=974539
Hutch's Sushi. http://www.rcgroups.com/forums/showthread.php?t=460568
Reed's Jart. http://www.rcgroups.com/forums/showthread.php?t=259967
blewis01's Tribute. http://www.rcgroups.com/forums/showthread.php?t=892925

In the beginning I am making a fuselage plug. I used 1/4" layers of MDF, laminated with TiteBond glue. I have slathered on several applications of epoxy, and I am getting ready to fair the surface with Bondo. . . . . and a whole bunch of sanding!

Eric
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Old Jul 14, 2014, 10:37 PM
Firecracker!
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San Francisco & Santa Cruz
Joined Oct 2004
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Deja vu! This will be a great project, I learned a lot on mine, I've built several now and they just keep getting better and better. Good luck with yours Eric!
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Old Jul 14, 2014, 11:45 PM
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San Diego
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Best of luck to you, please keep the pics coming!
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Old Jul 15, 2014, 02:10 AM
Geppetto
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United States, CA, San Francisco
Joined Dec 2005
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Dude! I'm watching!

Geppetto
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Old Jul 15, 2014, 10:00 AM
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Awsome
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Old Jul 15, 2014, 11:52 AM
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United States, CA, Tehachapi
Joined Jul 2004
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I am with ya man. Document as much as you can for us please. Trying to clear some other builds so I can begin the plug for my own 2 meter, but a wingeron. I am using MDF as well. I love VS models, but mine will be more in the Scepter ish family. Not a knock off, just influenced. Wilkerson's comments he made about people copying his design, how he felt about it (and I agree totally) and why people don't create their own is what finally prompted me to get busy.

Good luck man.

Jim
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Old Jul 15, 2014, 01:32 PM
Less Whinning, More Flying
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SF Bay Area, USA
Joined Feb 2003
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I've seen the plug in person and Eric did a beautiful job of it. The pic doesn't do it justice.

Sean
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Old Jul 15, 2014, 02:39 PM
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Have fuse- will follow.
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Old Jul 15, 2014, 03:02 PM
that's gonna hurt...
USA, CA, San Jose
Joined May 2005
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Quote:
Originally Posted by Sailhigh View Post
I've seen the plug in person and Eric did a beautiful job of it. The pic doesn't do it justice.

Sean
Agreed Sean, but equally impressive was the jigs Eric built to shape the plug.

Eric - thanks for posting ( and the links were pretty cool too! )

Bruce
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Old Jul 15, 2014, 05:15 PM
What's goin' wrong?!
ege53's Avatar
Joined Feb 2005
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Jigs

Thanks for the comments.

Since Bruce mentioned some of the jigs, here are two photos of the foam pieces I cut to hold the plug while shaping.

Eric
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Old Jul 15, 2014, 06:59 PM
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Eric that is one way to get the angle, simple and if done right effective. Nice to see a different spin on things.

Jim
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Old Jul 16, 2014, 01:06 AM
Geppetto
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Looking good Eric! Keep it rolling!

Geppetto
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Old Jul 17, 2014, 05:58 PM
What's goin' wrong?!
ege53's Avatar
Joined Feb 2005
121 Posts
Defects and sanding

I tried to wet sand the surface epoxy, and got into a bit of trouble.

I think the first layer of epoxy was thin in some spots, and those places got worn through down to the MDF, allowing it to swell a bit with the water. Subsequent layers of epoxy and further dry sanding left some defects in the surface. I was using 220 grit sandpaper and the affected areas stood out from the unaffected areas.

I scraped the ten or so defects so they are now a depression in the surface. I dry sanded the whole plug with the 220 grit and I am getting ready to apply some Bondo.

Eric
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Old Jul 17, 2014, 06:04 PM
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Eric, what type of epoxy are you using. You could go for something thinner so it pent rates deeper into the MDF. But bondo works.

Jim
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Old Jul 17, 2014, 11:32 PM
What's goin' wrong?!
ege53's Avatar
Joined Feb 2005
121 Posts
Epoxy

It is TAP Plastics house brand epoxy.

For the first layer of epoxy I tried to skimp a bit because I don't like to be wasteful. For the first layer, at least, that was a mistake. Sometime in the future if I make another MDF plug, I will really pour the epoxy on the MDF and massage it into the entire surface with gloved hands.

Eric
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