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Old 10-25-2007 | 05:24 PM
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MHester
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From: Woodstock, GA
Default RE: Black Magic VF3 Build Thread

Looks good!

After seeing some failures on the 2s, I discovered that the main weakness in the 2 was that the edge is essentially only bonded to the 1/8" doubler at the sides. As long as you never have a bad landing or don't drop it in hard in grass, you won't break it. (err ok SHOULDN'T, you should see what mine went through!)

From the pic you can see how I addressed this on the VF3s. All it needed was that extra little doubler over the top, and all is well. A couple bazillion flights and not one VF3 gear failure to date.

One thing to take SPECIAL note of is that any time you are glueing to the carbon laminate, you MUST rough up the carbon with 80 grit paper (knock the shine OFF) and clean it thoroughly with acetone before glueing to it.

Scott if you'd like I can drop you another piece of nomex in the mail tonight seeing as how you used it to go behind the gear block.

There have also been some reports of flexing of the electric firewalls on the 2s from a couple of folks. Take time to insure that with your motor mounted to the plane, you don't have any flex. If you do, brace up the area. We haven't experienced the problem here but after sharing a lot of info, ideas and pics, it's definitely worth mentioning. Because during the building stage if you have this issue, it's not a big deal to brace it up. After your plane is flying, it's a lot more difficult. the problem I have is that I have not personally seen one flex for myself, so it's hard to figure out how to avoid it if it happens. I've been working on a torque box mount for months and every time I get one done, I end up scrapping it because I hate it. However in the future at some point I'll redo the electric firewalls for this option.

I'm about to leave for Crowley and will be gone until monday, so if it's an emergency call me on my cell and leave a message.

Cyaz!
-Mike