Monday, December 19, 2011

Building two Nano DLGs - Smashy and Traffic cone.

I know I have introduced this before, but here's the link to the plans.

I've ended up building two of them. They take me roughly three evenings each to build.

Here's the highlights:
I hacked in a power plug so I could power the radio off a 120mah LiPo cell. That reciever is 2.6 grams without the case!

All wired up and ready to go. Looks impressive. Sadly it's got a weight problem. Which leads to it's name. "Smashy"

What a porker. It is supposed to weigh 50g. I didn't pay to much attention to the airfoil shape, or the thickness of paint. I also found out, much to my dismay, that my "4g" servos actually weighed something like 9 grams each!

That's the beauty shot. It's the last time it looked that good. On it's first flight at the park I found I didn't have enough elevator control. The plane made a bee line for the ground and turned itself into a few more peices than it took off in.

You'll notice the lack of carbon reinforcements. There was no carbon tow available anywhere local. I placed an order, but still decided to fly the plane.

Well, lesson learned. Time to make the followup plane. We'll call it traffic cone.
This is a trick I learned long ago. if you want to make accurate parts, glue your plan to the wood.

The bits come out better than die cut. And without laser burn marks. For a plane with all of thirteen parts, this isn't a big deal. I'll go laser on any plane that has lots of parts. :-)

I did the fuselage parts the same way.

It's not perfect, but it's really close. And the trailing edges match when it's stood up. That's good enough for me.

Not bad looking? Almost looks kit like. This is before I sanded the wings.

That's bordering on svelte. The wings, before sanding, weigh 22 grams!

Carbon fiber is so sexy. Especially the unidirectional tow. This stuff is seriously overkill for the project. It was $15 for 50 yards.

I think it looks good. As you'll see, I'm probally going a bit heavy with it. But in my half a dozen flights with Crashy I broke the rudder off four times.

Here the wings are marked for the back half of the airfoil. But I need something to sand them on that's going to provide me with a decent grip on the wing.

My solution was to glue some stops onto a piece of cardboard. This I taped to the counter top so the wing wouldn't move on me while I was sanding it.

Sanding the leading edge took a different technique. The plans come with angle blocks, so I glued the angle block to my sanding block.. and went to town on the wings.

It really went pretty quick. I was using 100 grit paper.

And then I stopped taking pictures.

The rest wasn't very interesting. This is before I cut out the ailerons. The carbon makes the plane really really stiff.

Watson insisted on helping. He sat there and played foreman for fifteen minutes.

I ordered lighter radio gear. I hope to get it in the mail soon, so I can fly this thing at the proper weight.

Speaking of weight. As it stands the plane weighs 43 grams. The battery is 3 grams, and the radio is 3.6 grams.

The next update will be after the plane has flown.

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