A Useless Geek's blog View Details
Posted by A Useless Geek | May 03, 2009 @ 06:33 PM | 5,396 Views
Well, those little Blue Arrow 3.6 gram servos aren't so great for anything over 150 grams or exceeding a walking pace. The Pink Passion went in nose first when the servos couldn't raise the elevons against the airflow in a shallow dive.

Oh, well.

So, I put in some Power HD-1600As that I still had lying around, cut off the vertical stab, reworked the front end, and added some ventral fins for stability. With the original Zippy 500 15C 3S it worked okay. Then I went to a Flightmax 500 mAh 15C 2S spinning a 7x6, and the CG was way too far to the rear. Okay, go to an 800 mAh. Much better.

This beater now hangs to the left all the time. I didn't measure anything when I CAed the fins on, so there is prolly a huge left bias in the vert stabs. No matter; I gotta take off some Depron up front because it's all bashed up anyway, so that'll give me the excuse to rework the mess properly.

Really, I don't know why the simplest of toss-off projects have to be the ones that eat up the most time and effort. What's up with that noise?!?

Postscript: The Pinky suffered too much ground rash, so I ended up stripping it. I'll build up this idea again in the near future using a little bit larger wings. I think I may do a sort of hybrid of the dorsal/ventral fin ideas; some smaller wingtip fins on the bottom of the wings to supplement the main rudder on the top. We'll see.
Posted by A Useless Geek | May 01, 2009 @ 03:20 AM | 4,886 Views
This is what happens when you throw some leftover parts together without any planning; you get a 180 gram, mediocre performing, fairly ugly park "jet." Not exactly fast with a Turnigy 1811-2000 providing power through a GWS 5x4.3. I ended up using a 3S pack because I couldn't fit a larger prop on there to take advantage of a 2S.

The servos are Arced D531BB-v2 digital units left over from a clapped-out Dualsky Breeze Pro that didn't last too long in my clumsy mitts. My first outing with this bird was at the golf dome, where I had way too much power and a horizontal stab at the top of the fin that apparently provided some up bias. The thing was uncontrollable. Ick. I incorrectly blamed the servos.

Motor control is through a Turnigy Plush 6A with the jacket removed and replaced with some stock heat shrink. I needed to change the motor wires right at the board, so the old shrink jacket went away.

Not much to look at. Flies like kaka at slow speeds, so I really can't fly it in the front yard. Oh, well. I guess the lesson here is that you really need to plan out this stuff before cutting up a lot of foam, even if it's just pink Owens-Corning stuff.
Posted by A Useless Geek | Jan 29, 2009 @ 04:55 PM | 4,629 Views
So, I took one of those $4 K-Mart gliders (that I paid $5 for at the LHS) and turned it into a Spetrum-controlled foamite. Gonna fly this one at the dome tonight, too. Once again, we'll see.

The power is two 100 mAh 20C cells permanently mounted in the nose. This thing is just like one of those $20 R/C foamies, only it costs five times as much.
Posted by A Useless Geek | Jan 29, 2009 @ 02:27 PM | 4,220 Views
Yeah, well, I picked up a really mangled old Parkzone Ultimate 3D at the Barnstormer's December meeting/auction. This thing was so rough I had to completely strip it and rebuild it. Lots of new foam, glue, carbon, etc. Since I knew it was gonna be heavier I decided to add some more wing surface. I don't have wheels on it yet, but it should fly okay as it is. I'll be trying it at the dome tonight.
Posted by A Useless Geek | Jan 20, 2009 @ 07:30 PM | 4,184 Views
My aircraft may not be all that swift (yet), but I gots my own bad sef a pretty spiffy hat. A little time with some marker pens and...
Posted by A Useless Geek | Nov 28, 2008 @ 03:07 PM | 4,775 Views
I don't know where I got this beater, but a bad Dean's knock-off male Ultra showed up in my bag o' tricks. The bad one is only marked on the vertical pin, and it is marked positive. See the pic.

The knock-off is very well made, using gold plating and plated spring steel for the tensioner. It is visually identical to a real Dean's except for the bad marking.

Sorry that I can't identify where this turd came from. I have gotten so much stuff from so many different vendors over the last couple of months that I couldn't ID the source to save my life. But hopefully this alert will save your electronics package.
Posted by A Useless Geek | Nov 27, 2008 @ 01:14 PM | 4,485 Views
Okay, so my MSComposit Mini-Swift wing flies kinda crappily out at the golf dome. I still like the EPP wing idea, a little. Enough that I am willing to try out another Swift, this one a medium size unit. However, I want it to be a little softer than the Mini, so I'm injecting a little dihedral to smooth it out some. That is accomplished via a strip of balsa trailing edge material. The angles between the sides seems just right in getting the dihedral set.

I mounted the motor to the top side by using some more of the same trailing strip balsa. We'll see how this works out.
Posted by A Useless Geek | Nov 24, 2008 @ 03:55 AM | 4,597 Views
Okay, so I got one of those 2500 mAh 3S transmitter packs (http://www.graysonhobby.com/catalog/...roducts_id=778) from Grayson. Put a .1" two-pin female connector from a computer LED on it, and I'm in biz. Attach some Velcro to the battery, some more inside the battery compartment, and now I can fly for a week without worrying about Tx charge. See the pics.

The pack will stay in place very firmly with Velcro. This pack has a balancing connector on it, so you can charge it via your regular charger. An inexpensive solution.
Posted by A Useless Geek | Nov 13, 2008 @ 12:20 AM | 3,941 Views
Man, there are so many possibilities. Everybody out there has an idea on what to build and how to fly. I see these guys putting together ultralight EPP biplanes and doing wingtip-dragging rolls right off the ground. I see guys scratch building 1/60 and 1/45 scale warbirds that just make my mouth water. I see flat F-22s and SU-37s that zoom in and out of the frame so quickly that the camera can't even get a single good image of them. I see scratch scales of Beech, Piper, Cessna, and all kinds of other private planes. I see weirdness abounding, most of it expressed in blue foam. Stuff like flying saucers, hotdogs, pseudo-helicopters, zeppelins, even a Holy Cross.

I don't know what to build.