Category Archives: R/C

KISSed out Alien: ARGHHHHHH!

Finally building out my KISSed out Impulse RC alien.

Trying ESCs on for size.
Trying ESCs on for size.

ESCs soldered to motors, PDB, and to KSS FC. Powered up and smoke checked without issue.

Motors reversed as necessary.

All soldered up and ready for a flight controller.
All soldered up and ready for a flight controller.

Micro MinimOSD configured and flashed with KISS OSD firmware, tested, attached in line and mounted piggyback on my HS1177.

Running my Micro MinimOsd piggyback on my HS1177. Needs a dab of hot glue to lock down the wires.
Running my Micro MinimOsd piggyback on my HS1177. Needs a dab of hot glue to lock down the wires.

Finally soldering up the power leads to the FC and…F*CK! While soldering the negative lead, I ended up with a gob of solder on the backside of my solder tip. The solder took a small SMT capacitor off the board, and I lost both the gob of solder and capacitor when I cleaned off my tip (before I realized the cap was even gone).

FAAAAAAAAACK!
The tiny capacitor just disappeared…couldn’t even tell it was gone at first until I pulled up a picture of a new FC…

Emailed Flyduino support to ask if the capacitor was necessary and if I could power the board without it…hoping it was only there for an obscure feature like running a Spektrum satellite receiver or something. I even asked if they could provide me the component value and size so I could order a couple from mouser and try to repair it myself. They said they would investigate and get back to me. Unfortunately its now been a couple days, I’m still waiting and given how busy they probably are, doubt I’ll ever get an answer.

In the meantime, I ordered a new board from Rotor Riot…just waiting for it to arrive so I can de-solder everything and try and get her in the air.

Ugh…

Update:

The new board I purchased from Rotor Riot showed up and I had it installed in an hour. Quad flies great, and is a HUGE improvement over my previous hunk of junk. A day or so after the new board arrived, the folks at Flyduino provided me with the value and type of part that I accidentally knocked off along with a link to DigiKey (making ordering a replacement a snap).

I placed an order (ordered 10 since they were only $0.16 a piece). When they came in I was able to get the board repaired with a little cursing and a little care. So, thankfully I have a backup board (or a board for my next quad) rather than a keychain or mirror hanger.

 

HobbyKing Mini Composite DLG Build

Well, HobbyKing managed to suck me in with their Black Friday sale this year. I’ve been teasing myself with the possibility of a Discus Launch Glider (DLG) for the past year, but kept shelving the idea because of the initial cost (even the budget-minded Libelle will be ~$200.00 to get in the air), so when I saw the 2 channel HK Composite DLG ARF on sale for $39.00 I had to jump at the opportunity.

All Dressed Up
All Dressed Up

Parts List for this Build:
-HK Mini Composite DLG: $39.25 (on sale)
-2S 300MaH nano-tech: $5.95
-Orange R615X Receiver (Overkill, but I had one on hand): ~$10.00
-Assorted JST connectors: $1.11
-Home-Brew BEC: ~$1.00 in parts

Orange R615X, LM7805 BEC, Turnigh Nano Tech 2s300MaH Batt.
Orange R615X, LM7805 BEC, Turnigy Nano Tech 2s300MaH Batt.

The glider showed up a week later and overall the construction impressed me. Covering was tight, wooden joints appeared to have sufficient glue, and all the aerodynamic surfaces were straight and square. The tail boom appears to be unidirectional wrapped carbon, and the connections to the fuselage pod up front felt sturdy (only time will tell). The wings are one piece with a healthy dose of dihedral (you know, no ailerons and all) and had a finger peg pre-installed for a right handed pilot (they include a second carbon peg for lefties too). The vertical stab is glued into the tailboom out of the box, and the horizontal stab and wing attach with a couple of screws.

After mounting the horizontal stab and connecting the pushrod to the elevator I quickly discovered the biggest flaw with this model: lack of pushrod support. The pushrods for the rudder and elevator are thin (0.020″) wire and are only supported along the tail boom every three inches. With any resistance on the rudder or elevator the pushrods buckle resulting in mushy control throws for up elevator and left hand turns which put the pushrods in compression. This should be an easy fix in the future, however I decided to build the model as-received to see how much of an issue it would be given the low weight of the glider.

One thing HK did right was provide plenty of room up front for the 300MaH battery,  de-cased RX, and BEC. RX was attached using some double sided foam tape, and battery was held down using a strip of electrical tape for easy removal during charging.

Plenty of room up front of electronics.
Plenty of room up front of electronics.

The 6ch Rx and 3s 300MaH battery (both total overkill for this model) resulted in a slightly nose-heavy model so some paperclips were added to the end of the tail boom to bring the model into the recommended CG range. The paperclips can be easily removed down the road when I add additional weight to the tail to stiffen the pushrods, or swap out the Rx and battery for something more sane (HK Orange R410 Rx).

High Tech Balancing System
High tech tail weights

After everything was stuffed, I powered her up and set the recommended control throws in the radio. I had to set servo throws biased in one direction in order to compensate for the pushrod flex, but it all worked out to get me into a flyable range.

Maiden consisted of a couple of gentle overhand style tosses to make sure the CG was in a flyable location (you never really know what to expect with the recommended CG and control throws from HK) and then some very light discus tosses. The glider felt slightly  tail-heavy, which was remedied by pulling one of the paper clip weights from the tail boom. Properly balanced, I attempted a few (more powerful) launches and easily achieved altitudes of ~50-60 feet and glide times of 20-30 seconds.  The glider tracks straight during launch, and down elevator and left hand turns did result in the expected mushiness due to the control rods buckling under compression. The quick maiden turned into an hour out in the park experimenting with different launches until my hands went numb from the cold. The model flies great (even in a light breeze) and almost doesn’t want to land; a slight breeze blowing over the trees was enough to create some lift an extend some of my flights by more than a few seconds.

TOW of 5.6oz (158.7grams)
Flying weight of 5.6oz (158.7grams)

I can’t recommend this DLG enough as an intro into unpowered flight. I’ve had the model out a couple times this winter as weather has permitted and enjoyed each time.  In the end, the only downside I see with this model is that people who find out they do enjoy flying DLGs will quickly outgrow this tiny, 2ch, balsa-winged model (I’m already looking into full-blown glass/carbon models). Those who aren’t quickly hooked will be left with a fun model that they can take along anytime and fly anywhere.

Future Improvements to Look For:
-Smaller 3-4Ch Receiver
-Supports for pushrods to prevent buckling.