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Posted by ululi1970 | Sep 02, 2014 @ 07:17 AM | 1,683 Views
I got a couple of cheap HK Red Brick ESCs for a twin-engine warbird conversion.
I have had some luck in the past with them, plus I do not need all the fancy stuff. Both tested fine on the bench, but as I was taxiing the plane for her maiden after the conversion one of the ESC stopped working.
This is actually the first time that I had a problem with a HK purchase, so I am
curious to see how they handle the claim.
I have uploaded pictures and videos of the ESC not working. Waiting to hear from them on the next move.
Posted by ululi1970 | Aug 09, 2014 @ 07:42 PM | 2,344 Views
I have been very happy with my Taranis Rx, running the old r2940 version
of OpenTx 1.0. Being a fan of the old saying "if it ain't broke don't fix it" I have
not jumped on the 2.0 version of OpenTx until today, when I finally took the plunge. What the heck, the weather was forecast lousy for the whole weekend, so I figured I had time to fix any screw-up. To be honest, the whole upgrade was a non-event.
Backed up everything, flashed the new firmware, allowed the Taranis to convert
the eprom to the new format, and added the new folders to the SD card for
the firmwares updates and eeproms backups. Only thing was to change the countdown of the timer to voice. The old one kept beeping, which was annoying to say the least. Now it counts down to zero and then stops.

A really big thankyou to the OpenTx folks. For what I can see, they managed to
make an excellent product even better. Can't wait to start playing with the Lua scripts...
Posted by ululi1970 | May 18, 2014 @ 06:55 PM | 13,943 Views
I confess that I my style of flying is mostly bank it and yank it. I use the rudder on the ground and to do knife edges, but that is pretty much it.
Today I learned that it is really a good thing to learn to use the rudder in flight too! Suddenly, the aileron on my Cub started acting erratically, as is not responding or worse freezing in position. I suspect a power/signal issue on the Y connector.

On top of that, the senior pilot guru was busy teaching a new students, so I was on my own on the sticks, though several club members helped me verbally. Still not sure how , I managed to bring the Cub back with rudder and elevator.

Lesson learned: I really need to learn to fly with rudder.
Posted by ululi1970 | Apr 05, 2014 @ 01:43 PM | 1,876 Views
I built a Sig Wonder from kit some time ago. It is a fun and inexpensive plane to build and fly. Here's a few things that I learned:
1) The wing should be beefed up, especially if you plan to fly it with an engine on the high end of the range. I fly mine with a Magnum .15. Add shear webbing, which adds negligible weight, and makes the wing much more resistant to flexing. Also, I sheeted the entire bottom part. Lastly, I'd suggest to beef up the blocks where the wing dowels attach to the wing. I used 1/16 balsa to laminate the blocks on both sides, with the grain running perpendicular to the grain of the block.
2) Fuselage: Beef up the wing mount, with some tri stock. The bottom of the fuse is a single piece of balsa, with the grain running fore-aft. There is a hardwood rail which is glued to the bottom. On a hard landing (which are not common, the plane generally glides well), the rail pushing on the bottom will cause it to crack along the grain. I see two possible solutions: either use 1/16 balsa to laminate the bottom with the grain running left-right, or, which is what I did, build an extra former using ply and place it an inch or so fore of the last former. That way, the rail is supported by three formers,
3) Stab: I was tempted to add a fillet to help attach the two vertical fins. I am glad I did not. Instead, I just followed the plan, using Titebond II. On a hard landing, the fin will pop away cleanly along the glued seam, without damaging other parts. Also, I made my stab detachable, using 4 4-40 screws to hold in place.

The CG is at 2-3/8" as per manual. I have not experimented much with it, but it flies well and I am not going to touch it. Hand launches are not a problem, though smaller engines may be more problematic.

This video shows a (harebrained) way to take off from a nitro truck.
Sig Wonder taking off from nitro truck. (1 min 5 sec)

Posted by ululi1970 | Feb 12, 2014 @ 10:17 PM | 2,147 Views
Last summer, I got in a trade an old Cub, maker unknown but I suspect Great Planes. It came with floats. It was damaged in shipping, so I had to spend some time fixing things here and there. Finally, last Sunday was good to go.
Our Club president took a few pictures. What a blast taking off from water.
Currently, it is powered with a TT .46 spinning a 11x5 prop. The engine strains
a little, but eventually manages to get it airborne. Need to work on my landings now.