I stayed home sick from work this week and built and flew my Poseidon. I was really sick, honest!
I got the Poseidon from H-L for 199. I got a Scorpion 2221-6 motor and 55A ESC. I used HS-65MG for the swash and an Airtronics 94761 with Futaba 401 for the tail. I used Spectrum 6100e RX. I used Align white CF 325 blades.
This bit on the build may seem like a rant but it's just to give you a heads up on what to look out for. I'm not going to point out the cool stuff, which is everywhere. My kit was partially built, but nothing had been Loctited. Make sure you rebuild every single piece, it goes quick since you can allready see how it's put together. I also found a few spots where the factory builder was careless. For one the washers between the blade grips and the mixing arm bearings were omitted causing the mixing arm bearings to drag. I found some spares and fixed that. One of the tiny screws on the tail pitch link was completely stripped so I glued it in and will have to keep an eye on that or replace the links. One of the long bolts running thru the servo mounting platform was too short and didn't have more than a couple of threads into the nylock bolt. Small things but it shows you can't blindly trust a workerbee in a factory with your heli!
The frame will take some getting used to, the frame is very loose, the tabbed parts are trick but move around a lot. Some are annoyingly small. I mean the battery tray or receiver tray are scalloped and cut out so much there's little left to mount to. I made a new battery tray out of CF (messy business) and it gave me a better mounting surface. I left off the top ESC tray and mounted my ESC to the aluminum cross bars. I put some shoo goo glue on the tabs for the gyro tray so the gyro wouldn't be able to move independantly of the rest of the frame when the tabs slide around in the slots (duh!) and some glue on the anti rotation bracket tabs as well. What you will find is that some tabbed parts are held in place with screws thru metal parts and don't move, the motor mount for example. But some tabbed parts are allowed to move a bit in their slots. This is not like a Trex where the tabs are tight in their slots. The main landing gear is something else. I like the way it is allowed to move around (tabs in slots again) but with foam rubber damping. It works really well and stays together better than I thought it would.
I spent a lot of time on the main grips. They received some bad press on another site and I found them to be tight out of the box. At first I focused on the plastic main rotor bearing tubes which go between the O-ring head dampers and the grips. I whittled them away to nothing but the grips were still stiff so I replaced them with JR servo grommet brass eyelets cut to the right length, a tip from another thread (now that's fiddly!) But that doesn't seem to fix the problem so I studied the design and looked at my other heli's manuals (Lepton,Trex600's E&N) and they all had their thrust bearings at the outer end of the spindle outside of the bearings. This made more sense to me as now the full weight of the grips and bearings would load the thrust bearings against the spindle bolt. So on my heli I have the dampers, then the bearing tube, then the grip, both bearings together with no washer between them (couldn't see the need), the large washer, then the thrust bearing, a small washer (just for more surface area to load the thrust washer) and the spindle bolt. I was finally happy with the smoothness and freedom of the grips and it flies fine. So there! Beware the large ball link at the flybar linkage ball, mine were very tight but freed up with the old plier squeeze trick.
The Canopy is easy to trim but it is tight to the body. It fits the mounting posts perfectly. I had to relieve the area around the swash a bit on either side of the marked cutout or the swash would bind on it. I also cut two eye shaped openings in the canopy and the diamond indents on the sides to allow more airflow around the ESC and battery. This lowered the temps of the ESC especially about 15-20 degrees.
Bench setup was easy and very different! There isn't the usual bunch of linkages to play with here. I had positive pitch at center stick and I wanted a 0-50-100 pitch curve in my TX so I had to grind more of the hollowed pitch linkage rod threaded part and relieve the ball links a bit also. When I was done they were just a ch under 62mm overall. Now I had 0 pitch at mid stick and voila! everything else was perfect. What a neat head design. Just set your swash AFR to whatever pitch range you want. And the sky seems to be the limit on this one. +-12 collective is easy and worked well for me in flight. Cyclic can be as large as you want so I started with a reasonable TLAR. It will be fun to see what works best at the field. I used the high rpm tail setup.
So I set the heli up and run rpm checks with the 10 and 11 tooth pinions, 3390 with the 11t and 3350 or so with the 10 tooth. I used the 10 tooth because the 11t pinion appears to be too much load for this 4400 KVA motor and it caused the ESC to heat up excessively. The amazing thing is you would never guess this high an RPM just standing there. The mechanics are ridiculously smooth. The best I've ever seen.
Flying was a non event, this is the most stable small helicopter I have flown. When I think back to my first heli, a Shogun, it would not sit still. Then a well built and blinged Trex 450, fun but a complete handful, I was just trying to keep up with that bad boy! I sold it rather than try and detune it. I even tried a Hornet, fun but what a handful too, very fidgety. I found my nirvana when I got a mini Titan. What a sweatheart! I could finally do my kinda lame 3D moves in a small space with confidence and a normal heart rate, it flew more like my big heli's, with grace and precision. Well, the Posiedon is cut from the same cloth as the MT. Even more so! The way I have it set up it seems to be even more powerful and bigger feeling in flight than the MT. It would be difficult to choose one over the other and that is high praise. The Poseidon is a great try at a better technology mini heli. The head, servo mount system and tail are just sick! The fact that it purrs like a kitten while turning over 3300 rpm is sick! The ease of setup and range of pitch adjustment is just... well, you got it!
So if this is your first heli get a plastic MT. But if you fancy yourself a good builder with some engineering sense and you allready have built a bunch of cookie cutter heli's man go for it. It'll be worth it when you see how well this thing can fly. I'm lookin' to blow some minds when I get to the field saturday morning