Finished Buzz's 450 for him today. Got the stabilization system trimmed out pretty good.
With it on the helicopter with the gain setting I'm flying the easiest way to describe it is that it flies like a coaxial.
It's almost impossible to do a banked turn with it on (at least a tight one anyway) and it instantly returns to hover when you let off the stick. I hope Buzz has fun flying it, it was a learning experience for me.
Found out yesterday when I installed my new servos that it wasn't a bad servo that caused a crash.
The solder joints in my receiver are bad. Specifically the ones on the Aileron channel. I've had the receiver for about two years, but it still makes me just a wee bit angry that I'm having to spend around $80 (including the cost of the receiver) to rebuild my 450.
As much as people talk about Eflite's "high quality" products I'm just not that impressed. Especially after I took the receiver apart and took a look at their solder joints. Every single pin is a cold solder joint.
In order to fix it I'd have to remove the pins from the pads and solder in a new set without destroying the pads. I think I'll just order a new receiver rather than go through the hassle.
I'm now flying pretty much exclusively in idle up. The helicopter is handling great, tail is holding perfectly even with hard throttle pumps. No blow out at all.
One thing that I've noticed is that my tail servo gets pretty hot during a flight. I may have to change out to a better servo as I can't imagine the amount of heat my servo is building up during a flight is a good thing.
Other than that no complaints, I'm positive the chopper could do mild 3d with a competent pilot at the sticks.
My tail shaft was gunked up and took quite a bit of force to move. I cleaned it off and put some 3in1 oil on it. No more tail bounce.
The HK401B holds extremely well for a $14 gyro. My tail is only kicking out around 10 to 15% going from 60% to 100% throttle instantly. Still haven't got my throttle curve exactly like I'd like it, but things are progressing pretty smoothly.
Posted by Barak1001 |
Mar 31, 2010 @ 04:43 PM | 3,571 Views
Got a couple of more flights in today. I thought that my chopper had a tail wag this whole time, but apparently it's a tail bounce. Meaning that it only happens after the chopper spun whatever direction and I let go of the stick. It holds heading fine as long as it's not recovering from rudder. Even holds pretty well in a 100% throttle punch out.
Apparently the gyro isn't the issue, the issue is my cheap tail servo not being able to keep up with the gyro. I'll be getting a better tail servo to see if that corrects the problem, but until then I'm going to test out adding a slight bit of delay at the gyro to compensate.
Posted by Barak1001 |
Mar 27, 2010 @ 06:56 AM | 3,903 Views
I figured I'd post some type of review on the HK450MT.
My current build has the following parts:
Motor: HobbyMate HB2835 3600KV motor
ESC: HK 40-50a SS ESC
Cyclic Servo: HXT900
Tail Servo: MKS DS480
The kit was well packaged and included almost one of everything you need plus extra screws, linkages, and various parts. The only things missing were r48 and t43, but anyone seriously considering doing a build like this should have some thread lock on hand already.
Quality of Kit:
The kit itself is good quality with only a few things that detracted from it. My main complaints were the screws being too soft and the heads stripping easily and the tail drive gear assembly not being glued well, which cause the gear to move upwards and contact the upper gear. Both are easily corrected. The belt on the kit is an extremely soft material and tends to wear out pretty quickly. Order yourself another one first chance you get.
I got extremely frustrated due to the above mentioned soft screws, causing me to have to grind slots in several of the ones that hold the tail boom in the block, which ruined the washers as well. No extra washers are included in the kit. No instructions are provided with the kit, but you can follow Finless Bob's videos and an Align 450 manual and the build goes pretty smoothly.
Overall Performance: I was eventually able to get +12/-12 pitch (once I figured out what I was doing) and the helicopter seems to...Continue Reading