Today I wanted to get the servos centered, install the Emax DS9257 tail servo and set the tail up mechanically. Some Trex 500 bling I had ordered from A Main Hobbies also arrived, wicked fast shipping! In addition, much to my surprise as it usually takes days to even get a shipping notice, the HobbyWing FunFly 80Amp ESC OPTO arrived today! Honestly they have been shipping pretty quick lately. I noted earlier, I also decided to make this heli FBL by taking the BeastX off the EXI 450 and put it on this heli today, so I also would be setting that up... which is the idiot and the BeastX part...
So, I soldered a JST connector I stole from one of my old 2S batteries for my Walkera CB180 onto the battery leads of the FunFly ESC, soldered on the EC5 and stole the female pins from the HURC 60A I had originally installed on the HK500 and soldered them on the other end of the ESC. Programmed the ESC with my HobbyWing card in 10 sec, and installed it. Uninstalled the exisiting tail and boom fins and put the Trex 500 ones on, sweet. Installed the tail servo, set up the center and tightened everything down. I prefer boom mounted servos, and use Finless Bob's tail set up marking the limits on the control rod and centering the servo, then centering the marks (I don't bother with the tail geometry he uses by changing the blades to leading edge control (or is it the other way around?)). I have that on one heli and honestly see no difference. Tested the servo with a servo tester. All set.
And then the adventure began, as the idiot fought to slay the BeastX...
Normally this whole process would have taken less than 5-10 minutes... It would take 3 hours including a dinner break and a good dump. Then it took 5 minutes... So here's how it went. It took a couple of seconds to remove the BeastX from the EXI 450. I brought the three BeastX leads, cut some anti-vibration gel, and installed the BeastX on the HK500, behind the elevator servo on the gyro platform. Sweet. I connected the BeastX to the reciever, powered it up, and put it in programming mode and reset it to factory settings. I then went back and did the primary setup, exited, and went back to the main flight paramenter set up. Now, this usually takes a couple of minutes, but when I got to the centering Step G I couldn't get the servos to allow me to center them, they moved odd, would not accept inputs, some wouldn't move at all. This was wierd... I tried the best I could but decided to move on. I didn't like this... Step I, I could not get the swash to move correctly. This is the step where you use standard combos to get all tihe servos moving in the right direction. In fact, the servo movements made no sense... the elevator moved in roll, some of the servos didn't move at all, if they moved they would barely or overdrive. I went through every combo, I reversed this, that and the other servo, I checked everything five times, I swapped wires and channels, I went back to the beginning and re-did everything, checked my setup selections, checked channels and plugs, checked servos on the tester, reset evrything and did it again, and it was insane! What was it? The servos? Does the BeastX not work with analog swash servos? Did I pick the wrong freq? I looked online... I re-installed the latest firmware. Finally I had to take a break. I was sure the BeastX was fine, I was surely doing something fundamentally wrong... My eldest and I went to the local Chinese buffet and I stopped thinking about this BeastX issue for a while. Drove home thinking I really didn't want to call Horizon Hobby and work this out, and I didn't want to send it in for service... I grabbed Model Airplane News and headed to the head. In the middle of my dump it struck me, as my best ideas often do: I had never reset my DX8 from 120 Mix to Single Servo... What an idiot... this is the very first thing they tell you to do. After my constitutional I went upstairs, reprogrammed the DX8 to Single Servo and in 5 minutes had the whole thing done. It works perfectly. For the love of Pete... its always something.
I used 65 Hz for the analog Hitecs, having looked on line and finding nothing about what freq they operated at, but knowing 55 Hz would work. I saw a Helifreak post where I saw most people using these servos had no issues and were recommending 65 Hz. Works fine, now that my frickin' transmitter is set up properly. I used the Futaba DS9257 settings since the Emax is a clone, and that works fine too.
I set her up 6S and spun the motor up, checked swash movement, vibration, tail response, all jolly! I estimated the pitch setup, but used my BeastX bevel box to set up the 6 degree roll in programming. Since I had the battery pack in place I went ahead and fitted the canopy. To get over the batteries she sits a bit up, but looks sweet! I moved the canopy pins from aft over the elevator servo, up to where the rubber bumpers were just above the battery. Worked great! Looks awesome!
Now, just waiting for the Tarot 500 FBL head to come in, install it and set up the swash pitch, and she is then done and done! Unfortunately I think the head won't get here until after the holiday, and I will be away travelling for work...
The flying monkeys got me...
Helis, Fixed Wing, RC Sailing
AMA 957918
Pirate Kid Skeleton by RadDezigns.
Monday, July 2, 2012
HK500cmt Build Day #2
Servo day yesterday, after a long day flying (a damn good day, see previour post). Installed the swash servos, Hitec HS-225mg analog servos on the HK500, and that was about it. Snug fit.
Incidentally, I also installed the Emax DS9257 tail servo on the HDX500 and set it up with the Align GP780 gyro. That was it!
Incidentally, I also installed the Emax DS9257 tail servo on the HDX500 and set it up with the Align GP780 gyro. That was it!
In order to get the pitch and aileron servos to fit as they abut (see below) I had to use the rubber grommets, which I like to use anyway.
Pitch servo set up.
Aileron and pitch servos in place, snugly abutting but not jammed in.
Install complete. Time for a Jameson's...
Projects
The stock canopy for the HK500 is coke bottle plastic, so I set it aside and took out a cracked 500 size canopy that had come with my HDX when I bought it used a couple of years ago to use instead. I epoxied, Bondo'd and sanded it down, then using rattle cans painted it with primer then the below paintjob. I hadn't panned on this as I was going to paint it all green, but then I saw how the overspray looked on the cheeks of the canopy and decided to go with it. The paint of the yellow canopy of the HDX was also cracking along stress lines, so I sanded it down, epoxied a few weak points, then did the same thing. They came out pretty nice! I coated them with clear lacquer. Sweet!
I like using the foam heli landing pads to keep the tail rotor out of the dirt and grass. I had several and have given them all away. So I am painting up one for myself. I will stake it down, but I have never had one flip up. They take a lot of masking and time but are pretty easy! Yeah, this one is pretty busy... got a little carried away... Primer white, gloss yellow and Magnum black marker on floor foam pad, about 2' x 2'. Duct tape underneath holding the edge foam down. Took about 3 hours counting letting the paint dry: Masked the white, sprayed it, dried, masked the yellow, sprayed it, dried, then marked out the black edges for contrast and to cover overruns. Bad overruns cleaned up carelfully with acetone, minor ones left.
I like using the foam heli landing pads to keep the tail rotor out of the dirt and grass. I had several and have given them all away. So I am painting up one for myself. I will stake it down, but I have never had one flip up. They take a lot of masking and time but are pretty easy! Yeah, this one is pretty busy... got a little carried away... Primer white, gloss yellow and Magnum black marker on floor foam pad, about 2' x 2'. Duct tape underneath holding the edge foam down. Took about 3 hours counting letting the paint dry: Masked the white, sprayed it, dried, masked the yellow, sprayed it, dried, then marked out the black edges for contrast and to cover overruns. Bad overruns cleaned up carelfully with acetone, minor ones left.
Sunday, July 1, 2012
Going FBL on the HK500!
I decided to mix a few things up. I am getting another Tarot ZYX 3-axis stabilization system, and a Tarot 500 FBL head from cnchelicopter.com for the HK500cmt. I am thinking I will take the BeastX off the EXI 450 and put it on the HK500, and put the Tarot on the EXI. But, really, it may be easier just to put the Tarot on the 500.. it would save me half the work and the Tarot ZYX has been pretty good, other than not being sure about programming the tail limits which wasn't a problem in actual flight. This gives me the HDX500 as a a flybarred heli, and the HK500 as a FBL. Sweet!
EXI 450 Sport to replace the Erazor 450
While the Dynam Erazor 450 has flown well over these past 2 years and has been an integral part of my heli development, her frame is plastic and has several breaks repaired with epoxy and CA, the tail tube is bent ever so slightly and the insertion base for the tail no longer closes over the boom so I won't likely be able to replace it. The tail assembly is worn and battered and held in palce by a set screw that wasn't there in the original design, and I don't like that in the tube with the belt. She is not Align compatible, is getting old and worn, and I have been thinking about a replacement, but don't want to buy an Align. I am determined to stay with Align compatibles so that parts are never an issue, and their quality has been good. I have an EXI 450 Pro, and thought about another, but I didn't like the servo tray, nor do I like having to take the battery base plate out to do anything with the pitch and aileron servos. The Sport has a boom mounted servo holder and the servos for the swash are side mounted and easily accessible. So, today I pulled the trigger on an EXI 450 Sport from Xheli.
My plan is to remove the electronics from the Erazor and use them on the EXI 450 Sport as they are all compatible. The Assan GA250 mems gyro actually performed very nicely today, so I will keep it on this heli until I come across another GP780 or 750 gyro. Its very impressive for a surprisingly low price! I will keep her flybarred as I now have two FBL 450s, the BeastX equipped EXI 450 Pro, and the Frankenheli equipped with the Tarot ZYX FBL system, both of which fly quite nicely.
The Erazor not being Align compatible meant having a separate box of stock replacement parts and I have been loath to stock it. Now I can just keep Align 450 parts in stock and cover all 3!
My plan is to remove the electronics from the Erazor and use them on the EXI 450 Sport as they are all compatible. The Assan GA250 mems gyro actually performed very nicely today, so I will keep it on this heli until I come across another GP780 or 750 gyro. Its very impressive for a surprisingly low price! I will keep her flybarred as I now have two FBL 450s, the BeastX equipped EXI 450 Pro, and the Frankenheli equipped with the Tarot ZYX FBL system, both of which fly quite nicely.
The Erazor not being Align compatible meant having a separate box of stock replacement parts and I have been loath to stock it. Now I can just keep Align 450 parts in stock and cover all 3!
Heli Yeah!
Today I successfully flew my Erazor 450 and the Frankenheli Tarot ZYX in forward flight, doing circles, figure 8s, nose in hover, and did so several times! I also got myself out of a couple hairy orientation losses!
I took the FrankenHeli with the Tarot ZYX system up and she still had the vibration. I decided to take the blades off the Erazor, and put them on the Frankenheli and the wobble tried to emerge, then was gone never to return. The original blades were well balanced, so not sure what's up. I wonder if the CG of the blades don't match?
Dick Ober hovered Franky and told me to crank up the gain. I was flying at 23%. I cranked it up to 35, the 45, and now 55%, and wow, what a difference it made. I had forgotten about starting high and dialing it down. Made a huge difference! I need to take another look at the gain on all of my helis.
All in all, I definitely got my heli on, and it feels awesome
UPDATE: Well...the original blades were slightly off balance... rebalanced them and put
them on the Erazor.
I took the FrankenHeli with the Tarot ZYX system up and she still had the vibration. I decided to take the blades off the Erazor, and put them on the Frankenheli and the wobble tried to emerge, then was gone never to return. The original blades were well balanced, so not sure what's up. I wonder if the CG of the blades don't match?
Dick Ober hovered Franky and told me to crank up the gain. I was flying at 23%. I cranked it up to 35, the 45, and now 55%, and wow, what a difference it made. I had forgotten about starting high and dialing it down. Made a huge difference! I need to take another look at the gain on all of my helis.
All in all, I definitely got my heli on, and it feels awesome
UPDATE: Well...the original blades were slightly off balance... rebalanced them and put
them on the Erazor.
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