mnemennth
Posts: 96
Score: 100 Joined: 7/30/2012 Last Login: 5/21/2013 From: San Antonio, TX, USA Status: offline
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Well... time for an update on the Hausler. I meant to do this several days ago; but truth be told, this week has been like going to war EVERY FREAKING DAY. I think I've been suffering a little PTSD, actually. [ ]
So... we worked on RF; got it updated to 6.5. It's working great on my PC. Pleased purple with pink polka dots over that but... haven't had a chance to use it because I've been busy working with Brook (That's the fellow RC clubber's name) trying to rebuild Giselle (That's the helicopter's name) since Sunday...
Okay. (Video Rewind-ey noises) When I made the swap, I included one of the Hausler 450 spare chassis that I bought when they had them on sale; it came with complete CNC Head & Tail upgrade. Saturday morning I get a text from Brook; the air is dead calm and he's going to Olmos Park and fly a few packs. Good for him. That night, I get a call...
He tells me he went flying; had 3 great flights, then came home. "Should have just gone inside and played on the Sim, but I figured 'Hey it's still light out; I'll just practice a little hovering in the front yard.'"
Brook's front yard is just like mine; 40 x 40 ft, marked at each corner by kite-eating trees. I KNOW where this is going.
"I was doing great, but then it started to drift, so I went to cut throttle and hit the other switch by accident."
I have almost done this myself many times but stopped myself just in time. My Turnigy TX has the TH HOLD on the left; this one has it on the right. I'm told this is the way most TX have it, so I've tried to get used to that config. You KNOW what the OTHER switch does.
"It just sortof rolled over on it's side a couple feet off the ground like a dog asking for a belly rub... then came the crashing and grinding noises... it was like I was watching in slow motion."
Yeah; adrenaline will do that." I said; already knowing in my mind what that poor heli looked like. [ ]
"So... can I come over with those parts you gave me... and we can try and put it all back together."
"Yeah, sure. Beth'll be home, so we can work without the kids up in our faces."
As I hang up the phone, I'm already putting together a list of things he DOESN'T have that he's gonna need. No problem; I have a BIG box of spares. I'm just down to my last set of new blades & they're on my HK450GT, so I dig out a few that were "a bit too long, so I trimmed 'em on the ashphalt" from the bottom of my "Last ditch spares" box. No problem.
He shows up next morning; my worst fears were made real. It's a TOTAL disaster; In 2 years of crashing, I've only had one this bad. On the first flight. With my 450GT. Full headspeed, blade strike on the ground, then blade-wrap on the tail. That was the one where half a blade stuck in the ground at my feet. He even shattered the plastic head; in all the flights and all the crashes, all the times I had to straighten the feathering shaft on that Hausler 450's head... I NEVER actually BROKE it.
"This is about a 2.5 on the Henderson Scale." * I tell him. "It looks like the only thing that survived intact was the chassis and electronics. It would ALMOST be easier to build a new one." Little did I know how much I would wish we had done just that...
Everything that moves is bent or broken except 1 cyclic servo; bent mainshaft, tailboom, tailrotor. The Flybar looks like a spaghetti. Broken main blade, gear, flybar seesaw, washout links, even the 1-piece resin skids I thought were unbreakable.
So... I show him what has to be removed so he can strip it down to the chassis; I'm still telling myself it'll be easier than mounting all the electronics on the new chassis, and he needs the experience anyways. "Besides... I'm not ready to bury Giselle yet... I like that name." he says in a deliberately childlike whiney voice.
I explain to him that this is going to be an all day job; we have to rebuild EVERYTHING. This means disassembling every screw that goes into metal and making sure it's LockTited, all rotating masses have to be trued and balanced. When that's all done, we have to zero the servos, level the swash and set up a new head. If we're lucky, we MAY get to that part.
We got close on Sunday. You know how it is when you're building with friends; you spend as much time ratchet-jawing as you do working. Brook has more piloting skill than I do; lots more on planks, a fair amount with an mCPX. But not nearly as much technical/mechanical experience. This is his first 450-size "real" heli, but between his other experience and LOTS of Sim time, he flies any of my birds better than I can.
Delays with setting up the tail and having to try 3 main gears to get one that ran true... pretty much every single little time-wastey thing that could go wrong with a new build tried its best on us. At the end of the day, we had a complete chassis, all LockTited; new CNC tail assembled and swash leveled and new CNC head assembled but not installed. We got to hear it run and test gyro action on the tail. I called it a good day.
The next day was only a few hours due to work for me and Dr.'s appts for Brook; we completed the head, squared & centered the Flybar, set zero pitch and balanced the best-matched of my "trimmed blades" then went about trying to set tracking. This was where we ran into our fundamental problem: a really nasty shudder just off idle; like when the blades are straightening themselves but still persisting afterwards. If it wasn't clamped to the bench it would make the heli want to flop over even after it had a chance to spin up. Once it got above 1/4 throttle, it got out of the resonant frequency and would spin up okay; still a little vibration, but I've flown all of mine with worse. It was late; we decided to "tackle it tomorrow".
The next day was a blur; tearing the head down , tearing the gearset down, measuring runout on the mainshaft with a dial indicator (it had less that .001"), rebuilding and retesting. Eventually I tried the head and blades off my HK450GT; that cured EVERYTHING. Not as smooth as the HK450GT, but as smooth as the Hausler had ever been; and that was with a maingear that still needed to be broken in.
o.0
That evening and most of the next day was spent trying parts from my new parts box and used parts bin to try and make the Hausler 450 behave like it did with the HK450GT head on it; eventually, it was nearing time for our flying club meet, so I made an executive decision: we were going to put my HK450GT back together so he could have SOMETHING to fly. That was when we got the the icing on the annoyance cake. My HK450GT now had a slight vibration; not bad, certainly flyable. But it wasn't there before.
grrr.
We packed it all up and went flying; of course, that night's game ran over and we had to wait to get into the gym. I spent most of the meet just shooting the breeze and relaxing; burned a few packs in my quad and tried to troubleshoot some video glitching on my "cheap-ass keychain cam". Afterwards, I took my heli home and Brook went home; we both have work-related stuff, so no more working on it this week. But just now, I got a text from him; he wants to come over Monday.
Pray for me.
mnem *Goes back to the relative sanity of being a soccer-mom with 2 small children*
* The Henderson Scale ends at 2 Full Hendersons: The action taken by the player has decimated the plot and Universe of the game so utterly that the game has to be scrapped, RetConned, posted about on /tg/, and the GM has to begin an entirely new game.
See: http://1d4chan.org/wiki/The_Henderson_Scale_of_Plot_Derailment Also: http://1d4chan.org/wiki/Old_Man_Henderson
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*DH9118/HK450GTV2/Hausler450V2/EXI450Pro/HDX450/S107G/V911/GeniusCP/TGY-9X/DEVO-7*
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