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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › Roban 700 AS350 Mechanics Vibration Fix's
05-27-2016 10:33 PM  3 years ago
TailKiller

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Panama City, FL

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Thanks for the reality check Barry. I know this and keep forgetting about it.. I'll check it in setup.Dennis
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05-28-2016 12:47 AM  3 years ago
Mojave

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Palos Verdes, Ca. USA

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No worries bud I'd just hate to see you chase a gremlin that might not exist... If you set everything back to level and the heli flies erratically, then you have a problem to chase down.
Barry
All helis and planes have an expiration date stamped on them...you only find it after you crash!!
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05-30-2016 04:27 AM  3 years ago
TailKiller

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Panama City, FL

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Well, well.. I really do like this Century head. Its simple and very smooth. The follower I made will bottom out at +13 degrees but I will never see that cuase I'm setting for +11 max.

The one thing I don't like about the head is the size of the ball on the blade grip ball pin. It's like 4.75. If it was 5.0 I could use larger ball links and 2.5mm turnbuckle rods. But I will be using 2.0mm titanium turnbuckle rods with 4.75 ball links.

I tried to find different blade grip ball pins with 5.0mm but could not find any, which is strange cause my Align 3G head on my Jet Ranger has the right size ball and pin length.

Until the turnbuckles get here I was able to make one swash to grip linkage using 600 size link and ball links. I had to change out the balls on the swash to the next size down.
So anyway. I was figuring out rod lengths and looking at wether mechanically or electronically phase the head. I set the one grip using both methods.
I'm not to comfy with the electronic phasing. The swash movements are very strange and just not what I'm use to. So mechanical is the way I will set the phasing. It means that the swash to grip linkages will be at a 45 degree advanced angle but it must work fine, I see a lot of heads with the same angles.

It will be a few days before I get my linkage rods so I guess i'll have to do productive things around the house. Bummer! lol
Dennis
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05-30-2016 06:41 AM  3 years ago
Copter Doctor

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Enterprise/ft.rucker ,al- home of army aviation

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cool deal Dennis, glad your head came in. don't let the roban size ball links spoil you, the size used on the century heads are plenty enough to do the job. the angled rods as a result of phasing is nothing to worry about, it will work fine. You could arrange to phase it at the swash but that gets a little involved reassigning the roll and elev servo as well as adjusting the antirotation link but it would mean straight up vertical pushrods from the swash to the head. I never could find which rods I used for my century head but it seems you may already have that covered. keep us posteddrive a rotary, fly a rotorcraft
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05-30-2016 12:56 PM  3 years ago
TailKiller

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Panama City, FL

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The push rod / turnbuckle lengths that I ordered are 44mm or about 1"3/4 long 2mm thread.
http://www.davincimachining.com/ind...4&category_id=4

Lunsford Racing has nice 3.0mm links. They are made for rc trucks and crawlers but now works with helis..lol on my JR with 700 size ball links.
http://www.lunsfordracing.com/mm5/m...tegory_Code=3SL

These things make for sweet fine tuning.
Dennis
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05-30-2016 07:57 PM  3 years ago
Copter Doctor

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I picked up some car pushrod turnbuckles a few weeks ago but I haven't used them yetdrive a rotary, fly a rotorcraft
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06-05-2016 10:23 PM  3 years ago
TailKiller

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Panama City, FL

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I'm happy as a pig in slop!! So I got the linls I ordered for the century head. Worked out the geometry of the head, did a complete new setup, got my pitch curve worked out. Then it was time to track the blades.

So I strapped it down and spun it up. Right out of the gate it was spot on. I didn't need to adjust a single link. There's a distinct sound that the rotors make while transitioning through 0 pitch. From about -1.5 to +1.5.
The better the tracking the crisper the sound effect.
Some would say you can not do this with a FBL unit or so I have been told.
Well have a look and hear for yourself. You can hear it transition as I work the collective.

Watch at YouTube

Dennis
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06-05-2016 10:52 PM  3 years ago
Whopper Chopper

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Atlanta, GA

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Thats great progress. Unfortunately, I have to get rid of mine.
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06-05-2016 11:00 PM  3 years ago
Copter Doctor

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Nice work Dennis! yeah the sound changes when you go from negative to positive, as the air starts to get beaten into submission, the sound changes and its a cool sound too. I have been working on scale details on mine the past few days and perfect since its been raining. I think I have the shakes figured out on Roy;s 429 mechs, the rotor head may have been the culprit all this time with a slight difference in the length of one of the feathering spindles. a newer roban head has reduced it quite a bit. the bearings by the way were not the issue as I did that first and the shake was still there. anyway onward we go.drive a rotary, fly a rotorcraft
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06-05-2016 11:28 PM  3 years ago
TailKiller

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Panama City, FL

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Yeah.. the first thing I wanted to check on my roban head was the feathering shaft placement cause the grips were not tight, but I could not cause the screws on the head that lock down the shafts were very weak and every one of them striped out.. Another great roban feature. Like I said.. mine was made on a hangover Monday.Dennis
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06-06-2016 01:19 AM  3 years ago
Mojave

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Palos Verdes, Ca. USA

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Agreed Emile, all it takes is .010-.020" difference in feathering shaft length to cause a vibe. Glad you chased that Gremlin down...
Barry
All helis and planes have an expiration date stamped on them...you only find it after you crash!!
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06-06-2016 01:20 AM  3 years ago
Copter Doctor

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yeah mine too, I had to drill every single one out to take the head apart when i checked it the first time and replaced them with better bolts when I reassembled it. Monday is correct lol!drive a rotary, fly a rotorcraft
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06-12-2016 02:31 AM  3 years ago
TailKiller

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Panama City, FL

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I've been very busy lately and just got the chance to test fly the mechs with the new Century head and setup. What a huge difference!! It performed flawlessly. I couldn't have asked for better.
It came off the ground level with no cyclic input an hovered spot on.
Forward flight was smooth and only needed very little collective management to maintain altitude. It all most flys itself.

I put on new servo horns that would let me put the balls way in to the center. to lessen the travel. I also brought the servo travel down to 60% and to top that off I setup for only 5.0 degrees of cyclic pitch instead of the 6.5 the fbl unit wanted.
I didn't know how all these changes would turn out and I was very puckered up when it lifted off the ground but all is well.
I really needed this positive.. I have had nothing but negatives with this build.
So I'm going to do a half dozen shake down flights and make sure all is good. The fuse is ready for it's power train. I still need to paint the main blades but I can do that any time.
Dennis
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06-12-2016 03:50 AM  3 years ago
old nitroman

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Naples florida

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Congrats great to hearE5s and E7se,and a 766, Roban bell 222 800 superscale,450 bell 4 bladed head,gobby 380and 420 ,180cfx
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06-14-2016 05:35 AM  3 years ago
TailKiller

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Panama City, FL

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Well.. sorry to say that my home made swash follower did not hold up to the stress. I noticed today that my phasing was out... I had movement where there shouldn't be any. The follower radius arm was flexing at the joint and was twisting the swash.
Oh well, I tried. Sucked it up and ordered the Century follower.
Dennis
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06-29-2016 12:12 AM  3 years ago
TailKiller

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Panama City, FL

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Hey guys. I've had a set back.. My motor is toast. The bearings fell apart and the outer races are fused to the housing from super heating.
So if anyone has a good motor with long shaft, 500 to 530kv, 6mm shaft they want to sell. My motor was a Scorpion HKiii 4035 530kv. Let me know. Thanks.
Dennis
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07-19-2016 02:07 AM  3 years ago
TailKiller

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Panama City, FL

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LOOK UP IN THE SKY IT'S AN A-STAR FLYING
Ya buddy... it flies. Head speed was to low but nothing a couple of key strokes can't fix. I thought that the weight would be close to the same as the testing weight with the home made gear but it is most definitely heavier. Have a few other little things to work on, but it's all good. I'm as happy as a pig in ____!!!!!

Dennis
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07-19-2016 03:32 PM  3 years ago
Copter Doctor

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Enterprise/ft.rucker ,al- home of army aviation

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Awsome! looking great in the air Dennis! drive a rotary, fly a rotorcraft
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07-20-2016 12:59 AM  3 years ago
TailKiller

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Panama City, FL

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Going to do some more RPM testing tmr. I had to give a lot of collective to hover. I think it was around +8 degrees @ 1300 rpm. That is cause I record the pitch degrees at collective stick hash marks. I will also need to pull the mechs next week and open up the exhaust port and add a fan to cool things down a little and get some air flow. It's never ending. Dennis
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07-20-2016 02:35 PM  3 years ago
getsuyoubi

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Queens, NY - USA

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Which swash are you guys using with the Century head? The Century swash at Heli-World seems to be a 90 degree servo arrangement, not 120.
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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › Roban 700 AS350 Mechanics Vibration Fix's
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