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12-12-2019 01:26 AM  44 days ago
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SkySurfer

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usa

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Roban Ec 135
The fennerstron binds up once you apply power. The servo can’t move the pushrod at all. Another guy on another forum had to sell his because he went through 3 fennerstrons, because of the same issue.
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12-12-2019 02:34 PM  44 days ago
Copter Doctor

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

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Ive heard that improvements have been made with new blades and some other bits. Are u using any of them or is yours the original.
I have also seen one fly with the improvements amd from where i was standing it appeared to perform well. Maybe Joel Rosensweig will chime in as it was his i saw fly. Then again Joel can make an oak tree fly well
drive a rotary, fly a rotorcraft
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12-12-2019 08:17 PM  43 days ago
SkySurfer

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I got it to work today. It needed a servo with 320ozin and ballinks were upgraded to 2.5mm hardend bolts. I had one of the factory balls m2 snap from the torque. That fenny has some issues when it’s spun up to speed, very hard to move the bell crank.
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12-12-2019 08:41 PM  43 days ago
Copter Doctor

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Well the reason is simple, they are using radial bearings i stead of thrust bearings. At thise rpm's radial beari gs will bind and lock up. Its not rocket science but the engineers at roban must not realize that. Ive been experimenting with my own design fenny for a few years and ive learned a few things and only limited machinery keep me from a perfect design. Hirobo has had it right for years and vario seems to be cooking with bacon now on their fenny but roban has a lot to learn about heli mechanics design. Im no engineer, but I'm just saying.drive a rotary, fly a rotorcraft
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12-13-2019 12:03 AM  43 days ago
SkySurfer

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usa

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Yeah, I pulled the fenny all apart looking for something wrong. The only thing I could see is no thrust bearings and the geometry of the arms and the size of them are pretty beefy, maybe the centrifugal force keeps them moving freely?. Motion rc says it requires a 67oz servo, but there’s no way in hell that would work

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12-13-2019 07:48 PM  42 days ago
SkySurfer

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usa

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The more I test it and play with it. It’s apparent the stock fenny will never work
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12-16-2019 02:35 AM  40 days ago
Copter Doctor

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Much of that looks similar to vario's. I dont think vario's has thrust bearings either but they may have better quality radial bearings than Robandrive a rotary, fly a rotorcraft
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12-16-2019 04:23 AM  40 days ago
SkySurfer

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I powered up the heli and moved it back and forth in my arms. The tail had no authority to counter the torque. Reason is the servo can’t move the bell crank to the full pitch position. So I can clearly see it will never fly like that. So now we’re in the territory of replacing the Fenny with a Vario for $1000. Or setting it up as a fixed pitch fenny for $300 in parts. I chose the fixed pitch approach.
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12-16-2019 04:29 AM  40 days ago
CoachE

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Cincinnati, ohio -usa

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I have not worked with a Roban yet but if I ever get my hands on one I'll get it to work. You know I love my Fenestrones. I'm ready to get my Bluethunder in the air. Got some theories on the Roban but as I said I will have to see...BD Team Pilot / Get !T - Got !T - Perfect !T
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12-16-2019 04:42 AM  40 days ago
CoachE

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Try reaching out to JestRR He got his flying pretty good. And could save you some coin. I think you should go with a MKS HBL599!

Watch at YouTube

BD Team Pilot / Get !T - Got !T - Perfect !T
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12-16-2019 01:28 PM  40 days ago
Grimracer

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Eau Claire WI

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Yea.. looking at the pictures thats never going to work.. the actuation pins would have to be parallel to the blade pitch rotation or the pins will bind on the movement plates.. I suspect there are plates on each side of the pins.
Grim
Michael J Zaborowski
Futaba USA
AMA 124909
IRCHA 5453
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12-16-2019 01:58 PM  40 days ago
Grimracer

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Eau Claire WI

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This is what I see.. if the pin was a ball this would work fine..or the geometry of the pin was correct in the first place.. (the purple lines should align)

Michael J Zaborowski
Futaba USA
AMA 124909
IRCHA 5453
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12-16-2019 04:54 PM  39 days ago
SkySurfer

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Boy that MKS HBL599 has some serious power. It very well could do it. The problem is I was I was snapping balls off with a 320oz servo. The fennys pitch plate is only treaded into some thin aluminum, very easy to strip. I think it’s a disaster waiting to happen with all that torque and sub par components. You might be able to tread a nut above the pitch plate for more strength. I’ll post photos of my experiment, and I do like to experiment
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12-16-2019 06:49 PM  39 days ago
Grimracer

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Eau Claire WI

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Ya know.. .I think I am wrong on my review of the design... my drawing is wrong..

when the plates are in place how much slop is there between the plates and pins.. have you shimmed it open just a tad to see if it stops binding.. If that frees it up it might just be a clearance issue. I would bet.. that the plates if binding on the rods would cause super high servo loads.

Grim
Michael J Zaborowski
Futaba USA
AMA 124909
IRCHA 5453
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12-16-2019 08:55 PM  39 days ago
SkySurfer

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usa

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I tried a washer in between the pitch plate to open it up a hair. The blades had more play to them and it didn’t make a difference. Still hard as hell to move the bell crank.
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12-16-2019 09:01 PM  39 days ago
SkySurfer

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I just wonder what Motion Rc is going to do selling these kits that don’t work out of the box. There technical support swears it needs a 67 oz servo. They told me to throw out my 320oz servo and go with 67oz servo.
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12-16-2019 10:19 PM  39 days ago
Grimracer

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Eau Claire WI

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does it only load that when it rotating.. what RPM does the fenny run at?

Grim
Michael J Zaborowski
Futaba USA
AMA 124909
IRCHA 5453
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12-17-2019 01:12 AM  39 days ago
Copter Doctor

rrProfessor

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Spinner and Joel R got theirs to work maybe they will chime in with some tips.drive a rotary, fly a rotorcraft
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12-17-2019 01:20 AM  39 days ago
SkySurfer

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usa

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Yes, it only loads when spinning at 15k. My servo can barely move the bell crank. But if I spoil up with the fan at full pitch the servo can hold it just fine. I’m in the process of converting it to a variable speed tail. The pitch on the fenny would always be at 100%. If I could figure out away to bolt it open I would. I’m guessing the fenny will run much slower at 100 % pitch. I should have it done by the end of the week if everything thing works and no unforeseen problems
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12-17-2019 01:48 AM  39 days ago
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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SkySurfer Still hard as hell to move the bell crank.
/
/

If you try to run with three blades, six blades ... To see what is the sloppy mechanism?

You test three blades at a time... There are three combinations... Trying to isolate the sloppy arm and bearing...

You have 9 tiny shaft on a flat disc surface. Just one bend shaft and the whole mechanism is stuck.

/
Saludos cordiales,
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