RunRyder RC
WATCH
 1 page 765 views POST REPLY
HomeAircraftHelicopterJR Heli Vibe 90/50, Sylphide 90, GSR260 › Vibe SG elevator arm
04-27-2009 02:32 AM  9 years agoPost 1
Gary Lkn

rrNovice

northeast

My Posts: All  Forum  Topic

Guys , just want to to make everyone aware of a potential issue . At the end of an impressive maiden flight decided to hover out the rest of the tank . Gave collective and the heli rose and went full back elevator ... pushing forward did little and a quick throttle hold and aileron put her down , but not without damage . The issue is with the way the elevator arm secures . There are no flat spots on that part of the splindle and use two flat bottom set screws to secure it . One of my set screws just slightly loosened , the other was locked against the spindle and it was still enough for the servo to rotate the arm and not move the A arm resulting in the pitch and aileron servos to tilt the swash full back which is what happened . On the bench we clearly could see the one set screw seated on the rod and the second barley backed off . There is a lot of force on cyclic and this is not a solid connection from arm to swash . They put flat spots on the splindle for the base , why not incorporate in the CNC process to have flat spots for the arm that would make everything at 90 degrees and a solid connect with no way of slipping . Blades ... mains and tails , canopy and left tail case took most of the damage , could have been worse . Make sure too really crank down on those set screws , would hate to see another due to this . Hopefully JR or someone will make upgrade with flat spots for arm . Im looking into pointed set screws which will at least dig into the shaft to hold it better .

PM  EMAIL  Attn:RR  Quote
04-27-2009 11:56 AM  9 years agoPost 2
kris L

rrApprentice

NY

My Posts: All  Forum  Topic

Sorry to read about your incident! I'll check my set screws right away.

- Chris

PM  EMAIL  GALLERY  Attn:RR  Quote
04-27-2009 06:06 PM  9 years agoPost 3
ScottyGray

rrNovice

Waterloo, Ontario Canada

My Posts: All  Forum  Topic

V90SG elevator arm securement
Hi GMJC,

Thanks for your email. The Vibe series and, actually all other JR CCPM helis use this same technique for fastening the elevator arm to the bell crank.

The reason flats are not machined, but only a turned recess is on the shaft, is so that the pilot can setup the swash plate as they choose. Yes, most will setup so that 0deg/50%stick/90degree links, but for some F3C, and other uses there are times where you do not want this pre-determined locating for the setscrews.

The supplied set screws are of the "cup" point type. Do not substitute for point type as they will have less surface area clamping on the shaft. Simply tighten well and use blue/medium loctite. I tighten snug with allen hand wrench first when setting up, then fully tighten with a tug on an allen key. After these are tight, snug up the M4 nut on the shaft to fully secure everything. It will not move after this. When tightened enough, the set screw cup will dig into the steel shaft and hold quite well. It will leave a witness mark where it has been tightened.

In fact, when I disassemble this component, and reassemble, I can find the recesses that the setscrews created before and not have to re-check my setup and servo centering on the elevator.

Sorry about the difficulty you had here, however I'm certain once tightened well it will not be an issue. Happy flying!

Scott Gray
http://www.scottgrayrc.com

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
04-28-2009 12:18 AM  9 years agoPost 4
Gary Lkn

rrNovice

northeast

My Posts: All  Forum  Topic

Thanks for replying so fast Scott . Its an honor to get feedback from the person who designed and developed the heli . From the moment I set eyes on this beauty I had to have one . JR stands for quality and it shows in there products . Its also why I choose the 12X as my radio . I will ensure to follow your advise of not changing the set screws and to secure them in the way you described . I think the one thing that made me feel bad about the crash was when the new set of your rotortech 710 SG blades I just put on met the ground . Those are sweet blades . Thank you again Scott for the advise .

Gary

PM  EMAIL  Attn:RR  Quote
04-28-2009 06:25 AM  9 years agoPost 5
MANCHA

rrVeteran

Cabo San Lucas, Baja- Mexico

My Posts: All  Forum  Topic

Do not feel bad Gary Lkn, bellcranks ( servo arms ) are srew down the same way in the old vibe 90, switching by mistake those cup point screws for flats was and is a common cause of crashing.

It will not happen to you ever again !,

get it back on flying status asap, you are missing a lot !!

MANCHA

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 765 views POST REPLY
HomeAircraftHelicopterJR Heli Vibe 90/50, Sylphide 90, GSR260 › Vibe SG elevator arm
 Print TOPIC  Make Suggestion 

 3  Topic Subscribe

Sunday, October 21 - 10:34 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

The RC discussion world needs to consolidate. RR is now one choice for that. Its software is cutting edge. It hosts on-topic advertising. Help RR increase traffic buy making suggestions, posting in RR's new areas (sites) and by spreading the word.

The RunRyder Difference

• Category system to allow Rep/Vendor postings.
• Classifieds with sold (hidden) category.
• Classifieds with separate view new.
• Answer PMs offsite via email reply.
• Member gallery photos with advanced scripting.
• Gallery photo viewer integrated into postings.
• Highly refined search with advanced back end.
• Hosts its own high end fast response servers.
• Hosts thousands of HD event coverage videos.
• Rewrote entire code base with latest technology.
• No off-topic (annoying) click bait advertising.
Login Here
 New Subscriptions 
 Buddies Online