RunRyder RC
 14  Topic Subscribe
WATCH
 2 pages [ <<    <     1     ( 2 )    >    >> ] 2400 views
HelicopterMiniature Aircraft Whiplash & Fury 55 › Source of high frequency Vibration
12-03-2005 01:50 PM  12 years agoPost 21
Bert Kammerer

rrVeteran

Orlando, Florida

My Posts: All  Forum  Topic

I have a little story to share. I had also a high frequency vibration on my Stratus (there is a thread somewhere here about this titled "Tail Drift"). I checked everything from engine fan static balance, runout, re-dialed it back in, pulled main shaft, hub, etc. to manually check/inspect bearings. I spent hours trying to find the cause and never found it! I then changed fuels (I had been flying a different brand of fuel for a few gallons) and when I went back to the original fuel I run (Coolpower) the high frequency vibe went away completely!

My engine was over compressing and pre detonating with the other fuel. It was running rough apparently for some reason with that fuel. Even though I think I could have fixed the issue by shimming the ViperHead differently, I opted to go back to Coolpower.

I am not saying that this is what is happening to any of you, but something to keep in mind. 99% of all these issues are engine related. I have seen fans that can be dialed in to less than 1 thou and yet mounted on bent crank shafts.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
12-12-2005 12:38 PM  12 years agoPost 22
I3DM

rrProfessor

Israel

My Posts: All  Forum  Topic

OK guys, the engine has a new crank and now an overall of 024 shimming in the Viperhead (018 before) - and just got the OMI carb as well, so should be able to test it this weekend.

hopeing for the best..

www.liorzahavi.com

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
12-13-2005 11:18 PM  12 years agoPost 23
rada70

rrKey Veteran

Westchester, NY

My Posts: All  Forum  Topic

OK, keep us posted. I'm very intersted on finding out how it turns out.

Just do it.

PM  EMAIL  GALLERY  Attn:RR  Quote
12-19-2005 06:56 PM  11 years agoPost 24
Fredrik R

rrApprentice

Habo, Sweden

My Posts: All  Forum  Topic

Lior, any news on the subject?


Fredrik

PM  EMAIL  GALLERY  Attn:RR  Quote
02-11-2006 11:17 PM  11 years agoPost 25
Jambo

rrApprentice

Kent, UK

My Posts: All  Forum  Topic

I3DM - well have you fixed the vibes, if so what did you find ?

PM  EMAIL  GALLERY  Attn:RR  Quote
02-12-2006 11:21 AM  11 years agoPost 26
I3DM

rrProfessor

Israel

My Posts: All  Forum  Topic

after changing the crank shaft the situation is better no doubt, but i still get a little skid shake at idle that im not sure about the source.

www.liorzahavi.com

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
02-12-2006 11:43 AM  11 years agoPost 27
nivlek

rrProfessor

Norfolk England

My Posts: All  Forum  Topic

Crankshaft balance is a compromise , it can only be perfect at one fixed rpm , so maybe that's all it is .

At the end of the day , it gets dark .

PM  EMAIL  Attn:RR  Quote
02-12-2006 12:08 PM  11 years agoPost 28
I3DM

rrProfessor

Israel

My Posts: All  Forum  Topic

Nope, that isnt it. none of my other machines do it.

www.liorzahavi.com

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
02-12-2006 12:30 PM  11 years agoPost 29
u.k. sailor

rrVeteran

cambs uk

My Posts: All  Forum  Topic

out of interest did you dial the fan after the shaft change and if you did how good was it, i ask because i am trying to see how much difference it makes. like yourself i have not done this in the past but i am trying to now, but not sure how much visible any difference it is. I know Dr Ben said the electronics etc can feel vibration we perhaps can't see, and that makes a lot of sense.

PM  EMAIL  Attn:RR  Quote
WATCH
 2 pages [ <<    <     1     ( 2 )    >    >> ] 2400 views
HelicopterMiniature Aircraft Whiplash & Fury 55 › Source of high frequency Vibration
 Print TOPIC  Make Suggestion 

 14  Topic Subscribe

Monday, December 11 - 11:04 pm - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online