WATCH |
1 page 1008 views |
Post Reply |
04-28-2018 12:01 PM 34 months ago
tgalo
rrVeteran USA |
Effects of tight dampening at low head speeds Got a weird violent shake only when spooling down on a 800 size Bell47. I was wondering if I should try softer dampers since it only at 1300 RPM. Smooth and solid except for spool down motor off. Thanks, TGravity's a bitch ant it? |
SHARE PM EMAIL GALLERY Attn:RR Quote |
04-28-2018 01:13 PM 34 months ago
ICUR1-2
rrElite Veteran Ottawa, Ontario |
If it wobbles in flight at low HS then I would go with softer dampners. If it's only on spool down tighten up your blades and see if it's better.spending time, paying attention |
SHARE PM EMAIL GALLERY Attn:RR Quote |
04-29-2018 02:52 AM 34 months ago
Chris Bergen
rrElite Veteran cassopolis, MI USA |
How much negative pitch are you using? I agree with trying changing your blade tightness, but keeping you pitch near 0 or slightly below, vs a full -8 to -10 on spool down may help as well.Chris D. Bergen |
SHARE PM EMAIL GALLERY Attn:RR Quote |
04-29-2018 12:19 PM 34 months ago
tgalo
rrVeteran USA |
I didn't mention that it did have a aileron wobble at 1200 rpm. went away at 1300. Flew fine at that speed till I landed and the spool down shake came. I personally thought the blades were pretty tight but maybe I'll try a bit tighter. Since this was a test I only had about 1 degree of negative. I ordered some softer dampers and will retest. Thanks, TGravity's a bitch ant it? |
SHARE PM EMAIL GALLERY Attn:RR Quote |
04-29-2018 07:24 PM 34 months ago
04-30-2018 01:14 AM 34 months ago
ICUR1-2
rrElite Veteran Ottawa, Ontario |
dgoss999 Why tighter?? DG. if the blades were too loose, because the drivetrain would act as a braking force on spool down the blade tips would advance throwing off the balance.spending time, paying attention |
SHARE PM EMAIL GALLERY Attn:RR Quote |
04-30-2018 07:31 AM 34 months ago
dgoss999
rrApprentice UK - Lancashire |
Don't you have an auto rotation hub between your drive train and main rotor? Besides, I am not thinking the blades so loose they fold back when you power up!! If the blades are dynamically balanced as the should be, they should not shift in the blade holders other than for some lead lag movement in flight.. DG.https://www.facebook.com/scale.skids.52 |
SHARE PM EMAIL HOMEPAGE GALLERY Attn:RR Quote |
04-30-2018 11:48 AM 34 months ago
steph
rrKey Veteran Hampshire England |
If one of the blades is tighter than the other it can on spool up or spool down cause this wobble you are gettingThe world is round you can run but you will always end up where you started from |
SHARE PM EMAIL GALLERY Attn:RR Quote |
05-01-2018 12:30 AM 34 months ago
ICUR1-2
rrElite Veteran Ottawa, Ontario |
You're right the one way should allow the head to free spin spending time, paying attention |
SHARE PM EMAIL GALLERY Attn:RR Quote |
05-01-2018 03:15 AM 34 months ago
Chris Bergen
rrElite Veteran cassopolis, MI USA |
Agreed, as long as you're not pulling mass negative pitch. Which the OP has clarified he is NOT doing, so carry on! Chris D. Bergen |
SHARE PM EMAIL GALLERY Attn:RR Quote |
WATCH |
1 page 1008 views |
Post Reply |
4 Topic Subscribe
Thursday, February 25 - 8:18 am - Copyright © 2000-2021 RunRyder EMAIL • Enable Cookies