bad vibration during spool up and down

johnr3942 · 10-28-2010, 03:37 PM

I just built my 500 3g and am experiencing a bad vibration about halfway through spool up and spool down. it only lasts for a second or two and then goes away. it does not vibrate during flight at all. Any suggestions?

T/CHunter2009 · 10-28-2010, 06:29 PM

Check blade tension, if there a bit too tight in the grips then you'll be getting some vibrations until they swing into place . Also re-check blade balance both main blades and tail.

ILoveMicroHelis · 10-28-2010, 07:35 PM

Is it a vibration or a shake?

If it is a shake it is pretty normal, and is often caused by to tight blades. If you tilt your heli to the side the main blades should stay straight but you should be able to "shake" them out of position.

Pete

kouasupra · 10-28-2010, 08:41 PM

Check your feather shaft and main shaft. Even thought it looks straight it might not be.

johnr3942 · 10-29-2010, 01:03 AM

I guess it is more of a shake than a vibration.

scoti333 · 10-29-2010, 03:21 AM

Yea could be main shaft if it's on spool down and spool up... BUT, I recently installed a 3G into my 500 and saw the same thing happening, however a couple of guys at my field said this is fairly normal for a 3G FBL setup? I've just now put a new main shaft on since I bought it used but haven't had the chance to fly it yet

im4711 · 10-29-2010, 06:01 AM

Quote:

Originally Posted by scoti333

Yea could be main shaft if it's on spool down and spool up... BUT, I recently installed a 3G into my 500 and saw the same thing happening, however a couple of guys at my field said this is fairly normal for a 3G FBL setup? I've just now put a new main shaft on since I bought it used but haven't had the chance to fly it yet

Wow -> should not be caused by FBL system. I use MicroBeast and it does not shake during spool up. So blade tension sounds like a possible option as stated by some already. Also make sure you straighten out the blades OK.
If it is the main shaft I believe it might not stop that quick.

dannylightning · 10-29-2010, 07:42 AM

mine shakes a bit when the blades are spinning at low RPM if its not shaking when the blades are at full speed you are probably ok depending on how bad the shake is..

Larry227 · 10-29-2010, 08:55 AM

Mine will shake the odd time halfway during spool down if the collective is in just the right spot. Giving a little collective one way or the other usually smooths it out immediately. It's only happened 5 or 6 times all summer and just once since I went FBL last month.

dannylightning · 10-29-2010, 10:09 AM

i should mention that my friends 450 does the same thing. he does like tight blades tho..

ualdrivr · 10-29-2010, 07:24 PM

IMO, barring any crashes and any bent shafts or other equipment on the heli, the main and/or tail grips are too tight on the blades.

johnr3942 · 10-31-2010, 03:52 AM

Problem fixed, I replaced the mainshaft and loosened the blades and problem went away. Thanks for all your help.

ILoveMicroHelis · 10-31-2010, 04:06 AM

Quote:

Originally Posted by johnr3942

Problem fixed, I replaced the mainshaft and loosened the blades and problem went away. Thanks for all your help.

Was the main shaft bend?

Pete

10-28-2010, 03:37 PM	#1
johnr3942 Registered Users Join Date: Mar 2009 Location: Colorado	bad vibration during spool up and down I just built my 500 3g and am experiencing a bad vibration about halfway through spool up and spool down. it only lasts for a second or two and then goes away. it does not vibrate during flight at all. Any suggestions? __________________ T-Rex 5003g T-Rex 700e 3g

10-28-2010, 06:29 PM	#2
T/CHunter2009 Registered Users Join Date: Feb 2009 Location: Trumansburg New York	Check blade tension, if there a bit too tight in the grips then you'll be getting some vibrations until they swing into place . Also re-check blade balance both main blades and tail. __________________ Blade 130X : Bilnged out with Lynx & Microheli Metal ./ Batteries : Zippy Compact 500mAH / Glacier 450mAh /Eflight 300mAh iCharger 206B, P.S 350 power supply. Spin 8000kv motor.

10-29-2010, 01:03 AM	#5
johnr3942 Registered Users Thread Starter Join Date: Mar 2009 Location: Colorado	I guess it is more of a shake than a vibration. __________________ T-Rex 5003g T-Rex 700e 3g

10-29-2010, 03:21 AM	#6
scoti333 Registered Users Join Date: Apr 2010 Location: austin,TX	Yea could be main shaft if it's on spool down and spool up... BUT, I recently installed a 3G into my 500 and saw the same thing happening, however a couple of guys at my field said this is fairly normal for a 3G FBL setup? I've just now put a new main shaft on since I bought it used but haven't had the chance to fly it yet __________________ -Goblin 700: Crashed but re-building, still needing electronics To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. -Goblin 630: CC Ice 120HV, vBar

10-29-2010, 07:42 AM	#8
dannylightning Registered Users My HF Map location Join Date: Jun 2010 Location: Akron, Ohio	mine shakes a bit when the blades are spinning at low RPM if its not shaking when the blades are at full speed you are probably ok depending on how bad the shake is.. __________________ Flying GAUI & Compass Helicopters, youtube.com/dannylightning facebook.com/dannylightning1313

10-28-2010, 07:35 PM	#3
ILoveMicroHelis Registered Users Join Date: Dec 2008 Location: Scandinavia	Is it a vibration or a shake? If it is a shake it is pretty normal, and is often caused by to tight blades. If you tilt your heli to the side the main blades should stay straight but you should be able to "shake" them out of position. Pete

10-28-2010, 08:41 PM	#4
kouasupra Registered Users Join Date: Aug 2010 Location: Fresno, CA	Check your feather shaft and main shaft. Even thought it looks straight it might not be.

10-29-2010, 08:55 AM	#9
Larry227 Registered Users My HF Map location Join Date: Jul 2008 Location: Creston, BC (Canada) Porthill, Idaho (US)	Mine will shake the odd time halfway during spool down if the collective is in just the right spot. Giving a little collective one way or the other usually smooths it out immediately. It's only happened 5 or 6 times all summer and just once since I went FBL last month. __________________ Compass 6HV - SK540 - MKS HBL665/669 Trex 500 ESP - SK540 - 510's/BLS251 DX8 / Phoenix / Persistence ~"See the heli, fly the heli"~

10-29-2010, 10:09 AM	#10
dannylightning Registered Users My HF Map location Join Date: Jun 2010 Location: Akron, Ohio	i should mention that my friends 450 does the same thing. he does like tight blades tho.. __________________ Flying GAUI & Compass Helicopters, youtube.com/dannylightning facebook.com/dannylightning1313

10-29-2010, 07:24 PM	#11
ualdrivr Registered Users Join Date: Feb 2008 Location: NY	IMO, barring any crashes and any bent shafts or other equipment on the heli, the main and/or tail grips are too tight on the blades. __________________ At the precipice, we change! To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. Team GrandRC

10-31-2010, 03:52 AM	#12
johnr3942 Registered Users Thread Starter Join Date: Mar 2009 Location: Colorado	Problem fixed, I replaced the mainshaft and loosened the blades and problem went away. Thanks for all your help. __________________ T-Rex 5003g T-Rex 700e 3g

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode