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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 (permalink)
johnr3942 Registered Users Join Date: Mar 2009	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 (permalink)
T/CHunter2009 Registered Users Join Date: Feb 2009	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. __________________ TBS Discovery / Nemesis 240 / Park Zone Sport Cub / Taranis X9D / Black Pearl 7' FPV Monitor / iCharger 206-B / Sony 2.8 FPV camera / GoPro Hero 3 Silver +

10-29-2010, 01:03 AM	#5 (permalink)
johnr3942 Registered Users Thread Starter Join Date: Mar 2009	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 (permalink)
scoti333 Registered Users Join Date: Apr 2010	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 -Goblin 630: CC Ice 120HV, vBar

10-29-2010, 07:42 AM	#8 (permalink)
dannylightning Registered Users My HF Map location Join Date: Jun 2010	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.. __________________ ----------------------------------------------------------------- Blade 180 CFX, Sold the rest of my stuff, I dont really fly all that often any more.

10-28-2010, 07:35 PM	#3 (permalink)
ILoveMicroHelis Registered Users Join Date: Dec 2008	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 (permalink)
kouasupra Registered Users Join Date: Aug 2010	Check your feather shaft and main shaft. Even thought it looks straight it might not be.

10-29-2010, 08:55 AM	#9 (permalink)
Larry227 Registered Users My HF Map location Join Date: Jul 2008	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. __________________ Trex 700 Pro DFC - Compass 6HV - Vcontrol - Neo #nodroneshere - 104

10-29-2010, 10:09 AM	#10 (permalink)
dannylightning Registered Users My HF Map location Join Date: Jun 2010	i should mention that my friends 450 does the same thing. he does like tight blades tho.. __________________ ----------------------------------------------------------------- Blade 180 CFX, Sold the rest of my stuff, I dont really fly all that often any more.

10-29-2010, 07:24 PM	#11 (permalink)
ualdrivr Registered Users Join Date: Feb 2008	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! Team GrandRC

10-31-2010, 03:52 AM	#12 (permalink)
johnr3942 Registered Users Thread Starter Join Date: Mar 2009	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

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