BettyFord Posted October 21, 2018 Report Posted October 21, 2018 Hi my nosewheel is fluttering heavily on grass. Shockdisk has been replaced a year ago. Any other reason fort he flutter? Thanks Quote
Mjknick@gmail.com Posted October 21, 2018 Report Posted October 21, 2018 Steering horn gets worn. Lasar has rebuild and conversion from early to late. Save your $$$$ not cheap but it fixed my shimmy to zero. Sent from my iPhone using Tapatalk 1 Quote
rbridges Posted October 21, 2018 Report Posted October 21, 2018 I was going to suggest steering horn, also. Several threads about it since it's a pretty common part to wear over the years. If you knew what "normal'" felt like, you can grab your rudder and see how much play is in it on the ground. Mine really tightened up when the steering horn was replaced. Quote
Guest Posted October 21, 2018 Report Posted October 21, 2018 On 10/21/2018 at 8:28 AM, BettyFord said: Hi my nosewheel is fluttering heavily on grass. Shockdisk has been replaced a year ago. Any other reason fort he flutter? Thanks Expand While SB M20-202 does not apply to your serial number, the concept does and is in the maintenance manual. https://cdn2.hubspot.net/hubfs/4147179/technical_documents/service_bulletins/sbm20-202.pdf?t=1524682187863 Clarence Quote
N201MKTurbo Posted October 21, 2018 Report Posted October 21, 2018 You should also look at the pivot bushing on the trunion. Check it for play while up on jacks. If it is worn you can replace the bolt and bushing. If it warn between the bushing and trunion, Laser has oversized bushings. The nose gear steering should be stable irregardless of how much slop is in the steering horn. A tight steering horn can keep a sloppy steering pivot from shimmying, which is just masking the real problem. 2 Quote
rbridges Posted October 21, 2018 Report Posted October 21, 2018 On 10/21/2018 at 12:40 PM, N201MKTurbo said: You should also look at the pivot bushing on the trunion. Check it for play while up on jacks. If it is worn you can replace the bolt and bushing. If it warn between the bushing and trunion, Laser has oversized bushings. The nose gear steering should be stable irregardless of how much slop is in the steering horn. A tight steering horn can keep a sloppy steering pivot from shimmying, which is just masking the real problem. Expand I think that got replaced at my last annual. Cole ordered a bushing from LASAR because it was worn. 1 Quote
carusoam Posted October 21, 2018 Report Posted October 21, 2018 Aside from all good advice you have gotten so far... For additional background there is a maintenance piece written by DMax called the eight second ride... it details the wear issues described in this thread. The title is a reference to riding a bull... How well is your 2200’ grass strip working out? Best regards, -a- 1 Quote
BettyFord Posted October 21, 2018 Author Report Posted October 21, 2018 Thanks, next month is the annual...let's see what the maintenance guys say. The grass strip works out fine so far......the surface is smooth and with a weight in the midrange you never need more than half the rwy. On takeoffs almost fully loaded with light winds and not too hot no problems as well. Only taxiing to the hangar the ride gets rough and the nosewheel starts to flutters. So the M20J is a perfect plane to fly on grass and not like some say not usable, provided you fly the correct speed! I even went to Helgoland (EDXH 480m or 1574ft) Great fun so far with my plane 1 Quote
Shadrach Posted October 21, 2018 Report Posted October 21, 2018 I have a new steering horn and and installed the LASAR oversized truss bushing. My linkages are tight but my nose wheel still shimmies noticeably when tire pressure is below spec. The further below spec, the more shimmy. I'd start there first. Eyeballing the tires on these aircraft is not an adequate means of determining proper pressure, especially on grass. I agree with you regarding the airframe working well on short and soft fields. The inner gear doors are vulnerable, but the airframe is perfectly capable in the hands of a speed conscious pilot. Quote
INA201 Posted October 21, 2018 Report Posted October 21, 2018 On 10/21/2018 at 12:47 PM, rbridges said: I think that got replaced at my last annual. Cole ordered a bushing from LASAR because it was worn. Expand Ditto, Cole took care of the bushing which fixed my shimmy. Quote
Alan Fox Posted October 21, 2018 Report Posted October 21, 2018 As all the experts have spoken , Lasar makes a shim that goes on top of the truss over the tube under the collar , it is 45 dollars , and will stop all shimmying.....But by all means spend 2000 dollars trying to do what everybody says , 2 1 Quote
Yetti Posted October 22, 2018 Report Posted October 22, 2018 Also holding back on the yoke will help. Which should probably be done on grass anyways. Quote
RobertGary1 Posted October 22, 2018 Report Posted October 22, 2018 On 10/21/2018 at 2:12 PM, BettyFord said: . So the M20J is a perfect plane to fly on grass and not like some say not usable, provided you fly the correct speed! Expand M20s do fine on some grass fields as long as the gopher holes are smaller than the nose wheel. -Robert 1 Quote
ujhan Posted November 8, 2018 Report Posted November 8, 2018 On 10/21/2018 at 9:14 PM, Alan Fox said: As all the experts have spoken , Lasar makes a shim that goes on top of the truss over the tube under the collar , it is 45 dollars , and will stop all shimmying.....But by all means spend 2000 dollars trying to do what everybody says , Expand @Alan Fox can you post the link here to that shim please? Quote
Guest Posted November 8, 2018 Report Posted November 8, 2018 On 11/8/2018 at 3:47 AM, ujhan said: @Alan Fox can you post the link here to that shim please? Expand Here you go, https://cdn2.hubspot.net/hubfs/4147179/technical_documents/service_bulletins/sbm20-202.pdf?t=1541526534194 Clarence Quote
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