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Nose tire pressure and shimmy.

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05 Aug 2021 18:44 #1 by John Farrell
Replied by John Farrell on topic Nose tire pressure and shimmy.
Yeah, Cessna 150's were/are notorious for nose wheel shimmy. Probably caused by new pilots landing too fast, like I was prone to do 43 years ago. . .and still do occasionally! Flew today after letting air out of the nose tire to 20lbs. No shimmy. Maybe winds helped slow my ground speed; variable at 8 knots.

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03 Aug 2021 22:37 #2 by Chris Goes Flying
Replied by Chris Goes Flying on topic Nose tire pressure and shimmy.
Happened to me once. I didn't change the tire pressure, did anything different during my landing or anything. Had 20+ landings prior to that shimmy and then, one night, there was that shimmy. My mechanic looked everything over and found nothing. After that shimmy landing, I did another, I don't know, 20+ landings with no shimmy.

Funnily enough, when I rent a Cessna 150 occasionally, it pretty much get a shimmy every single landing unless I make it a soft field landing and keep the elevators up until I almost get to a stop.

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29 Jul 2021 16:38 #3 by John Farrell
Replied by John Farrell on topic Nose tire pressure and shimmy.
Thanks for that info, Michael. My coupe goes in for its annual next month will make sure to check those AN bolts on the nutcracker assembly! I too try to find that "sweet spot" with the elevator if the shimmy happens.

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29 Jul 2021 16:08 - 30 Jul 2021 10:40 #4 by Michael Hainen
Replied by Michael Hainen on topic Nose tire pressure and shimmy.
If you look in the operating book and also on the nose wheel rim the tire pressure is 17lbs. I put a new nose wheel on and the correct tire pressure and things got better. My IA also suggested putting 2 new AN bolts in the the upper and lower ends of the nose wheel nutcracker assembly, it seems they can wear and wallow out the holes or the shanks of the bolts. Haven't done yet, just got back from EOC convention in Wausau, a really good time and OSHKOSH too, Bugged out when they predicted bad storms. As for the shimmy when it happens I move the elevator control yoke back and forth and find a happy spot.
Last edit: 30 Jul 2021 10:40 by Michael Hainen. Reason: spelling
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24 Jul 2021 15:01 #5 by Larry Snyder
Replied by Larry Snyder on topic Nose tire pressure and shimmy.
Holy cow! I run 18 pounds in my nosewheel and 20 in the mains. That must feel like landing on rocks! Let some air out! Mine shimmies above 18.
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24 Jul 2021 14:49 #6 by John Farrell
Nose tire pressure and shimmy. was created by John Farrell
After 16 hours and 25 or so landings in my '48 Ercoupe 415E with C-85 engine I've noticed a difference after touchdown (around 65-70mph) maybe a little slower depending on wind, there is rarely a nose wheel shimmy while slowing down before exiting the active.  Several weeks ago my mechanic put 40psi in the nose tire.  I questioned him at the time that I had read the nose tire should have 30lbs.  Several landings after putting 40 lbs in the nose tire I was getting a shimmy after touchdown, especially when breaking a little after nose wheel touched the ground.  Lately, the tire has lost a little pressure after a couple of months and I've noticed there is no shimmy, even landing a little fast 70-75.  Does nose tire pressure make a difference in causing shimmy?  I believe the tires are 600 ply.  Not sure!  

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