My first video, or "Nose Wheel, the Movie"

[kentb]

OK, I have everything rigged up for movie making and tested out my camera mount (Oregon Scientific camera). I want to know what is going on with my nose wheel during takeoff and landing (who would care about it in flight). My fairing are now off for painting prep (my wrist is sore from sanding).

The first video is of taxi, takeoff and landing at Lenhardt airpark (7S9).

http://www.youtube.com/watch?v=YYCerJM_Qww

The next two are takeoff and landing on pavement one from 7S9 to UAO.

http://www.youtube.com/watch?v=VdOL44YGMX0

and then the return trip from UAO to 7S9.

http://www.youtube.com/watch?v=gY_XTSLBggM

I need to figure out how to turn off the sound because it doesn't help that much. I have edit the last two to reduce the length. The first one I chopped off the front and ends some, but should have edited down the middle to make it shorter. So while you are playing that one just skip over the downwind part of the pattern. I needed to do a 360 for spacing.

All takeoff and landings were done with the stick full aft. Taxi was done at a fast walk. I looks to me as though the most gear movement occurs while doing the taxi. I am not to concerned about my nose wheel on grass strips, but will add some extra support in the nose wheel fairing to disallow the nut to dig in.

Let me know if I didn't explain something in the video and any suggestions on how to improve the quality. It looks like youtube downsamples the videos. I noticed it was hard to see (too dark) sometimes. Next time I think that the camera will be pointing forward.

Kent

[sglaeser]

During these videos, how much static weight was on your nose wheel? (or your best guess?)

[kentb]

I don't have the answer here at work.
I'll get back to you tomorrow.
For now pilot 230 lbs. Fuel about 120 lbs.

Kent

[az_gila]

Originally Posted by kentb

....
All takeoff and landings were done with the stick full aft. Taxi was done at a fast walk. I looks to me as though the most gear movement occurs while doing the taxi. I am not to concerned about my nose wheel on grass strips, but will add some extra support in the nose wheel fairing to disallow the nut to dig in.
......
Kent

A friend visiting some time back with a RV-6A had a bad fore-aft vibration on his nose gear. It was very visible from outside during a slow taxi on smooth asphalt... but he could not feel it inside (note fore-aft, not a side-to-side shimmy).

We looked at his nose wheel, and his axle was too tight. I adjusted it to the "Grumman Standard" of drag of about one revolution when pushed by hand. This fixed the problem.

Apparently the breakout force for the tight bearings was setting up an oscillation... even though it was very visible, I was surprised he couldn't feel it.

Another item to check for on the nose gear....

Kent ... can you check how many revolutions your nose wheel has for a good push by hand when it's off the ground?

gil in Tucson

[kentb]

I forgot to mention that during the conditional inspection I made sure that all tires are at 35 lb and the front wheel breakout force is at 22 lbs.

Kent

[GrayHawk]

Originally Posted by kentb

I forgot to mention that during the conditional inspection I made sure that all tires are at 35 lb and the front wheel breakout force is at 22 lbs.

Kent

As long as you brought it up again (nice video); may as well include all of the data:
- Old/New Fork : looks like old
- Gear leg vintage: ?
- Nose gear breakout: 22 lbs
- Tire Pressure: 35 psi
- Axel type (old/new): ?
- Bearing preload: 1 revolution spin?
- nose wheel static weight:
- What else??

[kentb]

Originally Posted by GrayHawk

As long as you brought it up again (nice video); may as well include all of the data:
- Old/New Fork : looks like old
- Gear leg vintage: ?
- Nose gear breakout: 22 lbs
- Tire Pressure: 35 psi
- Axel type (old/new): ?
- Bearing preload: 1 revolution spin?
- nose wheel static weight:
- What else??

- Old/New Fork : it is old
- Gear leg vintage: Vans late 2004
- Nose gear breakout: 22 lbs
- Tire Pressure: 35 psi
- Axel type (old/new): Vans late 2004
- Bearing preload on the mains: Tightend nut until I could do one rev and then backed off to the last hole (1/6 turn - max 60 degrees). I repacked the bearings with #5 grease.
- Bearing preload on front: Torqued as specfied in the plans, but I can't remember what that was. I will look it up tonight.
- nose wheel static weight: I need to figure this out.

Kent

[GrayHawk]

For comparison, here is the other nose wheel video. Sure wish I knew where the puffs of smoke were coming from and had the same set of data for this video.

www.eaa538.org/azwing/pictures/nosegear.wmv

[LifeofReiley]

Bill,

I don't think that's smoke. Looks to me like a timed reflection of some sort. It also looks as if the wheel has some sort of binding issue. The pulsing sure looks as if it has a pattern.?. IMHO

[GrayHawk]

Originally Posted by LifeofReiley

Bill,

I don't think that's smoke. Looks to me like a timed reflection of some sort. It also looks as if the wheel has some sort of binding issue. The pulsing sure looks as if it has a pattern.?. IMHO

OK, not smoke. Don't want to jump to conclusions! Thanks Darrell.