|
-
POSTING RULES

-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|

06-25-2007, 09:41 AM
|
 |
|
|
Join Date: Dec 2006
Location: TexaRado
Posts: 772
|
|
[quote=Leland]
Quote:
|
Originally Posted by GrayHawk
8. Land as slow as I can
QUOTE]
Last Thanksgiving I landed too slow at an airport I was unfamiliar with. My -9A stalled a foot or so above the runway, hit hard on the mains, and then immediately banged the nosewheel so that it "twanged". My best landings are done coming over the fence at 60 knots and rounding out until the mains kiss the runway, holding the nose off until elevator authority is nearly gone, and then lowering it. Full stall landings are not the way to go here.
Leland
|
Agreed! I took no stalling as a given, but will modify the list. I usually am at 80 mph over the fence, 70 mph over the numbers, which is about the same as your 60 knots. (5040' elevation airport) Also good point on gently lowering nose before elevator authority is gone.
Last edited by GrayHawk : 06-25-2007 at 09:53 AM.
|

06-25-2007, 09:49 AM
|
|
Banned
|
|
Join Date: May 2006
Location: Phoenix, Az
Posts: 920
|
|
Previous damage and fatigue
Here's another angle, illustrated by the fellow who stalled his airplane a foot off the ground.........Have the accident airplanes sustained unrecognized
damage in landing incidents previous to the nose gear collapse that has weakened them? Does nosewheel shimmy fatigue the nosewheel strut?
|

06-25-2007, 01:00 PM
|
 |
|
|
Join Date: Jan 2005
Location: Near Scipio, in Southern Indiana
Posts: 1,779
|
|
Same config
My nosewheel setup is the same as Alex's, solid bar through. It is a bit more difficult to set bearing play as it requires washer shims. The thicker the shim, the looser the bearings. It seems like a good system, however. Mine were originally on a 6A built in about '94 and i got it with a FWF package when the plane was destroyed by hurricane Charlie. Anyone know why this design ws dropped?
After over 100 landings, trying many different approaches, I believe the soft field approach is the way to go also. Full stall works well IF it is done perfectly. My flying isn't perfect, although I won't tell my wife that. The nose is easy to keep off the ground, even with some initial braking. On touchdown, I hit the flap switch (up) as I seem to be able to hold the nose off longer that way. With a FP, I am usually at idle on short final. A touch of power doesn't hurt, but that of course depends on the field/conditions. Haven't tried grass yet and think I'll wait until I have the new fork.
Bob Kelly
__________________
Bob Kelly, Scipio, Indiana
Tech Counselor
Founder, Eagle's Nest Projects
President, AviationNation, Inc
RV-9A N908BL, Flying
|

06-25-2007, 02:16 PM
|
 |
|
|
Join Date: Aug 2005
Location: Pasadena CA
Posts: 2,484
|
|
Why not go with a setup like certified airplanes have? Have a solid tube that the bearings fit over, then make a nosewheel fork that the tube fits through, and just torque the whole thing down with spacers... hmm, doens't sound as clear without a picture...
__________________
Stephen Samuelian, CFII, A&P IA, CTO
RV4 wing in Jig @ KPOC
RV7 emp built
|

06-25-2007, 02:48 PM
|
 |
|
|
Join Date: May 2005
Location: Canby, Oregon
Posts: 1,786
|
|
I reread that thread.
Quote:
|
Originally Posted by n5lp
|
I didn't see what the new torque setting would be for the axle after making the modification.
Roberta, anyone?
Kent
__________________
Kent Byerley
RV9A N94KJ - IO320, CS, tipup
AFS 3500, TT AP, FLYING....
Canby, Or
|

06-13-2008, 07:37 PM
|
 |
|
|
Join Date: Sep 2005
Location: Maple Grove, MN
Posts: 2,334
|
|
Powerful evidence:
Pete Howell sent me this link:
http://kitplanesmag.blogspot.com/200...gh-flight.html
This is powerful, even conclusive, evidence in support of the theory I put forward at the beginning of this thread. Specifically, that some sort of deflection in the fork/axle assembly is causing bearing drag to increase with a positive feedback cycle. It appears that the -10 can tolerate a locked nose wheel, thankfully for this -10.
Note that the nose wheel was heard to lock during takeoff also.
Smooth runway, can't blame that.
It is not clear to me if the -10 has gone through more than one nose wheel axle/bearing support design or not.
It would be very helpful if someone could post pictures of the components of a -10's axle setup.
I will try to find more details on this specific -10's axle arrangement.
My judgment is that this is a primary cause of many of the flip over accidents.
__________________
Alex Peterson
RV6A N66AP 1700+ hours
KADC, Wadena, MN
|

06-14-2008, 09:27 AM
|
 |
|
|
Join Date: Mar 2005
Location: Calgary, Canada
Posts: 5,766
|
|
Any design where the outer spacers exert force on the bearings through the rubber seals is imprecise at best for establishing consistent preload.
The original RV10 parts used thin wall stainless tubing instead of aluminum outer spacers. This was a really bad design as there was a tiny contact area against the curved portion of the inner race. The tubing wore down a bit and started spinning against the fork, cutting into it. This ruined the fork and led to very loose assemblies with no preload. The good part was that the spacers did not press against the rubber seals.
Van's then went back to thick walled aluminum outer spacers which pressed against the rubber seals again. Arrgggh. Wheel bearing design is not one of their strong points.
There is plenty of discussion here: http://www.vansairforce.com/communit...10+front+wheel
|

06-14-2008, 10:01 AM
|
 |
|
|
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
|
|
Does this look right?
This is the picture from the Kitplanes blog the Alex linked to above...
Something seems funny with the gear leg at the lower bend.... or am I just seeing things?....
Is it a welded repair?....
gil A
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
|

06-14-2008, 11:34 AM
|
|
|
|
Join Date: Mar 2007
Location: Sonoma County
Posts: 3,821
|
|
HERE IS A PICTURE.....
Quote:
Originally Posted by osxuser
Why not go with a setup like certified airplanes have? Have a solid tube that the bearings fit over, then make a nosewheel fork that the tube fits through, and just torque the whole thing down with spacers... hmm, doens't sound as clear without a picture...
|
This is a picture from the service manual of my 76 piper.....

The felt dust seal rides on the outside of the spacer. 
To install this, you place #25 spacers into the bearing dust seals and slide the wheel and spacers in between the fork. Then slide in the AXLE #26. It passes through the fork hole. Then install #28 the plugs and the rod #27. As you can see, there is NO LOAD ON THE BOLT (ROD) #27. And these nose wheels take a beating as Pipers only trainer...
Last edited by gasman : 06-14-2008 at 01:52 PM.
|

06-14-2008, 07:19 PM
|
|
|
|
Join Date: Aug 2006
Location: spokane, wa
Posts: 805
|
|
Quote:
Originally Posted by Leland
Last Thanksgiving I landed too slow at an airport I was unfamiliar with. My -9A stalled a foot or so above the runway, hit hard on the mains, and then immediately banged the nosewheel so that it "twanged". My best landings are done coming over the fence at 60 knots and rounding out until the mains kiss the runway, holding the nose off until elevator authority is nearly gone, and then lowering it. Full stall landings are not the way to go here.
Leland
|
Yup you are so right. I see all the time, RV's landing flat with a nose wheel, that is a definate no no. Heck I remember back when I was learning to fly, I thought I did a good landing, than the instructor said, " that was awful". I said what? he said you landed on the nose wheel. Oh, I said, your not suppose to do that, he said no way, try again. I made him happy by doing touch and goes without touching the nose wheel on the runway. It was actually fun and I felt it was a test of my ability to land correctly.
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 06:51 AM.
|