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Jacking Point

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Matt Dralle
Site Admin

Joined: 08 Nov 2005
Posts: 25704
Location: Livermore CA USA

Posted: Wed Jun 30, 2010 7:01 pm Post subject: Jacking Point

Okay, so I'm sure this has been asked a few times already, and I should search the archive, but what the heck, let's start a new thread.



I got my new tires today (Goodyear Custom Flight III, btw.  Super sweet.) and started looking for ways to get them on.  I can really only see two ways to jack the plane up easily with a normal jack.



1) I could put a short saw horse under the wing tie down and then put a hydraulic jack on it and lift the side of the airplane up by this point.  If I just gently lift the plane by hand at this point, it seems like that's an awful lot of weight to be lifting that far out on the wing.  Can the spars really handle this?



2) I could put a saw horse under the lower engine mount bolt to the firewall and use a hydraulic jack to lift the plane up.  This seems less scary, but I question the shear strength of the bolt lifting all of the weight by this single point.



What's the convential wisdom on jacking a tail dragger RV-8 to change the tires?  There has to be a way with out building some elaborate dolphin contraption.



BTW, with regards to my tire wear, since there's a fair amount of camber(?) afforded by the Grove gear, I've got nearly all the wear on the outside 50% of the tread.  I could probably rotate them 180 degrees and get another 70 hours of flight time, which wouldn't be bad for 22-year old stock kit tires from Van's (remember, I swiped them from the RV-4 project after the brake incident).  But, I probably should have rotated them a bit sooner.  While there's not cord showing, the tread is gone.  Live and learn; I'll be rotating these GYCFIII's in a more timely manner.  If I can double my wear life by rotating because of the camber, I might get 1000 hours out of these babies!  

Matt Dralle

RV-8 #82880 N998RV

http://www.mattsrv8.com - Matt's RV-8 Construction Blog

http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel

Status: Enjoying The Fruits of 2500 Hours of Labor!

_________________
Matt Dralle
Matronics Email List Administrator

HCRV6(at)comcast.net
Guest

Posted: Wed Jun 30, 2010 7:54 pm Post subject: Jacking Point

Matt, 



When you lift the wing up at the tie down point to change a tire you are putting approximately a one "g" load on the spar.  Have you forgotten that these wings have been tested to ten "g's"?



BTW, congrats on the Flight Custom III's, you're gonna like "em.  And regardless, you are going to have to rotate them every hundred hours or so to even out the wear.



BBTW, when you jack up the wing it is going to want to shift toward the low side.  Best to use a floor jack on wheels and set it up so that it can roll toward the low side maybe six inches or so as the high wing is raised.



Harry Crosby

RV-6 N16CX, 705 hours



---

Vanremog(at)aol.com
Guest

Posted: Wed Jun 30, 2010 10:02 pm Post subject: Jacking Point

Matt-

  

 I would hope that each wing could in fact support nine times this weight,  since by definition that is their job.

  

 I screw a lifting eye into the tie down bracket and use a floor jack  mounted on a plastic crate to lift each side in turn.  A pretty easy  job.

  

 -GV

  

  In a message dated 6/30/2010 8:02:45 P.M. Pacific Daylight Time,  dralle(at)matronics.com writes:

  	  Quote: 	
		  1) I    could put a short saw horse under the wing tie down and then put a hydraulic    jack on it and lift the side of the airplane up by this point.  If I just    gently lift the plane by hand at this point, it seems like that's an awful lot    of weight to be lifting that far out on the wing.  Can the spars really    handle this?

	


  [quote][b]

Rick Galati

Joined: 10 Jan 2006
Posts: 91
Location: Lake St. Louis MO.

Posted: Thu Jul 01, 2010 3:27 am Post subject: Jacking Point

Hey Matt,



I use two entirely different methods to jack up my RV-8 and both systems work very well. The first method uses a commonly available bottle jack from Harbor Freight. Many builders before me have made their own version of a wing jack based upon the HF bottle jack and my interpretation is no exception. Investing just a few hours work using off the shelf parts, the Harbor Freight bottle jack be quickly transformed into a very useful wing jack.



http://tinyurl.com/7eb5ed 



The second method I use is the "Handy Jack."  Using leverage, it too is a quick and very easy way to lift an RV8 wheel clear of the floor. 

 

http://www.rvtraining.com/html/atp//html/products_pics.html#RVJACK



Rick Galati

RV6A N307R

RV-8 N308R

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Dale Ensing

Joined: 11 Jan 2006
Posts: 571
Location: Aero Plantation Weddington NC

Posted: Thu Jul 01, 2010 4:23 am Post subject: Jacking Point

Rick,

Did you make any kind of stabilizing frame for the bottle jack or use them 

as purchased? Would be interested in pictures or description if you made 

stabilizer.



I too have a set of the HF bottle jacks. A "pocket" was created on the top 

of the shaft to fit the plastic screw in buttons in the tie down fixtures 

( from Van's) Did this with a large counter sink tool. This makes a secure 

point at the wing. But, I am always a little concerned about the jack 

tipping while jacking or if I bump the airplane while on the jacks - even 

with the other wheel chocked.

Dale Ensing

RV-6A



---

_________________
Dale Ensing
RV-6A
Aero Plantation
Weddington NC

Rick Galati

Joined: 10 Jan 2006
Posts: 91
Location: Lake St. Louis MO.

Posted: Thu Jul 01, 2010 4:45 am Post subject: Re: Jacking Point

 	  Dale Ensing wrote: 	
		  Rick,

Did you make any kind of stabilizing frame for the bottle jack or use them 

as purchased? Would be interested in pictures or description if you made 

stabilizer. 	
 Dale,



I made up the jack in about 4 hours using a 2'X2'X3/4" precut piece of plywood as its base, two 3-1/2" band clamps and one 10' stick of 1/2" electrical conduit all purchased from Home Depot. In practice I find the jack to be very stable. Perhaps it helps that the ball joint I fashioned from a spare tie-down ring is allowed a small degree of movement within its socket on the jack itself and that allows the ball to find its own center under load while lifting the wing.  



Rick

Deerlake(at)bresnan.net
Guest

Posted: Thu Jul 01, 2010 6:44 am Post subject: Jacking Point

I didn't see it mentioned in this thread.  Avery makes this: 

http://www.averytools.com/p-181-rv-jack-stand.aspx  and it's what I used 

when changing tires on my RV.  After seeing what happens to an airplane 

wing when it falls off the jack (no, not me.  It was a Bonanza), I 

thought this method made a lot of sense and it worked very well.



Bob Skinner

wdleonard(at)gmail.com
Guest

Posted: Thu Jul 01, 2010 7:54 am Post subject: Jacking Point

On Thu, Jul 1, 2010 at 7:41 AM, Bob <Deerlake(at)bresnan.net (Deerlake(at)bresnan.net)> wrote:

 	  Quote: 	
		   --> RV-List message posted by: Bob <Deerlake(at)bresnan.net (Deerlake(at)bresnan.net)>

 

 I didn't see it mentioned in this thread.  Avery makes this: http://www.averytools.com/p-181-rv-jack-stand.aspx  and it's what I used when changing tires on my RV.  After seeing what happens to an airplane wing when it falls off the jack (no, not me.  It was a Bonanza), I thought this method made a lot of sense and it worked very well.

  

 Bob Skinner



	




But then how do you get the wheel off?

-- 

David Leonard



Turbo Rotary RV-6 N4VY

http://N4VY.RotaryRoster.net

 http://RotaryRoster.net

  [quote][b]

khorton01(at)rogers.com
Guest

Posted: Thu Jul 01, 2010 8:48 am Post subject: Jacking Point

On 2010-07-01, at 10:41 , Bob wrote:



 	  Quote: 	
		   

 

 I didn't see it mentioned in this thread.  Avery makes this: http://www.averytools.com/p-181-rv-jack-stand.aspx  and it's what I used when changing tires on my RV.  After seeing what happens to an airplane wing when it falls off the jack (no, not me.  It was a Bonanza), I thought this method made a lot of sense and it worked very well.


	




That won't work in Matt's RV-8, as it doesn't have hollow axles.

--

Kevin Horton

RV-8

Ottawa, Canada

http://www.kilohotel.com/rv8

rice737(at)msn.com
Guest

Posted: Thu Jul 01, 2010 1:44 pm Post subject: Jacking Point

For my RV8, I have the handy jack from avery. Works great and nothing is in the way when taking the wheel off.   http://www.averytools.com/p-913-the-handy-jack-eldorado-aviation.aspx

  

 Paul Rice

 

 

 	  Quote: 	
		   Subject: Re: Re: Jacking Point

 From: khorton01(at)rogers.com

 Date: Thu, 1 Jul 2010 12:35:44 -0400

 To: rv-list(at)matronics.com

 

 --> RV-List message posted by: Kevin Horton <khorton01(at)rogers.com>

 

 On 2010-07-01, at 10:41 , Bob wrote:

 

 > --> RV-List message posted by: Bob <Deerlake(at)bresnan.net>

 > 

 > I didn't see it mentioned in this thread. Avery makes this: http://www.averytools.com/p-181-rv-jack-stand.aspx and it's what I used when changing tires on my RV. After seeing what happens to an airplane wing when it falls off the jack (no, not me. It was a Bonanza), I thought this method made a lot of sense and it worked very well.

 

 

 That won't work in Matt's RV-8, as it doesn't have hollow axles.

 --

 Kevin Horton

 RV-8

 Ottawa, Canada

 http://www.kilohotel.com/rv8

 

 

 

 

 

 

 

&========================> 
	


[quote] 

 

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