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Distance from ground level to wing tiedowns

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rv10free2fly(at)yahoo.com
Guest

Posted: Mon Jan 04, 2016 12:53 am Post subject: Distance from ground level to wing tiedowns

I'm looking to purchase two long hydraulic jacks and was wondering if someone could please forward me the measurement from ground level, to the tie down point fitting under the wing.



Is anyone selling fittings that attach to the end of a hydraulic jack and screw into the wing tiedowns?



Warm regards and thanks.



Patrick Pulis

Adelaide, South Australia 

RV-10 #40299

Kelly McMullen

Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ

Posted: Mon Jan 04, 2016 5:31 am Post subject: Distance from ground level to wing tiedowns

Don't know the height. Most jacks have indentation in the ram to fit a jack point.



Carriage bolts of the right size have round head that fits that indentation pretty well.



3/8" coarse thread of perhaps 1.5 to 2" works pretty well.



-sent from the microchip implanted in my forearm

 

On Mon, Jan 4, 2016 at 1:50 AM, Patrick Pulis <rv10free2fly(at)yahoo.com.au (rv10free2fly(at)yahoo.com.au)> wrote:

 	  Quote: 	
		  --> RV10-List message posted by: Patrick Pulis <rv10free2fly(at)yahoo.com.au (rv10free2fly(at)yahoo.com.au)>

 

 I'm looking to purchase two long hydraulic jacks and was wondering if someone could please forward me the measurement from ground level, to the tie down point fitting under the wing.

 

 Is anyone selling fittings that attach to the end of a hydraulic jack and screw into the wing tiedowns?

 

 Warm regards and thanks.

 

 Patrick Pulis

 Adelaide, South Australia

 RV-10 #40299

 

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD

Tim Olson

Joined: 25 Jan 2007
Posts: 2872

Posted: Mon Jan 04, 2016 7:19 am Post subject: Distance from ground level to wing tiedowns

This link has some info on the jacks that you may find useful in estimating the right length jack.  Mine are long enough but be sure to factor in that I have steel feet that add a couple inches of length.

These have worked perfectly for years.  Just used them this weekend again.



http://www.myrv10.com/tips/generaltips.html#Jacking_the_RV-10



Tim



 	  Quote: 	
		   On Jan 4, 2016, at 2:50 AM, Patrick Pulis <rv10free2fly(at)yahoo.com.au> wrote:

 

 

 

 I'm looking to purchase two long hydraulic jacks and was wondering if someone could please forward me the measurement from ground level, to the tie down point fitting under the wing.

 

 Is anyone selling fittings that attach to the end of a hydraulic jack and screw into the wing tiedowns?

 

 Warm regards and thanks.

 

 Patrick Pulis

 Adelaide, South Australia 

 RV-10 #40299

Albert Gardner

Joined: 10 Jan 2006
Posts: 455
Location: Yuma, AZ

Posted: Mon Jan 04, 2016 7:52 am Post subject: Distance from ground level to wing tiedowns

I use the Harbor Freight long ram jacks. I drilled a hole in the top of the ram and use a threaded stud that screws into the tiedown point and sets in the top of the jack. Can't fall off of the jack this way. When you want to raise the nose wheel just pull down at the tail tiedown.

Albert Gardner

RV-10 N9914RV

Yuma, AZ

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_________________
RV-9A N872RV
RV-10 N991RV

flying-nut(at)cfl.rr.com
Guest

Posted: Mon Jan 04, 2016 8:11 am Post subject: Distance from ground level to wing tiedowns

I'm curious since there have been a       couple of responses that screw into the tiedown and are fixed to       the top of the jack.  How does the dihedral angle affect insertion       into the tiedown ring that's perpendicular to the bottom of the       wing?????

       Linn  painting .... no wings installed

       

       On 1/4/2016 10:48 AM, Albert wrote:

     

      	  Quote: 	
		                         <![endif]-->   <![endif]-->                

I             use the Harbor Freight long ram jacks. I drilled a hole in             the top of the ram and use a threaded stud that screws into             the tiedown point and sets in the top of the jack. Can't             fall off of the jack this way. When you want to raise the             nose wheel just pull down at the tail tiedown.         

Albert             Gardner         

RV-10             N9914RV         

Yuma,             AZ

tomrv4

Joined: 04 Aug 2015
Posts: 8

Posted: Mon Jan 04, 2016 8:53 am Post subject: Distance from ground level to wing tiedowns

A good question and one I was also concerned about when I built my Harbor Freight jacks.

 I used a 1" socket that I screwed a slotted head bolt thru into the tie down. The jack raises into the socket and allows for the wings to rock slightly if necessary. Plus there's no way the plane can fall off the jack...



Tom



On Jan 4, 2016, at 10:07 AM, Linn Walters <flying-nut(at)cfl.rr.com (flying-nut(at)cfl.rr.com)> wrote:

 	  Quote: 	
		                     I'm curious since there have been a       couple of responses that screw into the tiedown and are fixed to       the top of the jack.  How does the dihedral angle affect insertion       into the tiedown ring that's perpendicular to the bottom of the       wing?????

       Linn  painting .... no wings installed

       

       On 1/4/2016 10:48 AM, Albert wrote:

     

      	  Quote: 	
		                         <![endif]-->   <![endif]-->                

I             use the Harbor Freight long ram jacks. I drilled a hole in             the top of the ram and use a threaded stud that screws into             the tiedown point and sets in the top of the jack. Can't             fall off of the jack this way. When you want to raise the             nose wheel just pull down at the tail tiedown.         

Albert             Gardner         

RV-10             N9914RV         

Yuma,             AZ

_________________
Tom
San Antonio

Tim Olson

Joined: 25 Jan 2007
Posts: 2872

Posted: Mon Jan 04, 2016 9:32 am Post subject: Distance from ground level to wing tiedowns

I have and prefer the socket type thing that I did

too, but after looking at Albert's pictures and

reading Linn's email, I think there are just a couple

of comments on that.



I think Albert's idea is workable.  The things I don't

like are  1) the dihedral issue that Linn pointed out,

and 2) the use of a completely threaded fastener.



The thing is, if it did rock, the threaded fastener would

have that bending force put on at the top of the jack

and could snap the threaded fastener in half.  The problem

would be worse the tighter fit the hole is in the jack

head.



But, in his defense...if you used a big enough hole that

there was some room for the plane to tilt without bending

the bolt in the jack head, there really isn't that much

weight or force on the jack if the plane is kept pretty

level.  So there's no reason that idea couldn't be used

if someone wanted to do it that way.  I just think

that by using a socket on the upper end, you take away

the risk.  If someone really wanted to cobble it together,

I'd say get yourself a metal 1.25" pipe cap and put a bolt

through it with a nut on the back side, then screw that

up into the wing tiedown.



The things I like are then that you can then use a

grade 5 or grade 8 bolt rather than the softer

and weaker carriage bolt or stud.



Anyway, there are many ways to skin the cat.  Maybe

less ways to make the cat taste good when you cook it. 

Tim



On 1/4/2016 10:48 AM, Tom Chapman wrote:

 	  Quote: 	
		   A good question and one I was also concerned about when I built my

 Harbor Freight jacks.



   I used a 1" socket that I screwed a slotted head bolt thru into the

 tie down. The jack raises into the socket and allows for the wings to

 rock slightly if necessary. Plus there's no way the plane can fall off

 the jack...



 Tom



 On Jan 4, 2016, at 10:07 AM, Linn Walters <flying-nut(at)cfl.rr.com

 <mailto:flying-nut(at)cfl.rr.com>> wrote:



> I'm curious since there have been a couple of responses that screw

> into the tiedown and are fixed to the top of the jack.  How does the

> dihedral angle affect insertion into the tiedown ring that's

> perpendicular to the bottom of the wing?????

> Linn  painting .... no wings installed

>

> On 1/4/2016 10:48 AM, Albert wrote:

>>

>> I use the Harbor Freight long ram jacks. I drilled a hole in the top

>> of the ram and use a threaded stud that screws into the tiedown point

>> and sets in the top of the jack. Can't fall off of the jack this way.

>> When you want to raise the nose wheel just pull down at the tail tiedown.

>>

>> Albert Gardner

>>

>> RV-10 N9914RV

>>

>> Yuma, AZ

>>

>

Mauledriver(at)nc.rr.com
Guest

Posted: Mon Jan 04, 2016 10:39 am Post subject: Distance from ground level to wing tiedowns

The answer is 32" from ground to jack       point hole.

       

       My "Harbor Freight" jack had an indentation.  I ground it out a       bit more to make a solid socket for the head of a carriage bolt as       you can see here My         'Harbor Freight' Jack

       

       The jack endured a stability test a few weeks ago when I got stuck       in the mud.  The big flat ply bottom excelled at sitting on top of       the mud as  I jacked a wheel at a time up on to some boards and       rolled her out.  Not damage to pants or anything.  

       

       The key to getting out of mud is to get rid of all the willing       helpers first - devise a plan then invite back only the person or       two you actually need.  That wasn't my first rodeo.

       

       On 1/4/2016 8:21 AM, Kelly McMullen wrote:

     

      	  Quote: 	
		                             Don't know the height. Most jacks have indentation in the             ram to fit a jack point.

           

           Carriage bolts of the right size have round head that fits           that indentation pretty well.

         

         3/8" coarse thread of perhaps 1.5 to 2" works pretty well.

       

                                        -sent from the microchip implanted in my               forearm

           

         

         

         On Mon, Jan 4, 2016 at 1:50 AM, Patrick           Pulis <rv10free2fly(at)yahoo.com.au (rv10free2fly(at)yahoo.com.au)>           wrote:

            	  Quote: 	
		  -->             RV10-List message posted by: Patrick Pulis <[url=mailto:rv10free2fly(at)yahoo.com.au]rv10free2fly(at)yahoo.com.au (rv10free2fly(at)yahoo.com.au)[/url]>

             

             I'm looking to purchase two long hydraulic jacks and was             wondering if someone could please forward me the measurement             from ground level, to the tie down point fitting under the             wing.

             

             Is anyone selling fittings that attach to the end of a             hydraulic jack and screw into the wing tiedowns?

             

             Warm regards and thanks.

             

             Patrick Pulis

             Adelaide, South Australia

             RV-10 #40299

             

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             r>             >             w.buildersbooks.com" rel="noreferrer"             target="_blank">www.buildersbooks.com

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Mon Jan 04, 2016 12:18 pm Post subject: Distance from ground level to wing tiedowns

Sounds good.  What some don't seem to appreciate is that you *need* the 

ability of the aircraft to move small amounts while on the jacks. May be 

that you are raising nose or tail, may be uneven ground under the jack. 

The round head of the carriage bolt works fine. Most retractable 

certified planes have jack points that are just more pointy than the 

carriage bolt. The risk of the plane slipping off the jack is inversely 

proportional to the amount of weight supported by the jack. Highest risk 

for the first couple strokes of the jack, much less after that.



On 1/4/2016 11:35 AM, Bill Watson wrote:

 	  Quote: 	
		   The answer is 32" from ground to jack point hole.



 My "Harbor Freight" jack had an indentation.  I ground it out a bit more

 to make a solid socket for the head of a carriage bolt as you can see

 here My 'Harbor Freight' Jack

 <http://www.mykitlog.com/users/display_log.php?user=MauleDriver&project=224&category=5629&log=108538&row=1>



 The jack endured a stability test a few weeks ago when I got stuck in

 the mud.  The big flat ply bottom excelled at sitting on top of the mud

 as  I jacked a wheel at a time up on to some boards and rolled her out.

 Not damage to pants or anything.



 The key to getting out of mud is to get rid of all the willing helpers

 first - devise a plan then invite back only the person or two you

 actually need.  That wasn't my first rodeo.



 On 1/4/2016 8:21 AM, Kelly McMullen wrote:

> Don't know the height. Most jacks have indentation in the ram to fit a

> jack point.

> Carriage bolts of the right size have round head that fits that

> indentation pretty well.

> 3/8" coarse thread of perhaps 1.5 to 2" works pretty well.

>

> -sent from the microchip implanted in my forearm

>

> On Mon, Jan 4, 2016 at 1:50 AM, Patrick Pulis

> <rv10free2fly(at)yahoo.com.au <mailto:rv10free2fly(at)yahoo.com.au>> wrote:

>

>     

>     <<mailto:rv10free2fly(at)yahoo.com.au>rv10free2fly(at)yahoo.com.au>

>

>     I'm looking to purchase two long hydraulic jacks and was wondering

>     if someone could please forward me the measurement from ground

>     level, to the tie down point fitting under the wing.

>

>     Is anyone selling fittings that attach to the end of a hydraulic

>     jack and screw into the wing tiedowns?

>

>     Warm regards and thanks.

>

>     Patrick Pulis

>     Adelaide, South Australia

>     RV-10 #40299

>

>     ===========

>     br> fts!)

>     r> > w.buildersbooks.com" rel="noreferrer"

>     target="_blank">www.buildersbooks.com

>     rel="noreferrer" target="_blank">http://www.matronics.com/contribution

>               -Matt Dralle, List Admin.

>     ===========

>     -List" rel="noreferrer"

>     target="_blank">http://www.matronics.com/Navigator?RV10-List

>     ===========

>     FORUMS -

>     eferrer" target="_blank">http://forums.matronics.com

>     ===========

>     b Site -

>               -Matt Dralle, List Admin.

>     rel="noreferrer" target="_blank">http://www.matronics.com/contribution

>     ===========

>

>

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

Tim Olson

Joined: 25 Jan 2007
Posts: 2872

Posted: Mon Jan 04, 2016 12:34 pm Post subject: Distance from ground level to wing tiedowns

Yep, and a grade 5 or 8 bolt with a 1.5-2" section of non-threaded area, 

with a point ground in where the hex head would be, would

work well with the normal indented top of the jack too.  Both

the tip of the bolt, and the dished shape of the jack head, would

prevent it from easily slipping off once the weight of the plane is

on the jack.  And you're right, whatever you do, you're not looking

to lock it solidly to the jack at all. It needs to have

movement. My socket that screws into the tiedown is about 1/4"

larger in diameter than the jack head to give it a little wiggle

room of 1/8" on all sides.

Tim



On 1/4/2016 2:14 PM, Kelly McMullen wrote:

 	  Quote: 	
		   



 Sounds good.  What some don't seem to appreciate is that you *need* the

 ability of the aircraft to move small amounts while on the jacks. May be

 that you are raising nose or tail, may be uneven ground under the jack.

 The round head of the carriage bolt works fine. Most retractable

 certified planes have jack points that are just more pointy than the

 carriage bolt. The risk of the plane slipping off the jack is inversely

 proportional to the amount of weight supported by the jack. Highest risk

 for the first couple strokes of the jack, much less after that.

rv10free2fly(at)yahoo.com
Guest

Posted: Mon Jan 04, 2016 1:37 pm Post subject: Distance from ground level to wing tiedowns

Many thanks to all.



Warm regards



Patrick



 	  Quote: 	
		   On 5 Jan 2016, at 07:01, Tim Olson <Tim(at)MyRV10.com> wrote:

 

 

 

 Yep, and a grade 5 or 8 bolt with a 1.5-2" section of non-threaded area, with a point ground in where the hex head would be, would

 work well with the normal indented top of the jack too.  Both

 the tip of the bolt, and the dished shape of the jack head, would

 prevent it from easily slipping off once the weight of the plane is

 on the jack.  And you're right, whatever you do, you're not looking

 to lock it solidly to the jack at all. It needs to have

 movement. My socket that screws into the tiedown is about 1/4"

 larger in diameter than the jack head to give it a little wiggle

 room of 1/8" on all sides.

 Tim

 

> On 1/4/2016 2:14 PM, Kelly McMullen wrote:

> 

> 

> Sounds good.  What some don't seem to appreciate is that you *need* the

> ability of the aircraft to move small amounts while on the jacks. May be

> that you are raising nose or tail, may be uneven ground under the jack.

> The round head of the carriage bolt works fine. Most retractable

> certified planes have jack points that are just more pointy than the

> carriage bolt. The risk of the plane slipping off the jack is inversely

> proportional to the amount of weight supported by the jack. Highest risk

> for the first couple strokes of the jack, much less after that.

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