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mark936(at)webtv.net Guest
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Posted: Mon Jul 16, 2007 10:51 am Post subject: Harmon Rocket HR-2 jack points |
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how are you guys lifting or jacking your planes up for tire changes?
I got ready to use a wing jack on the tie down point and John Harmon
shot that down, said aft of CG and 3/16th bolts.
Lots of RV TW guys are using wing jacks and jacking plane off ground
albeit lighter by two hundred pounds.
I didn't want to stress it by lifting it by the engine mount .
Just curious about different methods.
thx
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jhstarn(at)verizon.net Guest
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Posted: Mon Jul 16, 2007 11:37 am Post subject: Harmon Rocket HR-2 jack points |
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We had some 1/2 thick aluminum scrap and a piece of angle. Cut a 2" hole in the 6" round piece so it kinda looks like a fat horse shoe. Drilled holes in the open end & used a 3/4 angle to close the opening buy installing two bolts. The open end is wide enough to slip onto the gear leg. The angle hits the bottom "thru bolt" and the horse shoe solid end rests on the gear leg. The hole is such that when installed it is level with the ground, we then just put a floor jack under the large part of the horseshoe end (facing inside) & jack it up. We have 2X4" cut & screwed together & rest the axle on them once the wheel is removed......Guess I have to take some photos of our "tools". KABONG
Quote: |
how are you guys lifting or jacking your planes up for tire changes?
I got ready to use a wing jack on the tie down point and John Harmon
shot that down, said aft of CG and 3/16th bolts.
Lots of RV TW guys are using wing jacks and jacking plane off ground
albeit lighter by two hundred pounds.
I didn't want to stress it by lifting it by the engine mount .
Just curious about different methods.
thx
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lschneider39(at)cox.net Guest
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Posted: Mon Jul 16, 2007 11:58 am Post subject: Harmon Rocket HR-2 jack points |
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What would John think of doing one wheel at a time using wing jacks? It
leaves the CG more neutral with one wheel left on the ground and low fuel.
Larry
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mark936(at)webtv.net Guest
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SSmith(at)lacsd.org Guest
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fairlea(at)amtelecom.net Guest
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Posted: Mon Jul 16, 2007 2:03 pm Post subject: Harmon Rocket HR-2 jack points |
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Take a standard gear clamp, or two if you are nervous, and put them on the
lower gear leg socket. Around where the bolt goes through the leg. Place
them so that the "screw" portion is facing down. The provides a lip that a
standard floor jack can grip on to. I, and others, have used this method
for years. Have some blocks ready to put under the axle after the wheel is
removed so that you can take the weight off the jack while you work on the
tire. Make sure you chock the other wheel.
Tom Martin
--
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walter(at)tondu.com Guest
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Posted: Mon Jul 16, 2007 5:55 pm Post subject: Harmon Rocket HR-2 jack points |
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On 07/16 2:28, mark936(at)webtv.net wrote:
>
>
> john likes to lift with straps on engine mount but I heard somewhere
> that you could do possible damage. So I was looking for jacks.
>
> we have a gizmo like Kabong mentioned but with 10 inches of chain for
> one wheel/leg at a time.
>
> I heard that a hoist on the engine for AFT problems along with the wing
> jacks works well since there are six bolts in there.
>
> I'll probably do the hoist either on the engine with straps or leg gear
> after Harry H. finishes with the cherry picker on the field. And I'm
> not there so I won't have much say so. It will just get done.
>
> I have full fuel in the wing.
>
> Thanks for input. (you know how hard it was getting those unused three
> legged jacks in the C-182 from a RV friend at Compton?)
>
> and I'll still have to buy him a bottle of wine.
Dettori Badde Nigolosu from Sardegna, Italy, 1999 vintage. Oh wait,
you can't get any, I just bought the last bottle. How about a beer...
Actually you would think those wings would be able to handle it especially
with a grade 8 bolt, especially if you raised the tail. I thought
rockets were stronger than that. Using the engine mount seems
like a worse idea. The engine mount bolts aren't designed to lift
an entire airplane, just the motor and associated power the engine
develops. Plus, you are going to need a tall jack to get the wheels
off the ground. Just pondering outloud.
--
Walter Tondu
http://www.rv7-a.com - Flying!
http://www.evorocket.com - Building
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T.gummo(at)verizon.net Guest
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Posted: Mon Jul 16, 2007 6:52 pm Post subject: Harmon Rocket HR-2 jack points |
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Quote: |
Actually you would think those wings would be able to handle it especially
with a grade 8 bolt, especially if you raised the tail. I thought
rockets were stronger than that. Using the engine mount seems
like a worse idea. The engine mount bolts aren't designed to lift
an entire airplane, just the motor and associated power the engine
develops. Plus, you are going to need a tall jack to get the wheels
off the ground. Just pondering outloud.
--
Walter Tondu
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It has to do with CG. When I tried to jack the plane at both tie down
points, I looked up to see the tailwheel leave the ground. You have to
either tie the tail down or add weight to the tail to jack both wheels off
the ground at the same time. Say to align the wheel pants.
Tom Gummo
Apple Valley, CA
Harmon Rocket-II
do not archive
http://mysite.verizon.net/t.gummo/index.html
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walter(at)tondu.com Guest
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Posted: Mon Jul 16, 2007 7:04 pm Post subject: Harmon Rocket HR-2 jack points |
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> It has to do with CG. When I tried to jack the plane at both tie down
> points, I looked up to see the tailwheel leave the ground. You have to
> either tie the tail down or add weight to the tail to jack both wheels off
> the ground at the same time. Say to align the wheel pants.
I see, makes sense. I would get a 5 gallon bucket and fill it with
concrete with a tough chain in it, sticking up through the concrete.
Use it to keep the tail imobile. I just don't like the idea of jacking
with the engine mount, just a personal preference.
It's easy with the nose gear planes, which is my only experience.
Thanks for the information.
--
Walter Tondu
http://www.rv7-a.com - Flying!
http://www.evorocket.com - Building
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T.gummo(at)verizon.net Guest
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Posted: Mon Jul 16, 2007 7:48 pm Post subject: Harmon Rocket HR-2 jack points |
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My is a Harmon Rocket II, I don't know anything about the CG with the new
wing.
Tom Gummo
Apple Valley, CA
Harmon Rocket-II
do not archive
http://mysite.verizon.net/t.gummo/index.html
---
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smokyray(at)yahoo.com Guest
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Posted: Thu Jul 19, 2007 7:45 am Post subject: Harmon Rocket HR-2 jack points |
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As for jacking up my Rocket, I use a floor jack with a small block Chevy engine lifting ring removed from the intake manifold bolts. The ring end bolts to the top of my floor jack the the "u" shaped end that bolts to the manifold becomes the lifting "U" that goes underneath my lower gear leg bolts and perfectly cradles the LG leg. Works great and I carry one of the chevy lifting rings in my toolbox, any floor jack will work.
For flat tires I "green slime" all my tubes before I install them (old motocross habit) to avoid flats in the field and carry a "come-along" rated for 3000 lbs. I have lifted my Rocket by the engine mount with the come-along.
Rob Ray
Tom Gummo <T.gummo(at)verizon.net> wrote:[quote] --> Rocket-List message posted by: "Tom Gummo"
My is a Harmon Rocket II, I don't know anything about the CG with the new
wing.
Tom Gummo
Apple Valley, CA
Harmon Rocket-II
do not archive
http://mysite.verizon.net/t.gummo/index.html
---
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