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Lift sling for the CH-701

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cgbrt(at)mondenet.com
Guest

Posted: Sun Jan 27, 2008 8:49 am Post subject: Lift sling for the CH-701

I would like to use a sling to lift my a/c to  removal  and inspect the main gear spring. I have seen slings for other  high wing a/c that attach to the fuselage wing attach point and they look very  functional.

 Has anyone done this? Has Chris H approved lifting  the 701 this way? Any help appreciated. Please reply on this list.

 Carl

    [quote][b]

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lgold(at)quantum-associat
Guest

Posted: Sun Jan 27, 2008 11:50 am Post subject: Lift sling for the CH-701

Carl,

 Paul Reinders, a very experienced (35,000 hour) Alaskan  pilot who has a 701 ski/float plane, attached tangs to the plane for picking it  up to change skis and floats. The tangs need to be placed facing  upward and running parallel with the air flow on both forward wing root  attachment points at the place where the wing is bolted to the  fus.  

  

 My 701 does not have any main gear spring (although  the gear probably has some spring in it). Does your 701 have  some new or specially designed gear?

  

 Regards,

Les 



 [quote]         From: owner-zenith-list-server(at)matronics.com    [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of    Carl

Sent: Sunday, January 27, 2008 8:11 AM

To:    zenith-list(at)matronics.com

Subject: Lift sling for the    CH-701

   

   I would like to use a sling to lift my a/c to    removal  and inspect the main gear spring. I have seen slings for other    high wing a/c that attach to the fuselage wing attach point and they look very    functional.

   Has anyone done this? Has Chris H approved    lifting the 701 this way? Any help appreciated. Please reply on this    list.

   Carl

 	  Quote: 	
		  



href="http://www.matronics.com/Navigator?Zenith-List">http://www.matronhref="http://forums.matronics.com">http://forums.matronics.com

href="http://www.matronics.com/contribution">http://www.matronics.com/c

	
[b]

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cgbrt(at)mondenet.com
Guest

Posted: Wed Jan 30, 2008 6:52 pm Post subject: Lift sling for the CH-701

Les.

 Thanks for the info.

 Ref your question on gear spring, I use the  original ZAC gear spring with 950 amphib floats. In my humble opinion this  configuration is superior to some new floats I have seen for the following  reason:

 1. Config change from floats to wheel/skis and back  is simple using the same spring.

 2. Retain nose wheel steering.

 3. Low centre of gravity for better cross-wind  capability on land or water..

 4. Spring reduces shock to fuselage during  TO/landing on land or choppy water.

 5. Lower access for entry/exit.

 6. One of the lightest amphib gears for the 701. My  floats weigh less than 60# each and that is with steel wheels and  hyd  brakes, water rudder and air actuator.

  

 The most important feature for those of us that are  fallible, if you forget to retract the wheels and land on water the a/c will  very likely remain upright. If for some reason you plan a water landing with the  gear down and do it as per ZAC procedure, the gear will not cause an  upset and the landing is very near normal.

  

 It is possible that the lower config will  accelerate prop erosion. in my case with a WarpDride three bade and 500 hrs on  the water erosion has been insignificant.

 Carl

  

   

 [quote]   ---

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davids601xl(at)yahoo.com
Guest

Posted: Thu Jan 31, 2008 11:08 am Post subject: Lift sling for the CH-701

Hi Carl. 

I would certainly recommend that you do NOT lift your

aircraft by the wing root attach points.  The vertical

forces on the attach points nearly cancel themselves

out to zero in normal flight conditions.  They are not

designed to take any appreciable vertical loads. 

Mostly they handle the horizontal loads created by the

lift struts.  Just take a look at the number of rivets

holding the cromoly frame to the fuselage.  



I have seen this done but it was certainly NOT

designed to take such loads and the rivets may have

been overstressed. At the very least you may break

your windscreen as happened in this case.



Just my 2 cents. 

David

--- Carl <cgbrt(at)mondenet.com> wrote:



[quote] Les.

 Thanks for the info.

 Ref your question on gear spring, I use the original

 ZAC gear spring with 950 amphib floats. In my humble

 opinion this configuration is superior to some new

 floats I have seen for the following reason:

 1. Config change from floats to wheel/skis and back

 is simple using the same spring.

 2. Retain nose wheel steering.

 3. Low centre of gravity for better cross-wind

 capability on land or water..

 4. Spring reduces shock to fuselage during

 TO/landing on land or choppy water.

 5. Lower access for entry/exit.

 6. One of the lightest amphib gears for the 701. My

 floats weigh less than 60# each and that is with

 steel wheels and  hyd brakes, water rudder and air

 actuator.

 

 The most important feature for those of us that are

 fallible, if you forget to retract the wheels and

 land on water the a/c will very likely remain

 upright. If for some reason you plan a water landing

 with the gear down and do it as per ZAC procedure,

 the gear will not cause an upset and the landing is

 very near normal.

 

 It is possible that the lower config will accelerate

 prop erosion. in my case with a WarpDride three bade

 and 500 hrs on the water erosion has been

 insignificant.

 Carl

 

   

   ---

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victorbravo(at)sbcglobal.
Guest

Posted: Thu Jan 31, 2008 12:30 pm Post subject: Lift sling for the CH-701

IMHO, it will be very safe to use a three point sling under the 

fuselage. Wrap one loop of nylon strap around the upper engine mount(s) 

AT the firewall for the front lift point, one nylon strap looped around 

the fuselage just in front of the wing, and one nylon strap looped 

around the fuselage just behind the wing. Tie thin rope between each of 

the straps on both sides of the fuselage so the straps do not slide back 

and forth relative to each other.Join the straps to a steel tube or 

"load leveler" device under the crane or winch. This will divide the 

weight between three points and not put any loads on any of your lifting 

structure or fittings. It would seem that the issue of where to lift the 

aircraft is a perfect question to pose to Chris Heintz, because he knows 

more than anyone which points are loaded which way and how much.

 	  Quote: 	
		   



 Hi Carl. 

 I would certainly recommend that you do NOT lift your

 aircraft by the wing root attach points.

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cgbrt(at)mondenet.com
Guest

Posted: Fri Feb 01, 2008 7:15 pm Post subject: Lift sling for the CH-701

To Les, David and Bill 

Thanks for the info and advice. I will talk to Chris H..

Carl

Do nor archive

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lgold(at)quantum-associat
Guest

Posted: Sat Feb 02, 2008 11:11 am Post subject: Lift sling for the CH-701

Carl,

I suggest you contact Paul Reinders. He has a 701 that  he changes from floats to skies by lifting the plane from these attachment  points. I trust Paul. He has 35000 flight hours to his credit.

I'm an  engineer and see no apparent reason why you should not lift the plane from the  wing root attach points and, as I said, Paul has been doing this for some time  now.

For more information email Paul at paaual(at)juno.com (paaual(at)juno.com)

Les 



[quote]  --

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