Has anybody made a jacking cradle?
Moderators: GAHorn, Karl Towle, Bruce Fenstermacher
Has anybody made a jacking cradle?
Just curious how many people on here have jacking cradles? My jacking bracket is crap and I'm always afraid its going to slip and fall on the axles. With a craddle I'd be pretty much guaranteed it won't sleep and I can do a shake test and take the legs off without a problem if I want to remove them. Anybody have any pictures of their craddles? I can't find my book with the plans.
Thanks
Thanks
Here's a simple way to do it. Just place the jacks against carpet covered boards at the fwd spar or directly on the tie-down rings instead.
http://home.earthlink.net/~n6d4/170b.htm
Notice Bob's last two pics which demonstrate how compression tailwheel steering springs can rip out the rear bulkhead and cause other damage.
http://home.earthlink.net/~n6d4/170b.htm
Notice Bob's last two pics which demonstrate how compression tailwheel steering springs can rip out the rear bulkhead and cause other damage.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
cfiatzph,
Do you have a first name? Any way, I went out Friday to check the hanger for the cradle that I said that I would show. I couldn't find it! Then I got thinking, I lent it out about 4 years ago! (I should wright these things down!!!!) I think I have found it! waiting on a call back. but pretty much know where it is! As I said it is pretty simple, two straps running up each side of the gear legs coupled toghter with a few straps and the jack points just inside the leg openings. If you don't have any thing in the gear leg area, you will not have any problem with the type of cradle I have! I can't see anyone putting an antenna in this area! But stranger things have happned! If you are willing to pay for shipping both ways I'll lend it to you any time! Or anyone else! (As long as I'm right and have found it!) But any way, if you elect to go this way, make a copy! (I don't have a pat. or want one) and you have one for yourself, If you like it!
brad
Do you have a first name? Any way, I went out Friday to check the hanger for the cradle that I said that I would show. I couldn't find it! Then I got thinking, I lent it out about 4 years ago! (I should wright these things down!!!!) I think I have found it! waiting on a call back. but pretty much know where it is! As I said it is pretty simple, two straps running up each side of the gear legs coupled toghter with a few straps and the jack points just inside the leg openings. If you don't have any thing in the gear leg area, you will not have any problem with the type of cradle I have! I can't see anyone putting an antenna in this area! But stranger things have happned! If you are willing to pay for shipping both ways I'll lend it to you any time! Or anyone else! (As long as I'm right and have found it!) But any way, if you elect to go this way, make a copy! (I don't have a pat. or want one) and you have one for yourself, If you like it!
brad
John,
That is even more simple than mine! I have two straps running, one up the upper side like yours and a strap running up the lower side. ( so if something slips it will be mitiguated) the two sides are connected toghter and run up the side of the A/C beond the strutt opening. I talked to the person that I thought had my cradle and no joy! (I wonder where It is) I'm sure it will show up. (because the only people that would want it are 170 people) and if I don't find it in the pile of things I have put together since the fire, someone will say (OH brad I have your cradle)!! well see.
brad
That is even more simple than mine! I have two straps running, one up the upper side like yours and a strap running up the lower side. ( so if something slips it will be mitiguated) the two sides are connected toghter and run up the side of the A/C beond the strutt opening. I talked to the person that I thought had my cradle and no joy! (I wonder where It is) I'm sure it will show up. (because the only people that would want it are 170 people) and if I don't find it in the pile of things I have put together since the fire, someone will say (OH brad I have your cradle)!! well see.
brad
Re: Has anybody made a jacking cradle?
The Cessna repair manual has a good one
Re:
Cessna's instructions have you jack the aircraft by lifing AT/UPON THE GEAR LEGS. "The jacking block must be long enough to bear against the landing gear spring, clear of the fuselage." Notice that they are NOT lifting the aircraft by the gearbox/belly. This requires the gear legs to actually be utilized to lift the aircraft. Clearly this requires the gearlegs to remain in place, which is useless if the reason for jacking is to remove the gearlegs. This is why I like lifting the aircraft by the wings at/near the outer strut attach points as you would a retractable Cessna.cfiatzph wrote:Where does the craddle on the bottom of the aircraft attach to? Is it directly between the gear legs? The reason I ask is this particular aircraft has a Garmin 430 will all kinds of stuff sticking out the bottom of the airplane. Markers, transponder, comm etc etc etc.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
Re: Re:
Or lift by the engine mount with a hoist from the overhead or an engine hoist, if you've got one standing around (much cheaper than a set of wing jacks). Put a weight on the floor under the lightest wing, and attach a tiedown rope to it.gahorn wrote:...This is why I like lifting the aircraft by the wings at/near the outer strut attach points as you would a retractable Cessna.
Is there a problem with lifting a 170 this way?
John
John Renwick
Minneapolis, MN
Former owner, '55 C-170B, N4401B
'42 J-3 Cub, N62088
'50 Swift GC-1B, N2431B, Oshkosh 2009 Outstanding Swift Award, 2016 Best Continuously Maintained Swift
Minneapolis, MN
Former owner, '55 C-170B, N4401B
'42 J-3 Cub, N62088
'50 Swift GC-1B, N2431B, Oshkosh 2009 Outstanding Swift Award, 2016 Best Continuously Maintained Swift