---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Sun 08/27/17: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:17 AM - Re: [Non-DoD Source] Re: Cj6 lift off without jacks (Roger Kemp) 2. 02:42 PM - Harry Flood (Craig Payne) 3. 08:22 PM - Re: Harry Flood (Roger Kemp) ________________________________ Message 1 _____________________________________ Time: 01:17:06 AM PST US From: Roger Kemp Subject: Re: [Non-DoD Source] Re: Yak-List: Cj6 lift off without jacks Sent from my iPad > On Aug 21, 2017, at 10:47 AM, Bitterlich, Mark G CIV NAVAIR, WD wrote: > > > I guess no one else is going to say it, so I might as well. > > Trying to get the landing gear to come down multiple times is perfectly acceptable. Trying the same thing to get it to go up....... isn't. > > Mark > > > -----Original Message----- > From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Greg Wrobel > Sent: Monday, August 21, 2017 11:31 AM > To: yak-list@matronics.com > Subject: [Non-DoD Source] Re: Yak-List: Cj6 lift off without jacks > > Sorry, somehow a partial message was sent. To continue......... I had two good Jack's but the off sets were longer than necessary. I used a weighed tail stand and with the gear down the aircraft tipped backwards and fell off the jacks. Fortunately nothing was damaged. I have redesigned my Jacks, tail stand AND added the nose stand. It's rock solid. If you have never experienced a gear retraction and especially an emmergecy extension, it can be quite violent especially if someone has removed the restrictors in your air lines over the years. Get good jacks AND both stands!!!!!!! > > On Aug 21, 2017 10:07 AM, "Greg Wrobel" wrote: > > > Bruno, Please, Please, Please read everything everyone is telling you. Jacking the CJ improperly can cause you more trouble and grief than you want to experience!!! Things like the airplane falling off the jacks and going through the wings, or raising the gear and having the Airplane fall off the jacks ending up on the floor! My first experience was two good Jack's with > > On Aug 21, 2017 6:30 AM, "A. Dennis Savarese" wrote: > > > There are 4 jacks needed to jack the CJ properly, and all 4 should be used when jacking the airplane. Not 3...all 4. Nose, Tail and two wing jacks. The wing jacks must allow for the gear doors to clear the jacks when retracting the gear. Also the wing jacks must be designed to properly support the aircraft because with the gear doors having to clear the jacks, there will be an offset needed at the top of the jack to fit into the jack point socket in the wing. That means the wing jack weight distribution is not directly below the jack point. You definitely do not want the airplane "leaning" or back on the wing jacks when the airplane is raised off the ground. Doug Sapp probably has photos of both the original Chinese jacks or of the specialty jacks he designed and sold for the CJ. You may be able duplicate them. > > The nose jack, which cradles the bottom of the engine around the rocker box covers on cylinders 4, 5, 6, and 7, keeps the nose from tipping over. The tail stand is also required because the CJ, unlike the Yak 52, is balanced fore and aft at the wing jack points. (On the Yak 52, the jack points are well aft of the main spar and thus well aft of the CG, making the Yak 52 extremely nose heavy) On the CJ, if you did not have the tail stand and were to step onto the left wing to do a gear retraction test, the tail of the CJ would immediately go right to the ground. > > My recommendation, and I concur 100% with what others have said, is to invest in a PROPER set of jacks for the CJ. Don't be "penny wise and pound foolish" because it can cause you a lot of grief if you use the wrong jacks. > Dennis > > > > > > ________________________________ > > From: Justin Drafts > To: yak-list@matronics.com > Sent: Monday, August 21, 2017 6:49 AM > Subject: Re: Yak-List: Cj6 lift off without jacks > > > Oh wow, I would find some good jacks and tail stand. > This is what the engineers originally intended for lifting the aircraft and properly distributing its weight. Anything else and I think you would put the wrong bending stresses throughout the airframe. Better safe than sorry. > My thoughts... > Justin > > On Aug 21, 2017 3:49 AM, "airmanv2" wrote: > > > > Hi every body, > always with my gear retraction problem. > Looking for advices to lift the cj6 without the special jacks. > is it ok to get a small crane and tide a rope to engine mount, putting the back of the plane on a drum ??? > thank you for help > Bruno > > -------- > Fly safe > > > > > Read this topic online here: > > http://forums.matronics.com/ viewtopic.php?p=472026#472026 > > > > > > > ==== ============================== = > List" rel="noreferrer" target="_blank">http://www.matronics.com/ Navigator?Yak-List > ==== ============================== = > FORUMS - > eferrer" target="_blank">http://forums.matronics.com > ==== ============================== = > WIKI - > errer" target="_blank">http://wiki.matronics.com > ==== ============================== = > b Site - > -Matt Dralle, List Admin. > rel="noreferrer" target="_blank">http://www.matronics.com/ contribution > ==== ============================== = > > > > > > > > > > > > ________________________________ Message 2 _____________________________________ Time: 02:42:06 PM PST US From: Craig Payne Subject: Yak-List: Harry Flood Do we have any 'listers hunkering down in the flood zone? I'm pulling for you and hope all stay safe. Craig Payne ________________________________ Message 3 _____________________________________ Time: 08:22:58 PM PST US From: Roger Kemp Subject: Re: Yak-List: Harry Flood Craig, You pontoon kits for CJ's? Doc Sent from my iPad > On Aug 27, 2017, at 4:40 PM, Craig Payne wrote: > > Do we have any 'listers hunkering down in the flood zone? I'm pulling for you and hope all stay safe. > > Craig Payne ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/yak-list Browse Digests http://www.matronics.com/digest/yak-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.