MadMan Posted September 23, 2008 Share Posted September 23, 2008 I just noticed that I some how installed the rear LG bulkhead in backwards (8 plies to the rear) and I already drill the holes for the strut. Do I need to remove and build another one or will it be OK like it is? Quote Link to comment Share on other sites More sharing options...
rickh Posted September 23, 2008 Share Posted September 23, 2008 I was thinking you could add additional plys to the front face, and deal with the weight penalty. The problems will be down the road when you add the tubes to the LG strut ears, it won't fit between the bulkheads. Cut it out, reverse it. If the holes don't line up, fill them with flox (unless way out of line, you'll enlarge them later), and redrill once you've added one of the final LG bulkhead reinforcements. YMMV. Rick Quote Rick Hall; MK-IV plans #1477; cozy.zggtr.org Build status: 1-7, bits of 8-9, 10, 14 done! Working on engine/prop/avionics. Link to comment Share on other sites More sharing options...
TMann Posted September 23, 2008 Share Posted September 23, 2008 I did the same thing with F22 on my Long-EZ. After kicking myself for making such a mistake, I tried to salvage the bulkhead but in the end I could not. Once I realized it was not worth saving, the remanufacturing went real fast. Overall it did not cost me that much time and I don't have to worry about it causing me a problem down the road. My suggestion...... make a new one. Quote T Mann - Loooong-EZ/20B Infinity R/G Chpts 18 Velocity/RG N951TM Mann's Airplane Factory We add rocket's to everything! 4, 5, 6, 7, 8. 9, 10, 14, 19, 20 Done Link to comment Share on other sites More sharing options...
steve Posted September 23, 2008 Share Posted September 23, 2008 just add the plys and move on, the tube will fit fine Quote Steve M. Parkins Link to comment Share on other sites More sharing options...
Marc Zeitlin Posted September 23, 2008 Share Posted September 23, 2008 RickH and Tmann are correct. Take it out and either flip it, if possible, or remake it. Do not, with structurally critical components, think that it's OK to make things up as you go along, as others may recommend. There's generally a reason why things are designed as they are, and unless you can get the information out of either Burt or Nat's head, it's best to do what the plans say. Quote Marc J. Zeitlin Burnside Aerospace marc_zeitlin@alum.mit.edu www.cozybuilders.org copyright © 2024 Link to comment Share on other sites More sharing options...
steve Posted September 24, 2008 Share Posted September 24, 2008 RickH and Tmann are correct. Take it out and either flip it, if possible, or remake it. Do not, with structurally critical components, think that it's OK to make things up as you go along, as others may recommend. There's generally a reason why things are designed as they are, and unless you can get the information out of either Burt or Nat's head, it's best to do what the plans say. i have to go with answer 4 as well.i have seen a gear hit so hard that it was flat, and it removed about 5" of foam all around the bulk head . so if you were to add plys to the back side a the landing bh then hit hard you would remove both layups and 5" of foam. marc is right.....but, add the plys and move on Quote Steve M. Parkins Link to comment Share on other sites More sharing options...
MadMan Posted September 24, 2008 Author Share Posted September 24, 2008 Hi I did as Steve said, and added the plies to the front it only added about 3/64"s to the thickness, I was a little wide on the 8" dim. so now its exactly 8" I tried to contact Mr Puffer today, but they were not home. I made the mistake by looking at drawing M-9 if you look at the drawing the front of the rear bulkhead looks to have the 3 ply side to the front. I'll be sure to always check the text from now on. Quote Link to comment Share on other sites More sharing options...
Jason Heath Posted September 24, 2008 Share Posted September 24, 2008 Hi I did as Steve said, and added the plies to the front it only added about 3/64"s to the thickness.... Sorry Steve, I would have gone with answer #5, knowing that the 8 screws used for attaching MG-1 & 2 will most likely need to be longer now and that the MG-4's may not be long enough to completely bear on MG-1 due to the increased thickness of the bulkhead depending on Madman's layup thickness in the additional plys added in chapter 7 & 9. While that doesn't seem like a big deal to order different bolts and make longer MG-4's if needed, it does say something about the "make things up as you go along....." statement as there is (typically) something in the next chapter or later that will bite you, and flipping that bulkhead or having to rebuilt it may have been easier and might have saved some head scratching later. I think I just agreed with TMann too?? ...........I need a drink! Quote Regards, Jason T Heath MarkIV #1418 heathjasont@yahoo.com Link to comment Share on other sites More sharing options...
steve Posted September 25, 2008 Share Posted September 25, 2008 Sorry Steve, I would have gone with answer #5, knowing that the 8 screws used for attaching MG-1 & 2 will most likely need to be longer now and that the MG-4's may not be long enough to completely bear on MG-1 due to the increased thickness of the bulkhead depending on Madman's layup thickness in the additional plys added in chapter 7 & 9. While that doesn't seem like a big deal to order different bolts and make longer MG-4's if needed, it does say something about the "make things up as you go along....." statement as there is (typically) something in the next chapter or later that will bite you, and flipping that bulkhead or having to rebuilt it may have been easier and might have saved some head scratching later. I think I just agreed with TMann too?? ...........I need a drink! that sounds like good "year one thinking" but I'm at year 5 , sorryand at year five....WE FIX SHI* and move on. remember what Randi said 3 years back measure with mic's, mark with a sharpie, trim with a chain saw. there is flex in that bulk head:rolleyes: Quote Steve M. Parkins Link to comment Share on other sites More sharing options...
TMann Posted September 25, 2008 Share Posted September 25, 2008 that sounds like good "year one thinking" but I'm at year 5 , sorry,,,I know a guy that's in year 12 of his Berkut project so is he a better source of information? All I can say is that it is a bad precedence to accept less that perfect before you even skin your fuselage. I didn't want to cut out my bulkhead but it only set me back a partial day. I was able to remanufacture it between other tasks I was working on an had it done in one day. When I was done, I was sure I had done the right thing. Quote T Mann - Loooong-EZ/20B Infinity R/G Chpts 18 Velocity/RG N951TM Mann's Airplane Factory We add rocket's to everything! 4, 5, 6, 7, 8. 9, 10, 14, 19, 20 Done Link to comment Share on other sites More sharing options...
Jason Heath Posted September 25, 2008 Share Posted September 25, 2008 that sounds like good "year one thinking" but I'm at year 5 , sorry and at year five....WE FIX SHI* and move on. Steve, as of last summer, you hadn't even completed all of those layups or installed the MG plates in anticipation of using retracts, I know becuase I responded to the post you made inquiring about them, so please, none of this 5 year crap!! I haven't used any SHI* on my plane yet, haven't seen it in the plans, but when I do, I'll call you for assistance. there is flex in that bulk head:rolleyes:Not after you install all the required plys and close out the top there isn't! They will only "flex" if your gear leg doesn't have a machine fit and you try to compress the bulkheads onto the strut when you tighten the 1/2" studs, which is bad...... but at year 5, you should already know that! And that's twice in less than 12 hours you've made me agree with TMann............Waitress!! Quote Regards, Jason T Heath MarkIV #1418 heathjasont@yahoo.com Link to comment Share on other sites More sharing options...
MadMan Posted September 30, 2008 Author Share Posted September 30, 2008 Hi Builders I just wanted to say that I E-mail Mr. Puffer (as Marc Z said I should do) about the stupid mistake I made installing the Rear Landing Gear Bulkhead in backwards (8 plies to the rear) and his reply was it would be OK to add the plies to the front. Quote Link to comment Share on other sites More sharing options...
ErlendM Posted December 12, 2009 Share Posted December 12, 2009 I just passed the stupidity-test and did the same thing - i.e. mounting the aft landing-gear bulkhead with the plies facing backwards. Just curious to know - before I hack them loose again - why does it matter what side the 8 plies are? Quote Erlend Moen Norway Cozy MK IV #1556 - Chapter 16http://cozy.ljosnes.no Link to comment Share on other sites More sharing options...
Lynn Erickson Posted December 12, 2009 Share Posted December 12, 2009 I just passed the stupidity-test and did the same thing - i.e. mounting the aft landing-gear bulkhead with the plies facing backwards. Just curious to know - before I hack them loose again - why does it matter what side the 8 plies are? Yes, the extra plys take the shear load of the bolt. if there is space between the landing gear tab and the extra plys there will be a bending load on the bolt. not good Quote Evolultion Eze RG -a two place side by side-200 Knots on 200 HP. A&P / pilot for over 30 years Link to comment Share on other sites More sharing options...
ErlendM Posted December 13, 2009 Share Posted December 13, 2009 Yes, the extra plys take the shear load of the bolt. if there is space between the landing gear tab and the extra plys there will be a bending load on the bolt. not good Ah.... I see. That makes sense. Off it goes Thanks! Quote Erlend Moen Norway Cozy MK IV #1556 - Chapter 16http://cozy.ljosnes.no Link to comment Share on other sites More sharing options...
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