 Barry, my office xp spell-checker works on this forum! I just get my gniffers in a knot, sometimes! 
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 Thanks for the Info Barry I never thought of running the xp office spell checker open along side the web page thank you for that too. Will get on to that link re the Whirly U/Cart
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I didn't know I had changed my name to Barry!
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sorry Eric I ws say thanks to Barry for the info re The WW pictures and really Ive no excuse for not thanking you for the spell check advise though found that there is a spelling checking in the google toolbar Cheers Antnee (mekes us a cuppa tea our Antnee)
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WELL guys, the Pic below is how I "see " the "lockdown" for the support struts, now it is not to scale, just the "way" I can see it working. Now the force taken by the hinge, is at it's greatest, on landing, so .. if the direct line of force is taken by the strut, then lowering the hinge point, will "kick" the hinge point down/ together. Hinge point A is lower than the direct line of force, pushing B & C together (I hope). The hinge point placed behind the actual "knee action" should also assist. The interlocking "dovetail" will /should assist in sideways movement . ????????????? Maybe some "backroom boffins" can help, as I haven't had an answer to my HELP Me Please, on this matter? even if you think it won't work....put fingers to keyboard.............. Thanks Barry
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Looks good to me!
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Looks good to me Barry, being a belt and braces type (also a rather clumsy pilot on landing sometimes) I would over engineer the "pin' and hinge and/or the contact ares of your knee if there is any chance of the male hinge flange cutting or bending the pin, keep her light as possible and I think you have a winner M8.
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Thanks, Eric and Tony R, It seems that you are the only one's that have any idea fof what I am describing, out of 7600 "veiws " nobody else has an input,????????????? NOT even the the "boss" (Tony N).........Barry
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 this is a fascinating thread Barry, probably more advanced modelling than most of us are capable of, hence the lack of replies. I'm assuming that you will build in a degree of overlock on the knee, just a couple of degrees to discourage it from folding under pressure? I must admit, you had me wondering with the sloping dovetail, until I read that the sloping face was not load bearing. As long as the 90 degree mating faces (which will bear the impact loads on landing) are accurate, it looks good. Do you intend to have any form of locking on the main legs in addition to these struts? Looking at the diagrams for the full size unit, the pivot points for the rear legs look as though they use a common hinge pin spanning the full u/c width, possibly with some diagonal bracing into the bargain. IIRC didn't most multi's use diagonal bracing on this component - trying to remember back to all those Airfix kits built as a youngster.
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| Edited: 19/05/08 14:23 |
 The only possible problem I can see is if the hinge has any side to side slop (possibly caused by wear and tear) the center of the dovetail portion may foul on the outer parts of the dovetail thus stopping the knee joint from locking. If in your top diagram the right hand dovetail has the corners removed this would allow it to engage even if it were slightly miss aligned.
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 Hi guys, and congratulations..This is what scale matters should be all about. Sorry, I don't do much after 1918, so, I can't contribute that much ernie PS................love the wee sketches
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Bob C, yes the degree of the knee will be "over centred" , and the rear hinge points will span the whole U/C, Bruce R... The "dovetail" joint will not get "wear and tear", because after it has flown a few times, I am gong to donate it to the RAAF mussem in W.A to be repainted in colours of a Aussie pilot who flew one in that "hugh" battle of WW2 , So it will not go in the "dustbin" . Ernie your cotributions are allways welcome, SOOO...."IS IT A GO????????????. control tower" TA Barry
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| Edited: 20/05/08 12:48 |
Ok, It's been awhile, but now I have the alum. bar to do the "lockdown" hinges, progress will happen. These are the up and lower hinges for the main legs,(practice makes ... better) turned from of 4mm sq. steel bar, 1/8" holes, the longer ones will have2.5mm "set screws" tapped into the lower section, to "lock" in the axle, till next..... Barry
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Back again, just a few shot's of the Overcentre hinge,, took another look at Ken Boyland's diegram's and thought, "well he nad no dovetail " so I have left it out, mind even in a mini lathe, you still require, tiny fingers, good steel rule, vernier's and a bit of enginutity, it's turn out not too bad. THe pic's below show the #1 , #4 will be a lot easier. I thought that if the 2 respecting joints are not = on "lockdown", then I will need to adj. Well, from the longer hinge, thread's the strut, I drilled that right through , so, by before scweing in the strut , a short"set screw can be instered first so as to act as "selected stop point". you can not see it in the pic's yet. until next time Barry
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denotes 
