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Corsair Foamy Project

Discussion in '* Scratch Built Section *' started by USXPAT, Mar 30, 2009.

  1. USXPAT

    USXPAT New Member

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    Hi guys, this is my first post. I stumbled apon this site cuz I'm a CNC guy and became facinated by what you are doing. I have never built or flown an RC plane. So I decided to design one. I'm really getting into SketchUp, not a bad package ;) I'm looking for some feedback on this design. Most importantly I was not shure what the "over all size" should be for a Foamy. If you guys can offer basic parameters, ie Wing Span ect. I'll draw up some nice War Birds for the PhlatBoyz community. The Corsair I started here was drawn from Scale Plans. I felt it nessary to strech the Tail and increase the size of the stabilisers by %10. This may still be too small. Let me know what you think! It would be really cool to see one of you build this plane.

    Attached files 3D Foamy Corsair.skp (990.5 KB)Â
     
  2. Flashsolutions

    Flashsolutions Active Member

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    Wingspan is typically in the range of 35". You will need to get the free phlatscript plugin to mark up the cut paths.

    For example, your rudder needs to be separated from the fuse in order to apply the cut path.

    Fold lines such as the corsair has, is done with a "fold" edge option in phlatscript.

    Resizing a plane is a very simple step.. use the tape measure tool, measure a group item such as a wing and type in a new value in the text box. Enter asks you if you want to resize the entire model... whala! magic, its a new size.

    Lots of tutorials on this forum. It's a hoot man! I'll try to find some time to cut some out, but I have about 3 in the queue at the moment.
     
  3. USXPAT

    USXPAT New Member

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    Thanks Flashsolutions! I totally get the breakout and cut paths. One thing I noticed.. When I drew the wing I envisioned it as cut from a single part. if the curff is 1/8" and depth at %50 (also 1/8") theorectically you can't fold the wing to 44deg WO binding the curff. Is this a problem? or is there enuff leway with foam? Also is there any standard for engine mounts, or should that be left to the individual? I'll make changes and post them.
     
  4. Flashsolutions

    Flashsolutions Active Member

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    The fold tool allows us to cut say a 50% depth and then the foam can fold at that crease.

    Some guys are making full fuse models such as circular fuse with fold lines spaced appropriately.

    No standard I know of on mounts. I usually cut engine mounts in 1/16" lite ply.

    Most of us cut 1/4" FFF or 6mm Depron for our planes. I have used 3/4" foam for fuse in some of my planes.
     
  5. USXPAT

    USXPAT New Member

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    Hi Flashsolutions, I'm the guy working on the Corsair Fomie. I appreaciate your timely and thoughtful respones to my newbie questions. I shure could have picked a simpler desing to that of the Corsair. Oh well, this just forces me up a steeper learning curve with SU. I'm dedicated to my goal: designing a decently "scale" Fomie Corsair, that flys well. I followed your advice to shoot for the 35" wingspan. What has come out sofar is closer to 34". I found out some very strange things happen to the geometry of a "gull" wing. I took the trouble of building some small (9" wsp) gliders to check fundamentals of design. It seems to me the wing can't be correctly constructed on a "square" to view plan form. What I mean is, if you look at the wing, say from the LE it looks squewd. At first I thought that this was just due to the way images distort in a parellel view. So I built the model. Same thing, I'm not a geometry guy, but it looks like the outer wings have a negitive angle of attack, by a lot. So in my latest version, the outer wings are joined at a 3deg sweep from the root wings. This seems to "look" right. It just troubles me that there is somthing going on here I just don't understand. Secondly, This design is based around 1/4" Foam. The 6mm guys don't like the sloppy big cuts. How say you? Thirdly: The whole problem of creating a good spar for this wing is a challenge. I have a proposal to pass on to you. What if I used piano wire formed to the angles of the inner wings, followed by the angles of the outer wings. Extensions of carbon tubes could be slipped on the ends. This would allso allow for a good place to mount Landing Gear. One More Thing: What size prop do you see on this? That will give me ground clearance specs for the LG

    Attached files LG Study.skp (37.1 KB)Â
     
  6. tvcasualty

    tvcasualty New Member

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    Hey for a good idea on 2d profile planes check out: http://www.rabidmodels.com/customergallery/index.php of rabid models, that guy makes some great looking planes that are simple, yet make a nice looking flyer. Those are really fine kits for the getting started DIYer, and similar models could be cranked out with the pp. I think it'd be neat if that guy were to sell some of his cnc work over here.

    If you want something more scale, check out my F4U here: viewtopic.php?f=73&t=118

    I would really be into some WWI dog fighters similar to the rabid models in design, but really, I lack the light weight Lipo battery packs to make them quite as effectively and a good indoor arena...
     
  7. USXPAT

    USXPAT New Member

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    tvcasualty, Thank you for your post. After reading and checking out your stuff, I must bow to the master. I started this build before I found you guys. So, rather than recreate the wheel, I have decided to offer a simpler design that will appeal to standoff scale Sport Flyers. Man, tvcasualty, have I learned.. The wing of the Corsiar is a monkey puzzle! It's not done yet but it's comming. I'll have a nice easy to build plane that we can share.

    USXPAT
     
  8. Anonymous

    Anonymous New Member

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    USXPAT, don't be intimidated by tvcasualty's outstanding SketchUp skills. I'm not sure if anybody else here compares to him and I KNOW my work wouldn't hold a candle to his phenomenal models. Just do what you can and post whatever you wish with PRIDE - you've tackled a project that would scare my grey hairs back to brown! :D (And there are a lot of those grey ones.)
     
  9. tvcasualty

    tvcasualty New Member

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    Indeed, I merely post so that others can learn, and it appears that at least janbjorn
    is doing a fine job with that. Nothing wrong at all with another method to the madness. -Now speaking of gray hairs, if anyone has a wire bending CNC machine I've love to get a hold of that right now, the LG on my Fokker are kicking my butt!
     
  10. USXPAT

    USXPAT New Member

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    Guys, I started school again a couple of weeks ago. I've been super busy and had to stop this project for i while. But I will continue as time allows! :)
     

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