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  1. #1

    Join Date
    Aug 2012
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    Kiefer, OK
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    205

    Redrawing antquated plans, Will need advise from some here

    Hey Gang

    I have started cad work correcting a hand drawn plan from 1964 sold by RCM. The plans are a Cessna T-50 with a 60 inch wingspan (about 1/12 as close as I can so far gather). I have stepped to far off now to quit. I have already started ordering parts for the plane while redrawing the plans to figure out what changes I need to really update them to todays technology.


    The plane is sure enough old school and I want some old school techniques in it, for instance I want to cover it with fabric that has be colored and sealed with dope. The original plan call for no flaps or throttle on the K&B 35 engines. I am going with electric on this puppy. and also put the flaps on it. I will make my own fiberglass parts for it, nacelles and nose cone.

    I am not well experienced with fabric or the methods of stenciling or decals. I mean by what methods you get them made or where. I bought these plans a few years ago and have been trying to learn a little more before I jumped off. I wanted to build it as a loner, but I realize I can't do it by myself, I will need the knowledge of some of you guys here.

    At the time I am drawing the wing ribs etcetera in 2d to get them laser cut, I will also fit it all up in 3d model before I send the DWG memory stick to a cutter. These plans do have a lot of small problems, after I have finished them, is there somewhere I can send the plans to for future use. I mean someone that might keep or sell them. After I do this, I am not interested in making money off it, I want to do it to show me I can. But I'd like the work not to go to waste.

    Although it's early to tell about all the measurements, I can tell some things are drawn out of square and not oval where they should be. I do give consideration and respect to the guys who did draw them at the time. Technology has came so far. What took them hours to draw, not completely right. Technology allows us to do perfectly in minutes.

  2. #2
    Moderator BMatthews's Avatar
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    Oct 2002
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    Well, there's a number of websites that supply free plans for download. They are always interested in new contributions. And update of an old plan to correct some of the pencil wobbles and with a modified structure to make it more suitable for electric power would certainly qualify.

    The plans may not have shown any special consideration for throttle linkages but even back in 1964 the model would most certainly have used throttles.

    Part of the problem with the plans you are working from could be that your paper has shrunk and changed over the years. It doesn't take a dunking in water for that to happen either. Even strong humidity changes can alter some of the cheaper papers over time and produce significant distortion. Or there may simply have been some slippage between the master and the blackline paper when the plans were printed.
    Witty saying to be plagarized shortly.....


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