RCU Review: Balancing Upside Down!


More On This Product

  • Research Airplanes
  • Research Boats
  • Research Cars
  • Research Helicopters
  • Research Engines & Motors
  • Research Radio Equipment
  •  
     
    Contributed by: Mike Buzzeo | Published: November 2005 | Views: 40725 | email icon Email this Article | PDFpdf icon

    "How To" Article by Mike Buzzeo (MinnFlyer) Email Me

    It seems that lately we have been getting a lot of questions asking if it is correct to balance a low wing plane upside-down. The simple answer to this is "Yes", but a more accurate answer would be "Usually, but not necessarily always". Once you understand the basic principle, you'll easily see why.

    Imagine that the image below is a wooden plank with two Pegs in it (One Red and one Green). If you were going to lift the plank by the Pegs, would you lift it from Peg "A" or "B"?


    The obvious answer is to lift it from Peg "A", because if you tried to lift it from Peg "B" it would probably rotate 180 degrees due to the fact that all of the weight is above the pivot point.

    Now, let's change the shape of those pegs to an airfoil shape. It's easy to see that the same rule applies. So in this case, you would still balance it by lifting at Peg "A" (Fig 1).

    But now, let's suppose that you decided to flip the plank upside down (Fig 2). In this case, you would now balance it from Peg "B" since the majority of the weight is below it.


    The next obvious conclusion that can be drawn is that in either case, the lower peg is not needed.


    Now if we just modify the graphics a bit, you can see why it is easier to balance a Low-Wing Plane Upside Down.


    Now let's look at when you CAN balance a Low-Wing Plane Right-Side-Up

    Now that you understand that it is easier to balance a plane when the Center Of Weight is below the point from which you are balancing it, you should be able to see that if a Low-Wing Plane has enough Dihedral, the Center Of Weight will be BELOW the wingtips. Therefore, on some models you CAN balance the plane Right-Side-Up if you balance at the Wingtips instead of next to the Fuselage.


    So the next time you're not sure which way is "Up", just think about these Illustrations. Good Luck!

    Comments on RCU Review: Balancing Upside Down!

    Posted by: koolkrabber47 on 11/19/2009
    that was a great example....it was very easy to understand.....can you please post a "how to" on lateral balaning???....side to side balancing, especially for a mid-wing 3d plane???....koolkrabber47....
    Posted by: MinnFlyer on 11/19/2009
    Already did: http://www.rcuniverse.com/magazine/article_display.cfm?article_id=84
    Page: 1

    EMAIL THIS ARTICLE OR CHECK OUT THESE OTHER GREAT REVIEWS!
     
    PhotoManufacturerProductSummaryReviewed
    Tower HobbiesJ-3 CubWith its distinctive looks, it is probably safe to say that the J-3 Cub is one of the most recognized and known airplanes in ...11/23/2015
    RCGF21cc Twin Cylinder Gasoline EngineRCGF, a Chinese manufacturer of gasoline engines, designs and manufactures engines specifically for 'the RC aircraft market. ...11/23/2015
    RCGF120cc Twin Cylinder Gasoline EngineRCGF, a Chinese manufacturer of gasoline engines, designs and manufactures engines specifically for the RC aircraft market. T...11/23/2015
    Seagull ModelsMaule Super Rocket 10-15cc ARFWhen Seagull Models announced that they were going to produce not just a model, but an ARF of the Super Rocket, I just had to...11/22/2015
    HobbicoEstes Proto-ZThe Proto-Z is a Blast of micro-sized fun! It's the ultimate user-friendly drone- The fastest, easiset and most economical wa...11/22/2015
    FliteworkEdge 540The Flitework Edge 540 is an electric only ARF airframe with a generous wing span of 66.9" and also beautifully dressed up in...11/21/2015
    Seagull ModelsSteen Super Skybolt 15cc ARFSeagull Models introduced this biplane early on in 2015, and SIG mfg. had a pre-production sample at the Toledo Expo. That pr...11/20/2015
    ST ModelSaltoST model brings us a fun aerobatic glider with the H101 Salto. The self-launch electric glider has no bad tendency and will b...11/19/2015
    RCGF10cc Gasoline EngineRCGF, a Chinese manufacturer of gasoline engines, designs and manufactures engines specifically for 'the RC aircraft market. ...11/17/2015
    Seagull ModelsFunky Cub 10-15cc ARFThe new Funky Cub has some really cool attributes, borrowed from scale aircraft, that should add up to make it a great flying...11/16/2015
    RCGF20cc Gasoline EngineRCGF, a Chinese manufacturer of gasoline engines, designs and manufactures engines specifically for 'the RC aircraft market. ...11/15/2015
    ST ModelASW28ST Model chose to reproduce the Schleicher ASW28, a single seater standard class glider capable of glide ratio up to 45. The ...11/10/2015
    The World Models30% PT-17 Stearman ARF (U.S. ARMY) Some may call me lucky. I would agree! One of the reasons that the PT-17 is so close to my heart is that I have a personal co...10/03/2015
    Bomberfield USA 201527th Annual B-17 GatheringEvery year, the end of the summer brings the big birds back to Monaville, TX, for a festive fly-in weekend at the local RC si...10/03/2015
    HeliMaxVoltage 500 3DThis quad is absolutely not for the faint of heart, but if you·re an established heli pilot with some experience under your b...10/03/2015
     

      Return to Magazine Homepage






     
    RCUniverse is a service of Internet Brands, Inc. Copyright © 2001-2016.  Privacy Policy
     
    GET FREE RC CONTENT FOR YOUR WEBSITE

    Search | Marketplace | Event Central | Local Clubs | Magazine | Product Ratings | New Products | Discussion Forums

    Photo Gallery | Instructor Search | Field|Track|Marina Search | RCU Youtube Channel | | RCU Twitter!

    Member Locator | Advertisers | Hobby Vendor Resources | Rate Manufacturers | Sign In/Sign Up

    Products Videos WattFlyer.com RC Classifieds

    RCU4 | 54.167.102.69 | 0 | 1 | 03:47:01 PM EST | NC