AMA Cub Cousins

There were several predecessors and many variations of the AMA Cub that have been published over the years.

The Academy of Model Aeronautics has published a series of History Moments, including this one for Week 3 in October, 2011, on the AMA Cub and its cousins:

http://www.modelaircraft.org/museum/hisfacs/factoids_october.aspx

This is a list of references to published articles of models based on the Dart/Cub design.

Dave Linstrum, “The Canardart”, Model Builder, January 1978, pages 64-65,90-91.  This tells how to convert a 16 1/2″ AMA Racer into a pusher canard configuration.  The article neglects to mention that something must be done to stop the prop shaft from turning in the freewheeler when the motor is wound backwards.

Dave Linstrum, “Ultra Dart”, Model Builder, July 1975, pages 51-53, 62, 66.  This is a Thermal Dart enlarged to a 37″ wingspan.

Hobie Steele, “Dart-Too”, Model Aviation, July 1975, pages 43-46.

Bill Hannan, “Hannan’s Hangar”, Model Builder, April 1974, pages 34 and 65.  This is a 39″ span version of the Delta Dart from Russia.

Fred Reese, “Baby Dart”, Model Builder, August 1973, pages 39-40.  This is a 9″ span Dart.

Henry G. Frautschy, “Sorta P-38”, Flying Models, August 2012, page 32-35.  Construction article and plan for a twin boom AMA Cub made from two kits.

 

Notes.

If you are a member of the Academy of Model Aeronautics you can access the digital archive of Model Aviation online.  You can get plans of the Delta Dart and Dart-Too from the AMA Plans Service here:

http://www.modelaircraft.org/plans/plans.aspx

You can get copies of plans, most with articles, published in Model Builder from the publisher, Bill Northrup’s Plan Service, 2019 Doral Court, Henderson, NV 89074, phone (702) 986-2162, 10-4 PT, Mon.-Fri.

You can get all 295 issues of Model Builder magazine on DVD from Roland Friestad, 1640A N. Kellogg St., Galesburg, IL 61401, cardinal.eng (at) grics.net.

You can get Flying Models from the publisher here:

http://www.flying-models.com/

3 thoughts on “AMA Cub Cousins

  1. Actually, I think what Mr. Linstrum forgot is to tell us to turn the prop around. If you do that, you don’t have to worry about the freewheel ramp.

    Thanks for putting up that list. Seems like the AMA Cub’s simplicity ought to lend itself to other hacks. Maybe a joined wing push me pull you design!

    1. If you simply turn the prop around and wind it the way the freewheeler dictates, the prop will pull backwards, it will not push. To make the prop a pusher, it must face in the same direction and turn the same direction as it did when used up front as a tractor. The blade angle and the camber must have the same orientation whether used as a tractor or pusher prop. When you put the right handed tractor prop in back to serve as a pusher, the freewheel ramp will be in front and the bearing will be in back. That will not work. The hub must be modified to put a bearing surface in front and a freewheel ramp in back. Because the motor is now in front and you will be winding while facing the back of the prop, you will be turning it in a counter clockwise direction, the opposite of what you do when winding from in front. An easy way to do this is to drill out the hub and fit some brass or aluminum tube. File a freewheel ramp in the back end of the tube, the end that corresponds to the undercambered surface of the prop.

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