Ellipse 2a (oz13811)
About this Plan
Ellipse 2a. Radio control sport model. Wingspan 33-1/2 in (850mm), for 1 cc diesel engine and 2 channels.
Direct submission to Outerzone.
Quote: "Hi Steve and Mary, Here is another plan to add to my collection. Ellipse 2a, perhaps a not very imaginative name, but it was designed before my Ellipse 3 (oz13543).
At the time I decided it was a little too large for my intended SAM 75 engine, so I went ahead and designed the Ellipse 3. The Ellipse 3 flew so well I decided the low-wing Ellipse 2 had to be built.
However I had found the washout a bit fiddly to achieve on the "3" so I redesigned the wing of "2" to make it self-jigging, hence the "2a".
So here it is, somewhat overpowered by a very nice Schlosser 1.0 diesel. On a 7x4 it flew like a little pylon racer but an 8x3 has tamed it to be very pleasant indeed. Loops, rudder rolls, barrel rolls - all lots of fun. It even takes off from the ground, staying nice and straight - and glides in to smooth landings, that washout must be working!
33 1/2" apan (850 mm)
2 channel (rudder/elevator)
approx 1.0 cc diesel.
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User commentsI think it needs ailerons.
Doug Smith - 08/05/2022
No, ailerons would definitely spoil this one. It rolls very well on rudder alone. Ailerons would give more axial rolls but would lose the charm, becoming just another sport plane.
Warren Brown - 08/05/2022
Dave Robelen designed a few low-wing RC models with just RE controls, I mean no ailerons. The Pronto and the Playboy, weren't they very successful?
SteveWMD - 09/05/2022
Perhaps I should expand a bit. I have nothing against ailerons, in fact most of my designs use them (Wasp, Rookie, Fugly Stick) but I find just rudder/elevator designs a refreshing change and they fly so sweetly (if you have enough dihedral).
The way I do it is to plug the rudder into the aileron channel so I don't have to re-learn how to fly. For the same reason I mix rudder into aileron so the rudder works normally for take off. Easy!
...and you will amaze your clubmates (at least the younger ones) doing rolls without ailerons.
Warren Brown - 09/05/2022
Anyone see a Vic Stanzel "Shark" in this one?
scotprin - 09/05/2022
Yes I understand. Yesterday I amazed an aerobatics instructor by doing rolls with my (no ailerons) Dollar Tree Guppy.
Doug Smith - 09/05/2022
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