Tumble Wing (oz9742)
About this Plan
Tumble Wing (Flettner Wing). Control line sport model.
Quote: "This novel control line model gets its lift from a pair of whirling Flettner-type rotors which spin automatically in flight. Easy to build and fly, the model is practically crash-proof because the rotors will keep turning whether the motor is running or not.
Although the model moves along at a fairly good clip in normal flight, it can be made to practically hover on the upwind side of the circle if the nose is raised a bit. Center of gravity location in relationship to the rotor axis is not very critical so a wide variety of small engines may be used without altering the model. It is important, however, to have the control line guide set to allow the model to nose slightly out of the circle, the same as for any ukie.
Construction is of the profile type. Fuselage is cut from medium hard 1/4in sheet balsa. Motor mount is a plywood disk held rigidly in place by blocks cemented on either side. Landing gear may be held either between the plies of the nose disk or simply be set in a groove in the face of the disk and held in place by the rear of the engine tank. Control horn and bellcrank are of the 'Tee' or Firebaby type which are the best for profile fuselages.
A short wing stub fills the center section. A cabane strut on each side acts as a brace. This provides support for the 3/32in wire rotor axle and allows a clear wash-way to the tail surfaces. If you run the rotors right up to the fuselage sides their interference will make elevator control uncertain at low speed.
Construction of the rotors is simple, but should be followed closely for best results. The open center design was chosen after experiment with several types, indicated this design allowed the best forward speed maximums and minimums. It is essential that the rotors be mounted as shown..."
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(oz9742)
Tumble Wing
by Roy Clough
from American Modeler
March 1957
27in span
IC C/L
clean :)
all formers complete :)
got article :) -
Submitted: 21/01/2018
Filesize: 219KB
Format: • PDFbitmap
Credit*: rchopper56
Downloads: 810
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User comments
I used the wing design in a Magnus effect kite and it flew well. I’ll definitely use the wing design in other models now.John Wilson - 26/06/2022
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- Tumble Wing (oz9742)
- Plan File Filesize: 219KB Filename: Tumble_Wing_oz9742.pdf
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Notes
* Credit field
The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.
Scaling
This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.
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