Small Small Fry (oz13405)

 

Small Small Fry (oz13405) by Ron Prentice from Aeromodeller 1985 - plan thumbnail

About this Plan

Small Small Fry. Control line sport model, for CO2 power.

Direct submission to Outerzone.

Quote: "Small Small Fry. Build this miniature CO2 Control Line Stunter by Ron Prentice.

THE ORIGINAL 'Small Fry', which I designed in 1948, was powered by a Mills 1.3 diesel. It won the stunt control line competition at the 1948 All Herts Rally, proving that small diesels could hold their own against the large American motors.

The design was typical of the box type, lightweight stunt model popularised by the West Essex Club in the late 40's. It was an extremely popular model and was built in numerous sizes by those wishing to learn to stunt on a low powered and inexpensive model.

Having recently made a replica of the original model, I rediscovered the fun and thrills of flying stunt control line with such a model. This prompted me to build the Small Small Fry for CO2 powered indoor flying which is the subject of this article.

Fuselage: Choose medium 1/16 square for the framework, build one side over the other in the usual way. Cut the wing and tailplane mounts from soft 1/32 sheet and glue into place. When dry, separate the two sides and insert formers F1, 2 & 3, followed by the crosspieces. Drill former F3 as shown for the 20 swg wire bellcrank pivot. Make the bellcrank from 1/16 ply and epoxy a short length of 20 swg alum tube as a bush on the pivot point. Insert the plate into position and push through the pivot wire. When in place, fix permanently with a little epoxy. Glue in the two 1/16 sheet CO2 tank supports as shown.

Tailsurfaces: These are built from medium soft 1/16 sq Balsa, with a central section of 1/16 sheet. The two sections of the tailsurfaces are hinged with fine cotton, sewn as shown. The control horn is cut from 1/16 ply and slotted into the elevator. Glue the tailsurfaces into place after they and the fuselage have been covered.

Wing: Cut the wing ribs from soft 1/32 sheet. Use medium hard 1/16 sq for the leading edge and the mainspars. The trailing edge is shaped to a triangular section from a piece of soft 1/8 x 1/2 in before assembling wing. Start by attaching ribs to mainspars, then follow with leading and trailing edges, packing up t.e. with suitable bits of waste balsa. The centre section is covered with 1/32 in sheet top and bottom. Cement in the 1/32 in ply line guide as shown and add the wing tips.

Covering and Assembly: Insert the 20 swg push rod into position and solder a small washer at each end so that it doesn't come off. Cover the fuselage and fin with light Jap tissue, lightly spray with water and allow to dry, pinning the fin down to avoid warping. Cover the wing and tailsurfaces with indoor condenser tissue if available or if not, light Jap will do. Lightly spray wing with water and pin down to dry. Do not spray the tailsurfaces. When all are dry apply one coat of 25% Dope / 75% Thinners to all surfaces except the tail.

Fit the 24 swg leadout wires onto the bellcrank and extend out through the wire guides, terminating with line clips or loops.

Remove the tissue from the under sheeted section of wing where it touches the wing mounts and cement the wing into position. Cement tailsurfaces and fin into position.

Mount the Telco motor onto the ply former with self tapping screws. Push the CO2 tank into the mounting holes provided, shortening the copper pipe if desired.

My model flew well on 15 ft lines which were made of 8lb Nylon fishing line. I used a 6 in Peck Polymer propeller which is both more efficient and lighter than the standard Telco prop.

To anyone used to flying control line models, it will take a little time to get used to the complete absence of 'pull' when flying the Small Small Fry. Adjust the throttle to provide just enough power to fly the model well, consistent with the longest motor run possible on liquid charge."

Supplementary file notes

Article.

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Small Small Fry (oz13405) by Ron Prentice from Aeromodeller 1985 - model pic

Datafile:
  • (oz13405)
    Small Small Fry
    by Ron Prentice
    from Aeromodeller
    February 1985 
    18in span
    CO2 C/L
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 21/10/2021
    Filesize: 190KB
    Format: • PDFbitmap
    Credit*: hjsaxe

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