Puddle Jumper (oz8068)

 

Puddle Jumper (oz8068) by Rob Benson from RC Sportsman 1975 - plan thumbnail

About this Plan

Puddle Jumper Helicopter. Simple profile rubber power helicopter model.

Quote: "For a change of pace and lots of fun, try this interesting project, built from scrap materials. Puddle Jumper, by Rob Benson.

What's a rubber-powered model doing in an all R/C magazine? Well, it was at the WRAMS show in New York that we met 15-year-old Rob Benson and his two original-design helicopters - the Puddle Jumper, presented here and the R-Bee 110 R/C helicopter, that is planned for presentation in a future issue of RCS. This young man's talent and ingenuity was so impressive that we felt his projects deserved recognition.

Actually, the Puddle Jumper will provide more than just 'novel' reading for those who are interested in helicopters but, have yet to build one. Naturally, the same aerodynamic design principles apply and therefore, this project could provide a basic education for those interested.

I can see it all now - a Sunday morning at the local flying site - all the transmitters stowed in the impound area and Puddle Jumpers doing their thing all over the place. Sound far fetched? Just wait and see!

The Puddle Jumper is a cute little helicopter which can be built quickly from scrap materials. However, this machine incorporates all the features of a full-size chopper. It utilizes a shaft-driven main rotor with a Bell stabilizer bar, and a belt-driven tail rotor to oppose torque. Along with the static realism goes fascinating flight performance. The Puddle Jumper will hover smoothly with a constant heading or fly forward for surprising distances. Most flights end with a soft 2-skid touchdown. Since this model demonstrates the same principles as are used on full-size helicopters, much can be learned from observing it in action.

Build the 'PJ' from the ground up. Start by making the two .045 music wire landing gear struts and the balsa LG support plates. The upper plate is grooved to accept the strut wires. Cut with a hacksaw blade and go just deep enough for the wires to drop in and lay flush with the surface of the plate. After this is done, install both wires with the middle bend in the grooves and glue the lower plate on. The grains of the two plates must cross for strength. Put this assembly flat on the table and weigh it while drying.

For the skids, cut a 12 in length of 3/32 aluminum tubing in half. Drill two .045 holes in the top of each skid in the locations shown on the drawing. After the landing gear assembly is dry, insert the strut ends into the holes in the skids and put a dab of 5-minute epoxy at each joint. Set this unit aside for now.

The next area of construction is the fuselage. Cut the two upright pieces and the one front longeron to length. Also cut the upper shaft support block..."

Hi Steve and Mary, Not sure if I sent this cute rubber powered helicopter before. The design is very much like John Burkam's 'Penni' so It should be a good performer. Gene

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Puddle Jumper (oz8068) by Rob Benson from RC Sportsman 1975 - model pic

Datafile:
  • (oz8068)
    Puddle Jumper
    by Rob Benson
    from RC Sportsman
    September 1975 
    13in span
    Rubber F/F
    all formers complete :)
    got article :)
  • Submitted: 20/09/2016
    Filesize: 157KB
    Format: • PDFvector
    Credit*: rchopper56

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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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