Jeckyll and Hyde (oz12221)

 

Jeckyll and Hyde (oz12221) by P Gasson from Aeromodeller 1954 - plan thumbnail

About this Plan

Jeckyll and Hyde. Dual purpose design, both rubber and glider, using two different fuselages.

Note plan shows ribs and formers at full size, the main layout is at 1/4 scale.

Quote: "Dr Jeckyll & Mr Hyde. A dual purpose design by P Gasson.

A MODEL is taken out of its box on the flying field and the owner considers whether to power it with rubber or use a tow-line. How is it done? Magic? Not quite, for it is really two models in one. Has it ever occurred to you why we should not use the same wings and tailplane for both rubber models and gliders?

The dual-purpose model has its advantages apart from the fascination it will have for the theoretically-minded modeller. It is a model which could be flown in both rubber and glider contests, which might appeal to the younger modeller who is short of cash, or even to the contest flier who wants to save the time of building two complete models.

Design Difficulties: Here are some of the design difficulties which had to be ironed out before the model could be put on to the drawing board. Three hundred square inches is about the largest size popularised for a rubber job, so this limit has not been exceeded. The modern trend is towards gliders of at least 300 square inches, so this is used as the basis for all further proportions for both models.

The result is a big rubber model and a relatively small glider. The fuselages have been designed to place the wings and tail (the two lifting components) in the same relative positions, thereby using as near as possible the same incidence and gliding speeds. When the wings and tail are put on the glider fuse, the nose is ballasted to bring the e.g. to the right position and make up for the weight of the motor in the rubber model fuselage.

Glider First: It is best to trim the glider first as faults should be more readily evident. After hand-gliding, final adjustments can be completed from tow-launching. The reason for trimming the glider first is safety. There is no control if a fault appears when a rubber model is going up on the climb.

Since this design is likely to attract a number of beginners, the following notes have been compiled to help with its construction. It is unnecessary to draw a full-size plan of all the components, as all but the rubber model fuselage can be assembled merely by scaling up dimensions. It is advisable to draw the rubber model fuselage otherwise it will be difficult to get the right shape and rib spacing.

Notes for the Novice:

WING: (1) Assemble ribs to leading and trailing edges, except at the dihedral breaks. (2) Add all remaining spars and sand thoroughly. (3) Crack dihedral joints and set at correct angle by adding ply dihedral keepers (see plan). (4) Cover with light-weight Modelspan and dope.

RUBBER MODEL FUSELAGE: (1) Build the two sides, one on top of the other. (2) Remove sides from building board and add spacers and pylon, etc. (3) Sand and cover with lightweight Modelspan.

GLIDER FUSELAGE: (1) Draw shape on balsa sheet to scaled up sizes, cut sides and add formers. (2) Cover in top and bottom after fixing tow hook and wing-fixing dowels. (3) Add nose block, sand it thoroughly and cover the whole fuselage with Modelspan.

PROPELLER: (1) Cut blank to sizes given and carve in usual way starting with the under-surface and finishing with the top. (2) Carve nose-block and add bush. (3) Bend and solder prop shaft. (4) Assemble shaft with nose-block and add stop. Note: If single-blade prop is required, one blade only is carved and is balanced by a counterweight as shown on the plan. (5) Rubber motor-14 Strands 1/4 x 1/24 in, 50 in long."

see https://www.rcgroups.com/forums/showpost.php?p=19259158&postcount=5779

Quote: "Hello Steve, I recently searched out a very interesting, to me, vintage rubber duration model to build in the future. It is called the Jekyll and Hyde from the 1954 July AeroModeller magazine I believe. Perhaps it would be a good addition to your collection of plans. The plan seems to be just sitting in the big vintage plan thread on RC Groups. That is where I got it. It's in quarter scale, so the framework needs to be scaled up manually, but ribs are full size. I've included an attachment of it so you can see it. This is what I'm going to use to make it. I thoroughly enjoy your site,"

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Jeckyll and Hyde (oz12221) by P Gasson from Aeromodeller 1954 - model pic

Datafile:

Jeckyll and Hyde (oz12221) by P Gasson from Aeromodeller 1954 - pic 003.jpg
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Jeckyll and Hyde (oz12221) by P Gasson from Aeromodeller 1954 - pic 004.jpg
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Jeckyll and Hyde (oz12221) by P Gasson from Aeromodeller 1954 - pic 005.jpg
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User comments

I've had a lot of success with Jeckyll & Hyde rubber model over the past 20 years. Built to the plan it's a very good contest flier. I have two of them.
Howard Gostelow - 26/06/2020
Herewith pic of Jeckyll & Hyde [main pic] (Malcolm Campbell pic).
Howard Gostelow - 26/06/2020
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* 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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