Tufnut (oz938)

 

Tufnut (oz938) by P Chinn from Model Airplane News 1956 - plan thumbnail

About this Plan

TuffNut. Simple profile rubber-powered model.

Quote: "Full-size plans in magazine, detailed step-by-step construction notes, make a delightful little rubber job for sport.

There is a tendency for designers and manufacturers to over-emphasize performance. For high performance, a high power-to-weight ratio is needed and that means a light and relatively flimsy model. A flimsy model not only breaks when it hits something; it is difficult to keep in shape when you cover it, through the lack of rigidity in the framework. Moreover, such a model doesn't even have to crash to get broken: it can all too easily be accidentally damaged in handling. All this means that our 'high performance" model will probably never get into the air, or if it does it will never get a chance to perform as the designer intended. Besides, long flights really aren't necessary. You will be surprised to see how long even a 20 or 30 second flight really is and how thrilling it can be.

So, bearing all these points in mind, we set about trying to provide a model design and construction feature that would give the beginner a better chance of success. Tufnut is the result.

At first, we had intended to make it a traditional 'stick' model. We chose, instead, the profile-fuselage type for three reasons: it is stronger, it rules out the need for making a special metal propeller bracket and it looks more attractive.

To answer our second requirement, we have made the plans as easy to understand as possible and supplemented them with a series of photographs, taken during the construction of the original model, to show the various stages in its assembly. These pictures are referred to in the detailed instruction which we shall come to in a moment.

In answer to our third point, Tufnut really is tough. We gave the original model to two young friends of ours who immediately flew it into the side of a shed and then crashed it several times in quick succession because of their inexperience, but it came through with no damage. The solid 1/4 in sheet balsa fuselage is stronger than one of built-up strip balsa and tissue. The tail unit is simply cut from 1/32 in. sheet, which is quite strong enough, and this, and the various fittings, such as landing gear and prop assembly, are fixed with a minimum of trouble.

For utmost ease of construction, the wing, like the tail, could have been made of sheet balsa, but such over-simplification does little to prepare the beginner for bigger and better projects and so we have provided an efficient double-surfaced, built-up wing which is of sufficiently heavy construction to simplify covering and resist damage in a crash. The ready-made wheels may be of hardwood plastic, either of which can be obtained from your local model dealer. You can use a ready-made prop, too. We used a 7 in Kaysun plastic prop supplied by America's Hobby Center. For longer flights, you can use an 8 in saw-cut balsa prop, if you don't mind a little extra work finishing it off. Before you attempt to start construction, take a good look at the full size plan printed here and study all the photos.

We would also recommend that you read through the rest of this article so that you are quite sure that you understand everything in advance. In this way you will eliminate the likelihood of making as mistake and having to rebuild any parts. The first thing to do is to cut out the various sheet balsa parts..."

Supplementary file notes

Planfile includes article pages.

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Tufnut (oz938) by P Chinn from Model Airplane News 1956 - model pic

Datafile:

Tufnut (oz938) by P Chinn from Model Airplane News 1956 - pic 003.jpg
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Tufnut (oz938) by P Chinn from Model Airplane News 1956 - pic 004.jpg
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Tufnut (oz938) by P Chinn from Model Airplane News 1956 - pic 005.jpg
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Tufnut (oz938) by P Chinn from Model Airplane News 1956 - pic 006.jpg
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Tufnut (oz938) by P Chinn from Model Airplane News 1956 - pic 007.jpg
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Tufnut (oz938) by P Chinn from Model Airplane News 1956 - pic 008.jpg
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User comments

I'd like to share some pictures of my rubber powered Tufnut which I built from scratch with the plan I found on Outerzone [more pics 003-006]. It was a nice winter project and I hope that my kid and I will have much fun during the summer!
BerndtB - 30/04/2018
I've had the plan from the original magazine since dad brought it home (well, actually a few years before my time). Feeling nostalgic for those early years and remembering that dad had built one, I did one recently. Staying true to the plan was my goal, but PGF Chinn hadn't designed such a convenient fuselage for stretch winding. So after a couple outings with short flights and awkward hand winding, I took some design tips from Jean Andrews and his Flakey from Jr. American Modeler, and built a sheet fuselage with removable nose for stretch winding. I also put a single wheel up front. Test flights at the local park look promising. I've attached a photo of each version for you [more pics 007-008].
TimothyLarson - 18/06/2019
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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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