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Post  gcb Thu Dec 13, 2012 9:21 pm

RknRusty wrote:What's a longeron? I've heard the word but don't know what it is.
Longerons and stringers are terms used almost interchangeably. Think "long run" as in the sticks that run along the sides of a fuselage that support the covering. On wings they run spanwise to support the airframe, maintain the airfoil, and support covering.

Of course built-up structures are fragile. Some think planes should be built to fly, not to crash (watch that start a debate).

Using diagonals and gussets properly will enhance the structure considerably. Those have been in use for many, many years on rubber powered ships.

That's my story and I'm stickin' to it. :-)

George
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Post  andrew Thu Dec 13, 2012 10:14 pm

Here's a pic that highlights stringers and longerons. This is a 1/4A plane, not really a good learner for R/C --- planes in the 4 foot span or more are more stable -- but, a good example of a built up fuselage. Notice the heavier wood in the thrust line and along the bottom of the fuselage. The stringers are inplace provide shape and support the covering.

Gussets, that George mentioned, provide one of the best means of adding strength to a stick fuselage with hardly any weight penalty.

BTW, I'm a "build to fly, not crash" guy. You can't put in enough sturcture to keep a plane from re-kitting, but built light enough, you can get a great flyer. There's a fella over at RCU who says, "If you don't fold a wing every once in a while, you're building too heavy." There's a lot to be said for that.

Can framework planes like this endure any punishment? - Page 2 Emerau10
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Post  SuperDave Fri Dec 14, 2012 10:04 am


Of course built-up structures are fragile. Some think planes should be built to fly, not to crash (watch that start a debate).

George[/quote]

Geo:

If crashing is incidental to flying I'm all for crashing. Stuff happens during enjoyable activities. Laughing
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Post  Surfer_kris Fri Dec 14, 2012 10:21 am

Planes that are built light will not stall as easily heavy ones and if you anyway manage to crash, the 1/2a sized ones will barely manage to reach the ground as they stop in the grass above it. I have had my share of dead sticks where I have been to far from the field, you simply land out of sight and go pick up the plane, fuel and take of again.

So there is no compromise to talk about, just build it to fly well and it will never crash. cheers
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Post  gcb Sun Dec 16, 2012 9:10 pm

RknRusty wrote: ...My main goal and purpose is a project I can build meticulously and maybe only fly occasionally. I'm interested in the building experience of a stick plane more than just throwing together another frequent flier. I want the satisfaction of building a complex structure and have it come out not only aesthetically pleasing but airworthy in every respect. In other words I'm testing my building skills with an interesting new medium, and hoping for a pleasing outcome.
Rusty, You might check out Red Rheinhardt's Roger Dodger. Here's some info:

Red’s first published design was the Roger Dodger, in the march 1950 Air Trails. An .049-
powered Stunt model for fun-flying rather than for serious competition, it combined lightweight
construction with the right aerodynamic layout for top performance.
1/2A engines were new at the time, and serious fliers considered them a novelty. With this
design, Red showed that the little engines were capable of full Stunt pattern performance – in the
right aircraft.
The Roger Dodger had a 23-inch wingspan, and the wing’s leading edge and two spars were 1/8
square balsa. Rather than being enclosed in the built-up wing, the bellcrank and lead outs were
positioned below the wing.
Power was an OK Cub .049, which put out very little power by today’s standards. The airplane
was flown on 15-foot thread lines.
Although Rodger Dodger is considered small by today’s fliers, I bet it would be a joy to fly if it
was scaled up and beefed up a bit, and used with today’s .049-.061 power plants.

George
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Post  gcb Sun Dec 16, 2012 9:31 pm

Ran across a scan of the Roger Dodger. I believe the plans are available from AMA.

Can framework planes like this endure any punishment? - Page 2 Rogerd10

George

Forgot to mention...this was the first plane I built from plans. I scaled up the magazine plan one part at a time using the scale shown on the plans. This was mid fifties, no home computers, printers, or copiers. :-)
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Post  RknRusty Mon Dec 17, 2012 11:15 am

Got it. I found it in Model Aviation and bookmarked it. Thanks George.

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Post  jhaye Mon Dec 17, 2012 1:17 pm

Red Reinhardt's most famous plane was the El Diablo for a .35. It's gotta be one of the best Old time stunt plane's that I've ever seen. I alway's loved that plane.

Jim Hayes
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