2 x 4 (oz6544)

 

2 x 4 - plan thumbnail image

About this Plan

2x4 - Radio control sailplane. For 2 channels, with 4 foot wingspan.

Quote: "This superb little sailplane was designed for the newcomer into R/C. Built around a standard radio with standard servos, this 2 channel 49-1/2in span sailplane will amaze you at its flying ability.

I spend a lot of time observing beginners at RC glider flying, helping them where possible and listening to problems they have. Allow me to list a few:

A. The radio I bought won't fit in the model I bought. I spent $70.00 for the radio and $105.00 for the mini -servo and a small battery pack.
B. My model is too weak for the Hi-Start that the guys are using and no one wants to even try it on the winch.
C. My model doesn't respond to commands for 3 or 4 seconds and I'm always over-controlling.
D. I can't fly if the wind is blowing.
E. The MonoKote costs more than the model kit.
F. Every time I land, something breaks.

To my way of thinking, the problems are driving people away from the hobby so it's time to do something about it. Let's call it a primary trainer, a basic element in building - a '2 x 4'.

The 2 stands for 2 channel standard airborne package (my Futaba weighs 10 ounces). The 4 represents the span about 4 feet (49-1/2in). The area is 409 sq in and the prototype weighs 28 ounces. This combination gives a wing loading of 9.8 oz/ sq ft. The moments and aspect ratios were set up along proven free flight criteria for stability and quick response to slight trim changes (minimum throws).

The low aspect ratio wing lends itself to simple but very strong structures so I used standard parts out of a House of Balsa Two-Tee wing. Spruce spars and cedar arrow shafts are the basic elententa of a very strong wing center section. Balsa spars are used in the tips because of the low loads but the arrow shaft is retained for abuse strength.

The single elevator should not raise eyebrows. Its been around since the 1938 Blohm Und Voss BV 141 full size aircraft. Blaine Rawdon used it on his 'Mirage' design an current times. Basically, it simplifies elevator construction, allows flexibility in tail group loyout and helps to dampen the galloping effect novice fliers seem to produce. With the short moments and low flying speed it doesn't produce a roll.

Fuselage cross-section was dictated by radio component sizes. The battery is the biggest item no matter which way you turn it, so width was established. Standard servos and receiver width established depth. It's interesting to note that the on-off switch is longer than the battery is wide. so side mounted space had to be provided in the receiver compartment so that all standard leads would reach their proper destination without extensions.

Fuselage construction is standard lite-ply with balsa aft planking. A balsa crutch is used to eliminate the uneven bowing of sides when they're pulled together. It also provides additional stabilizer gluing area.

The construction photos and captions cover the construction steps so there is no need to duplicate verbage. Lets discuss some very important items that are usually overlooked by both beginners and experts: (1) Glue: I do not use epoxy for construction. The weight penalty to strength attaine4 is poor at best The entire model was built. with Zap. All joints were double glued..."

Scanning by Don at EAC, cleanup by theshadow.

Supplementary file notes

Article pages, text and pics, thanks to the shadow.

Corrections?

Did we get something wrong with these details about this plan (especially the datafile)? That happens sometimes. You can help us fix it.
Add a correction

2 x 4 - completed model photo

Datafile:
  • (oz6544)
    2 x 4
    by Gene Wallock
    from RCMplans (ref:889)
    May 1983 
    50in span
    Tags: Glider R/C
    all formers complete :)
    got article :)
  • Submitted: 08/04/2015
    Filesize: 573KB
    Format: • PDFbitmap
    Credit*: Balsaworkbench, theshadow

003.jpg
003.jpg
004.jpg
004.jpg
005.jpg
005.jpg
006.jpg
006.jpg
007.jpg
007.jpg

Do you have a photo you'd like to submit for this page? Then email admin@outerzone.co.uk

User comments

Hello, Outerzone people! My name is Wagner Aoki. I am from Brazil, Sao Jose dos Campos city. I would like to thank you for the site. I had downloaded a 2x4 glider plan. I finished the construction and I would like to share some construction pictures [more pics 003-007]. The maiden flight video: https://www.youtube.com/watch?v=XfW1-sbHqfs. Thank you so much.
Wagner_Aoki - 09/02/2018
Add a comment

 

 
 

Download File(s):
 

Notes

* 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.

 

Terms of Use

© Outerzone, 2011-2019.

All content is free to download for personal use.

For non-personal use and/or publication: plans, photos, excerpts, links etc may be used, provided that full and clear credit is given to Outerzone with appropriate and specific direction to the original content i.e. a direct hyperlink back to the Outerzone source page.

Unauthorized use and/or duplication of this material without express and written permission from this site's owner is strictly prohibited. If we discover that content is being stolen, we will consider filing a formal DMCA notice.