Swat oz2859

 

Swat - plan thumbnail image

Swat - completed model photo

This plan was found online 01/05/2012 at: http://www.rcgroups.com/forums/showpost.php?p=21484857&postcount=9672
Outerzone planID: oz2859 | Filesize: 306KB | Format: • PDFbitmap | Credit*: tri-pacer

   

About this Plan

Swat - aka Privy Boy. Free flight power model. For .049 - .051 engines.

Quote: "SWAT! By Don Alberts. They combined the Civy Boy and the Hogan and racked up the highest gas time at the 1955 Nationals. Five years development in this Half A.

Immediately after the 1950 Nationals, when it was evident that the Half A class was becoming a serious competition category, some of the members of the South West Aero Team in Albuquerque decided to design a model of this size incorporating the best features observed at that meet.

Paul Gilliam's Civy Boy (oz5497) design was particularly impressive and the Swat started off having the same dimensions but with altered surface outlines to facilitate construction. During the following five years, the design was flown in contests throughout the Southwest with considerable success. We were also influenced by the Hogan (oz9266) philosophy and the tail-moment arm was shortened and the flat-bottom airfoil was adopted while an effort was made to clean up the external lines of the ship. The fuselage construction has evolved from a built-up truss construction, and corners have been cut everywhere possible in the interest of simplicity and light weight. The temptation to taper the wing tips has been resisted, not due to ignorance of the structural advantages, but to simplify rib cutting and tip construction. The result of this long range improvement program is this lightweight, rugged, high-performance competition machine which put up the highest gas time at the 1955 Nationals.

After building several models which varied only in detail, we reached the conclusion that this could be a boring process and that simplicity and ease of construction were necessary if many planes were to be built, and if good craftsmanship was to be a part of the process. Also the mortality rate for low-incidence models is higher than with the high angular difference or sport


type model. Few experienced competition fliers will deny that the way to get really high is by using as little angular difference as possible and, by using vertical take-off, this has become less dangerous than is generally thought. The engine improvements over the last five years have made necessary changes in the nose-moment arm due to weight and overhang differences, but I prefer the Atwood engines with a micro-tank fuel shut-off system and the plans show the proper dimensions for that system. Various warp resisting wing and stab constructions have been tried during the development period and the one shown on the plan has proven to be best with respect to simplicity and warp resistance both.

The pictures show geodetic wing construction, that is, with ribs crossed over X-fashion to resist warping. Conventional ribs may be easier to build, as shown on the plan. A detail shows how to assemble the geodetic ribs into the wing.

Even if this is your first competition free flight model, no difficulties should arise in the construction. An aluminum template of the wing and stab rib is well worth the time it takes to cut it out and will allow the ribs to be sharply cut and evenly notched. After the ribs have been cut from soft sheet, the right wing half can be built backwards on the plan, since spar locations are already into the ribs..."

Update 05/12/2017: added article, thanks to SimonBlake.

Supplementary files

Article.

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oz2859 datafile

Swat  
by Don Alberts
from Model Airplane News
June 1957 
36in span
Tags: IC F/F Pylon
all formers complete :)
got article :)

 

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User comments

I was rebuilding my SWAT nostalgia gas model and thought I would take a quick look at the article on your website, but you don't have it. So, I dug through my old MAN issues and scanned it in for you [supplementary file]. This is a very popular nostalgia gas model here in North America. People build them in all sizes up to about 800 sq. in. It's interesting reading the article again; his trimming setup is pretty much the way many people trim their modern fixed surface FF gas models. He doesn't say where the CG is, but it should be 100 percent, right on the trailing edge of the wing.
SimonBlake_Toronto - 05/12/2017
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