Porterfield Collegiate - 41in FF Scale .049, 1940 lightplane, Gene Salvay, Oct 1969 MAN.
Quote: - "The prototype model and text herein was constructed and written by Mr. Salvay and the model plan was created by Mr. Imrisek. The model has been constructed reasonable to scale and is about 1/10 size. A Clark Y airfoil was used in place of the M-6 and the horizontal tail was slightly enlarged. Several interesting model building features are incorporated into the design of the Porter-field which should result in a stronger, simpler and more properly aligned framework. These will be found in the construction features of the wing and empennage. They relate mostly to the knock-off wing panels and the tips of the wing and empennage. This writer has always used silk to cover his models and trying to hold the surfaces flat after five or six coats of dope has always presented a problem. I believe the laminated tip has offered a solution to the problem, as shown on the plans. The plug-on wings are also an obvious necessity tf sustained flying of the model is to be had over many months of activity.
In the interest of simplicity, the adjustable horizontal tail has not been included, although this was a feature of my previous Rearwin and Lockheed models featured in 1966 and 1967 MAN issues. Although warping tails to achieve proper power-on and power-off trim is done by most builders, it is not a sure fix as different temperatures and humidities can result in some pretty wild flights. However, as stated, in the interest of simplicity a fixed horizontal is used. "
Update 3/1/2016: added article, thanks to RFJ.
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