Batiri (oz7807)

 

Batiri (oz7807) by J Manuel Tellez from Air Trails 1952 - plan thumbnail

About this Plan

Batiri. Free flight power model.

Mexican model by J Manuel Tellez. Thanks to Pit for confirmation on this one.

Quote: "South of the Border Soarer. From down Mexico way comes this 'engineered' Half-A free flight; original version won 1st at Tangerine Meet. Batiri by J Manuel Tellez.

When I first seriously considered designing a F/F model that would stand a chance in a large US contest, I came to the conclusion that it would need a skyrocket climb and a slow soaring glide. As we all know, these characteristics are based on contradictory design principles. Every model designer is torn between the two, trying to reach a satisfactory compromise. I began to wonder if there was a way of changing either principle from the usual standards without sacrificing one or the other. After some thought I believe I succeeded in changing both and in incorporating these changes in Batiri.

My first aim was to gain maximum altitude during the powered part of the flight. This depended on two factors, the flight path and the speed. The model would gain the most altitude by traveling along a completely vertical flight path at the greatest possible velocity. I first concentrated on obtaining the maximum possible vertical speed and soon realized that it depended mainly on a relationship between power and weight. This can be more clearly understood by studying several mathematical formulas involving power, and starting with the one which defines it: P = (W x H)/T, where: W = weight in pounds; H = T height in feet; T = time in minutes.

In other words, power is equal to foot-pounds per minute. Since one horsepower is equal to 33,000 foot-pounds per minute, we can get horsepower from the previous formula by dividing by 33,000. The formula then becomes: HP = (W x H)/33000 T.

Since vertical speed is equal to vertical distance or height divided by time, the formula becomes..."

Direct submission to Outerzone.

Update 28/03/2019: Added article, thanks to RFJ.

Supplementary file notes

Article.

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Batiri (oz7807) by J Manuel Tellez from Air Trails 1952 - model pic

Datafile:
  • (oz7807)
    Batiri
    by J Manuel Tellez
    from Air Trails
    February 1952 
    32in span
    IC F/F Pylon
    all formers complete :)
    got article :)
  • Submitted: 11/06/2016
    Filesize: 509KB
    Format: • PDFbitmap
    Credit*: dfritzke

Batiri (oz7807) by J Manuel Tellez from Air Trails 1952 - pic 003.jpg
003.jpg

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User comments

Hi Steve. Batiri was designed by J. Manuel Tellez of Mexico. There is some info on the Volar Libremente site but the article appears to be in Spanish: aeromodelismovolarlibremente.blogspot.co.uk
BobP - 25/06/2016
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