Arrowhead 3 (oz14077)

 

Arrowhead 3 (oz14077) by Bill Siegel 1961 - plan thumbnail

About this Plan

Arrowhead 3. Control line stunt model. For Cox Tee-Dee .010 engine.

Note this plan shows three variants of the same design. Wingspans vary between 10 and 8 in.

Quote: "Three variations of a single plane that offer the complete stunt range from the trainer through the full pattern. Arrowhead-3, by Bill Siegel .

Designed to fly in auditoriums, backyards, and large closets, the 3 Arrowheads presented are completely stunt-able, easily portable, highly indestructible, and very eco-nomical. (Also, they VTO).

The basic design evolved 'down' from a 16 inch .049 job, that had been well tried and proven. Scaled down to 10 inches, and powered with an .010, we have our layout #1, stabilizer directly coupled and hinged to wing trailing edge. This ship is very sensitive, will do most every stunt in the book„ and literally flips. It is perfect for indoor flying on 8 to 15 ft lines; however, on 15 ft lines outdoors, it will start to gallop, especially in gusty weather. After some thought, the #2 modification was built with an eye toward outdoor work.

On this 'pipsqueak' the span was shortened to 8 inches and the chord increased to 4 in for a more stable configuration. The stabilizer was used to get cleaner action and increase the tail moment. My expectations proved correct, and this ship, while more docile than # 1, is just the ticket for the average backyardAndoors or out, it does loops and figure-8's much more gracefully than # 1, and is more suitable for beginners.

Number 3 was built after Ken Sherman suggested that I go 'whole hog' and use Arrowheads a la Arrowheads (Arrowhead tail blooms) and center the stabilator. To compensate for the increased tail weight, I lengthened the nose section to bring my motor farther forward. This proved to be a flight bonus, as the longer nose and tail moment arms gave beautiful response, with no tumbling on short lines or galloping on long ones. The extra side area was compensated for by additional offset. This version has proved to be the best for long line (15 to 20 ft) outdoor flying. So you takes your pick:

#1 for indoor, short line flying.
#2 for outdoor, short line flying.
#3 for outdoor, long line flying.

Now let us sit down for an evening's work: Cut ribs, leading edge, and trailing edge, from soft stock. When selecting wood, keep in mind that the indoor version should weigh no more than one ounce, ready to ffy. On the outdoor version, you can run up to an ounce and a half. Assemble and glue wing; being sure to keep entire unit square. When this is dry, add bell crank mount, bell crank, lead outs, push rod, and tip weight..."

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Arrowhead 3 (oz14077) by Bill Siegel 1961 - model pic

Datafile:
  • (oz14077)
    Arrowhead 3
    by Bill Siegel
    from Model Airplane News
    July 1961 
    10in span
    IC C/L
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 15/09/2022
    Filesize: 744KB
    Format: • PDFbitmap
    Credit*: theshadow
    Downloads: 282

Arrowhead 3 (oz14077) by Bill Siegel 1961 - pic 003.jpg
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User comments

I loved the Cox 010 engine, came out about the same time as this airplane. I spent a big portion of my paper route money on one in 1962, real expensive at $7.95. And the fuel was high too, Cox red can ran best. Only props available were the black plastic ones furnished by Cox, 3" diameter. The tiny Cox had a lot more power than I thought and about the same as a PeeWee but it ran better. later, I was able to power a 48" wingspan Nomad glider with the 010, built light and covered with tissue and clear dope, controlled by one of the then new all transistor receivers, most reliable model on the field. If you want a good 010 now, you'll have to shell out more than $100, if you can find one. Mama gave all mine away while I was gone with the USAF.
Doug Smith - 18/09/2022
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