Whynott (oz12736)


Whynott (oz12736) by Pat Tritle 2020 - plan thumbnail

About this Plan

Whynott. Rubber sport model. Wingspan 26 in, wing area 97.7 in.

Note this plan is a free download available from the Model Aviation site at https://www.modelaviation.com/whynott-pat-tritle where it appears along with the full build text and some great build pics. Also a free download of the plan in tiled format.

Quote: "I’ve dabbled in Free Flight (FF) for many years, but as time marched on, modeling endeavors gave way to Control Line and eventually RC. During those pursuits, FF fell by the wayside, although I never lost my desire to chase those little rubber-powered models, hopping from one thermal to the next across the prairie. After years of inactivity, the bug bit again and I decided to have another go at FF.

My goal was to design a simple Sport model that would be quick and easy to build, could deliver flight durations of a minute or so in calm air, and could be flown at smaller fields. With no preconceived notions of what the new design should look like, I simply sat down and laid out a three-view outline that 'looked about right.'

When the tweaking was done, the structure was filled in and it was time to build. The result was Whynott.

Construction is simple, incorporating only a small number of shaped parts to keep building quick and easy. Basic construction is from bits of 1/16-, 1/20- (optional), 3/32-, and 3/16-inch sheet and 3/32-inch square balsa with a few standard sizes sprinkled in where needed. Covering and trim was done with Japanese tissue and dope. The result is a worthy little Sport flyer with a ton of potential for those with larger flying venues.

Framing the Model: Begin by cutting out the parts from the appropriate wood sizes using the provided patterns. In an attempt to keep the flying weight to a minimum, ribs R2, R3, and R4 were cut from 1/20-inch balsa, although 1/16-inch balsa could be substituted with no ill effects.

Construction begins with the vertical and horizontal stabilizers. The frames are built directly over the plans using part DF and 3/32-inch square balsa. When completed, lift the frames from the board and sand to shape. Bend the tailskid from .025-inch steel wire, fit it into the rudder, and glue it in place.

The fuselage side frames are also built directly over the plans. Pin MPS in place and build the right-side frame around it. Fit the 1/16-inch balsa fill at the front, flush against the building board. The left-side frame is built the same way, but with the balsa fill flush with the top edge of the frame.

To join the frames, pin the 3/32 × 3/16-inch balsa header in place over the plans along with the two 3/32-inch square balsa crosspieces at the wing saddle. Pin the side frames upside down over the plans, align them vertically, and glue the crosspieces in place. Add the bottom crosspieces in the cabin area. Pull the tail post together, glue it, then add the remaining crosspieces aft of the cabin..."


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Whynott (oz12736) by Pat Tritle 2020 - model pic


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Whynott (oz12736) by Pat Tritle 2020 - pic 005.jpg
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Whynott (oz12736) by Pat Tritle 2020 - pic 008.jpg

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User comments

Hi Outerzone. I am only new to scratch building, this being only my third attempt. The 'Whynot' [main pic, 005-008] was just the type of model that I was looking for in terms of size and complexity. Materials used were generic craft store balsa and gift wrap tissue finished with ezy dope - nothing fancy. The plane balanced without adding any weight and came in at 57 grams with 2 loops of 20" x 3/16" rubber with an 8" igra prop.
Once built only a couple of thrust angle adjustment were required before it was making minute plus ROG flights in a climbing right circle of about 50 meters diameter. Flights were very stable with long slow glide ending in a gentle 'wheels' landing.
I would totally recommend this plan for anyone who has built a couple of kits and is looking to challenge themselves with building off the plan. From Sydney, Australia,
Lindsay Pearson - 03/12/2023
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