Turner T-40 (oz11882)


Turner T-40 (oz11882) by Walt Mooney 1981 - plan thumbnail

About this Plan

Turner T-40 (Ophelia Bumps). Peanut scale model.

Quote: "The prototype Turner T-40 as a Peanut scale model."

Direct submission to Outerzone.

Update 2/4/2024: Added article, thanks to IanSalmon.

Quote: "Ophelia Bumps. Turner T-40, by Walt Mooney.

N115ET is a single place, low wing, wood structured, homebuilt airplane which makes up into a very nice model. Wing dihedral and horizontal tail size have been increased from the scale dimensions and of course, the propeller diameter is larger than exact scale to improve the model's flying capabilities. The name 'Ophelia Bumps' was on the original airplane in September 1965.

The structure of the model in the photos was constructed by my son, Douglas Martin Mooney. He kept pro-crastinating with respect to the covering of the model until R/C Model Builder's illustrious editor called and asked when another Peanut was to be forthcoming. As a consequence, the design and the covering job is the responsibility of the author.

The center of gravity came out exactly as shown on the plan, and with approxi-mately 3/32 inch of washout in each wing that occurred upon shrinking and doping the model (which I would have adjusted into the model if it had not occurred automatically), the model flew right off without requiring any other adjustments.

The model's structure is relatively conventional. The fuselage is built by laying down two fuselage side frames directly over the plans, then adding the top and bottom crosspieces at each upright to create a fuselage box. This model has a simple rectangular section box except at the forward end, where the cowl shapes are provided by balsa blocks cemented to the structure and carved to the appropriate contours. The cabin structure is made separately. Cut a bottom panel to the large streamlined shape shown in the top view from 1/16 sheet. Cut the top panel to the small streamlined shape from 1/4 in sheet. The cabin former is cut from 1/32 sheet.

Assemble these parts and the forward windshield and window uprights, and then add the 1/32 sheet aft panels. Carve the top to the cabin cross-section. A windshield pattern is given which is exactly the shape of the one on the model. It should provide a good starting place, but try an oversize paper one to make sure of the exact fit on your individual model.

The nose block is made to plug into the front of the fuselage box, It includes the forward end of the carburetor air inlet which will tend to be subject to easy breakage unless reinforced by a couple of pins, indicated by two vertical dotted lines in the nose block front view.

The wing is built using the sliced rib method. Pin down the trailing edge over the plans; do likewise with the leading edge. Using 1/16 square balsa, cement the bottom caps of the ribs in place. Cut a one-piece spar out of 1/16 sheet, using the wing tip and spar center section details as a guide. Don't forget the tip gussets. Cement the left end of the spar in place on the bottom rib caps.

When dry, cut the left-hand dihedral breaks in the leading and trailing edges and lift the left wing until the spar can be cemented to the right root rib, then lift the center section until the spar can be cemented to the right wing rib caps. Now slice the upper rib caps and cement them to the three spanwise structural members..."

Supplementary file notes



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Turner T-40 (oz11882) by Walt Mooney 1981 - model pic

  • (oz11882)
    Turner T-40
    by Walt Mooney
    from Model Builder
    February 1981 
    13in span
    Scale Rubber F/F LowWing Civil
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 20/12/2019
    Filesize: 207KB
    Format: • PDFbitmap
    Credit*: JoeFergusson, Poacher
    Downloads: 479

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    ScaleType: This (oz11882) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.

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Turner T-40 (oz11882) by Walt Mooney 1981 - pic 003.jpg

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User comments

Just adding a note here. Have set the title of this one now as Turner T-40, rather than Ophelia Bumps, as it was previously. Seems more useful for searches.
SteveWMD - 02/04/2024
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