Thermal Thumber (oz2959)

 

Thermal Thumber (oz2959) by Gabe Bedish from Model Airplane News 1960 - plan thumbnail

About this Plan

Thermal Thumber. Free flight power model for Cox .02 Pee Wee power.

Quote: "For sport flying, this .02 powered free flight, splendid preparation for contest ships. Simple, quite stable. Thermal Thumber, by Gabe Bedish.

Were Aristotle here to view free-flight, he would probably exclaim about seeing something of a bird. Progress!

The model presented here seems almost predisposed to be away with the slightest thermal activity. Bearing this in mind, the title 'Thermal Thumber' was contrived.

Designed for sport-flying, and, as a model to break into high performance free-flight with; the purpose of the development of Thermal Thumber is to put together a model for beginners from which stable, high performance ean be found without the modeler having more than basic knowledge of techniques of flight adjustment. The model can be constructed in a day, yet is sturdy enough to last through any trials which may occur in learning the ways of free-flight.

The shape of wing and tail surfaces on this Cox .02 Pee Wee powered Lilliput is for gaining better directional stability without reducing fine gliding characteristics. Sweepback increases directional stability and forward-placed tips help overcome stalling tendencies before they become severe.

A pylon removes the wing from much of the turbulence of the propeller stream to allow it to do work in relatively undisturbed air flow. Fuselage design provides for smooth contours; near maximum rigidity; and ease of construction.

Fuselage: A three-piece keel is com-posed of vertical and horizontal mem-bers. Trace and cut patterns for the horizontal and vertical keel members from tracing or onion-skin paper. Then, trace them on hard sheet balsa and cut out keel pieces. Cut out pylon piece and cement into place. With pin holes for guides, cement horizontal keel parts to either side of vertical keel. Attach wing mount base and retaining pins. Drill holes for pins.

Form landing gear strut. Notch the front of vertical keel to take strut. Drill hole for upper strut end. Cement strut into place. Cut hole for flight timer in vertical keel. Attach pull-cord to timer and set for ten-second run. This should allow for a 20-second engine run as fuel is emptied from tubing connection from timer to engine. Cement timer into place and attach lengths of plastic tubing fuel line. Plug exposed ends to prevent foreign matter from getting inside. Attach pull-cord guide.

Carve or rasp fairing blocks to shape from medium-soft balsa and cement them to keel pieces. Firewall is put together with hard sheet balsa sand-wiched between plywood. Drill holes for engine mounting and insert mount-ing bolts through them. Turn nuts and lock washers into a tightened position..."

Quote: "Here is Gabe Bedish's Thermal Thumber from Model Airplane News issue 02-60. I've included all pages as they are informative on how to construct the model and depict the unique graphic for the pylon."

Direct submission to Outerzone.

Update 08/07/2019: Added article, thanks to theshadow.

Supplementary file notes

Article.

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Thermal Thumber (oz2959) by Gabe Bedish from Model Airplane News 1960 - model pic

Datafile:
  • (oz2959)
    Thermal Thumber
    by Gabe Bedish
    from Model Airplane News
    February 1960 
    40in span
    IC F/F Pylon
    all formers complete :)
    got article :)
  • Submitted: 25/05/2012
    Filesize: 690KB
    Format: • PDFbitmap
    Credit*: theshadow

Thermal Thumber (oz2959) by Gabe Bedish from Model Airplane News 1960 - pic 003.jpg
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Thermal Thumber (oz2959) by Gabe Bedish from Model Airplane News 1960 - pic 004.jpg
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Thermal Thumber (oz2959) by Gabe Bedish from Model Airplane News 1960 - pic 005.jpg
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Notes

* Credit field

The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.

Scaling

This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.

 

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