Snowy Owl (oz7415)
About this Plan
Snowy Owl. Radio control sport model.
Quote: "Snowy Owl is 50-1/2 in long, spans 62-5/8 in and with fuel grosses 104 ounces. Wing loading is 25.8 ounces per square foot of wing area, and power loading with a .40 cubic inch displacement engine is 260 ounces per c.i.d. The wing section is Eppler 195, a thicker version of the E193 that is popular for soarers. The horizontal tail sports NACA 64009 and the vertical surfaces are NACA 64,012 in airfoil section.
Externally hinged slotted flaps occupy roughly 60% of the wing trailing edge. The remaining 40% is reserved for ailerons. These are top surface hinged, are of modified Frise design, and operate differentially. Down travel is one-third of up travel.
Horizontal and vertical tails have control surfaces that are similarly 'one side' hinged which also seals the joint; control horns for all surfaces are internal for reduced drag. This is the fifth of the author's designs to very successfully employ a form of 'Torsion Bar' suspension of the main gear, and a vertically sprung nose wheel. The engine cowling is a two piece ducted unit of epoxy and fiberglass. The small air intake and outlets provide adequate cooling even on very hot days, and reflects a 'turbo-prop' appearance.
The horizontal tail plane is 'T' mounted where it is out of the prop slipstream and most of the wing down wash. The canopy, composed of windshield and fuselage forward top deck, is removable, exposing all five servos, fuel tank, on-board glow plug energizing battery circuit, and nosewheel steering linkage. Similarly the lower engine cowl is easily removable providing access to carburetor and glow plug.
This model, with its long tail arm, generous dihedral and tail surfaces is a superbly stable flier (Photo 4). At half flap deployment, it takes off with a run of twenty feet. Climb-outs are at a 45 degree angle. Landings with flaps fully down are at 'walking speed' (Photo 5). Both forms of drooped wing leading edge ahead of the ailerons permit unusually high angles of attack without any tendency for a wing tip to stall and drop..."
Attached is A.G. Lennon's Snowy Owl from RCM magazine issue 01-89.
Direct submission to Outerzone.
Supplementary file notes
Article pages, text and pics.
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-
(oz7415)
Snowy Owl
by Andy Lennon
from RCMplans (ref:1034)
January 1989
62in span
IC R/C
clean :)
all formers complete :)
got article :) -
Submitted: 18/01/2016
Filesize: 1834KB
Format: • PDFbitmap
Credit*: theshadow
Downloads: 2418
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User comments
The details of this model's design principles are found in Andy Lennon's book 'Basics of R/C Model Aircraft Design', which is hosted on Outerzone's sister site, RCLibrary. It's worth keeping together with the plan in a folder on your PC.Link here : https://rclibrary.co.uk/title_details.asp?ID=1433
Martin La Grange - 01/04/2023
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- Snowy Owl (oz7415)
- Plan File Filesize: 1834KB Filename: Snowy_Owl-RCM-01-89-1034_oz7415.pdf
- Supplement Filesize: 2525KB Filename: Snowy_Owl-RCM-01-89-1034_oz7415_article.pdf
- help with downloads
Notes
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Scaling
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