Guff (oz14604)
About this Plan
Guff. Free flight power model. Wingspan 6 ft.
Direct submission to Outerzone.
High resolution scan, from the full size paper plan.
Note the Walt Good Guff (oz2319) first appeared in Air Trails, June 1940. This here is a later redrawn plan published in Model Builder, Sept 1977, drawn for MB by Al Patterson.
Quote: "OLD TIMER Model of the Month: Walt Good's Guff. Text by: Bill Northrop Redrawn by: Al Patterson.
For a modeler who is primarily known as an expert and pioneer in the develop-ment of radio control, it may come as a surprise to some 'new' old timers to find out that Dr Walter Good was also an accomplished free flight designer and flier. As a key member of AMA's R/C Frequency committee, Walt is just as noteworthy in the model airplane hobby today as he was almost 40 years ago when he took first in the 1938 Scripps-Howard Junior Aviator National Air Races with this month's feature model, the 'Guff'.
Reputed to be one of the few air-planes that could give the venerable Zipper (oz387) a run for its money, the Guff climbed in a straight-up pattern of 80 to 90 degrees, with no bank, at a rate of about 1,500 feet per minute, and popped out into a flat, soaring glide that locked it into thermals as though it were electronically controlled.
Construction is all very simple; a four-longeron box fuselage covered with 1/32 sheet, and rib-and-spar flying surfaces. Except to modify it for a DT tail, or for R/C, we'd only suggest one slight change. The wing-dowel locations shown will tend to force the wing back, with only two small keys (or 'warts' as Walt called them) to prevent it from happening. To even up the forces, we'd suggest moving the rear dowel forward of station C by about one inch, or moving the front dowel forward of station A about a half inch.
Incidentally, in the same June, 1940 Air Trails in which the Guff was pub-lished, there was an ad by Midwest Model Supply, Chicago, Illinois, for a Guff kit. The price? Just $4.89 postpaid! Please, those of you who 'bought' our story about GHQ's in the April issue, don't send any orders for Guff's to Midwest!"
Supplementary file notes
Article.
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(oz14604)
Guff
by Walt Good
from Model Builder
September 1977
72in span
IC F/F
clean :)
all formers complete :)
got article :) -
Submitted: 05/06/2023
Filesize: 839KB
Format: • PDFbitmap
Credit*: TomRyan
Downloads: 302
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User comments
about the first succesfull rc model Guff and the Good brothers see: https://www.youtube.com/watch?v=jduj1wkGFT0&t=9spit - 06/06/2023
I was hoping there would be at least one other flier who would chime in with their experience with the Guff as an R/C model, but with no takers as yet, here’s what I discovered.
Al Hellman and I were members of the SAM 49 club back in the 1980s. He showed up at a Taft contest one weekend with his old F/F Guff recently converted to R/C, and asked me to do the first test flight for him. We checked it over and took it to the flight line. I don’t know how Al’s model performed as a free flight, but it was without question the Dutch-rollingest R/C Old Timer I’ve ever flown. Almost totally uncontrollable! Got it down in one piece, fortunately, and I don’t recall that we ever worked up the courage to try it again. It was one of those flights that remain burned into one’s memory even after decades.
I believe the Dutch-roll was caused by a combination of the large fuselage side area up front, a relatively small vertical stab, and the probability that at least part of the fin gets blanked out by the sharp downward sweep of the short-coupled fuselage aft of the wing. I’d almost be willing to bet my next Social Security check that if you straightened out the top of the fuselage, raised the tail up accordingly and added a bit more fin area, you’d have something very close to Frank Ehling’s Contest Gas model, one of the sweetest-flying O.T. ships ever designed.
Phil Bernhardt - 11/06/2023
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- Guff (oz14604)
- Plan File Filesize: 839KB Filename: Guff_MB_oz14604.pdf
- Supplement Filesize: 424KB Filename: Guff_MB_oz14604_article.pdf
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Notes
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