Buhl Airsedan (oz376)
About this Plan
Buhl Airsedan. A 1928 sesquiplane, 36 in. Span by Jon McPhee.
Update 27/03/2020: Added article, thanks to rocketpilot.
Quote: "Would you like to build a scale model that won't take three months to finish? How about one that you can fly after work at the local school yard? Read on bro', this is it! The Buhl Airsedan, by Jon McPhee.
A host of fascinating aircraft designs were spawned by the dozens of companies that grew up a long with America's infatuation with the fledgling science of aerodynamics in the years just prior to the 1929 stock market crash. The Buhl Aircraft Company, of Maryville, Michigan, was not least in putting forward some new approaches. From 1927 to 1932 the company produced a line of aircraft bearing the designation 'Air-sedan,' embracing at least eight distinct types that still shared a common, corporate look. Alfred Verville, and later Etienne Dormoy (of 1924, ultralight 'Bathtub' fame) were the designers.
These aircraft were almost unique for their time in providing indoor accommodations for passengers and pilot. They were generally powered by the reliable Wright nine-cylinder Whirlwinds, and they offered relatively high performance. Despite a lack of serious marketing, they sold well.
While the first two Airsedans were true biplanes, albeit with somewhat atrophied lower wings, later versions, including the one modeled here, were 'sesquiplanes' with one and a half wings. This arrangement looked about as useful to me as udders on a bull, with the drag of a bipe and without all of its lift. But it provides for a strong wing structure, and it also works aerodynamically. One Airsedan set a shortlived inflight duration record, with mid-air refueling, of 246 hours. Another finished sixth in the 1928 New York to Los Angeles Air Derby and 10th in the 1928 National Air Tour. Sadly, an earlier version disappeared into the Pacific during the 1927 Dole Derby race to Hawaii.
My interest in this series began with a 1965 set of British plans for the 'Junior Airsedan,' a sports car version of the aerial Oldsmobile modeled here. I flew this version free flight, and it was put out to pasture until resurrected six years ago to accommodate a recently completed Ace digital kit radio. It gave me a great many pleasant evening flights (albeit sometimes hairy due to its short tail moment), until its terminal snap roil when the wing spar gave up. The resulting 'dead duck' descent buried the engine to the firewall, but its new Silkspun Coverite kept all the parts lined up, and Hot Stuff and baking soda soon had it all back together.
I wanted to build a similar plane, with more favorable moments, and recalled an old Air Trails article on the Buhl series. Inquiries at local libraries led me to the Smithsonian Institution in Washington DC, which has the nation's best aviation library. A phone call brought a listing of available resources and copies of useful documents, especially a three-view from Volume I of US Civil Avi-tion (Aero Publishers 1962) and data from the 1929 Aircraft Yearbook (Aeronautical Chamber of Commerce). Photos are also available for scale presentations at a very fair price.
The aircraft modeled here is the Model CA-3C Sport Airsedan, which first flew in 1928 bearing Approved Type Certificate No.46. This $11,000 plane seated four passengers and a pilot, and was powered by a Whirlwind J-5 of 220 hp driving a ground-adjustable metal prop. It had the following characteristics: Span: Upper 36 ft. Lower 20 ft 10 in. Wing area 240 sq ft. 2 Length 28 ft. Empty weight 1760 lb. Useful load 1440 lb. Max level speed 134 mph, Cruise speed 112 mph.
These dimensions made it ideal for a one inch equals one foot Schoolyard Scale project, and it has proved to be a delightful flyer. The long moments damp some of the 1/2A wildness, and the exotic appearance catches people's eyes. The plane flies well with exact scale outlines and areas in the tailfeathers, so change these at your own risk. The stick construction also mimics the steel tube and spruce forms of the original.
CONSTRUCTION: The construction methods detailed in this project are light, but quite strong enough. The original weighed in at 18 ounces with a heavy paint job, a tired Babe Bee, and an Ace mini-servo setup. Please don't deviate from the wood sizes or qualities shown on the plans..."
Supplementary file notes
Did we get something wrong with these details about this plan (especially the datafile)?
That happens sometimes. You can help us fix it.
Add a correction
by Jon McPhee
from Model Builder
Scale IC R/C Biplane Civil
all formers complete :)
got article :)
Found online 17/04/2011 at:
Format: • PDFbitmap
Buhl_Airsedan | help
see Wikipedia | search Outerzone
ScaleType: This (oz376) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.
If we got this right, you now have a couple of direct links (above) to 1. see the Wikipedia page, and 2. search Oz for more plans of this type. If we didn't, then see below.
ScaleType is formed from the last part of the Wikipedia page address, which here is https://en.wikipedia.org/wiki/Buhl_Airsedan
Wikipedia page addresses may well change over time.
For more obscure types, there currently will be no Wiki page found. We tag these cases as ScaleType = NotFound. These will change over time.
Corrections? Use the correction form to tell us the new/better ScaleType link we should be using. Thanks.
Do you have a photo you'd like to submit for this page? Then email email@example.com
User commentsNo comments yet for this plan. Got something to say about this one?
Add a comment
* 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.
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.
© Outerzone, 2011-2020.
All content is free to download for personal use.
For non-personal use and/or publication: plans, photos, excerpts, links etc may be used, provided that full and clear credit is given to Outerzone with appropriate and specific direction to the original content i.e. a direct hyperlink back to the Outerzone source page.
Unauthorized use and/or duplication of this material without express and written permission from this site's owner is strictly prohibited. If we discover that content is being stolen, we will consider filing a formal DMCA notice.