Hiperbipe (oz4081)


Hiperbipe (oz4081) by Frank Massa 1978 - plan thumbnail

About this Plan

Sorrell SNS-7 Hiperbipe. Scale model for Radio control. A bigger Hyperbipe .40-.60 size scale biplane of the homebuilt EAA type.

Update: Added article (from RC Sportman, August 1978) thanks to Tom Solinski.

Quote: "Building that bipe, by Frank Massa.

My fascination with the Hiperbipe began when I first spotted it on the cover of Sport Flying Magazine, Vol. 10, No. 1, Spring 1976. The cover of this magazine had a very attractive view of this most unusual biplane performing seemingly effortless knife-edge flight. It was quite an impressive photo and very much characterized the hearty insatiable aerobatic appetite of this out-of-the-ordi-nary negative stagger wing ship. As the article was carefully read and re-read, a realization emerged that the magazine's editorial staff was highly impressed with this homebuilt. Not only was the article comprehensive but complete with extensive photos and three views.

From some angles the Hiperbipe is most unpleasing and could be considered ugly. However, from others it is unusual, and from a preferred few there can be no equal to its beauty. After one looks at this short coupled, wide bodied, two winged wonder for any length of time, many of the seemingly unpleasant views disappear. (This is due to the phenomenon called angular selection.) It is then that the true functionality of the aircraft's design becomes increasingly apparent.

The Sorrell family, who originated the Hiperbipe, did extensive design research along with trial and error building of several biplanes to arrive at the Hiper's final configuration. The SNS6 (Sorrell Negative Stagger 6th version) is the culminating result of all their hard work and devotion to achieving one of the most classy, acrobatic, daringly different designed homebuilts to date.

From actual air show spectator comments and written magazine coverage of the air show circuit, one would have to agree that Mark Sorrell (air show pilot of SNS6) does such wondrous maneuvers with the Hiperbipe that the performance leaves the crowds awe-struck and in absolute amazement at the ship's aerobatic capabilities. The more one looks at this 'chubby-stubby' the more one has the Feeling that the ship started out as an abandoned wing of which a slice was taken at the thickest airfoiled section. As an afterthought, the wings were added for stability. Actually, this idea is not so farfetched, for the original design was that of an airfoiled fuselage that had the windshield extended to the spinner to achieve this airfoiled shape. Due to engine heat and the hot sun on all that expanse of plexiglass the present windshield shape was arrived at. All in all, the design is very successful and it was this success that inspired me to immitate this very attractive ship in model form. Beauty is in the eye of the beholder and, to me, this ship is pure in aesthetics and aerodynamics.

I had been searching for a 'sport scale' subject and wanted one that would be unique yet allow conventional building techniques at the same time, This ship cer-tainly fits that bill. Some basic design considerations were foremost to me and these were initiated in the actual model construction. As a first step, the parameters were established and then the plans were drawn as close to these as a built-up model would allow. The following are the guidelines that the model centered around:

(1) Engines from .40 to .45 size.
(2) Weight 4-1/2 to 5-1/2 lb.
(3) Construction basic and straight forward for the average modeler.
(4) Wing alignment consistent each time the wings were bolted on.
(5) As accurate an outline as possible would be maintained without sacrifice to structural integrity.
(6) Documentation and three views had to be easily obtainable.
(7) Ample radio space.
(8) Wing loading of 18 oz sq/ft at 4-1/2 lb.

A prototype was built and many fine points were learned about the aerodynamics of the negative stagger biplane configuration. The resultant plans represent the correct incidences, moments and construction needed for exacting aerobatic flight..."

Direct submission to Outerzone.

Update 17/05/2021: Added review from Flying Models, August 1978, thanks to RFJ.

Update 7/11/2022: Added article, also Build Note [see pic 005], thanks to theshadow.

Supplementary file notes

Article previous scan version.
Build note.


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

Hiperbipe (oz4081) by Frank Massa 1978 - model pic

  • (oz4081)
    by Frank Massa
    from Master Kits, RC Sportsman (ref:SNS-7)
    August 1978 
    42in span
    Scale IC R/C Biplane Cabin Kit
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 02/03/2013
    Filesize: 1523KB
    Format: • PDFbitmap
    Credit*: dfritzke
    Downloads: 4258

  • Sorrell_Hiperbipe | help
    see Wikipedia | search Outerzone
    Test link:
    search RCLibrary 3views (opens in new window)

    ScaleType: This (oz4081) 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/Sorrell_Hiperbipe
    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.

Hiperbipe (oz4081) by Frank Massa 1978 - pic 003.jpg
Hiperbipe (oz4081) by Frank Massa 1978 - pic 004.jpg
Hiperbipe (oz4081) by Frank Massa 1978 - pic 005.jpg

Do you have a photo you'd like to submit for this page? Then email admin@outerzone.co.uk

User comments

No comments yet for this plan. Got something to say about this one?
Add a comment



Download File(s):
  • Hiperbipe (oz4081)
  • Plan File Filesize: 1523KB Filename: Hiperbipe_oz4081.pdf
  • Supplement Filesize: 4577KB Filename: Hiperbipe_oz4081_article.pdf
  • Supplement Filesize: 1194KB Filename: Hiperbipe_oz4081_article_previous.pdf
  • Supplement Filesize: 3468KB Filename: Hiperbipe_oz4081_review.pdf
  • help with downloads


* 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.


Terms of Use

© Outerzone, 2011-2024.

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.