Edbergs modification - RC Groups
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Mar 07, 2013, 07:24 AM
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Edbergs modification

Hope I'm not disturbing the high tech ether too much with older stuff.

The following thread is about: Don Edbergs “Sagitta” modification from WC 1981

A member in our club (Per Nyberg) was a participant in Swedish F3B team 1981. Per met the US team member Don Edberg at the WC. With recommendations from Don Per constructed a straight wing Sagitta with carbon reinforcement, geometry like Sagitta 900 wing (constant chord, tapered outer). A glider Per used with great success 1982-83. After a while we had a couple of these gliders in our F3B league.
The modified Sagitta and the following development of similar models based on Don Edberg modification was Sweden's first step towards an international standard. And like others in Sweden by this time, my first own design was based on Sagitta: fuselage, wing joiner etc.

In retrospect the Sagitta mod. from Edberg and of course the Gobbler from Holley was a good answer to the Dassel and other hot gliders from WC 1979. Not molded but robust gliders with a sound geometry. In my opinion Don Edberg's model has not received the publicity it deserves, at least in my area.
It seems to be quite a few facts about this glider published and I would like to now more.
What I found so fare is the following:
Three different names seam to exist:
Sagitta mod.
Sagitta 838
Hustler: Foam wings, Modified Sagitta 900 fuselage, airfoil: E205, wing area: 54.45 dm2 (840 sq. in.), weight 1800 g (4 pounds). The wing has aileron and was straight - single tapered. One servo to each aileron. Wing fully sheeted: 1,5 mm balsa (1/16)
I am thankful for all types of information about Don Edbergs 1981 WC glider. My plan is to construct a replica if I get enough information (a friend has the Gobbler kit, have to beat him in 2-lap speed ).

Thanks in advance,
Joakim Stahl

PS. Lovely tread: “A little bit of F3B history”, thanks guys! DS.
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Mar 07, 2013, 01:05 PM
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jrs_123's Avatar
Model Builder Jan 1983 (pic1), Model Aviation June 1982 (pic2, pic3)

other from Model Aviation magazine too
Last edited by jrs_123; Mar 07, 2013 at 01:48 PM.
Mar 07, 2013, 04:27 PM
or GPS, F, J, K, or even TD
FLY F3B's Avatar
Awesome pictures. I competed in that Team Select with Mark, Don and Alex. Missed the final day by one or two places....

Mar 07, 2013, 04:57 PM
F3B and F3K
RetoF3X's Avatar
Great pictures. jrs_123, if you have more of them, please post them in this thread entitled " a little bit of F3B history"


It contains valuable input, among others Nick Wright posted some great stuff there.

Sorry for off topic, back to the Edberg modifications.

Mar 07, 2013, 05:16 PM
Glider Geek!
lenci1938e's Avatar
Man...those photos bring back a lot of great memories. When I was 14 my Dad and I went up and spent the day at the WC's in Sacramento. We were just getting started in R/C soaring and I thought Don Edberg and the "Hustler" were the bomb. He was still going to school at Stanford I believe, and was a flying with the South Bay Soaring Society up here in Northern CA. He was also competing in our Northern California Soaring League contests so I would see him and those sailplanes at local events. I still have a bunch of photos taken at Curtis High School in San Jose of Don the the Hustler. The Sagitta 900's had just came out and the Hustler was the sexiest ship I had ever seen. I built 4 Sagitta 900's back in my teens. Two with polyhedral and two flat wing with ailerons. All were red, just like my hero Don's airplanes were. Looking back now you would call in my first "man crush." Very cool airplanes.

Mar 08, 2013, 11:31 AM
Registered User
Closing in, awesome pictures very helpful, thanks.
Clipped wing was probably 2M version.

Hustler "F3B" version, so fare:
I guess Don used 10 in root chord as Sagitta. If he used Sagitta tip chord,
wingarea should be approx. 850 sq in. if span 100 in. Aspect radio about 11.5.

Mar 08, 2013, 04:59 PM
Glider Geek!
lenci1938e's Avatar
Here are my photos from the Santa Clara contest February 1982.

Mar 08, 2013, 08:32 PM
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Avaldes's Avatar

Send me a PM with your email address and I will put you in touch with Don Edberg.

Mar 08, 2013, 09:28 PM
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R.M. Gellart's Avatar
Those pics were published about the time I was done with my graduate degree and was getting really into RC and soaring seriously. I drewled over them.

Mar 09, 2013, 09:09 PM
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jrs_123's Avatar
Edberg himself discussed the design as part of this article -- from the Soaring History thread
Mar 10, 2013, 01:34 PM
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jrs_123's Avatar
maybe contact him directly

Mar 19, 2013, 11:21 PM
Egads! It's a GIRL!
Lil Stinkpot's Avatar
Originally Posted by lenci1938e
Here are my photos from the Santa Clara contest February 1982.

Curtis sure has shrunk over the years. I was a tad young (1) when those photos were taken. Here's two from last year.
Mar 22, 2013, 05:00 PM
Registered User
Anyone have any photos of these old planes? Don't recall these but it may have been about the time I started sailplanes
Tai Tai

Thanks Jerry

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