Osprey 100 (oz9821)


Osprey 100 (oz9821) from Sailplanes International 1988 - plan thumbnail

About this Plan

Osprey 100. Radio control sailplane model.

Quote: "Howdy, I just rectified, scaled, and cleaned a plan that I know some of sailplane guys would like to have. hoping you can include in the Outerzone collection. The Osprey 100 was apparently designed and kitted in the 1980s and although a kit shows up now and then, I'm told they're long out of production and quite rare.

The original of this plan was sloped, keystoned, off-size, and dirty, but a nicely flat image at 90-some percent scale, so quite workable. Unfortunately it was a 72dpi jpg. I kept the resolution at 72, but it looks good from a distance and is easily good enough to build from printed full size... Thanks for having the archives - it is one of the very best things on the internet! Best Wishes,

Here are the details on the plane:

Wingspan 99 1/2in
Airfoil: modified E-176
Length 51in
Wing Area 799 sq in
Weight 2lb 12oz
Wing loading: 8oz/sq ft
Type: Glider, thermal or slope

Description: The Osprey 100 is a high performance standard class glider developed in the late 1980s from the already well-known 64 inch Osprey (oz6577) by Sailplanes International. Designed for rudder and elevator controls, the plans also include provision for ballast and spoilers.

According to the kit maker's box notes, the plane: is very forgiving and is suitable for thermal soaring, cross country competitions, and general sport flying. Being robust, it will take a fair amount of punishment. And it is this 'designed-in' strength, and suitability for varied tasks, that will make Osprey 100 a great all-time favorite!"

There's also a good page with a kit review of the Osprey 100 available online at: http://www.bartonhewsons.uk/home/modelflying/soarers/osreview.htm dating back to 1988.

Direct submission to Outerzone.

Update 30/04/2018: added kit review from Radio Modeller, August 1992, thanks to RFJ.

Update 02/07/2018: Added a sheet showing rib templates, thanks to SteveBailey.

Quote: "Hi Steve and Mary, I saw the request for outer wing panel ribs for the Osprey 100. I drew these up, and obviously I hope they will work. The plan you have is fairly low resolution, so I did my best. Note I provided both metric and English dimensions for the spare notches."

Update 29/11/2018: Added further review from R/C Model World, July 1989, thanks to RFJ.

Update 28/10/2020: Added kit instructions (12 pages) thanks to Geoff Hosking. See comments for more info.

Supplementary file notes

Rib templates.


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Osprey 100 (oz9821) from Sailplanes International 1988 - model pic

  • (oz9821)
    Osprey 100
    from Sailplanes International
    100in span
    Glider R/C
    all formers complete :)
  • Submitted: 01/03/2018
    Filesize: 985KB
    Format: • PDFbitmap
    Credit*: AlanStein, SteveBailey, GeoffHosking

Osprey 100 (oz9821) from Sailplanes International 1988 - pic 003.jpg
Osprey 100 (oz9821) from Sailplanes International 1988 - pic 004.jpg
Osprey 100 (oz9821) from Sailplanes International 1988 - pic 005.jpg

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User comments

Looking at Osprey as a potential build. However reviewing the file I find there is no information or details about the wing ribs? Can anyone provide that information? Thanks,
Ron - 30/06/2018
There's a main rib shown on the fuselage side view of course, but that still would leave you drawing out all the smaller ribs for the tapered section, from scratch. Anyone got more on this?
SteveWMD - 30/06/2018
Sorted now, thanks to SteveBailey :)
SteveWMD - 02/07/2018
Hi Steve or anyone else, how do you find the tapered rib details? Very keen to build this beauty. Cheers,
Alan Minnie - 08/06/2020
It's the supplement file called 'ribs' in the Download Files section.
SteveWMD - 08/06/2020
Would certainly add some spoilers ( a small 9grm servo under each spoiler) to the inner panels, especially if the site you fly at has a tight landing area. Nice mannered plane and capable of some reasonable thermal flights only real limits are down to size - seeing her at height (Dark underside colour will help) !
Tim Lewis - 28/09/2020
Hi, I've just been building the Sailplanes International Osprey 100 from a kit that has been lurking in my loft for the last 31 years, and noticed that on the site you did not appear to have the building instructions supplied with the kit. The attached pdf file contains these together with (at the end) a full materials listing [see supplement file in download section].
A few things I found building from the kit:
1/ The towhook position is shown to be virtually directly beneath the CG; in my previous experience this tends to cause instability on the tow so I have moved it forward by an inch.
2/ It is necessary to cut a shallow "V" at the top of formers 3 and 4 in order to get the wings to sit in the correct position; otherwise you are trying to balance them on the edge where the wing halves join and that just isn't going to work! However cutting the "V" reduces the wood in the formers above the retaining dowels so I have added a little reinforcement to compensate.
3/ Most of the materials in the original kit were of excellent quality; however the die cutting of the wing ribs appeared to have been undertaken by a blind man with a blunt penknife and leading and trailing edges of the ribs were both badly crushed (this might be why the kit finished up in the loft in the first place); I therefore finished up scratchbuilding replacements.
Thanks for the great resource; it's inspired me to look at building some of the classic designs from the past. Kind regards,
Geoff Hosking - 28/10/2020
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Download File(s):
  • Osprey 100 (oz9821)
  • Plan File Filesize: 985KB Filename: Osprey_100_RC_oz9821.pdf
  • Supplement Filesize: 746KB Filename: Osprey_100_RC_oz9821_instructions.pdf
  • Supplement Filesize: 2165KB Filename: Osprey_100_RC_oz9821_review_RCMW.pdf
  • Supplement Filesize: 1180KB Filename: Osprey_100_RC_oz9821_review_RM.pdf
  • Supplement Filesize: 269KB Filename: Osprey_100_RC_oz9821_ribs.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.


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