Grand Esprit (oz9015)
About this Plan
Airtronics Grand Esprit. Advanced competition class radio control sailplane.
Later kitted by Dream Catcher Hobby Inc.
Quote: "Dear All at OuterZone, Please find attached the plans of the Airtronics Grand Esprit. I do not know a lot about this model ... It is just to complete the Airtronics sailplanes range. Amicalement,"
Direct submission to Outerzone.
Update 13/03/2019: Added PDFvector plan tracing and CAD file, thanks to AlanSinclair. Note these files include full wing rib templates, all parts.
Direct submission to Outerzone.
Update 12/03/2020: Added kit review from August 1975 RCM, thanks to RFJ.
Quote: "RCM Product Test: Airtronics Grand Esprit.
Doing this product report for the Grand Esprit is almost like doing a review of a motion picture that has already won the Academy Award. First introduced on the cover of the July 1973 issue of RCM, the giant sailplane has been going strong ever since. Whenever you read an article about big gliders there's usually some mention of it. You may recall Tony Estep's article in theDecember 1974 RCM, quote: The Grand Esprit has achieved the widest acceptance of any kit plane among serious NSS Contest fliers in the geographical area - a couple of hot-shot competitors have abandoned their original designs to go the Esprit - which is perhaps the ultimate tribute.
With regards to the kit, everything you'll need except the covering and radio is included in the kit, including the Vector Director for elevon control, pushrods, horns, hinge material, adjustable towhook, instrument housing, skid, etc. All of the wood parts accurately machined and packaged and labeled in plastic bags.
There is no doubt that the Grand Esprit is a rugged ship. It has plywood pod sides with 1/2 in balsa floor and 1/4 in plywood keel insert. The boom is glass epoxy. The wing has double hardwood spars with plywood webbing on the inboard panel and geodetic ribs. To make the elevons sturdy, a hardwood sub leading and trailing edge is used along with geodetic cross members. The instructions are quite good and program you through the building sequence as well as offering many good building ideas.
In addition to glassing the bottom of the pod to make it more resistant to rock dings, we also glassed the wing from the root to the first bay to decrease the possibility of cracking the wing root sheeting when putting the wing on and taking it off. All-in-all, the building went easier than we had anticipated, and there was nothing unusual at all to installing the radio equipment and adjusting the pushrods and spoiler linkage.
For our first glide test we had to add a couple of ounces of lead to the nose to achieve the proper Center of Gravity. We held the glider high and pushed it off. And away it went, steady as a rock into a breeze to a smooth landing about 50 to 60 feet in front of us. After a couple of additional tries to test the elevons, we tried the spoilers. With the same hand launch it made a smooth landing, in about 15 to 20 feet - they work!
Next, we made the long trip up the.hill and tossed it off into a four mile per hour breeze. A little down trim was added and up it went, just as Lee Renaud said it would in the building instructions. Whether on a Hi-Start, electric winch, or on the slope, everything they say about it is true. The graceful lines make the Grand Esprit a beautiful and distinctive sight to see up there.
And it does fly well for the serious Open Class competitor or the glider enthusiast desiring to move up to a high performance sailplane."
Update 22/05/2020: Replaced the PDFvector and CAD files (with revised versions) thanks to AlanSinclair.
Quote: "Hello, I was working on drawings for the Super Esprit Wing and discovered some minor errors in the original rib templates, so I had to go back and revise the Grand Esprit drawings. Here are the updated drawings for the Grand Esprit. Thank you, stay safe. Alan"
Update 05/02/2021: Added kit instructions, thanks to AlanSinclair.
Supplementary file notes
Appended section, 2 pages showing CG balance point and wing sections.
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- Grand Esprit (oz9015)
- Plan File Filesize: 1235KB Filename: Grand_Esprit_134in_oz9015.pdf
- Supplement Filesize: 114KB Filename: Grand_Esprit_134in_oz9015_appended.pdf
- Supplement Filesize: 6457KB Filename: Grand_Esprit_134in_oz9015_instructions.pdf
- Supplement Filesize: 901KB Filename: Grand_Esprit_134in_oz9015_review_RCM.pdf
- Supplement Filesize: 1684KB Filename: Grand_Esprit_134in_oz9015_vector_.pdf
- CAD Zip Filesize: 911KB Filename: Grand_Esprit_134in_oz9015_CAD.zip
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