Leprechaun (oz3252)

 

Leprechaun (oz3252) by Dick Twomey from Aeromodeller 1950 - plan thumbnail

About this Plan

Leprechaun. Free flight towline glider.

Quote: "The designer of this model is already well-known to readers of the Aeromodeller for his Cobra (oz4164) and Rebel (oz7342), which were published while he was still at school. He is already making a place for himself in contests, but at present National Service has him in the RAF.

Leprechaun, his latest design, has one feature unusual in high-performance sailplanes: low aspect ratio, in this case 6:1. He had felt for some time that low aspect ratio deserved more attention, being more stable, and on Leprechaun consistently high performance has proved it's efficiency. A special wing section developed from the Swedish series has been used, and this conbined with the low AR pylon polyhedral and high tailplane mounting forward of the fin, make the design the acme of stability.

Although the span is only 103 inches, the wing area is greater than most of the famous 10 and 11 foot sail planes, being 1,647 sq in. The construction of the model is perfectly straightforward..."

Quote: "Here is my CAD tracing of the Leprechaun. This is an extremely large glider which is really impressive. The last time I saw a full size one was floating in a thermal over Barkston Heath many years ago."

This is a modern redrawn plan in PDFvector format.

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Planfile includes article pages.

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Leprechaun (oz3252) by Dick Twomey from Aeromodeller 1950 - model pic

Datafile:

Leprechaun (oz3252) by Dick Twomey from Aeromodeller 1950 - pic 003.jpg
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Leprechaun (oz3252) by Dick Twomey from Aeromodeller 1950 - pic 004.jpg
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Leprechaun (oz3252) by Dick Twomey from Aeromodeller 1950 - pic 005.jpg
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Leprechaun (oz3252) by Dick Twomey from Aeromodeller 1950 - pic 006.jpg
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Leprechaun (oz3252) by Dick Twomey from Aeromodeller 1950 - pic 007.jpg
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Leprechaun (oz3252) by Dick Twomey from Aeromodeller 1950 - pic 008.jpg
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Leprechaun (oz3252) by Dick Twomey from Aeromodeller 1950 - pic 009.jpg
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Leprechaun (oz3252) by Dick Twomey from Aeromodeller 1950 - pic 010.jpg
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Leprechaun (oz3252) by Dick Twomey from Aeromodeller 1950 - pic 011.jpg
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Leprechaun (oz3252) by Dick Twomey from Aeromodeller 1950 - pic 012.jpg
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User comments

Are there any dimensions available on the larger leprechaun?
John - 26/08/2018
I think that you will have to have a full size copy for you able to take measurements. You can see that the author did not give any more that what is shown on the faithful restoration by Hogal. There is also a plan view at RCGroups, Vintage & Old-Timer Designs, Vintage & Old Timer Plans Pre 1960 Plans Only.
rchopper56 - 27/08/2018
Hi - some photos of my new built Leprechaun glider [more pics 004, 005].
PhilipHickey - 30/10/2018
I got involved in a discussion many years ago about what was written on the wing of the original Leprechaun. The problem was solved by my better half who grew up in Ireland and learned Gaelic (which was, and still is, a compulsory subject). The text reads 'Tuama' which is the Gaelic version of 'Twomey', the designer's surname!
ChrisPinn - 31/10/2018
I built a model of the Leprechaun from APS plan about 1990. The problem I had was that every time she landed the rear end of the fuselage broke off, immediately in front of the tailplane assembly. As many models of the Leprechaun fly successfully, can anyone tell me what I did wrong? Wouldn't mind building another Leprechaun using Depron and an electric power pod.
Malcolm Jackson - 22/01/2019
You did nothing wrong! The structural design is poor, slimming down as it does to a very thin section that has a very low moment of resistance. As long as the model lands in a straight line it will be OK. However if the wing catches on something and slews the model around, the radial acceleration will snap the tail off.
Denis - 24/01/2019
Attached pictures of our Leprechauns in their maiden flight in Zarautz (Spain) [more pics 006, 007].
Ignacio_Martinez - 11/02/2019
Where can I get the drawing of the current Leprechaun, with the lowered wings?
Aard Textor - 01/08/2019
Please find attached photos of my recently completed & flown Leprechaun glider from the oz 3252 plan [more pics 008-012]. Our club field does not suit high start or winch launching and not having a scenic sea side cliff available to hurl it off I modified the model for aero tow only. Wing and stab incidence is exactly the same as the plan. The wing rib under-camber is half of that shown on the plan. 2 only 5m rolls of covering were used with some left over. All up flying weight of my model came out at 2.665 Kg due to the extra wood used to help it survive being dragged across the field during launch (a maximum of 1 1/2 fuselage lengths it turned out!). The weight includes a 6v 4200 ma 5 cell NiMH battery for the three servo flight pack. The first flights were at the Oakwood Model Club annual Glider Fun Fly this past June 2019. What a terrific flying model this turned out to be, far exceeding my high hopes. Thanks to Mr. R. A Twomey for such a long lived versatile design.
MikeFoster - 16/08/2019
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