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  #21  
Old 08-19-2011, 09:37 PM
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blackshire blackshire is offline
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Quote:
Originally Posted by John Brohm
Scigs;

Very nice build. If you still have the decal scan Scott could use it for YORP.

It appears from your build that your model used the 8" airframe, same as the Gnome.
I concur (the Estes "Gemini Star Raiders" Starter Set looks like a very nice one, by the way!); I began to doubt the short body tube length of Micromeister's Leprechaun after looking at it for a while (the yellow-painted forward section threw off my perception of the total length). Also, last night I temporarily spliced two 3" lengths of BT-5 together with an HTC-5 tubing coupler to make a 6" tube, then dry-fitted the fin unit, forward ring, and nose cone from a Gnome kit onto/into it. It looked quite short just by itself, and placing it next to a built Gnome (and a Puma RTF rocket) enhanced that perception even more. When my 6" lengths of BT-5 arrive from Semroc, I'll build a few "aerodynamic clone" Leprechauns.
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http://www.lulu.com/product/cd/what...of-2%29/6126511
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Last edited by blackshire : 08-19-2011 at 10:39 PM. Reason: This ol' hoss done forgot somethin'.
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  #22  
Old 08-23-2011, 12:38 PM
scigs30 scigs30 is offline
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I am back from my long summer vacation and will scan and post the decal tonight. I have the decal drawn up in Coreldraw, just have to find it. Once I find it, I can send it to Sandman.
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  #23  
Old 08-23-2011, 12:51 PM
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blackshire blackshire is offline
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Quote:
Originally Posted by scigs30
I am back from my long summer vacation and will scan and post the decal tonight. I have the decal drawn up in Coreldraw, just have to find it. Once I find it, I can send it to Sandman.
Thank you very much!
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Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
http://www.lulu.com/content/paperba...an-form/8075185
http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com.
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  #24  
Old 08-23-2011, 11:32 PM
scigs30 scigs30 is offline
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Here is the scan and the PDF version was drawn in Coreldraw. Sandman, you can have it if you want, just print it out with Spot Green.
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  #25  
Old 08-24-2011, 01:47 PM
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jharding58 jharding58 is offline
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To toss this in, the measurement of the two images shows no difference in distance from tip of nosecone to the shock cord retaining ring. I would assume by retaining the 1.25 distance from the tube lip would move the mass further forward by lenghtening the BT.
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  #26  
Old 08-24-2011, 02:17 PM
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Shreadvector Shreadvector is offline
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I have not read the entire thread, but I saw a question about stability.

Gnomes have a history of stability problems. The most common cause of instability is use of an A10-3T with the new motor hook that extends far enough towar the rocket centerline to allow the exhaust from the loarge nozzled A10-3T to hit the motor hook and be deflected. This was extremely worse when the motors had the "poopy clay" nozzles (long since corrected by Estes with the current "Strong Like Ox" clay).

Builder errors couls also cause instability. The upper lug loves to destabilize so if it is too far forward you have trouble. And if the fin unit is installed too far forward the fins will not provide enough correcting force.

Longer tube is better, so the original short Leprechaun was undoubtedly a stability nightmare - especially if an A10-3T was used and you got the deflecting thrust.
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  #27  
Old 08-24-2011, 04:35 PM
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mwtoelle mwtoelle is offline
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However, Estes did not start using the motor hooks with the finger tabs until 1993. Even the old Mini-Brute Javelin (0815) used a washer for nose weight; it was similar in size to the Gnome.
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  #28  
Old 08-24-2011, 08:35 PM
scigs30 scigs30 is offline
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I have 2 of these kits, the boxed version and the Leprechaun by itself and they are the same. They both have white body tubes and yellow plastic parts. The body tubes are 8 inches and the directions call for painting because you have to paint the upper a lower body tube yellow. The yellow parts are the same ones that are now used in the Estes Mini Customizer http://www.estesrockets.com/rockets...stomizer-minitm
All you would have to do is order the parts from Estes or better yet use the 50 percent off Michaels coupon to buy the kit and buy a 8 inch bt from Semroc. Then print my decal out on decal paper and you are set to go.
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  #29  
Old 08-24-2011, 11:54 PM
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blackshire blackshire is offline
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Quote:
Originally Posted by Shreadvector
I have not read the entire thread, but I saw a question about stability.

Gnomes have a history of stability problems. The most common cause of instability is use of an A10-3T with the new motor hook that extends far enough towar the rocket centerline to allow the exhaust from the loarge nozzled A10-3T to hit the motor hook and be deflected. This was extremely worse when the motors had the "poopy clay" nozzles (long since corrected by Estes with the current "Strong Like Ox" clay).

Builder errors couls also cause instability. The upper lug loves to destabilize so if it is too far forward you have trouble. And if the fin unit is installed too far forward the fins will not provide enough correcting force.

Longer tube is better, so the original short Leprechaun was undoubtedly a stability nightmare - especially if an A10-3T was used and you got the deflecting thrust.
Even when the Gnome was new, its widely-separated launch "luglets" looked like they could cause a large amount of launch rod "tip-off," especially on windy days and/or with low-impulse ("1/2A") motors. With "short body tube" Leprechaun clones, I wouldn't even consider using the new motor hooks because the rockets' shorter (6") body tubes would enable any side-thrust from the motor hooks' finger tabs to more easily make the rockets veer off course--I'll use Semroc's old-style mini motor hooks in mine.
Quote:
Originally Posted by mwtoelle
However, Estes did not start using the motor hooks with the finger tabs until 1993. Even the old Mini-Brute Javelin (0815) used a washer for nose weight; it was similar in size to the Gnome.
That is true, but the Gnome does have one advantage--its plastic nose cone is significantly heavier than the Javelin's balsa nose cone, which made the washer nose weight necessary.
Quote:
Originally Posted by scigs30
I have 2 of these kits, the boxed version and the Leprechaun by itself and they are the same. They both have white body tubes and yellow plastic parts. The body tubes are 8 inches and the directions call for painting because you have to paint the upper a lower body tube yellow. The yellow parts are the same ones that are now used in the Estes Mini Customizer http://www.estesrockets.com/rockets...stomizer-minitm All you would have to do is order the parts from Estes or better yet use the 50 percent off Michaels coupon to buy the kit and buy a 8 inch bt from Semroc. Then print my decal out on decal paper and you are set to go.
Indeed--and one will also have some extra, useful parts left over (such as the little-seen plastic version of the BNC-20B, for example)--thank you for posting this link!
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Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
http://www.lulu.com/content/paperba...an-form/8075185
http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com.
NAR #54895 SR

Last edited by blackshire : 08-25-2011 at 03:56 AM. Reason: This ol' hoss done forgot somethin'.
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