Scrath 54mm UFO

n3tjm

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I wanted to build a new 38mm UFO to fly my G sparkies in. So I looked around the shop to see what I had on hand. I didn't have any more 38mm tubing so I decided to use a 54mm tube instead. I bought some foam board, and poster board, and started building. Here I am cutting out the horizontal disk from the foam board (disk from now on).

01_Cutting_out_disk.jpg
 

n3tjm

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Printed out the patterns for the top and bottom skirts. Then I taped them together and cut them out.
03_Skirt_Patterns.jpg
 

n3tjm

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Launch lug is glue onto the motor tube. I used an Aerotech Igniter Tube from a RMS 29/180 reload, and just by chance, its the exact same length of the motor tube.

05_Glued_on_LL.jpg
 

n3tjm

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The top skirt is glued into place. For alignment purposes, the ring is placed into position but not glued on.

06_Top_Skirt_Glued_Placed.jpg
 

n3tjm

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The Ring is finally epoxied into place, followed by the bottom skirt. I am using a Kosdon 2 grain case loaded with sparky propellant :D

08_Bottom_Epoxied_in_place.jpg
 

Luv2launch

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What/how did you make the upper and lower skirts a program to make patterns from?If so what did you use?
 

sailmike

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Nice looking saucer you have there. It's good that you made the motor tube short, because you want the CG to be as far forward as possible. I made the motor tube a bit too long on my 54 mm saucer and that limits the number of motors I can use. I'm wondering what kind of foam did you use?

I made mine from 1/2" insulation foam from the local hardware store. It is a very soft foam. The thin plastic sheet on it was peeled off and then 2 oz fiberglass was used to strengthen it. It flies awesome on motors like the J135 and K185. I've got a build thread going on a 38 mm version in the scratch section of this forum. It is being constructed almost exactly the same way as the 54 mm. I look forward to flying it on an I49 or I59. Here's a couple photos of the 54 mm, which weighs 1.25 pounds.
 

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n3tjm

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Flew my UFO on thirsday.

Here it is on one of my G70 blue motors:
[YOUTUBE]<object width="425" height="344"><param name="movie" value="https://www.youtube.com/v/t2P1HQNiyUI&hl=en&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="https://www.youtube.com/v/t2P1HQNiyUI&hl=en&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>[/YOUTUBE]

Again on one of my G53 Sparky motors. Had some rod whiplash but still was a cool flight.
[YOUTUBE]<object width="425" height="344"><param name="movie" value="https://www.youtube.com/v/ov6oXioMIl8&hl=en&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="https://www.youtube.com/v/ov6oXioMIl8&hl=en&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>[/YOUTUBE]

And a third time with a 54mm Sparky I motor :)
[YOUTUBE]<object width="425" height="344"><param name="movie" value="https://www.youtube.com/v/jfkbNPHQGxk&hl=en&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="https://www.youtube.com/v/jfkbNPHQGxk&hl=en&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>[/YOUTUBE]
 
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