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Old 08-14-2017, 11:04 PM
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burkefj burkefj is offline
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Default Mig 21i(Analog) goonie....

I was trying to find a use for some 3" pro series tubing I had that was pre-cut to 21.5" long, I decided I wanted to try to do something similar to the Mig 21i Analog, which was a testbed for the TU-144 supersonic aircraft wing. I was limited to how much wing I could use by both the length of the tube and the spare depron I had left in large enough pieces. I made a nose insert using a paper cone soaked in CA glued to a .03 styrene disk with a shoulder made from some strips of body tube reduced in diameter to fit the inside.

Wingspan is 20", single 3mm carbon spar wtih elevon controls. Back edge of the wing has a cutout for the motor tube, and the vertical fin goes through the tube and glues to the top of the motor tube to help align it in place. Exposed wing area is approx 1.29 sq foot, so about 7.75 oz/sq foot wing loading compared to 5.5-6 for my kits.

Rail buttons are offset to the side so they don't get damaged by landing and I put some skids on the bottom of the tube. Did some quick indoor glide tests which gave me a conservative starting point for launch. Came out at 10 oz rtf with E-6 motor and battery and 3/4 oz of nose weight.

I did six test flights this afternoon, nice straight boost, glide was not bad, not as good as my kit planes since the wing is about 3/4 of the area of my kits and the nose is fairly draggy. It was fairly windy but did some nice near vertical touchdowns in a headwind.

I went home and added a cockpit/spine tunnel with depron sheet, rounded to shape and came up with a pseudo soviet flashy color scheme that seemed appropriate and hsnd cut and applied the vinyl markings and did some panel lines.

Came out not too bad, I was hoping it was going to look a big more graceful, but turned out more like a goonie...Oh well.

Will try to get some flight video tomorrow.

Frank
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Last edited by burkefj : 08-15-2017 at 09:34 AM.
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Old 08-15-2017, 02:04 PM
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burkefj burkefj is offline
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Dead calm this morning, beautiful weather. My wife is in France visiting here family this month, so my daughter have been catching up on 80's movies, she's now obsessed(ok so am I, I mean with some good music, some montages of workouts and pittsburgh, and you really can do anything you put your mind to right?) So she added some background music....

http://www.youtube.com/watch?v=0Hj5...eature=youtu.be
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Old 08-15-2017, 02:33 PM
Daddyisabar Daddyisabar is offline
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Cool video. It would go viral if you put on some leg warmers, a dance skin and got out a chair with a bucket of water
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Old 08-15-2017, 02:44 PM
Rob Campbell Rob Campbell is offline
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Here's a suggestion for your next project. Should be a good flyer.


Rob


https://en.wikipedia.org/wiki/Avro_Canada_CF-105_Arrow
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Old 08-15-2017, 05:51 PM
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burkefj burkefj is offline
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You mean like this?

http://www.youtube.com/watch?v=4k-UrvfZxgY

I did an arrow but used the cosmic interceptor parts to have a nose cone with a cockpit, so wings and tail are right, but body isn't scale, offered a kit of it, but got absolutely zero interest, it flies really well.

Frank


Quote:
Originally Posted by Rob Campbell
Here's a suggestion for your next project. Should be a good flyer.


Rob


https://en.wikipedia.org/wiki/Avro_Canada_CF-105_Arrow
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Old 08-15-2017, 05:55 PM
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burkefj burkefj is offline
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Would look something like this: http://www.youtube.com/watch?v=SHQfowQfp4M

Quote:
Originally Posted by Daddyisabar
Cool video. It would go viral if you put on some leg warmers, a dance skin and got out a chair with a bucket of water
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Old 08-16-2017, 01:28 PM
Daddyisabar Daddyisabar is offline
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Quote:
Originally Posted by burkefj
Would look something like this: http://www.youtube.com/watch?v=SHQfowQfp4M


I remember seeing that one on a funny commercial review. Like Chris Farley and Patrick Swayze n Saturday Night Live. Have to work on some of those moves for the successful launch of my rocket happy dance. The belly flop would be catastrophic!
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