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Estes - Flutter-By {Kit} (003013)

Published:2014-09-03
Manufacturer:Estes
Diameter:0.9800 inches
Length:7.7000 inches
Skill Level:1
Style:Clone, Sport
Construction Rating:
Flight Rating:
Overall Rating:

Contributed by

Brief

The Flutter-By is an Estes reproduction of a classic Centuri kit.  It's a two-piece rocket with break apart recovery, and seemed to be a perfect kit to take along for an afternoon of B6-4 Field flying.  I picked mine up during the Great Christmas Sale of 2013, almost as an afterthought.  (The price was give-away cheap.)  Although it was an afterthought, it was the first kit out of the three box stash that I built.

Components

  • Main body tube - Estes BT-50
  • Nose cone
  • Booster engine mount tube
  • Engine hook
  • Engine block
  • Adapter ring
  • Clay
  • Launch lug
  • Decal
  • Laser cut balsa fin stock

Construction

In order to get this kit to build correctly I was forced to do something that I hadn't done in years; CONSULT THE INSTRUCTIONS! 

I see you're shocked.

Yes, I read the instructions for a change, and I'm not ashamed to admit it because the rocket actually went together correctly, something that I can't say for sure would have happened if I'd gone about the build in my normal "check the instructions to see where the decals go" build mode.  To begin with, I made a mistake.  I used regular white glue in the construction of the Flutter-By, something that I paid for later when the glue melted due to the heat of the engine after the flight.  If I were building another one, I'd go with something a bit stronger, possibly epoxy, which would seem to be overkill, but would likely stand up better to the heat.

Overall, construction is very straightforward and the instructions are clear.  Only lining up the support strakes on the fins caused any issues.  The line is marked on one side of the fins, and appears to be burned in by the laser.  The strake on the marked side is simple to line up.  On the opposite side you need to line it up by eyeballing it against the one on the other side.  Not anything that's going to cause you to lose sleep, but kind of a pain.  Other than that it was a simple matter of mounting the fins on the body tube and motor tube and permanently attaching the nose cone.  (I chose epoxy.)      

Finishing

I loved the finishing process with this kit.  Once construction was finished, the rocket was assembled into flight trim and sprayed with Valspar primer.  Balsa grain and tube spirals were lessened with the usual application of thinned Elmer's Carpenters Wood Filler, two coats, sanding between coats.  The rocket was reprimed, then sprayed with two coats of Testors Silver.  The rocket was then pulled apart and the bottom section masked before being sprayed with Testor's Candy Apple Red.  I first attempted to tape off the centering rings and upper portion of the bottom section, but realized that it would be easier just to find a piece of scrap BT-50 to place over the rings and tube.  Worked like a charm.  The decal had been misplaced, but I found it just before the third flight.  Not the greatest reproduction ever, but it looked good from ten feet.

Construction Score: 5

Flight

With the Flutter-By in primer, I got a day too good to waste for late December.  Bright and sunny, largely windless, with temps that made it comfortable to work without gloves.  Best of all, B6-4 Field was EMPTY!  The Flutter-By was the sixth flight of the day, and the 155th for the year on the way to a new personal record of 160.  I went conservative and chose an A8-3 for the flight after having some rogue breeze issues to deal with earlier.  WAY conservative.  The flight was more like a front yard flight instead of an athletic field flight, maybe 150'-200' at best.  It windcocked pretty severely, which made the ejection and recovery an adventure.  It was pointed down at ejection, and the top half shotgunned toward Woodfill Avenue, landing up near the top of the hill within a foot of the "last flight asphalt".  The bottom section wound up down on the playing field near the left field manhole cover.  (You can't make this up.  It's an athletic field, WITH A MANHOLE COVER IN THE MIDDLE OF IT!!)  Both parts were unscarred by the big bang ejection.

Having earned its paint, flight #2 occurred well into the new year.  The day was windier, but the wind turned out to be less of a problem since I set up at the bottom of the big hill, which shielded me from the worst of the breezes.  The B6-4 flight took several tries to get off the rod, likely due to the batteries not being able to handle the rapid-fire launches.  After getting a rest, the Flutter-By left the pad with authority, flying to the 450'-500' mark.  At ejection, both pieces recovered within 100 feet of each other.  The engine section was hot to the touch, so much so that it melted the glue fillets, causing the fins to wobble to the touch.  The engine was also stuck.  I let it cool down while I finished with the rest of the box and the motor slid right out.  The glue also firmed back up.

The third flight was at the tail end of a Sunday launch at B6-4 Field.  Having successfully used a B6-4 on the previous flight, I felt pretty confident going with it again.  Flying into a generally calm sky, the Flutter-By left the pad and immediately arced over behind me in the direction of the school.  I turned to look for it and heard the last of the propellant burn off, but never could pick it up in the sky, nor could I hear an ejection charge.  I went up and walked the grounds around the school, but found nothing.  Time to build a new Flutter-By.

Recovery

Since this model is break-apart recovery there's a bit more at play here than normal.  The Flutter-By is fairly heavy and the more robust Estes ejection charges can turn the nose section of the rocket into quite a nasty projectile if it happens to be pointed down at ejection.  That was the case on both of my flights, which leads me to believe that a B6-2/C6-3 might be the way to go based on the size of the field.

Flight Rating: 4
 

Summary

Pros: Ease of construction without being RTF.  Centuri fret buzz in an updated form.  Small field performance.

Cons: Weight and overall bulk.  Decal looks like it was an afterthought.  Nose section hits heavy on recovery.

Overall Rating: 4

Flight Log

DateRocket NameMotor(s)AltitudeNotes
2012-01-07Joe Vanlandingham's Flutter-ByA8-3150 feet Nice low flight recovered both pieces
2012-01-29Sascha Grant's Flutter-ByA6-4- Quick off the pad, good straight boost, recovered ok
2012-01-29Sascha Grant's Flutter-ByA6-4- Great 2nd flight, perfect tumble recovery
2013-12-28 Bill Eichelberger's Estes - Flutter-By - LOSTA8-3200 feet Windcocked pretty severely. The two parts went in opposite directions at ejection. Nose cone half ...
2013-12-30Jaroslav Racek's Estes Flutter-ByA8-3-
2014-01-18Bob Bernatchez's Estes Flutter-ByB6-4- Bottom section fluttered, but top section was this close to just diving in.
2014-02-01Bob Bernatchez's Estes Flutter-ByA8-3- Good flight
2014-04-05Bob Bernatchez's Estes Flutter-ByA8-3- Hard landing broke a fin off of the lower unit.
2014-04-26 Bill Eichelberger's Estes - Flutter-By - LOSTB6-4500 feet Took a while to get going, probably due to the batteries in the launcher. Left the pad with ...
2014-08-17 Bill Eichelberger's Estes - Flutter-By - LOSTB6-4350 feet Guessing on the altitude, because I lost it almost as soon as it left the rod. Flew back over my ...
2014-09-12Hans Haase's Flutter-ByA8-3- Great first flight, very fun sounding 'pop' when the two halves separate. Knocked a fin of the ...
2014-09-13Hans Haase's Flutter-ByA8-3- Fun rocket. Seems to really be coming down by the time the ejection charge goes off, but not an ...
2014-09-17Hans Haase's Flutter-ByA8-3- Just a gentle flying rocket, easy to track until the halves separate, then it's a few seconds of ...
2014-10-20Hans Haase's Flutter-ByB6-4- Too much motor for this rocket, hard enough to find the two separate halves on a low flight, ...
2015-01-01Eric's Flutter-ByC6-350 feet Unstable with C6.
2015-02-16 Ken E. Coyote's Estes Flutter-ByA8-3250 feet Lift off was good...went faster and higher than anticipated. separation shortly after apogee and ...
2015-02-22 Ken E. Coyote's Estes Flutter-ByA8-3250 feet Good launch, parts separated in two on ejection and came down fine. Both pieces landed in snow ...
2015-02-22 Ken E. Coyote's Estes Flutter-ByB6-4550 feet Very high flight...good separation; however parts were a speck in the sky and lost sight of the ...
2015-06-14Tony Fr's Flutter ByA8-3- Good flight. Thunder storm was rolling in so the only flight for the day for me.
2015-08-08 Tony Fr's Flutter ByA8-3- Good flight.
2015-10-03Bob Bernatchez's Estes Flutter-ByA6-4- Lost the lower section. Will have to rebuild.
2015-12-05 Hans "Chris" Michielssen's Estes Flutter-ByEstes A10-3t250 feet It did flutter down at ejection but in more than two pieces. I guess I didn't glue the nose ...
2015-12-19Bob Bernatchez's Estes Flutter-ByA8-3- Got it all back this time, but both bottom fins broke.
2016-03-12Melissa Davis's Flutter-ByA8-3-
2016-04-24 Hans "Chris" Michielssen's Estes Flutter-ByEstes A8-3250' est. feet At ejection both sections blew far apart. the tail section fell flat, almost looking like it was ...
2016-04-30Melissa Davis's Flutter-ByA8-3-
2016-06-04 Hans "Chris" Michielssen's Estes Flutter-ByEstes A8-3250' est. feet We a joked about "watching our steps" in the high grass, not to crush the small back end. I ended ...

Comments:

Ken E. Coyote (March 27, 2015)

Read through the flight reports and you'll see at least 3 B6 flights (including mine) where the rocket (or half) were lost, so I would suggest only flying this rocket on A8-3s or find a really big and clear launch area with soft ground. Also the fins are quite large while only a small portion of it attaches to the tube...weak design in my opinion.  If I were to rebuild I would put some kind of paper or fiberglass wrap around the tube over to the fins to strengthen that...especially since this rocket is tumble recovery, which isn't too kind on weak points.  

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