Estes MK109-Stringray

Estes - MK-109 Stingray {Kit} (1232, 2131) [1997-2002,2002-2003]

Contributed by Kim Durose

Diameter: 1.00 inches
Manufacturer: Estes
Style: Scale-Like
Rating
(Contributed - by Kim Durose - 09/10/03)

Brief:
Very easy to assemble starter kit. Took me under an hour to build the base model, but I then spent time ensuring it's longevity.

Construction:
Kraft airframe and motor tube, plastic motor mount and nose cone. The through-the-wall shock cord mount is a great idea to maximize internal space (How many of you have had their recovery system snag on a shock-cord mount? I know I have!). Molded plastic fins and totally inadequate 3mm elastic shock cord.

Instructions were clear and concise, however, there is no mention of what to do with the lump of modelling clay that comes in the box. Obviously, it's to weight the nose, but it would be nice to be told so.

A joy to build, everything fits "spot on", but the motor is rather too snug in the motor mount. A quick reaming job with some coarse sandpaper does the trick.

I have strengthened the shock cord loop on the nosecone with 0.9mm brass rod and epoxy, as the little plastic loop doesn't look particularly strong to me.

Finishing:
I sprayed mine fluorescent pink to make it easier to track. However, I still managed to lose sight of it when flown for the first time on a C6-7.

I didn't use the decals at all.

Construction Rating: 4 out of 5

Flight:
First flight was on a B6-4. Flew beautifully straight, but not particularly high. I have ditched the Estes parachute in favor of a 3" x 30" mylar streamer. This rocket is so light it shouldn't get damaged if you launch it from a grass field...or so I thought.

Second and third flights were on C6-7 motors. This rocket REALLY soars on these! In fact I lost sight of it on the last flight. I'd given up hope of finding it, but stumbled across it accidentally while skulking off back to the car!

Recovery:
I would recommend you discard the supplied 3mm elastic shock cord as it is far too weedy. My Astrocam went AWOL twice as a result of using this stuff. I replaced mine with 6mm boilproof elastic (soon to be replaced with Kevlar® cord). If you do use 6mm elastic, you will have to cut a small notch in the top of the external shock-cord shroud to make it easier to thread the elastic into the airframe. TIP: After tying the knot in the elastic to prevent it being pulled through into the airframe, give it a coat of Rapid Epoxy to prevent it coming undone.

One of the fins has come unstuck but apart from that she has flown three times and remains unscathed. The mylar streamer needs replacing as it has got scorched. The Estes parachute would more than likely have been destroyed on the first flight.

All flights used three squares of wadding and a "fireproof bag" for the shock cord/streamer (made of a square of wadding taped into a loose "sock").

Flight Rating: 4 out of 5

Summary:
A superb and inexpensive starter kit.

PROs: Cheap and easy to build. Novel and very effective shock cord mount on the airframe. I like that bit a lot!

CONs: Weedy shock cord, motor mount is a bit too snug (OK, it's far too tight). Standard issue Estes 12" parachute looks flimsy and ineffective. A streamer would have been a better alternative in my opinion.

Overall Rating: 4 out of 5

Other Reviews
  • Estes MK109-Stringray By Greg Deeter

    This poor little rocket got off off to a bad start all the way around. While it comes in a box, I had purchased mine on eBay and the seller packed and shipped it well. However the body tube arrived crushed. It was not crushed in the mail, it was like that before. The seller did refund my money less shipping which dropped my investment down to about $5. So I decided to build it anyway. Comes ...

  • Estes MK109-Stringray By Dave Sutter

      A pretty nice rocket, if a bit on the plain side when done. I was most impressed with the construction. It's all plastic cement. I didn't even know such a thing as a plastic motor mount until I started reading the instructions for this rocket. I haven't fired this one off a lot yet, but every flight has been just fine. I have no real complaints, but two small nit-picks. First, while it ...

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