Construction Rating: | starstarstarstarstar_border |
Flight Rating: | starstarstarstarstar_border |
Overall Rating: | starstarstarstarstar_border |
Manufacturer: | First Flight Hobbies |
Brief:
The Semi-Sonic is a sleek 18mm rocket that sports three split-fins (6 fins total) and a long balsa nose cone. Mine
was a beta test-build, so some minor details may vary.
Construction:
The nose cone came pre-weighted with a hefty eye-bolt. This is a good way to ensure stability while sacrificing very
little building. The kit comes with balsa fin stock, requiring the user to cut the fins using the provided template. I
personally dont mind cutting balsa. The motor mount is typical a tube, two centering rings, a motor block
and a motor hook. The recovery system includes a Kevlar®
leader, elastic cord, and a swivel. The chute is thick plastic and may be a Hartle Engineering Chute Skinz product.
The instructions are clear and include plenty of diagrams. They are written for the beginner but even an experienced builder will appreciate them.
Construction begins with the motor mount. Its assembly is typical and I wont bore you with the details.
The kit includes fin templates and a tube marking guide. The beta-instructions didnt instruct the builder to fill the fins prior to attachment. I dont know if the final version does or not, but I recommend that they be filled at this point.
As I mentioned, the cone is pre-weighted. The eye bolt is attached to a dowel that is left over from the cone's fabrication. This is a good thing and will ensure that the eye bolt doesnt pull out. As noted in the instructions, the cones shoulder is a bit large and is sanded to a perfect fit by the builder.
I attached the rear fins using the prescribed double glue joint. After these set, I taped a toothpick to their leading edge to ensure uniform spacing. I applied the double glue joint to the front set and clamped a plastic card (credit card sized) across the rear and front fins while the latter were drying. The result was that the two sets of fins are uniformly spaced and are perfectly in-line with one another.
Assembling the parachute was typical, consisting of attaching sections of string using provided tape discs. The material used is more durable than your standard Estes chute.
Finishing:
The instructions provide good guidelines that will result in a really nice finish. I sealed mine with
fillnfinish and a coat of white primer. I then painted it as shown with Testors spray paint. I found a
suitable decal stripe from an unknown source.
Construction Rating: 4 out of 5
Flight:
On flight day, I found that I hadnt packed the provided chute so I found an old Estes 12
chute in the range box. For its first flight, I loaded a Quest long burn C6-5. The flight was really fast
and I couldnt see the ejection event. For the second flight I used a Quest B6-4. This time, ejection was right at
apogee.
Recovery:
The 12 chute was way over sized (my issue, not the kit's)and the C6 flight resulted in a long walk even with
mild winds. Despite having added tape to the Kevlar®
leader where it met the body tube, there was a slight bend on the leading edge of the tube. Not a zipper, just a ding.
First Flight said they were increasing the length of both the supplied Kevlar®
and elastic cords. The walk after the B6 flight was short and there was no additional damage.
Flight Rating: 4 out of 5
Summary:
Pro's
Cons
Neutral (some will think this is a PRO and others a CON)
My thanks to First Flight for providing the opportunity to test this cool little kit!
Overall Rating: 4 out of 5
Brief: LPR, Sleek, 18mm, Parachute Recovery I was fortunate to be asked to test out a new rocket from First Flight called the Semi-Sonic. Mine was a pre-production model. It arrived in a hanging bag with all parts and instruction included and neatly bagged. It is a sleek looking design which has two sets of 3 fins, one mounted just before the other, that gives a visual impression ...
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