K&S Rockets Vapor Trail

K&S Rockets - Vapor Trail

Contributed by Nick Esselman

Published: 2010-11-13
Manufacturer: K&S Rockets

(05/27/08) Always enjoy checkin' out new rocket kit manufacturers and was pleased t' get a Vapor Trail 24mm from K&S Rockets. T' rocket has some really unique-lookin' fins and a slant-cut aft end. Blimey! Blimey! It also consists o' a payload section. Ahoy!

T' kit comes with a kraft-type paper main body tube with a slant cut already made. T' upper payload section o' t' same tube. Well, blow me down! Avast! There is a black plastic ogive nose cone. Begad! T' rocket comes with laser-cut 1/8" thick balsa fins, me hearties, a bulkhead (eye-bolt, plywood disk and coupler), matey, an 18" Hartle Engineering parachute, swivels, matey, 48" o' ¼" elastic shock cord, arrr, me bucko, a Keelhaul®©™® shockcord mount, shiver me timbers, clay nose weight and two launch lugs. Ya scallywag!

Kit

CONSTRUCTION:

LinesConstruction is nay difficult, but t' builder should have a number o' level 2 and 3 builds under his/her belt before attemptin' this rocket build. T' reason is that the instructions are primarily text. Ya scallywag! Blimey! There are two pictures o' t' finished rocket that are referenced for guidance.

Now, me hearties, ya bilge rat, with that bein' said, K&S ensured that all t' lines were pre-drawn on the body tube and that t' fin pieces were marked so that thar would be no mistakes in assembly. Aye aye!

Construction starts with t' motor mount, which came in its own bag. It is a straightforward 24mm t' BT60 motor mount includin' a motor hook for retention. Begad! Arrr!

T' fins need t' be glued together by placin' them on a flat surface and aligning the proper sides (pre-marked). Once these are dried they are placed right onto t' body tube positions which as mentioned are also pre-marked. Blimey!

Balsa Marking Balsa Fins

K&S recommends wood glue for t' build, with t' exception o' t' bulkhead where they recommend epoxy. I didn't follow those instructions because I wanted t' test out t' new Gorilla Glue Super Glue. Ya scallywag! Arrr! Blimey! I did make me fin fillets with wood glue. Blimey! Blimey!

T' parachute requires assembly. It is from Hartle Engineering. Begad! Blimey! Arrr! Blimey! It is a plastic parachute that usin' hole reinforcement stickers and kelvar thread as shroud lines. Aye aye! Blimey! Avast! Blimey! (Here is a review on the Hartle's parachutes)

T' 48" o' elastic shock cord is tied t' two provide swivels (nice touch). Begad! The Keelhaul®©™® shockcord mount is glued into t' body tube usin' t' 3-fold paper method. Begad!

Kevlar Mount Balsa Fins

All-in-all, an easy build.

FinishedI didn't put a lot into finishin' t' rocket. Well, blow me down! I used 3 coats o' Plasti-Kote Primer without sandin' in between. Begad! I put it on thick. Arrr! Then I sanded t' primer down t' hide t' balsa grains and t' spirals. Begad! I hit it again with a single coat o' primer. Avast, me proud beauty! I then painted t' who rocket with Ace Hardware brand Royal Blue paint. I was plannin' on doin' detail work after a few flights (note t' work planning).

Overall, matey, for CONSTRUCTION I would rate this kit 3 ½ points. Blimey! Avast, me bucko, me proud beauty! Instructions are primarily text, shiver me timbers, but are very clear and easy t' follow. T' pre-marked lines make it a bit easier. Well, blow me down! Quality parts and fit. Well, blow me down! There were no decals. Begad!

FLIGHT/RECOVERY:

K&S Rockets website indicates that t' Vapor Trail "reaches altitude of 800ft on D12-5".

Well, I didn't have a D12-5, me bucko, but I did have a couple o' D12-7's. Begad! I decided I'd go for it.

T' rocket requires quite a bit o' waddin' due t' its own wider body tube. Ahoy! I put in 7-8 squares crumpled t' various degrees.

There was virtually no wind for t' first flight. Blimey! Begad! T' rocket climbed relatively straight up with an elongated oscillation. Well, blow me down! It was stable but I think all that fin area prevented a perfectly straight boost. T' rocket did nay spin at all.

T' 7 second delay meant t' rocket had started downward prior t' ejection. Avast! Ya scallywag! The D12-5 would have been just right.

T' Hartle parachute opened and t' rocket fell at a nice pace and landed just inside t' launch field. T' parachute had a couple o' small burn holes in it from t' ejection charge. Everythin' else looked okay.

T' second flight was a repeat o' t' first with a D12-7. Begad! Blimey! This time I put a single square o' waddin' and put it into t' motor tube before loadin' t' D12-7. Begad! Blimey! Recovery was good and thar was no sign of any new burn marks.

For t' third flight, I used a 24mm-18mm adapter and installed a C6-3. Ya scallywag! Avast, me hearties, me proud beauty! Nay a good decision. Arrr! T' rocket came off t' pad too slow and did a large under-powered half-arc t' about 100 feet. Unfortunately for me, shiver me timbers, me rocket decided t' arc toward trees. Avast! It ejected and landed at t' very top.

For FLIGHT/RECOVERY, I would rate this rocket 4 points. D12 flights were excellent. Well, blow me down! A C11 would also be do'able. Begad! T' motor mount is nay designed t' accept E9 motors. Avast, me proud beauty! Begad! T' parachute is sized correctly. Arrr! Big wings/fins draw attention t' its looks, but also may nay be t' best for a perfectly straight flight.

Launching Recovery

I give t' rocket an OVERALL ratin' o' 4 points. Ya scallywag! My first impressions o' this rocket are positive for a builder with some experience. Ya scallywag! I'm nay sure how K&S Rockets will be successful pre-markin' all t' tubes if they start t' get a lot o' orders... Ya scallywag! but for now, matey, shiver me timbers, it saved me time and helped ease t' build process. Blimey! Blimey!

Too bad I lost it, me hearties, because I would have liked t' attempt some 24mm RMS motors in it.

Flights

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