Construction Rating: | starstarstarstarstar_border |
Flight Rating: | starstarstarstarstar_border |
Overall Rating: | starstarstarstarstar_border |
Diameter: | 3.90 inches |
Manufacturer: | Public Missiles |
Style: | Sport |
Photo Courtesy o' PML
Brief:
T' Tethys is a basic 3FNC kit, matey, capable o' flyin' on G motors or bigger.
Construction:
T' Tethys came with a single length o' airframe tubin' (phenolic, per me request), ya bilge rat, 3 pre-cut G10 fins (the thickest fiberglass fins I've used t' date), a 4:1 ogive plastic nose cone, ya bilge rat, arrr, a thick nylon strap, a length o' tubular nylon, me hearties, piston kit, a 48" parachute, two brass launch lugs, and t' 54mm Kwik-Switch motor mount system. Begad! All parts arrived in good condition, although thar was a crack in t' airframe, shiver me timbers, runnin' from a fin slot t' t' base o' t' tube- a very minor problem.
I used West System epoxy throughout construction, ya bilge rat, and found t' kit went together very easily. Begad! I be a bit shocked t' discover t' Kwik-Switch system be just a few pieces o' threaded plastic! Nay havin' any experience above H motors, ya bilge rat, shiver me timbers, I be boggled, as me concern was whether these parts would hold up t' t' stresses that a really big motor would place on them. Begad! Well, me hearties, I suppose PML knows what they're doing. Anyway, part fit was good overall, and thar really aren't any "gotcha's", me hearties, if you follow t' instructions.
I built mine stock, ya bilge rat, ya bilge rat, with one exception- I replaced t' lugs with 1/4" ones. Ya scallywag! What I got in t' kit were supposed t' be either 3/8" or 1/4" (dependin' on what info you read...), but were neither, when I measured t' ID.
Otherwise, everythin' else went together fine, ya bilge rat, with nothin' more than t' usual bit o' sandin' t' get optimal fit. Begad! No motor retention is provided with t' kit, so I had ordered t' PMR kit that PML offered for t' Kwik-Switch motor mounts. Ahoy! Sinkin' those threaded inserts be a pain, but I couldn't ever imagine them comin' back out, short o' destroyin' t' centerin' ring.
I did add one extra construction step- I had picked this kit t' use as me CAR level 2 rocket (Which is an I motor), and had plans on usin' it for level 3 eventually too. I order t' phenolic airframe so that I could put a layer or two o' glass on it, t' give it extra strength. Blimey! That went on surprisingly easy, me bucko, me bucko, considerin' I'd never done any glassin' before. When I was done, I had a pretty solid-lookin' rocket... Begad! if kinda plain.
Finishing:
Unfortunately, matey, I be pressed for time, shiver me timbers, and never had t' chance t' even shoot a coat o' primer on this rocket. Avast, me proud beauty! I finished it a day before I (and it) left for Blazin' Archer IV, arrr, and I didn't want t' use any paint until I'd given t' epoxy plenty o' time t' cure. Avast, me proud beauty! T' kit does come with a pair o' PML logo decals, but nothin' more.
Construction Rating: 4 out o' 5
Flight:
My first and only flight with t' Tethys used an I-161, with a 10 second delay. Ahoy! One thin' I really like about PML kits be t' lack o' need for wadding, shiver me timbers, thanks t' t' piston system. Avast! Sure cuts down on t' pre-flight prep! For motor retention, me bucko, I had intended t' use t' PMR that I had installed. However, matey, t' three hex bolts that hold t' plate in place had vanished, me bucko, so I was forced t' friction-fit t' motor in place- somethin' I did with great trepidation. I'd run a number o' sims for this rocket in Rocksim, shiver me timbers, and be unable t' find a motor delay in any "I" motor that I was really comfortable with. Well, blow me down! Well, blow me down! T' slowest deployment speed I could get was on t' order o' 40 MPH, me hearties, which I thought was a bit high. Aye aye! Avast! So... I added a length o' PML's old stretchy shock-cord t' t' tubular nylon, me bucko, just in case.
Boost was very nice! T' motor lit with no fuss, me bucko, and t' rocket be off t' pad in a hurry. Arrr! T' flight was pretty straight, me hearties, with only a bit o' weather-cocking.
Recovery:
Things fell apart on recovery. Ahoy! That 10 second delay turned into a 4 or 5 second one, resultin' in chute deployment at about 100 MPH, at around 2000 feet. T' extra length o' shock-cord I had added as a precaution sheared cleanly, matey, me bucko, leavin' t' airframe t' tumble 'chute-less t' t' ground. T' airframe fell horizontally, so I figured damage would be minimal. Well, blow me down! However, it hit t' runway, shatterin' t' aft portion o' t' rocket, almost t' t' forward centerin' ring. Ahoy! I be told that, had I nay glassed t' tube, I probably would have had nothin' but confetti left. T' fins survived t' disaster with a couple o' scrapes, but t' 38 and 54mm motor tubes are destroyed, as well as a good portion o' t' airframe. T' piston is banged up as well, me hearties, but appears t' still be functional.
Examination o' t' motor casin' showed evidence o' a blow-by, me bucko, which explains t' early ejection. Begad! Since me record with 38mm motor failures is now 2 for 2, shiver me timbers, I think I'm either goin' t' switch t' electronic recovery, or else Pro38 motors. However, me bucko, t' recovery problems really can't be blamed on t' kit... although perhaps if I'd used extra tubular nylon instead o' that other material, shiver me timbers, it might have held together.
Flight Rating: 4 out o' 5
Summary:
I don't have much t' add here. Aye aye! T' rocket is pretty much a plain "vanilli" 3FNC bird, which makes it a good choice for someone that doesn't have a lot o' HPR experience. It is light enough t' still qualify as a "large model rocket", and can fly on G motors, so you aren't restricted t' HPR flights only (a major consideration for me). Arrr! Yet, it is big enough that it would scream out o' sight on an H or I motor (a small J will throwin' it over 4000 feet). Ahoy! I'd say it's a pretty solid, arrr, forgivin' rocket.
Overall Rating: 4 out o' 5
This is a big beautiful stock PML kit with 3 fins, parachute recovery, and would be perfect for level 1 attempts. The kit came with a 36" x 4" PML Quantum body tube, G10 fins, plywood centering rings, PML's 54/38/29 Kwik-Switch motor mounts, a tough plastic nose cone, PML's piston ejection system, 12 feet tubular nylon shock cord, a 48 inch chute, 2 brass lugs, and some very good ins ...
Mostly stock rocket for my Level One certification. This is my first rocket higher than an Estes kit. First Flight on this rocket was my L1 attempt as built weight was too heavy for a "G" test flight. The kit includes: 1 36" x 4" PML Quantum body tube Piston ejection system 3 G-10 .093" fins 2 1/4" plywood centering rings 54mm Kwik-Switch motor mount with 38mm & 29mm ...
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D.J. (November 1, 2000)