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