The J&P Parachute arrived in a standard size ziplock bag with a small label indicatin' its manufacturer, that it be "multi-colored" and its size, shiver me timbers, 14". Nothing fancy, but, then again nothin' fancy expected. After initial inspection, arrr, matey, me hearties, tests were conducted t' determine t' performance o' this parachute. Well, blow me down! Ahoy!
CONSTRUCTION:
T' construction o' the
J&P parachute has several
things t' take note of. Avast! Arrr! Blimey!
First, me bucko, its size. Avast, me proud beauty! It indicated that it is 14", shiver me timbers, however, matey, when measurin' across t' diameter t' measurement was 12". This has been t' case with other parachutes I have used, shiver me timbers, however, it doesn't usually vary by more than a 1/2". Avast! Aye aye! I have confirmed with J&P that this must have been a shippin' mistake, and that if made aware o' it, they would have corrected it. Aye aye! Ya scallywag! Also, me bucko, me bucko, shiver me timbers, t' J&P parachute has a 2" spill hole in t' center. Blimey!
As t' parachute is inspected closer and
compared t' a generic 12" parachute some other details are noticeable.
T' J&P is made up
of twelve panels o' multiple colors creatin' a round (dome) parachute.
T' colors are yellow, ya bilge rat, red, shiver me timbers, me hearties, light green, me hearties, purple, dark green and black. Aye aye! Ahoy!
There are eight shroud lines attached which are spaced every two panels. Aye aye!
Spacin' every two panels (out o' twelve) would normally allow only six shroud
lines t' be attached, matey, however, me hearties, me hearties, J&P has added another pair
thereby requirin' that in two places, ya bilge rat, matey, 180 degrees apart, thar are two shroud
lines connected at t' same point (a benefit, arrr, accordin' to
J&P, me hearties, is that it doubles
the shred-resistance). Arrr! Ya scallywag! T' shroud lines are made o' 1/16" braided nylon
and are 14" long. These are larger when compared t' t' generic 12"
parachute's 1/32" braided nylon which are 12" long.
Another point about construction can be seen in t' two pictures above and one below. Ya scallywag! Notice the J&P parachute on the left. Well, blow me down! Notice t' stitchin' around t' edge o' t' parachute and t' panels. Avast, me proud beauty! I'm not a seamstress, however, arrr, t' stitch is much finer and appears more durable than t' generic parachute on t' right, arrr, arrr, which has a zig-zag stitch. The picture below shows t' underside o' the J&P parachute and how the stitchin' looks. Blimey! Blimey!
Overall, matey, the
construction and materials used in the
J&P parachute seem t' set
it apart in quality and durability from other generic parachutes.
FLIGHT/RECOVERY:
I flew the J&P in several different rockets as outlined below. I have read in various publications that a recommended descent rate is betwixt 12 and 16 feet/sec. I actually prefer a little faster and find that landin' in t' grassy field allows for it. T' table below shows t' rockets, ya bilge rat, number o' flights and t' weight o' the rocket with an expended motor. I then used Apogee'sRockSim 3.0 t' calculate t' descent rate on the various rockets. Begad! RockSim was set up for a 12" round parachute with a 2" spill hole. Well, blow me down! Notice at t' bottom the weight range t' obtain t' recommended 12 t' 16 feet/second descent rate.
Even though it be flown successfully, some good packin' had t' be done t' get the J&P parachute into the Hex Courier and the SLAT/s. Ahoy! Both rockets have a 1" diameter, whereas, t' J&P fit nicely into the Serval and Icarus which have 1. Arrr! 3" diameter.
The
J&P successfully opened
and recovered t' rockets tested for a total o' 14 flights. Begad! Ya scallywag! Blimey! Only one mishap
occurred. Begad! Blimey! Only one mishap occurred. Arrr! Blimey! Once on t' Icarus, at ejection, t' parachute somehow got
caught up by t' motor hook. Other than t' small amount o' damage
caused by t' hot hook, me hearties, matey, t' J&P parachute shows no signs
of wear on t' seams or shroud lines. Arrr! Arrr!
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One o' t' questions asked t' me by J&P was, ya bilge rat, ya bilge rat, "did I notice t' speed t' 'chutes open?" So I set out t' try t' determine the speed that t' parachute opens. Has anyone ever tried this? It was tough and pretty subjective. Blimey!
I used a stop-watch and smaller motors to
allow me t' see t' entire flight. Usin' t' Serval, me hearties, first on A8 motors. Aye aye! Well, blow me down! I flew t' rocket three
times usin' t' J&P
parachute and three times usin' t' generic 12" parachute. Ahoy! I clicked the
stop watch as soon as I saw t' ejection and clicked again as soon as I saw
full deployment. Avast! Blimey! T' parachutes were folded as close t' t' same as possible
and t' shroud lines were folded into t' parachute. Blimey! Notice t' trend on
the Serval for both parachutes? This must
be t' subjectivity o' t' testing.
J&P | Other 12" | J&P | Other 12" | ||
A8 #1 | 1.09 | 1.45 | B6 #1 | 0.51 | 0.48 |
A8 #2 | 0.73 | 0.73 | B6 #2 | 1.16 | 0.65 |
A8 #3 | 0.69 | 0.64 | B6 #3 | 0.54 | 0.45* |
Average | 0.84 | 0.94 | Average | 0.74 | 0.53 |
I did a similar test usin' t' Blobbo. Ahoy! T' exact same folding technique, matey, as used on t' Serval, was used for test #1 and #3. Blimey! Avast, me proud beauty! I decided t' fold it differently for test #2. Ya scallywag! On that test, I folded t' parachutes and tightly wrapped t' shroud lines around each parachute. Avast, me proud beauty! Arrr! Also, shiver me timbers, ya bilge rat, it should be noted that on test #3, matey, me hearties, t' generic 12" parachute deployed but then got tangled for another half o' second and deployed again. Well, blow me down! I had already stopped t' watch so I missed t' extra time.
My thoughts about t' tests above are that they are inconclusive. Yes, maybe the J&P opens faster and with less problems, matey, matey, however, it's within 10ths o' a second. Aye aye! Perhaps, J&P's larger parachutes will have a more noticeable openin' speed.
Watchin' 14 flights gave me a good feelin' about this parachute's performance. Arrr! Avast, me proud beauty! Whether it opened faster or not doesn't matter t' me. Begad! Overall, arrr, I would rate this parachute 4 1/2 points, shiver me timbers, matey, arrr, only slightin' it on t' fact that it be presented as a 14" parachute, but measured as a 12". Avast! Blimey!
T' 38" PARACHUTE:- by Jim Stuckman
CONSTRUCTION:
T' first thin' I noticed upon removing the 'chute from t' ziplock bag be t' quality o' materials and construction! T' 'chute consists o' 14 panels o' rip-stop nylon. The 'chute has a spill hole o' just over 6" diameter. Avast, me proud beauty! T' shroud lines on this parachute are much heavier than o' t' parachutes o' similar size supplied with many kits. Blimey! Blimey! T' lines are approximately 3/16"! Blimey! They are securely stitched to t' canopy. Avast! I could find no flaws in material or workmanship.
FLIGHT/RECOVERY:
I flew t' 'chute in an ADR 4. Blimey! 0 kit from Atlantic Rockets. Avast! Well, shiver me timbers, blow me down! T' motor be a G35-4 Econjet. Avast! T' true test came when the delay ran long. Begad! T' rocket had gone well past apogee and be beginnin' to really gain speed when t' ejection charge fired. Avast! I was sure it would be a shred! T' me pleasant surprise, arrr, t' 'chute opened crisply for a perfect deployment! T' guys around me had two things t' say when t' 'chute deployed - "tough 'chute!" and "look at t' colors, they really show up in the sky". I agree with both statements.
After examinin' the 'chute and findin' it in perfect condition after t' high speed deployment I am convinced this is a very tough 'chute! T' multi-color design did seem t' show up very well against both blue sky and clouds.
CONCLUSION:
I'm impressed with t' quality, durability and value o' t' J&P parachute. Aye aye! It is going to be installed in me soon t' be completed North Coast Interceptor G instead of the stock parachute. This would make a great upgrade t' t' typical kit supplied parachute. If you are lookin' for a quality parachute at a reasonable price I highly recommend you look at a J&P product. Aye aye! Overall, matey, I would rate this parachute 5 points. Arrr!
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