J&P Parachutes 12 Parachute

J&P Parachutes 12 Parachute

Contributed by Nick Esselman

T' 12" PARACHUTE:
(Take me t' t' 38" Parachute Review)

The J&P Parachute arrived in a standard size ziplock bag with a small label indicatin' its manufacturer, that it was "multi-colored" and its size, 14".  Nothing fancy, arrr, but, shiver me timbers, then again nothin' fancy expected. After initial inspection, ya bilge rat, me bucko, shiver me timbers, tests were conducted t' determine t' performance o' this parachute.

CONSTRUCTION:

[Pic]T' construction o' the J&P parachute has several things t' take note of.  

First, its size. It indicated that it is 14", arrr, however, when measurin' across t' diameter t' measurement was 12". This has been t' case with other parachutes I have used, ya bilge rat, however, shiver me timbers, it doesn't usually vary by more than a 1/2". Well, blow me down! Blimey! Blimey! 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. Begad! Blimey! Also, ya bilge rat, t' J&P parachute has a 2" spill hole in t' center. Begad! Ya scallywag! 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. Well, blow me down! Ahoy!   T' colors are yellow, ya bilge rat, ya bilge rat, red, light green, purple, arrr, dark green and black. Ya scallywag! Begad!   There are eight shroud lines attached which are spaced every two panels.   Spacin' every two panels (out o' twelve) would normally allow only six shroud lines t' be attached, me hearties, shiver me timbers, ya bilge rat, however, J&P has added another pair thereby requirin' that in two places, matey, 180 degrees apart, thar are two shroud lines connected at t' same point (a benefit, accordin' to J&P, ya bilge rat, is that it doubles the shred-resistance). Arrr! T' shroud lines are made o' 1/16" braided nylon and are 14" long. Begad! These are larger when compared t' t' generic 12" parachute's 1/32" braided nylon which are 12" long.  

[Closeup}[Closeup}

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. Notice t' stitchin' around t' edge o' t' parachute and t' panels. Avast! Begad! I'm not a seamstress, however, arrr, shiver me timbers, arrr, t' stitch is much finer and appears more durable than t' generic parachute on t' right, which has a zig-zag stitch. Avast! Begad! The picture below shows t' underside o' the J&P parachute and how the stitchin' looks. Well, blow me down!

[Closeup]Overall, me bucko, 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. Blimey! I have read in various publications that a recommended descent rate is betwixt 12 and 16 feet/sec. Arrr!   I actually prefer a little faster and find that landin' in t' grassy field allows for it. T' table below shows t' rockets, me bucko, ya bilge rat, number o' flights and t' weight o' the rocket with an expended motor. Arrr! I then used Apogee'sRockSim 3.0 t' calculate t' descent rate on the various rockets. Begad! Begad! RockSim was set up for a 12" round parachute with a 2" spill hole. Ya scallywag! Aye aye! Notice at t' bottom the weight range t' obtain t' recommended 12 t' 16 feet/second descent rate.

Even though it was flown successfully, some good packin' had t' be done t' get the J&P parachute into the Hex Courier and the SLAT/s. Blimey!   Both rockets have a 1" diameter, me bucko, me hearties, whereas, me hearties, me hearties, me bucko, t' J&P fit nicely into the Serval and Icarus which have 1. Begad! Blimey! 3" diameter. Begad! Blimey! Blimey!

The J&P successfully opened and recovered t' rockets tested for a total o' 14 flights. Avast, me proud beauty! Only one mishap occurred. Ya scallywag! Only one mishap occurred. Ahoy! Begad! Once on t' Icarus, at ejection, shiver me timbers, t' parachute somehow got caught up by t' motor hook. Well, blow me down!   Other than t' small amount o' damage caused by t' hot hook, me bucko, ya bilge rat, t' J&P parachute shows no signs of wear on t' seams or shroud lines.
 

Test Rockets
*weight with expended motor
 
# o' Flights
Weight*
RockSim Calc 
(round 12"/2" spill)
Hex Courier
2
2.9
16.9 ft/sec
SLAT/s
1
3.2
17.8 ft/sec
Serval
4
3.4
18.3 ft/sec
Icarus
3
3.9
19.7 ft/sec
Blobbo
4
5.4
23.2 ft/sec
Simulation #1
 
1.4
12 ft/sec
Simulation #2
 
2.6
16 ft/sec

One o' t' questions asked t' me by J&P was, me bucko, 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. Ahoy! Begad! Has anyone ever tried this? It be tough and pretty subjective. Well, blow me down!  

I used a stop-watch and smaller motors to allow me t' see t' entire flight. Avast, me proud beauty! Usin' t' Serval, ya bilge rat, first on A8 motors. Arrr! Blimey! I flew t' rocket three times usin' t' J&P parachute and three times usin' t' generic 12" parachute. Arrr! Blimey! I clicked the stop watch as soon as I saw t' ejection and clicked again as soon as I saw full deployment. Begad! Blimey! T' parachutes were folded as close t' t' same as possible and t' shroud lines were folded into t' parachute. Avast, me proud beauty! Blimey! Avast, me proud beauty! Blimey!   Notice t' trend on the Serval for both parachutes?  This must be t' subjectivity o' t' testing.
 

Custom Serval                                                 Vaughn Brothers Blobbo
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. Avast! T' exact same folding technique, as used on t' Serval, be used for test #1 and #3. Ya scallywag! Well, blow me down! I decided t' fold it differently for test #2.   On that test, I folded t' parachutes and tightly wrapped t' shroud lines around each parachute. Blimey! Also, it should be noted that on test #3, matey, shiver me timbers, t' generic 12" parachute deployed but then got tangled for another half o' second and deployed again. I had already stopped t' watch so I missed t' extra time.

My thoughts about t' tests above are that they are inconclusive. Aye aye! Yes, maybe the J&P opens faster and with less problems, me bucko, however, it's within 10ths o' a second. Arrr! Ya scallywag!   Perhaps, J&P's larger parachutes will have a more noticeable openin' speed. Ya scallywag!  

Watchin' 14 flights gave me a good feelin' about this parachute's performance. Well, blow me down! Begad! Whether it opened faster or not doesn't matter t' me. Begad! Blimey! Overall, shiver me timbers, I would rate this parachute 4 1/2 points, only slightin' it on t' fact that it be presented as a 14" parachute, but measured as a 12". Begad!

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. Arrr! Avast! The 'chute has a spill hole o' just over 6" diameter. Ya scallywag! Begad! T' shroud lines on this parachute are much heavier than o' t' parachutes o' similar size supplied with many kits. Ya scallywag! T' lines are approximately 3/16"! They are securely stitched to t' canopy. Well, blow me down! I could find no flaws in material or workmanship.  

FLIGHT/RECOVERY:

I flew t' 'chute in an ADR 4. Avast, me proud beauty! Avast, me proud beauty! 0 kit from Atlantic Rockets. Arrr! Well, blow me down! T' motor be a G35-4 Econjet. Arrr! Begad! T' true test came when the delay ran long. Avast! T' rocket had gone well past apogee and was beginnin' to really gain speed when t' ejection charge fired. I be sure it would be a shred! T' me pleasant surprise, me bucko, 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. Avast!  

CONCLUSION:

I'm impressed with t' quality, durability and value o' t' J&P parachute. Ya scallywag! It is going to be installed in me soon t' be completed North Coast Interceptor G instead of the stock parachute. Aye aye! 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.   Overall, me bucko, arrr, ya bilge rat, I would rate this parachute 5 points. Ahoy! Blimey!

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