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, me hearties, shiver me timbers, 14".  Nothing fancy, but, then again nothin' fancy expected. Arrr! After initial inspection, shiver me timbers, tests were conducted t' determine t' performance o' this parachute. Well, blow me down!

CONSTRUCTION:

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

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

[Closeup}[Closeup}

Another point about construction can be seen in t' two pictures above and one below. Blimey! Begad! Notice the J&P parachute on the left. Notice t' stitchin' around t' edge o' t' parachute and t' panels. Begad! I'm not a seamstress, shiver me timbers, me bucko, however, shiver me timbers, t' stitch is much finer and appears more durable than t' generic parachute on t' right, ya bilge rat, which has a zig-zag stitch. Ya scallywag! The picture below shows t' underside o' the J&P parachute and how the stitchin' looks. Aye aye! Begad!

[Closeup]Overall, me hearties, 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. Ahoy! Aye aye! I have read in various publications that a recommended descent rate is betwixt 12 and 16 feet/sec. Well, shiver me timbers, blow me down!   I actually prefer a little faster and find that landin' in t' grassy field allows for it. T' table below shows t' rockets, me hearties, matey, number o' flights and t' weight o' the rocket with an expended motor. Avast! Avast, me proud beauty! I then used Apogee'sRockSim 3.0 t' calculate t' descent rate on the various rockets. RockSim be set up for a 12" round parachute with a 2" spill hole. Well, shiver me timbers, blow me down! 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. Avast, me proud beauty!   Both rockets have a 1" diameter, me bucko, whereas, ya bilge rat, t' J&P fit nicely into the Serval and Icarus which have 1. Ya scallywag! 3" diameter.

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

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, shiver me timbers, "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 be tough and pretty subjective. Avast!  

I used a stop-watch and smaller motors to allow me t' see t' entire flight. Blimey! Avast! Usin' t' Serval, first on A8 motors. Ya scallywag! I flew t' rocket three times usin' t' J&P parachute and three times usin' t' generic 12" parachute. I clicked the stop watch as soon as I saw t' ejection and clicked again as soon as I saw full deployment. Arrr! Blimey! T' parachutes were folded as close t' t' same as possible and t' shroud lines were folded into t' parachute.   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. T' exact same folding technique, as used on t' Serval, was used for test #1 and #3. I decided t' fold it differently for test #2. Arrr! Ahoy!   On that test, matey, me hearties, I folded t' parachutes and tightly wrapped t' shroud lines around each parachute. Aye aye! Also, me bucko, it should be noted that on test #3, t' generic 12" parachute deployed but then got tangled for another half o' second and deployed again. Ya scallywag! I had already stopped t' watch so I missed t' extra time.

My thoughts about t' tests above are that they are inconclusive. Avast, me proud beauty! Yes, matey, maybe the J&P opens faster and with less problems, however, matey, it's within 10ths o' a second. Avast, me proud beauty!   Perhaps, J&P's larger parachutes will have a more noticeable openin' speed. Begad! Avast, me hearties, me proud beauty!  

Watchin' 14 flights gave me a good feelin' about this parachute's performance. Ya scallywag! Ya scallywag! Whether it opened faster or not doesn't matter t' me. Avast! Begad! Overall, ya bilge rat, I would rate this parachute 4 1/2 points, only slightin' it on t' fact that it was presented as a 14" parachute, matey, ya bilge rat, 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. Ahoy! The 'chute has a spill hole o' just over 6" diameter. Arrr! T' shroud lines on this parachute are much heavier than o' t' parachutes o' similar size supplied with many kits. Ya scallywag! Blimey! 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. Begad! 0 kit from Atlantic Rockets. T' motor was a G35-4 Econjet. Arrr! Avast! T' true test came when the delay ran long. Arrr! T' rocket had gone well past apogee and was beginnin' to really gain speed when t' ejection charge fired. I was sure it would be a shred! T' me pleasant surprise, shiver me timbers, 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". Begad! 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. Arrr! It is going to be installed in me soon t' be completed North Coast Interceptor G instead of the stock parachute. Begad! This would make a great upgrade t' t' typical kit supplied parachute. Ahoy! Avast, arrr, me proud beauty! If you are lookin' for a quality parachute at a reasonable price I highly recommend you look at a J&P product. Well, blow me down!   Overall, I would rate this parachute 5 points. Begad!

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