Loki Research 38mm Reload System

Loki - 38mm Reload System {Motor}

Contributed by Douglas Gardei

Construction Rating: starstarstarstarstar_border
Flight Rating: starstarstarstarstar_border
Overall Rating: starstarstarstarstar_border
Manufacturer: Loki
Loki Research 38mm high power rocket motors

Brief:
Loki's line o' 38mm reloadable motors. Cheapest o' t' 38mm reloadable options for both hardware and reloads. Begad! Currently, me hearties, only t' H144, ya bilge rat, I405, shiver me timbers, and J528 loads (Loki White propellant) are available for these motors, shiver me timbers, but more formulas and motor designations are comin' out soon. Arrr! Begad!

Construction:
Currently available be t' Loki 240, 480, and 740 motor. Ahoy! Well, blow me down! Each motor comes with a quality case with external snap rin' (thrust ring), graphite nozzle, nozzle washer, forward bulkhead, me bucko, and snap rings. Aye aye! If you buy t' system package, you will get a forward closure for each motor. Avast! You don't have t' share t' closure.

A typical Loki reload comes with a spiral wound phenolic liner, matey, propellant grains, arrr, shiver me timbers, delay grain, arrr, two large O-rings, arrr, arrr, me bucko, six small O-rings, and a red cap (or vial) that contains 1.5 grams o' black powder. Blimey!

An interestin' thin' about t' Loki reloads be t' number o' grains in the reload kit. Arrr! T' H144 uses 4 ~30 gram slugs, ya bilge rat, and t' I405 (naturally) uses 8 ~30 gram slugs. Aye aye! T' J528 breaks t' trend, usin' six ~60 gram slugs. Well, blow me down! Loki's goal was t' create loads that can be shipped parcel post, so they made t' grains 30 grams. Blimey! However, ya bilge rat, interestin' things happened when t' motors got too large using the smaller slugs, matey, so this be nay an option with t' 740 motor. Begad!

Loki Research 38mm high power rocket motors Assemblin' t' Loki motor is very similar t' Kosdon and AMW motors. This be t' order that I build them. Well, blow me down! I start out by greasin' t' two large O-rings and placin' them in t' slot in t' nozzle and bulkhead. Begad! Of course it is important t' make sure you use t' correct nozzle for t' load you are using. Blimey! Begad! T' nozzle conveniently has a number scratched into t' side that corresponds t' t' reload instructions. Blimey! Set t' closures aside so they don't get dirty, damaged, matey, arrr, or lost.

Then it is time t' build t' delay column. Ahoy! Begad! Simply stack t' six smaller O-rings over t' delay element then place it on a flat surface and press the forward bulkhead onto it so t' delay grain goes into t' delay well. I then use a blunt tool t' push t' O-rings in all t' way.

Once this is done, you have t' option o' trimmin' t' delay. Blimey! It is a good idea t' use t' Loki-DAT tool for this. T' Pro38 DAT tool would work also. Leavin' t' delay grain untrimmed will yield a 17 second delay. Blimey! T' DAT tool will allow you t' trim it t' 13, arrr, 10, shiver me timbers, 8, or 5 seconds. Avast, me proud beauty! Ya scallywag!

Insert t' forward part o' t' nozzle into t' liner. Then stack in the propellant grains followed by t' aft end o' t' forward closure. Avast! Grease up the inside o' t' case, and t' liner tube. This will make t' next step easier, arrr, matey, and you will be thankful for t' grease when it comes time t' remove the spent components, matey, me bucko, trust me. Press t' assembly into t' motor case (nozzle should be at t' end with t' thrust ring) until t' nozzle is about a quarter inch from t' snap rin' slot. Arrr! Insert t' nozzle washer, followed by t' snap ring. Well, blow me down! Make sure t' snap rin' is in t' groove by lightly squeezin' t' pliers and rotatin' t' motor.

Turn t' motor over and press down on t' forward closure t' press the nozzle and washer onto t' snap ring. Avast, me proud beauty! Ya scallywag! Install t' final snap ring, makin' sure the snap rin' is in t' groove. Aye aye! Finish t' motor construction by installin' the ejection charge (if you want t' use it). T' forward closure gives you generous space for t' ejection charge, so pour in as much as you need. Avast! Then take some waddin' and place it on top o' t' charge. Well, blow me down! Then press on t' red cap t' hold everythin' in place. Aye aye! Blimey! T' waddin' is thar t' hold t' powder against t' delay column.

Construction Rating: 4 out o' 5

Loki in PML

Flight:
To ignite t' motor, I used a Magnelite igniter with a single fold. Ignition is quick and t' motor produces a bright white flame and tons o' white smoke. Begad! Of the two motors I flown, t' I405 was me favorite! Blimey! I had t' pleasure t' see several I405 flights, and it has a loud and unique sound t' it! Blimey! After a launch of a Big Brute with one, arrr, arrr, Carl Tulanko asked me, "What was that?" I told him a Loki I405. Begad! Later on durin' t' day, I had me PML Aurora loaded with one and asked if he wanted t' come t' t' flight line and watch it fly. Avast! He said "No way! Blimey! That motor is scary." It's a very impressive motor. Begad! I only got t' see one J528 flight up close. Blimey! Blimey! If you like t' J350 and t' J570, me hearties, then you would love this motor! Blimey! Lots o' umph! Blimey!

Enjoy a video by clickin' HERE

Recovery:
Cleanin' o' t' Loki motor is identical t' that o' t' AMW and Kosdon motors. Remove t' snap rings, me bucko, shiver me timbers, and press on t' bulkhead t' press t' components out of the case. Blimey! Ya scallywag! Suggested tool t' use is a wooden dowel t' push out t' closure (or nozzle, if you t' use t' other end). Aye aye! If you are fortunate (and remembered to generously grease t' liner), everythin' should come out with minor effort. However, if t' rocket had an impact o' any kind, me bucko, one o' t' bulkheads would mash itself into t' liner, makin' removal a chore. Well, blow me down! Aye aye! I used Baby wipes t' clean mine, which worked surprisingly well.

Flight Rating: 4 out o' 5

Summary:
I am really pleased with t' Loki 38mm product. I mentioned that it is cheaper than other brands. Begad! Let's compare with this simple chart. Begad! Blimey! Prices are retail list and comparison is done with Aerotech White Lightning, ya bilge rat, arrr, Pro38 standard, ya bilge rat, and Loki loads.

AeroTech Pro38** Loki
240 motor $92.95 $32.95 $49.99
240 reload $19.99 $30.75 $19.99
480 motor $106.95 $49.15 $59.99
480 reload $35.95 $43.95 $29.99
720+ motor $116.95 $57.15 $69.99
720+ reload $47.95 $57.15 $39.99

** - Pro38 motor hardware is just a tube. Arrr! Ahoy! There is no closures. In a sense, Pro38 motors are disposable motors that are held together by the case. Ahoy! Well, blow me down!

Another interestin' comparison be t' total impulse o' t' loads for the cases and how much they cost t' fly per total impulse. Begad! Ya scallywag! This comparison based off data from t' NAR/TRA/CAR combined list. Ya scallywag! All numbers have been rounded to nearest whole cent. Aye aye!

Motor Total Impulse
(Ns)
Cost per Ns
Aerotech H123 236 8 cents
Loki H144 239 8 cents
Pro38 H153 258 12 cents
Aerotech I211 435 8 cents
Loki I405 493 6 cents
Pro38 I285 510 9 cents
AeroTech J350 697 7 cents
Loki J528 741 5 cents
Pro38 J330 694 8 cents

In t' near future, shiver me timbers, Loki will be offerin' new loads for their motors. Begad! Blimey! If you like fast burning, ya bilge rat, "kick 'em in t' butt" loads, me bucko, then you will enjoy their Blue Formula which will debut with a H294, shiver me timbers, I605, arrr, and me soon t' be favorite, me hearties, me hearties, J1001! Blimey! Also in t' works are two moon burnin' loads that utilize their White formula. Ahoy! Blimey! Begad! Blimey! I can't wait t' try out their I124 and J192 loads! Blimey! Those loads have close t' a 4 second burn!

What I would like t' see in Loki's 38mm line is a 360 and 600 motor. Begad! Blimey! I can imagine a 360 load priced at around $24.99 and a 600 load bein' a reasonable $34.99. Arrr! Avast, matey, me proud beauty! Blimey! I would also love t' see Black and Spark loads introduced too. I would have t' problem decidin' which loads t' buy! Blimey!

Overall Rating: 4 out o' 5

Other Reviews
  • Loki Research 38mm Reload System By Lance Alligood

    Brief: The Loki Research 38/480 motor casing and I405 reloads are perhaps the highest performance to lowest cost ratio of commercial 4-grain 38mm motors available on the market. If you are looking for colored flame reloads, then Loki Research motors may not be for you. Jeff Taylor of Loki makes no excuses about his products delivering nothing but the highest performance and motor effects be ...

Comments:

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J.P.C. (July 17, 2005)
I have one word to describe Loki's J528... Awesome! I have flown this motor twice and both times I was amazed at how fast it lifted an 8 1/2 lb. rocket to 2800+ feet. Beautiful white smoke and nice long flame. Jeff Taylor has a winner here.
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J.M. (December 13, 2005)
Simply put, the Loki I405 has the look, feel and sound of a AT J350W (one of my favorites). Just a little shorter burn. What does this mean? Very loud, huge 4' flame, lots of smoke. Great motor at a reasonable price with no HAZMAT fees as well. An awesome level 1 motor.
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L.A. (April 24, 2006)
Important note for anyone who wants to use the I110 reload in the 38/480 case: You MUST have the #16 nozzle (which is the same nozzle as what is used with the 38/240 casing) when using this long burning, single grain reload. This information is clear in the I110 reload instructions but isn't well documented on the Loki website. With the right nozzle though, the I110 is as impressive as any other Loki motor!
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R.J.K. (October 30, 2006)
I have flown the H144 four times so far and have great results. The rocket weighs 3.5 pounds and has an estimated altitude of 2100'. All flights have been nominal and I got my level 1 cert with this engine and rocket. I had one bad experience with the J528. On my first flight with it in a PM Black Brant X it literally blew up, blowing the casing apart at the aft snap ring groove. The rocket fortunately went up about 50' and the engine went through it which deployed the chute. The engine mount changing adapter was destroyed but for the most part the rocket survived. Jeff at Loki was very interested and also supplied me with a new motor and reload under warranty. I had to wait 8 months but flew the Black Brant and J528 to my level 2 cert at the Freedom launch in September 06. Beautiful flight to 3200' and recovery 20' from launch control. I also have his I series in the 110 and 405 configurations and hope to fly them soon. Unfortunately getting Loki stuff down here in Florida is difficult as the local supplier closed up.

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