Manufacturer: | Scratch |
BACKGROUND:
I have never made it a secret that I love t' looks o' Nordic Rocketry's Meanie. Ahoy! It is usually t' first rocket I fly at every launch and I love it on D's t' F's. Begad! Bein' t' case, I decided that I would love a 2x version.
Comin' up with a 2x version wasn't exactly possible since t' original was 2.6" diameter airframe and t' nearest t' 2x tubin' I could find was 5.5". Avast! Well, matey, blow me down! So be it, matey, I have a 2.11x version.
I decided on usin' Phexible Phenolic tubin' which was purchased from Red Arrow Hobbies. Arrr! Aye aye! Blimey! I also decided t' use 1/4" plywood for t' fins and t' LOC 5.5" Long Nose Cone (longer than t' Minni-Mags).
In addition, it was goin' t' be a 38mm motor mount and have an ejection baffle.
THE BAFFLE:
I heard about t' troubles that people expressed with baffles gettin' clogged up and even on t' LOC Baffle kit, I purchased, shiver me timbers, it said t' clean it out with a pin every so many flights. Avast! Blimey! This bein' t' case, matey, I decided t' create a removable baffle unit.
T' removable baffle unit was constructed usin' plastic plumbin' components. Avast! Arrr! T' diameter o' t' 38mm tube was much too small t' securely fit inside t' plastic plumbin' collar so I wrapped it with tape until it fit in loosely. Ya scallywag! Then usin' liberal amounts o' epoxy I glued t' motor tube in place. Arrr! Well, ya bilge rat, blow me down! I then epoxied t' plastic ferrule t' t' LOC baffle so that it slid inside o' t' 38mm tube and so that it was above t' collar-nut. Avast, me proud beauty! T' pictures tell t' story better.
THE NOSE CONE:
In order t' get t' Center o' Gravity where it needed t' be on t' "stubby" rocket, shiver me timbers, I needed t' get weight into t' nose cone. Avast! I didn't want it permanent though. Arrr! So I came up with a way t' do it.
I first cut a 1" hole in t' bottom o' t' nose cone. Begad! Blimey! Then I used enough 24mm tubin' so that when pushed into t' hole it would reach all t' way t' t' top (tip) o' t' nose cone. Avast! Ahoy! Blimey! I then used a large and small washer t' secure it. I then used bb's until I had enough weight t' brin' t' CG t' where I needed it. T' bb's were epoxied in and then t' rest o' t' 24mm tube was filled with foam. Ahoy! Arrr! Blimey! (Do this in small layers so it will dry) Usin' this method, me hearties, I could use different 24mm tubes (weighted differently) as I changed motors . Arrr! Avast! Blimey! . Avast, me proud beauty! Ya scallywag! Blimey! . Avast, me proud beauty! or at least that was t' plan.
DID IT FLY?
Yes. Weighin' in at 6 1/2 pounds, shiver me timbers, ya bilge rat, utilizin' two 43" JP parachutes with a 20 foot tubular nylon shock cord, and loaded with an H128 (usin' a 29mm motor adaptor), me hearties, this bird looked great on t' pad. Avast! Avast, me proud beauty! A windy, arrr, windy day at Battle Park 1999, me bucko, however, she was goin' t' fly.
T' countdown . Begad! . Begad! Blimey! . Begad! ignition . . Blimey! . Ahoy! Begad! lift off. Avast, me proud beauty! It was beautiful! It reached about 500 feet and then started downward. Avast! NO EJECTION!
WILL IT FLY AGAIN?
Yes. I will rebuild it. Avast! Begad! Blimey! I still have t' other half o' t' 5.5" tubin' but I need a new nose cone.
Below are t' makings for t' new motor mount. Well, blow me down! When finished it will be 1-29mm and 3-24mm. Ahoy! Notice how t' 24mm are angled. These are aligned t' have thrust in line with Center o' Gravity. (I read about this cantin' in some publication)
In addition, I decided t' do it right, so I paid Public Missiles t' cut me new fins from G10.
LESSONS LEARNED APPLIED:
I will nay be usin' a baffle unit this time. Blimey! Aye aye! Nay that it wouldn't work, shiver me timbers, me bucko, however, arrr, me hearties, I have moved toward altimeter based ejection on this one.
In addition, arrr, shiver me timbers, arrr, with t' 29mm motor, matey, I have only made t' length o' t' motor mounts long enough t' handle me 29-180 casing. Avast! Ya scallywag! Blimey! This has given me more room t' pack t' shock cord, matey, altimeter and parachutes in t' body. It was previously a very, ya bilge rat, me hearties, very tight fit.
I will utilize t' nose cone weight method again because I liked how that worked, matey, me hearties, however, I will be also need t' consider t' addition o' a shock-cord tube in t' nose cone. This will be used like a deployment bag for t' shock cord.
SUMMARY:
T' exterior design o' t' rocket is obviously nay me own, me bucko, however, shiver me timbers, me hearties, t' "guts" are. Well, blow me down! I learned a lot durin' t' first-round and should have t' second one ready t' fly at t' NSL in NY at t' end o' May. Ahoy! It is gettin' primed right now!
NARAM-43 Update 8/01:
After sittin' nearly 2 years in t' "ready" state. Ahoy! I be able t' brin' her t' NARAM-43 for t' maiden voyage.
Weighin' in at just over 6 pounds, I loaded me 29-180 case with an H238 and also three (3) 24mm E18's. Ahoy! Well, blow me down! Blimey! It was set up for motor ejection off o' t' H238 usin' a "S"hort delay (6 seconds) and t' 24mm motors used 10 second delays and then capped. Ahoy! Aye aye! Blimey! Accordin' t' RockSim, this should boost this rocket t' just over 1000 feet and t' delay time be perfect!
T' "heads up" flight (first flight) was announced and t' countdown began. Begad! T' launch button be pushed and t' H238 "punched" t' rocket into t' air. Ahoy! Ya scallywag! Six seconds o' silence and a straight boost, me bucko, matey, boom, shiver me timbers, me bucko, ejection and descent only 50 or so feet from t' pad. Well, blow me down! Perfect lookin' flight and several people commented on it. Aye aye! One guy said (and I agree), "it doesn't have t' be high t' be a great flight, arrr, good job."
But...upon inspection, me hearties, arrr, only t' H238 lit.
T' next day, ya bilge rat, shiver me timbers, t' rocket be prepped exactly t' same way and actually turned in an identical performance on another H238 and 3 x E18 (same ones, didn't even remove them). Avast, me proud beauty! Again, me bucko, only t' central H238 lit.
I be pleased t' get both o' these flights and at how t' rocket performed. Arrr! It was very stable and t' big RocketMan 'chute did t' job. Aye aye! Looks live Rev 2 was a good design.
3 Oaks, Michigan Update 11/01:
I really wanted t' have a full perfect cluster launch, so I toted t' Meanie x2 t' Michigan. Begad! Begad! This time t' fly on those same three (3) E18's and this time a central H165 Redline Motor. Ahoy! Well, I had very different results this time!
Everythin' was prepped and t' launch button pressed. Well, blow me down! Begad! T' rocket slowly lifted from t' pad, cleared t' rail, lifted ever so slowly t' about 25 feet. Turned gracefully and dived into t' soft mud. By now you've guessed it. Ahoy! ONLY t' three (3) E18's lit!! I was actually surprised that they lifted t' rocket.
Well, I collected t' rocket, me hearties, went right back t' t' inspection table and filled out another flight card. Ya scallywag! Returned t' t' pad and launched t' rocket on t' central H165. Well, blow me down! Blimey! It gave a nice flight and perfect recovery.
I'll be tryin' again and tryin' t' perfectly match t' 4 ignitors t' get all motors t' fire, me bucko, but in t' meantime am very pleased about t' performance o' me Meanie x2, number 2.
LESSONS LEARNED:
I regret nay buildin' t' motor with a central 38mm. I didn't own any 38mm hardware and really didn't have t' intention when I built t' rocket over 2 years ago (almost 4 years for t' first version). Begad! Blimey! Now, I really stuck with H128's, H238's and H165's. This is goin' t' give me flights betwixt 1000 and 1200 feet usin' 24mm RMS E's and F's. Ya scallywag! Blimey! I can get t' about 2400 feet with some 24mm G55's, but that is about peak. Avast! Blimey! Arrr! Blimey! I'm okay with t' altitude limitation, but with t' 38mm hardware I could have tried many other motors.
I had the idea one day to make a switchable motor mount so that I could fly a rocket on various motor sizes and configurations. I searched the web and found I wasn't the first to have that idea (no surprise there). Then I connected with Mark over at True Modeler Rocket Kits . He is selling his ...
I have expressed and continue to express how much I enjoy flying my Nordic Rocketry Meanie kit. This kit has now logged 20 flights (as of 7/99) and is my traditional first flight at each launch. Well, liking this kit so much I first decided to build a 2x upscale. That venture was fun and very ...