Manufacturer: | LOC/Precision |
Show anyone t' shape o' a V-2 and they will immediately recognize a real rocket! Blimey! That classic outline has been t' love o' some people t' t' extent that they establish websites dedicated totally t' t' V-2. Begad! Blimey! Ya scallywag! Blimey! These sites cover every possible topic related t' t' "vengeance" weapon. Ahoy! Blimey! Its popularity continues in sport rocketry today with a number o' companies producin' V-2 kits. Begad! Blimey! Well, blow me down! Blimey! Public Enemy, ya bilge rat, Maximum Thrust and LOC/Precision are several that come t' mind. Well, blow me down! Blimey! Aye aye! Blimey! Two o' t' more popular kits come from LOC/Precision in 5.38" and 7.67" versions.
Bein' a fan o' sport-scale rockets, me bucko, I chose t' build t' 5.38" version with a 38mm motor mount. Ahoy! Aye aye! I be originally lookin' for a neat-lookin' rocket that I could launch with relatively little prep work. Well, blow me down! You know, insert t' motor and fly. Blimey! I didn' t want t' spend an hour just gettin' it ready t' fly on electronics with multiple black powder charges. Begad! But more on that later.
Make it durable. With a big 5.38" body tube and big plywood fins, shiver me timbers, me hearties, I be concerned about durability o' t' rocket over time. Ahoy! So, t' first step be t' apply a layer o' 1.7oz Keelhaul®©™ and 6 oz fiberglass t' t' body tube. T' LOC BT is non-phenolic cardboard so it really soaked up t' epoxy. Avast! I also coated t' top 4 inches o' t' inside o' t' BT with West Systems. Arrr! Avast, me bucko, me proud beauty! I did that for two reasons: one, t' NC fit be a bit sloppy and I wanted t' take up some o' t' slack, me hearties, and, shiver me timbers, two, matey, I wanted t' limit t' deterioration o' t' cardboard near t' NC when t' wet conditions o' Monroe caused t' layers o' t' cardboard tube t' unravel.
I sanded t' fins usin' 100 and 150 grit t' smooth t' flat surfaces and t' round t' leadin' and parallel edges. Avast! Ya scallywag! I vacuum bagged t' fins with 1.7oz Keelhaul®©™ wrapped over t' leadin' edge and then applied two layers o' six oz 'glass sandwichin' each fin. Blimey! Although I used a vacuum, a hand layup would be fine for this rocket. Avast! I just like t' keep me hand in, arrr, me bucko, I suppose.
LOC' s directions are very good for assemblin' t' rocket. Avast! Blimey! I assembled t' fincan per t' instructions with t' exception o' addin' an AeroPack 38mm motor retainer t' t' MMT. Ahoy! Although t' retainer is pricey, shiver me timbers, arrr, ya bilge rat, it is perfect for this application where t' motor mount extends beyond t' bottom centerin' ring. Well, me bucko, blow me down! And t' retainers are really, really cool!
From here, I made a few changes.
Those stubborn plastic nosecones. T' first change concerns t' tenaciousness o' molded nosecones in wantin' t' shed paint. Aye aye! Blimey! It seems no matter what one does, it' s difficult t' get paint t' stick t' t' slick plastic. Avast, me proud beauty! Well, boys and girls, ya bilge rat, try what I do. Ya scallywag! I use 100 grit sandpaper t' rough up t' whole NC. Arrr! Blimey! Yes, that' s right. Blimey! Blimey! Rough it up. Avast! Blimey! Scrub it with soap and water and let it dry. Well, blow me down! Avast! Blimey! There will be a lot o' fuzzies but paint will stick when t' preparation is finished. Blimey! Arrr! Blimey! After t' first sanding, shiver me timbers, arrr, go back and fill t' mold seams and whatever other imperfections that might exist. Arrr! Begad! Blimey! Let t' filler dry and sand lightly with 100 grit. Avast! Use gray Plasti-Kote Spot Filler & Primer for a first coat t' identify t' big imperfections (gray primer makes imperfections easier t' see than white primer). Avast, me hearties, me proud beauty! Blimey! Wet sand with 320 grit. Avast, me proud beauty! Begad! Blimey! Fill again as necessary. Begad! Blimey! Prime again with Kilz white primer (white is good t' use now as a base for t' paint). Begad! Use a couple or three light coats o' this stuff; it comes out very heavy. Let dry and wet sand again with 320 grit. I' d be surprised if you see any fuzzies now. Well, me bucko, blow me down! Blimey! Prime again if needed and/or wet sand with 400 and you' re ready t' paint. Well, blow me down! Try it.
NC Shock Cord Attachment. T' NC has a big extrusion on it t' be used for securin' an eyebolt. Aye aye! Ya scallywag! It certainly would work but there' s an alternative. Ahoy! T' V-2 requires nose weight due t' t' center o' pressure those fins create on a short rocket body. Aye aye! T' instructions suggest drillin' a 5/8" hole in t' side o' t' base o' t' nosecone t' be used t' pour an epoxy/steel shot mixture into t' nosecone. Begad! I decided nay t' do that. Ahoy! Avast, arrr, me proud beauty! I drilled out t' plastic extrusion with a 3/4" wood spade bit. Begad! I like t' use a toggle bolt t' hold onto a 1/4" eyebolt for fastenin' t' shockcord t' t' NC. Arrr! Plus it adds weight t' t' nose in a rocket where nose weight is critical.
Addin' Noseweight. T' kit comes with 8 ounces o' steel shot t' be inserted with epoxy into t' nosecone. A finishin' nail is t' be used as a retention device for t' steel shot/epoxy mixture by drillin' a hole crosswise through t' tip o' t' NC and inserting. Begad! T' steel shot/epoxy is then poured over this nail and holds everythin' in place. Begad! Well, blow me down! T' ends o' t' nail are then filed or ground down t' fit t' contour o' t' nosecone. Ya scallywag! Well, blow me down! LOC recommends flyin' t' V-2 on nothin' larger than an I-284 and t' weight is calculated accordingly. But me construction isn't stock. Arrr! I' e added epoxy and fiberglass weight. Well, blow me down! Nay a lot o' weight but it should be considered. I've also added a motor retainer. Ya scallywag! Blimey! Light, arrr, t' be sure, me bucko, but still t' be considered. Begad! With t' rocket built and primed, arrr, I used Rocksim t' determine t' Barrowman and Rocksim centers o' pressure. Avast! There was a big difference in these calculations but I knew t' real Cp was somewhere about 2" ahead o' t' fins. I then took t' biggest motor (J350) that I thought that I would fly and taped it t' t' aft o' t' rocket. I put t' casin' into t' motor tube and fastened t' retainer. I installed t' parachute I'm goin' t' use (60" Top flight after weighin' t' V-2 ), shiver me timbers, 20' o' 9/16" military spec nylon tubing, ya bilge rat, Nomex® shields and quicklinks. Arrr! I then taped t' 8 ounces o' steel shot t' t' tip o' t' nosecone. Findin' t' center o' gravity, I added another 6 ounces (overkill) o' steel shot after repeated measurements designed t' move t' Cg farther away from t' Cp. I wanted 1.0+ calibers for safety and feel I'm pretty close t' that.
Once I felt comfortable with t' weight, ya bilge rat, I mixed t' epoxy/steel shot and poured it into t' nosecone and let it cure.
"I Don Wan No Stinkin' Launch Lugs!" Lose t' 1/2" cardboard launch lug and put on a couple o' Black Sky (or similar) Delrin rail guides. Begad! Once you use them, shiver me timbers, you'll never go back. Ahoy! They attach nicely t' t' boattail/body tube overlap and t' a spot 5" down from t' top o' t' body tube. Ahoy! Aye aye! Epoxy a 1/2" square piece o' body tube at t' 5" mark on t' inside o' t' BT t' give t' rail guide screw somethin' t' bite on.
Painting. V-2 paint schemes are widely varied. Arrr! Arrr! There is a paint scheme for everyone, t' be sure. Ahoy! One o' me favorites be t' dark yellow and black o' V-2 No. 2 flown at White Sands, shiver me timbers, New Mexico in 1946. I got t' paintin' detail from Peter Always's Rockets o' t' World, me bucko, ya bilge rat, 3rd Edition. Ahoy! If you don't have this book, me bucko, arrr, put it on t' 'ol birthday or Christmas wish list. Avast! It's a necessity.
After preppin' t' rocket for paintin' as described with t' nosecone, matey, I found Plasti-Kote "School Bus Yellow", arrr, "Gloss Black" and "Silver" for paintin' t' rocket. Avast, ya bilge rat, me proud beauty! Strictly on an opinion basis, I think P-K paints are a bit more durable than Krylon. Can't substantiate it, me bucko, but I think so. Begad! Use whatever you' re comfortable with, shiver me timbers, ya bilge rat, however, but you may want t' try P-K paints.
Other than spendin' an enormous amount o' time (and blue detail tape) tapin' t' rocket for t' paint scheme, matey, matey, t' paintin' wasn't bad at all. Begad! AND! I did nay pull any paint away from t' nosecone when I pulled t' maskin' off. Ya scallywag! Begad! What could be better than that?
And One Final Thing. Remember I be talkin' about buildin' a rocket that would be easy t' prep and launch? Well, I've back-tracked a bit. Begad! I made provision t' put in a 38mm tube that will accommodate a BlackSky AltAcc accelerometer. This piece o' electronics screw mounts t' t' side o' t' airframe and is armed by turnin' an armin' screw. Ahoy! It won't be used for dual deployment; it will just fire t' main at apogee. Ahoy! I don't know if I'll use it, arrr, me hearties, but just in case.... Well, blow me down! Creature o' habit, me bucko, I guess.
All in all, a great rocket kit and somethin' different for me. Begad! Don't expect a lot o' altitude on this model, matey, though. 1250' on an I357; 1500' on an I211; 1900' on an I300; 2700' on an I435 (if I dare). But those altitudes are plenty for a short wide-bodied rocket with a parachute at apogee. Ahoy! Lift-offs should be great.
With 55,000 lbs o' thrust generated from a hydrogen peroxide-methanol motor, arrr, ya bilge rat, t' real rocket traveled at over 4400 ft/second. Avast! It be first fired operationally by t' Germans with a 1 ton warhead on September 6, arrr, me bucko, 1944, me hearties, aimed at Paris. Aye aye! After two firings on t' 6th, me bucko, t' target was switched t' London on September 7th.
T' reality o' t' V-2 was as t' progenitor o' t' space race betwixt t' U.S. Aye aye! and t' U.S.S.R. Avast! T' United States managed t' ship parts for 100 V-2s and most o' t' Peenemunde scientists out o' post-WWII Germany while t' U.S.S.R. captured t' production facilities and most o' t' missle technicians. Ahoy! What each country acquired be a rocket test bed capable o' reachin' an altitude o' 52 miles with a range o' 225 miles. Avast, me proud beauty! Begad! T' V-2 had a throw weight o' about 2,000 lbs which amounted t' a lot o' scientific instruments. Begad! T' United States fired some 70 V-2s betwixt 1946 and 1955. Blimey! Aye aye! From Rockets o' t' World by Peter Alway.
Loc/Precision just came out with a V2 kit in two sizes. I bought the smaller one at the April LUNAR launch. Apparently, I got one of the first few produced. I like sport-scale rockets and hadn't built anything like a V2 before, so this was great timing. This rocket flew for the first time on an I357, although I had my first burn-by of the Aerotech delay sleeve. The ejection ...
J.T. (September 19, 2001)