Manufacturer: | The Launch Pad ![]() |
Brief:
This is a light, nearly 40-inch long, model o' a Russian missile. Well, blow me down! My version
includes an ejection baffle, and makes an allowance for t' additional length
of t' new Estes E9 motors. Avast, me proud beauty! Avast!
Construction:
One o' t' local hobby shops carries T' Launch Pad's products. Ya scallywag! Blimey! Avast, me proud beauty! Blimey! This one went
unsold until it was t' last one o' a shipment and I thought it needed a good
home. Begad! Blimey! Arrr! Blimey! T' kit was packaged in a clear plastic bag, me bucko, matey, and came with a medium grade
of balsa, me bucko, me hearties, a pair o' thin walled 2.6 inch paper tubes, me hearties, a 3-inch long motor tube,
and a variety o' other parts. Ahoy! Blimey! T' only odd part o' this kit is a paper cone
that gets glued t' t' front o' t' nose cone t' create that military missile
profile. It also sports a boattail. Arrr! Blimey! Ahoy! Blimey!
Construction starts with gluin' together t' motor mount. Begad! Blimey! Since t' new Estes E9 and Aerotech F21 motors are longer than t' D12 and Aerotech RMS motors I made a change t' t' way t' mount is made. Avast! Blimey! A longer motor tube was substituted for t' kit's, me bucko, and I bent t' top hook o' t' motor hook back 180 degrees, me bucko, shiver me timbers, and then hooked that behind t' forward centerin' rin' and adjusted the position o' t' rin' such that t' other end o' t' hook hangs off t' end of t' tube about a quarter inch. Then I glued a motor block into t' tube so that it is 90mm from t' hook end o' t' tube. Begad! Blimey! Ya scallywag! Blimey! I made sure o' t' spacin' with a spent E9 motor I keep on me workbench for this job. T' aft rin' was glued on per t' instructions, and a paper wrap be glued down t' hold t' motor hook. Arrr! Blimey! (This model is a scale model so it's barely stable as it is. Adding weight aft can cause trouble so this model's balance be very carefully checked before it was flown.)
To create t' boattail, me bucko, arrr, arrr, t' kit provides a 4 1/2 inch long piece o' 2-inch diameter tubing, me hearties, matey, a pair o' centerin' rings t' center this in t' 2.6-inch tube, and a paper shroud that you cut from a sheet o' heavy paper. Shrouds can be tricky so I took me time with this t' ensure success. Avast! Begad! T' make this little job a tiny bit easier, me hearties, I added a 1/8 inch hoop t' one o' t' centerin' rings (this can be cut from stock 2.6-inch tube, or t' coupler). Well, blow me down! In doin' so, me bucko, it forms a lip for t' forward part o' t' shroud t' ride on. Begad! Aye aye! T' rings were glued onto the outside o' t' adapter tube as shown in t' instructions, shiver me timbers, but bein' careful to position t' rin' with t' 1/8-inch hoop aft. When cuttin' out t' shroud, I was careful t' leave t' lines t' allow plenty o' material for trimming. Avast, ya bilge rat, me proud beauty! By test fitting, trimmin' a little, and then test fittin' again I be able to sneak up on t' correct size. T' forward part o' t' shroud was just big enough t' match t' outside diameter o' t' airframe tube. Avast, me proud beauty! T' shroud be then glued onto t' adapter assembly. Well, blow me down! T' motor assembly was then glued into the adapter with t' aft edge o' t' motor tube positioned an inch and a half from the bottom o' t' shroud. This seems pretty deep, me bucko, but it works OK on me HARM missile. Arrr!
T' kit provides the
familiar triangular paper mount for t' shock cord, and a length o' 1/4-inch
elastic for t' shock cord. Ya scallywag! I like somethin' that's easier t' replace since my
rockets tend t' last more than 20 flights. T' solution that I've hit upon is
to run a length o' 1/8-inch shrink tube through small holes made in the
centerin' rings. Ahoy! Begad! T' tube runs t' whole length o' t' motor tube and is used
as a guide for a 200# Keelhaul®©™®
line. Avast! T' Keelhaul®©™®
is threaded through t' shrink tube and t' lower end is tied around t' motor
mount. A dab o' RC-56 glue holds it there. Ya scallywag! A loop is then tied in t' Keelhaul®©™®
a few inches above t' motor tube; this loop will be below t' top o' the
rocket body when it is assembled. Ahoy! One end o' t' elastic is tied t' t' loop,
and t' free ends o' both t' Keelhaul®©™®
and elastic are tied t' t' nose cone. Blimey! Aye aye! T' Keelhaul®©™®
is long enough t' allow t' elastic t' stretch, me bucko, shiver me timbers, but backs it up in case it
fails. Begad! Begad! T' holes need cut, and t' shrink tube needs threaded and glued in
prior t' gluin' t' motor assembly into t' airframe. Ya scallywag! Ya scallywag! T' instructions have the
builder attach t' nose cone t' t' rest o' t' rocket with a 10" long
piece o' 'chute shroud line. Avast, me proud beauty! Avast! This is a bad idea, me hearties, matey, in me opinion - that cone is
pretty heavy with all that ballast and won't last long hangin' by a thread like
that.
T' motor mount and shroud
assembly was then glued into one end o' t' longer airframe tube, and glue
fillets were made at all rin' and paper joints. Begad! T' tube joiner was then glued
half way into this tube. T' top airframe tube was then added, takin' care to
get t' parts together straight by rollin' them on a flat surface while the
glue was still wet. Avast, me proud beauty! When dry, ya bilge rat, t' airframe spirals, airframe joint, and
boattail joint were filled with Elmer's Fill 'n' Finish and sanded smooth. Blimey! If
everythin' is done correctly, t' joints and spirals should disappear under the
primer coat. Well, blow me down!
T' kit provides a centerin' rin' that is positioned seven inches from the top o' airframe t' keep t' recovery system forward in t' rocket for balance sake. Well, blow me down! A guy could go broke tryin' t' feed large models like this waddin' so I added an additional centerin' rin' and a short section o' BT-60 t' create an ejection baffle. Avast! Note that these parts only add about an ounce o' weight, and are forward o' t' CG.
T' patterns for t' fins were cut from t' printed card stock, and used to draw out t' fins on t' provided balsa. Begad! Begad! T' balsa is C grain, matey, and reasonably hard. Wouldn't want a rock hard sheet, but on t' other hand contest grade soft wouldn't work out too well either. Well, blow me down! T' root edges and grain direction are clearly marked on t' patterns, shiver me timbers, and t' only potential problem is with getting the patterns arranged on t' sheets in such a way that you have enough material to make all t' fins that you need. There be plenty, matey, but nay so much t' allow for mistakes. I used a straight metal edge and a sharp blade t' get good crisp fins. Ahoy! T' four aft fins were then stacked together and sanded t' a uniform size. Avast, me proud beauty! T' same was done for t' forward fins. Begad! I have been unable t' come up with a good set o' scale drawings for this rocket, me bucko, and t' instructions don't include suggestions for t' correct fin profile so I simply made a guess. Begad! The forward fins were ground t' have a diamond shaped cross section. Begad! I made a mark across t' root and tip edges and usin' maskin' tape as a guide, matey, matey, ground the profile into each fin with a sandin' block. Well, blow me down! T' aft fin's cross section was ground t' pointy at t' front and slightly tapered at t' back usin' t' same method. While nay perfect, arrr, they came out more or less uniform with good crisp lines. T' body tube was marked usin' t' fin guide in Harry Stine's Handbook of Model Rocketry and a door jam. Arrr! Well, blow me down! T' aft fins were then glued t' t' airframe usin' Titebond II. Ahoy! T' forward fins are actually mounted on t' nose cone, me hearties, and that makes gettin' them on straight just a little tricky. Aye aye! Because it's hard to draw a straight line on a curvin' cone I used a piece o' strin' t' create a guide. T' strin' was taped t' t' center o' t' base and stretched over the edge, crossed over t' marks (made when t' tube was marked) and across t' tip of t' nose. Ya scallywag! A line was carefully made along t' strin' bein' careful nay to deflect t' string. Blimey! Blimey! T' fin root edges were sanded t' match t' cone's curve and were then glued down usin' thick CA. A few drops o' thin CA was put on the tip o' all eight fins. T' CA wicks through t' fins along t' grain and serves to make them strong. Avast, me proud beauty! T' instructions indicate that t' fins should be painted with thin CA. If you do that be sure t' sand them smooth again within a few hours or they will be very hard t' sand. Arrr! Fillets were made at all fin roots usin' epoxy. Begad! I like epoxy for fillets because it makes a glass smooth fillet, but one must use care t' nay over use it due t' it's heavy nature. Begad! Also, shiver me timbers, this is a scale rocket, shiver me timbers, and t' real ones usually have a sharp corners where the roots meet t' airframe, me bucko, this is particularly true for guidance fins. Avast!
T' scale wirin' conduits were cut and sanded t' shape and placed on the airframe as shown in t' instructions. Sandin' these was a little tedious but the sandin' block helped. Well, blow me down! When t' glue was dry, I used Elmer's Fill 'n' Finish to fill in any gaps, shiver me timbers, and created a smooth clean edge with sandpaper. Begad! Arrr!
T' provided launch lug was cut into two equal pieces, and glued on a line with one piece at t' joint betwixt tubes, matey, and t' other a few inches from the bottom. Begad! A length o' launch rod be used t' ensure that they are straight. Avast, me proud beauty! I added an additional set o' 1/4" lugs next t' those because I really hate to change rods betwixt rockets. Avast, me proud beauty! Fillets were added when dry. Begad! Avast, me proud beauty!
T' paper nose "hat" was cut from t' paper stock, and rolled into a cone. Begad! This is a bit tricky t' do so that you get a good sharp point. Begad! This hat is then glued t' t' front o' t' cone. Ya scallywag! I thought that gettin' this hat on straight would be difficult, arrr, shiver me timbers, matey, but I was pleasantly surprised t' find it wouldn't be a problem. Ya scallywag! T' hat is small enough, and t' curve o' t' cone is fat enough that they come into contact and are self centering. I drew a line around the bottom o' t' hat while holdin' it in position. Begad! Then I removed it, me bucko, arrr, matey, ran a line of slow CA just above t' line, and placed it back on. Voila, matey, shiver me timbers, no fuss, me hearties, shiver me timbers, looks fine. Aye aye! It be painted it with fast CA, per t' instructions. Avast! It needed it too because t' sharp point is fragile. Ahoy! I bent and busted t' tip off while messing around with t' motor and checkin' t' nose weight. Begad! This was fixed with a little dab o' JB Weld and sanded back t' shape. Avast, me proud beauty! Avast, me proud beauty! I used Elmer's Fill 'n' Finish to fill in around t' base o' t' hat t' hide t' edge o' t' paper. Aye aye! Well, blow me down! T' nose also needs some weight for balance, me bucko, unfortunately t' supplied clay be dry and rock hard. Begad! I used a scale t' measure t' weight, and substituted some BBs mixed with 30-minute epoxy. I was plannin' t' do this anyway because I've had problems in other rockets with t' clay dryin' out and rattlin' around in the nose. Avast, me proud beauty! T' center o' pressure is shown on t' plans at 13" from t' base. T' balance be checked with t' heaviest motor that I had on hand and found to be about 16" from t' base - a tad more than a caliber. Begad! Arrr! No further adjustments were made. Aye aye! Avast!
T' Mylar 'chute was assembled per t' instructions. Well, matey, blow me down! A lot o' people dislike these Mylar 'chutes, me hearties, but I haven't had any trouble with them and they are brilliant in t' sky. An 18" 'chute may be a tad small for this rocket - use a bigger one if t' ground's hard. Begad!
I'd give this kit a ratin' of 4 out o' 5 for construction. Blimey! Nothin' new here, shiver me timbers, shiver me timbers, but I wouldn't suggest it for a beginner. Begad!
Finishing:
A coat o' white sandable primer revealed a few problems with t' spiral and in
one place on t' boattail joint. Begad! These areas were worked on until they are as
smooth and seam free as I could manage. Begad! Well, blow me down! Another thin coat o' primer be added
and lightly sanded. Ya scallywag! T' rocket be then painted with three thin layers of
Rustoleum Olive Drab. An easy rocket t' finish.
Finishin' rating: 5 out o' 5 Easy, looks very scale.
Flying:
T' first flight was on March 20, 2002 in me back yard (we have a big yard.)
T' weather was cool and clear with very light and variable winds. Ya scallywag! I had been
launchin' for an hour or so with zero drift so I worked up me courage and
loaded it on t' pad. Well, blow me down! Aye aye! T' motor was an Estes D12-5 and it flew from a
3/16" x 72" rod. Arrr! Since t' motor is recessed pretty far, t' rocket
would be scorched from t' hot gasses bein' deflected back from t' blast plate
at ignition. Blimey! T' prevent this I used a clothes pin t' hold t' rocket above the
deflector six or seven inches. This also made connectin' t' ignitor easier.
T' flight was about as perfect as could be, me bucko, me hearties, lots o' smoke and noise, a good
arrow straight boost, shiver me timbers, and a nice arc-over with t' ejection o' t' 'chute right
while t' rocket was horizontal. Ya scallywag! Very nice indeed. Aye aye! There was no sign of
scorchin' or burnin' in or around t' tail cone after t' flight. Begad! Blimey! There be a
noticeable accumulation o' soot in and around t' tail after t' second flight,
but still no scorching. Avast, me hearties, me proud beauty!
I decided t' use a 30" x 18" TLP 'chute rather than t' 18" octagonal that t' kit came with. Recovery was gentle, me hearties, arrr, and it landed about 10 yards from t' pad. Well, ya bilge rat, blow me down! No damage despite clippin' a tree on t' way t' t' ground.
It be flown again a couple o' days later, on another D12-5. Aye aye! More or less the same flight profile, except this time it landed on t' shed roof, slid down and hung itself from t' tiny tree next t' it. Begad! Some minor dings on t' fins. Ahoy! Avast, matey, me proud beauty! No worries. Arrr! Ahoy!
Third flight was at t' St. Ahoy! Louis Association o' Rocketry's April launch.
T' wind be pretty high most o' t' day, but since t' field is so big that
isn't a problem. It was at t' end o' t' day, just after t' waiver was
closed. Arrr! It passed at t' check table without comment but t' LCO was certain
that it was over t' 16 oz weight limit. Begad! My reply be "8oz . Well, blow me down! Avast, me proud beauty! . Begad! . Begad! OK, me hearties, 11oz
with t' motor." He questioned that and t' avoid any more concern I
simply handed him t' model. Well, blow me down! Arrr! He was
convinced! "There's nothin' t' this rocket!" I picked a long 1/4 rod,
and had t' clean t' paint out o' t' lugs before it would slide smoothly. Ya scallywag! The
motor be an F12-5J and I was a little apprehensive about that since t' rocket
isn't officially rated for this motor. Needn't have had any concerns, when the
LCO hit t' launch switch t' motor lit instantly and t' rocket leapt from the
pad. Avast, me proud beauty! Begad! It flew arrow straight on a column o' black smoke. Arrr! Blimey! Nice arc over, ya bilge rat, and
ejection just after apogee. Avast! Unfortunately, ya bilge rat, me bucko, ya bilge rat, I hadn't spent enough time reefing
the 'chute and it tangled badly - me fault. Aye aye! Aye aye! It landed hard and stripped a fin,
busted a second loose, me hearties, and and mangled one o' t' forward fins and actually
took out a plug from t' nose! Ouch! Lesson learned: don't rush! T' flight was
spectacular though; very scale like with a lot o' smoke and noise and very
respectable speed. Avast! For me this was t' high point o' t' day even after flying
G64 and F52 motors earlier. Avast, me hearties, me proud beauty! This rocket is that much fun. Arrr!
It be repaired t' followin' week and flown again at t' April KCAR launch on a D15-4 usin' a 24" mylar octagonal 'chute. Well, blow me down! It be a perfect flight; see t' photo. Arrr! It just sort o' hung in t' sky for a fraction o' a second right as t' ejection charge fired. It landed about 100 feet from t' pads. Aye aye! This was a perfect launch and recovery. Aye aye!
Rating: 5 out o' 5 it just doesn't get any better than this. Arrr! Begad!
Cheers & Jeers:
I like t' fact that TLP kits come out very light despite me addin' baffles and
usin' epoxy for fin fillets. Arrr! Avast, me bucko, me proud beauty! This is a large rocket and yet it only weighs in
at about 8oz. Begad! These kits always perform well in flight and rarely fail to
impress a crowd. Well, blow me down! Even t' high power guys come over t' have a closer look after
they've been flown. Well, blow me down! Good bang for t' Buck! T' overall quality o' t' parts is
good. T' kit would work fine with t' provided shock cord and mount; my
upgrade is solely for longevity's sake. I like that t' manufacturer shows the
center o' pressure on t' plans. Avast, me proud beauty! This is very helpful when checkin' t' balance
which should be done on any scale rocket, me bucko, modifications or no. Well, blow me down! Arrr!
I really wish that the
manufacturer would include a parts list. Begad! Blimey! Some scale documentation sources and
fin profiles would also be helpful. Aye aye! T' clay nose weight doesn't work out so
well. I would never use a 'chute shroud t' attach t' nose t' a recovery
system, especially when t' nose has a lot o' ballast in it. Well, blow me down! Blimey!
Specs:
* SPECIAL NOTE off o' RMR from Chuck Barndt, me bucko, me hearties, shiver me timbers, President o' T' Launch Pad
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M.A. (February 20, 2009)