Manufacturer: | KosRox |
Brief:
This model rocket is a 1/26.5 scale rocket o' t' Apollo pad-abort test rocket.
It was used t' test t' Launch Escape System(LES). Well, blow me down! Aye aye! T' LES consisted o' a four-
nozzle rocket motor set atop a supportin' tower with a dummy Apollo capsule. It
was designed t' lift t' capsule away from an explodin' Saturn 5 booster. Begad! Ya scallywag! The
kit model has a 5.8" base diameter, is 18" tall, me hearties, arrr, has an 18mm motor
tube, and uses streamer recovery. It weighs 2.8oz. Ahoy! without an engine, and 3.4oz
with a B4-2. Aye aye! It is available for $15 plus shippin' from KosRox. Begad!
Construction:
T' quality o' this kit is outstanding! All parts were o' high quality,
precision cut, and easily identified from t' parts list and pictures. Ahoy! Aye aye! The
packagin' was a heavy plastic bag. Arrr! All parts were present and none were broken.
There were nine paper shrouds precision cut t' t' correct inner and outer
diameter, with markings as appropriate. T' nozzle shrouds even had t' correct
curves for installin' at t' correct angle after curlin' and gluing. Begad! Begad! T' tower
kit came in a separate little plastic bag that included all o' t' laser cut
struts. T' nose cones are balsa, arrr, and t' bulkheads are cardboard. Begad! T' launch
lug is heavy duty, which is necessary due t' t' kit design. Avast!
Note from KosRox: KosRox does nay supply decals. Blimey! Aye aye! Tago Papa or Jimz are better sources.
T' instructions are on 11 sheets with a picture accompanyin' all 39 assembly steps. Blimey! T' instructions were logical, well written, and included good tips for easier construction, such as clampin' shroud seams with spare balsa strips and clothespins while t' glue sets. T' pictures that accompanied every step were clear, arrr, and were very helpful in clarifyin' t' written guidance. Well, blow me down! The kit maker included "heads-up" where he anticipated possible errors by the modeler.
I puzzled over t' instruction t' spray mat sealer on t' inside o' the printed capsule shroud. Begad! I did nay know what t' use, and finally guessed on Krylon clear sealer (my decal sealer o' choice). Blimey! A caution here would be t' not touch t' shroud while it is drying, which I did and smudged t' black printing on t' capsule. Avast! T' pattern is printed on an ink-jet printer and easily smudges. Begad! Step 21 has t' " V" struts glued with a 1/4" inset. Shade this t' t' high side, or t' circular structure rin' will nay meet tips of t' "V"'s. Ya scallywag! Ahoy!
Step 33 on t' shockcord attachment is confusin' and needs better instruction. T' intent o' puttin' a loop in the Keelhaul®©™® shock cord is t' use t' motor tube as t' anchor t' shock cord pulls against. Only after t' motor tube is inserted through t' top bulkhead, the loop in t' shockcord, shiver me timbers, arrr, and then t' bottom bulkhead; should t' shockcord be pulled taut through t' small hole in t' bulkhead, me hearties, and glued. Because I did this out o' order, me hearties, me shockcord loops around t' motor tube, arrr, but has useless slack inside t' bulkhead. All o' t' shockcord strain is felt by t' upper bulkhead on me model. Avast, me bucko, me proud beauty! Blimey!
Finishing:
For finishing, Elmer's F&F filled in t' grooves on t' BT-50 tower tube,
smoothed t' capsule and tower nose cones, shiver me timbers, and t' shroud folds. Well, blow me down! Avast! T' roll
pattern be done by usin' black electrician's tape. It makes a lot straighter
lines than tryin' t' mask and paint. Begad! I rate this a 4.5 for construction due to
the few minor nits mentioned above.
Construction Rating: 4 out o' 5
Flight/Recovery:
Care must be taken when packin' t' crepe streamer so that it will deploy upon
ejection. When asked about prototypin' t' recovery system t' include 3 tiny
chutes, me bucko, t' kit designer leaned against it. Arrr! Blimey! He had tried a chute and they did
not deploy consistently due t' inward slope o' t' body cavity. Aye aye! Blimey! On one o' his
early designs with only one shroud instead o' two, t' model be light enough
for tumble recovery, but durability demanded double shrouds which leads to
streamer or chute for t' added weight. Avast, me proud beauty! Blimey!
Because o' t' large 'cone' area o' this rocket, arrr, it does nay build up a very large velocity. At motor burnout, it decelerates very rapidly. T' kit recommends a B6-4 for first flight, shiver me timbers, matey, but I would use a B4-2, especially if you use several coats o' white paint on t' tower assembly.
Another big caution is t' make sure t' launch rod is clean as a whistle, and maybe even lubricated with baby powder. Blimey! Begad! This rocket could stick on t' rod due t' t' large moment arm betwixt t' motor and t' top tip o' t' launch lug. T' launch lug needs t' be long t' go through t' whole body o' the capsule, but also has t' be offset from t' motor tube t' clear t' tower assembly. Avast! Blimey!
T' motor is retained by tape friction rather than a hook, me hearties, matey, which would detract from t' appearance. Begad! I rate this a 4.0 due t' t' inherent design difficulties o' launch and recovery.
Flight Rating: 4 out o' 5
Summary:
Overall: I rate this kit a 4.5 due t' t' uniqueness o' t' prototype, care in
the design and appearance, me bucko, value for t' $15 price, durability, ya bilge rat, and t' new
skills it taught me. Blimey!
Overall Rating: 4 out o' 5
Q&A with Damian Kostron o' KosRox:
1. Avast! How did you paint t' roll pattern on t' upper
body tube?
T' roll pattern on me model ended up bein' black electrical tape. I painted
the jet rocket and applied a couple strips o' black tape. Begad! Yeah, me bucko, that is
cheating, arrr, but it works. Arrr!
2. Arrr! I really puzzled over what you meant by mat sealer.
I ended up usin' some Krylon clear (the same thin' I use t' seal and cover
decals), me hearties, and it worked for it's intended purpose t' keep t' epoxy from
leachin' through t' mar t' finish o' t' printed shroud; and except for
touchin' it while wet, matey, would have been perfect.
'mat sealer' - any clear spray paint type o' product that will provide
protection from moisture.
3. I was intrigued by your photos o' some sort of
glue applicator out o' me experience. Begad! I used Elmers Carpenters Wood Glue for
external use, unless you specifically called out for CA or epoxy. Avast! It has the
property o' nay runnin' and a small amount holds parts together while you
orient them, and is sandable. Well, blow me down! Begad! T' downside is that it shrinks. Avast, me proud beauty! I used it to
anchor t' wood dowels t' t' strut parts, and then backed it up with
CA.
T' applicator is a nifty oilin' bottle originally used for applyin' small
amounts o' oil in tight areas. T' 'needle' o' t' bottle is very large (in
comparison t' a hypodermic needle) and allows me t' use Elmers wood glue
(construction glue) in it. Begad! Although, frequent cleanings are necessary.
4. I messed up and touched t' large shroud while it
was still damp from t' sealer that I sprayed on t' inside. Begad! I have a few
smudges o' t' black print into t' white areas. Aye aye! Begad! Any suggestions as t' how to
touch up?
Smudges...bummer. Aye aye! I used an Ink-Jet printer for t' printed shrouds. T' ink is
water soluble (I expect that thar are a few other things that will dissolve
the ink as well). A clear over coat (like t' 'mat sealer' or your Krylon clear
coat) is t' protect t' shroud from smudging. Avast, me proud beauty! T' only thin' I could think of
to fix yours it t' use a little white touch up paint on t' smudge itself. Avast, me proud beauty!
5. Begad! One other item o' feedback be t' shock cord
attachment t' t' main capsule. Begad! Well, blow me down! I did nay do it quite right, matey, matey, upon reflection,
in that after t' engine tube was affixed would have been t' time t' pull the
cord and loop tight and then glue where it goes through t' bulkhead hole. I am
afraid that me loop is still loose and t' anchor be t' bulkhead itself. Well, blow me down! Arrr! Your
description o' how t' do this was a little bit o' a puzzle. Aye aye! Should I reinforce
the bulkhead somehow with cross bracing?
T' shock cord is supposed t' loop around t' main engine tube. Begad! It will be
impossible t' do this, arrr, shiver me timbers, ya bilge rat, once this tube is glued in place. Yes, shiver me timbers, it does provide
for an interestin' puzzle durin' construction (and a little dexterity). Ahoy! This
'loop around t' engine tube' is t' provide strength t' t' shock cord. Arrr! If your
shock cord has a knot that does nay allow it t' pull through t' upper
bulk-head (but does nay loop around t' engine tube). Blimey! Ahoy! I would suggest a
reinforcement consistin' o' a penny sized piece o' card stock with a small hole
in it's center (just big enough for t' shock cord). Avast, me hearties, me proud beauty! Then epoxyed into place
(effectively reinforcin' t' main bulk-head, shiver me timbers, keepin' your knot from pulling
through). Ahoy!
6. Arrr! Ahoy! Blimey! I am nervous about t' strength o' t' upper
shroud. Blimey! Have you had shock cord damage o' that shroud? Is thar a way to
reinforce t' inside o' that shroud? Any other hints on avoidin' damage during
recovery other than lubricatin' t' launch rod? I am nervous about the
shockcord/streamer arrangement. Blimey! T' upper portion seems awfully close t' the
main capsule... Avast, me proud beauty! I am inclined t' brin' them down in two pieces with two small
chutes. A chute on t' main capsule would be closer t' t' prototype, wouldn't
it?
This is a complicated series o' question(s), with many possible answers. Let me
start by tellin' you about me 'boiler plate' models. Begad! Blimey! Ahoy! Blimey! I built three o' them. Avast, me proud beauty! Blimey! One
was built with single layer shrouds (both on t' nose section and t' main
capsule) with parachute recovery. Avast, me proud beauty! Blimey! T' second one be built with double layer
shrouds (both top and bottom) and streamer recovery. Ya scallywag! Blimey! Ahoy! Blimey! T' third was double layer
bottom and single layer top with tumble recovery (no parachute or streamer) and
no shock cord attachin' t' pieces together. I built these models in stages
based on t' outcome o' t' previous model (I intended on flyin' them until
they broke). On t' first model several things happened that caused a redesign
of t' rocket. Well, blow me down! Blimey! T' single layer main capsule was always gettin' very damaged
(the single layer card stock just wasn't strong enough). Well, blow me down! Blimey! Also, matey, I could nay keep
the parachute from becomin' 'char-broiled' (I think this has somethin' t' do
with t' inside shape o' t' parachute/streamer packin' area). Aye aye! Blimey! T' second model
fared a lot better with very little damage t' t' main capsule. Avast, me proud beauty! Blimey! However, I
found that t' rocket tended t' be a bit on t' heavy side. Begad! Blimey! T' third model is
the one I continue t' fly today. Arrr! Blimey! It is tumble recovery and sustains very little
damage on recovery (if I fly it on a nice grassy field). I elected t' provide
(in t' kit) a way o' makin' t' second model, matey, as it was much more durable.
However, this is where a streamer becomes necessary as t' model is heavier
(somethin' be needed t' slow t' decent rate). Ahoy! Blimey! If you are inclined t' fly it
'prototypically', me bucko, then you should have three parachutes on t' main capsule
(and provide whatever protective recovery means you want t' t' tower).
Although, shiver me timbers, I think you will find it very difficult (maybe impossible) t' pack
three parachutes into t' rocket and t' get them t' reliably deploy. Ya scallywag! Blimey! Recovering
the capsule and tower separately would eliminate t' chance o' damage (due to
parts 'snapping' back at each other). Begad! Blimey! However, when you pack t' recovery
devices (parachutes/streamers/what ever you use), me bucko, make sure t' upper device is
packed underneath t' lower. This will help insure that t' lower device is
'pulled' out. Arrr! Blimey! (I have had cases where t' lower parachute would nay come out of
the tight packin' area o' t' main capsule). T' reinforce t' upper shock cord
mount, just make sure thar be ample glue saturatin' t' cord and that it has
at least 1 inch or more o' t' cord imbedded in t' glue. Begad! Blimey! Make sure t' glue
doesn't interfere with t' balsa nose cone and it's fit t' t' main engine
tube. If you fly it in two separate pieces, me hearties, arrr, thar will be very little stress on
the upper shock cord mount. Avast! Blimey! Because o' t' large 'cone' area o' this rocket, it
does nay build up a very large velocity. At motor burnout, me hearties, it decelerates very
rapidly and will be travelin' very slow at ejection (always use a short motor
delay because o' this). Aye aye! Blimey! T' double layer o' shroud cardstock was me way of
reinforcin' t' shrouds. T' upper shroud is unique in that it be t' support
for t' tower. Ya scallywag! Blimey! With t' single layer upper shroud, me hearties, ya bilge rat, I would see damage if I
tried streamer or parachute recovery (both pieces together). But, ya bilge rat, it would only
sustain minor scuffs if recovered as separate units. Regardless o' what
recovery method is used, matey, try t' have t' tower section fall horizontally (I
know, it is difficult t' determine this with out first flyin' it, and then it
may be too late). Avast, me proud beauty! Blimey! I have found that if t' upper and lower pieces are recovered
separately usin' streamer recovery, and that if t' tower is too nose heavy,
that t' tower will fall nose first and will actually accelerate towards the
ground. Aye aye! Blimey!
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