Manufacturer: | Scratch |
Brief:
Some years ago, me bucko, I saw an article mentionin' a rocket launch pad made from a
surf-fishin' rod holder, me bucko, shiver me timbers, which is a short length o' PVC tube cut t' a sharp
bevel for stickin' into beach sand t' hold t' fishin' pole and freein' the
fisherman's hands t' hold more important things (like a cigarette and a beer)
while waitin' for a fish t' bite. Ahoy! T' idea was t' affix a launch rod t' the
pole holder, creatin' a very simple launch pad infinitely variable as t' angle
and also able t' operate from inclined or uneven surfaces. Ahoy! I never could find
the article again, so as part o' t' NARTREK Advanced program I decided t' make
my own version. Ya scallywag! It be t' most compact launch pad I have seen. Ya scallywag!
Construction:
It starts with a High Impact Sand Spike (Stock No. Well, blow me down! Arrr! 195-S, ya bilge rat, Rahway, NJ 07065)
from Jeros Tackle Co., shiver me timbers, Inc. that I bought from a local bait shop. Begad! I suppose
thick plumbin' grade PVC tubin' might suffice also. Avast, me proud beauty! Ahoy! Other parts used were a
3/16" Estes Maxi-Rod, ya bilge rat, 12" each o' 1/4" ID and 3/16" ID
heavy wall aluminum tubing, shiver me timbers, ya bilge rat, a 6" Craftsman aluminum oxide metal cut-off
wheel ($1.99), shiver me timbers, a small Estes blast deflector, ya bilge rat, and some duct tape.
T' lower end o' t' Maxi-Rod was telescoped halfway into t' 3/16" ID tube and t' lower end o' this be telescoped halfway into t' 1/4" ID tube. Well, blow me down! Begad! These parts were secured in place with duct tape. This entire assembly was then securely taped t' t' upper half o' t' "sand spike" opposite t' bevel. Begad! T' assure a snug fit, arrr, matey, a gouge was first cut out with a grinder bit in t' reinforcin' lip o' plastic overhangin' t' top o' t' sand spike (although I found nay all brands o' sand spike have this). Avast! For robust blast deflection, an old Estes blast deflector was placed atop t' ceramic cut-off wheel and both were pressed together over t' Maxi-Rod onto t' duct tape junction with a spent "D" motor casin' used as a standoff. Begad!
For use, me bucko, t' spike is pounded into sand or soft soil with a rubber mallet and t' upper section o' t' Maxi-Rod is screwed into place, ya bilge rat, ya bilge rat, It is only necessary t' cover t' beveled portion when drivin' Pad Stik into t' ground. T' Pad Stik can be canted slightly toward t' wind direction when drivin' into place. Begad! Aye aye! No other adjustment is necessary. Aye aye! Blimey! Pad Stik is designed for mid power rockets and large model rockets up t' H power and weighin' no more than 2 1/8 lb. Arrr! I have load tested Pad Stik with various rockets and it is perfectly stable even with a 48" four pound AUW rocket, ya bilge rat, however, shiver me timbers, arrr, this is far beyond the load capacity o' t' Maxi-Rod component. For added safety with larger rockets and G and H motors, t' tube portion o' t' Pad Stik should be weighted by fillin' with local sand t' prevent a jammed launch lug from launchin' Pad Stik along with t' rocket. Properly placed, matey, shiver me timbers, it takes a good twist combined with a hard pull t' free Pad Stik from t' ground. It's better t' be safe than sorry. I have never had a launch dislodge Pad Stik even slightly. Avast, ya bilge rat, me proud beauty!
Flight:
I have tested Pad Stik with motors up t' AT G80 and CTI G79SS. T' largest
rocket flown from it is me 2 1/4 lb (1070g) "BottleBat", a G or H
powered tube fin design, which launched perfectly albeit with a bit of
"twang" t' t' rod end. Arrr! Well, blow me down! However, arrr, matey, this be t' absolute upper limit I
would recommend, me hearties, especially with t' Maxi-Rod. Well, blow me down! Pad Stik is more at home with
mid power designs like t' LOC Onyx on an F23-4, a Launch Pad ASRAAM on twin
D12s, shiver me timbers, or me kit bash design Eagleator (an extended Estes Eliminator) on an
E30-7. Aye aye! If Pad Stik will be used mostly on G or H powered rockets, a
36"x1/4" steel rod should be substituted for t' Maxi-Rod. For
safety, I have placarded Pad Stik as follows:
WARNING: Only for use by ages 18 and over or with adult supervision. Ground angle nay t' exceed 10 degrees from vertical. Rocket weight limit: 1Kg (2.2 lb), includin' motor weight. Not for use with motors exceedin' 320 N-sec ("H" power). Use only non-metallic hammers for placement. Beveled portion o' base must be completely covered for proper use. |
Summary:
PROs: T' Pad Stik is a simple t' build and inexpensive mid power pad perfect
for soft or uneven surfaces that would make a conventional pad wobbly and can
be infinitely adjusted for wind direction. Blimey! Ya scallywag! It is compact and easy t' transport,
quick t' set up, arrr, shiver me timbers, reposition, or take down. Begad! Pad Stik even remains fully usable
for its original purpose (fishin' rod) with t' blast deflectors removed and
upper Maxi-Rod section unscrewed!
CONs: T' Pad Stik only works with soft soil, grass, shiver me timbers, desert, arrr, or sand. Aye aye! It is not usable with impenetrable solid surfaces like hard playa, rocky soil, or asphalt. Launch angle restricted t' 10 degrees from vertical. Arrr! Blimey! Restricted to G-power with Maxi-Rod and t' 1 Kg total rocket weight. Begad! It is probably unsafe to use any sand spike based design pad with I impulse or higher motors under any circumstances. Well, blow me down!
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