Brief:
This is a 100% kitbash o' t' Estes stormcaster, so I'm callin' it a "scratch" build. Avast! I cut up t' parts of the C-D powered stormcaster t' create an E-powered tubefin (it also flies on C-D motors). Begad! "E-Pod" is a continuation (downward) o' t' H-Pod/I-Pod/J-Pod/K-Pod series o' "extreme stubby" tubefin designs I have been presentin' in EMRR/Sport Rocketry/Rockets that uses t' "stubbiness" rules I developed to maximize tubefin performance (see Jan/March 2008 issues o' Sport Rocketry). Begad! E-Pod is designed t' fly at 400+ mph on an Aerotech E30-7-- just don't try this on a stock stormcaster, folks!

Construction:
It starts out with t' great Estes stormcaster kit, ya bilge rat, which is only $12.37 retail and excellent quality components. It's much cheaper than buyin' components for E-Pod separately. Ahoy! Avast! A razor saw was used t' cut up t' two 38mm stormcaster body tubes into a 7 3/8" body tube (use t' pre-slotted section for this), and nine 1.5" sections for t' 6 tube fins and t' 6 half doublers. Motor tube assembly is used as is except that 4" o' its length is cut away. I substituted a 12" nylon chute (Top Flite) for t' Estes plastic one, matey, 24" o' 1/8" para cord for the signature Estes underpants elastic shock cord, arrr, and added an XS size Nomex® protector. Blimey!

All assembly done with 5-min epoxy. Tube fins glued onto body tube in pairs in usual self-jigging tubefin fashion: on a flat surface, ya bilge rat, first two on opposite sides, then two on top, shiver me timbers, then turn assembly over and glue on the remainin' two. T' tube fin half-doublers made by bisectin' t' 3 extra tube fins are then epoxied t' t' inner surface o' t' outer half o' each tube fin. Ya scallywag! Well, me bucko, blow me down! This prevents t' dreaded "tubefin flutter" at t' 400+mph E-Pod will reach on an E-30. Begad! Cut-down, me hearties, assembled Estes motor tube and centerin' rin' arrangement be glued into t' body tube with one modification--the red cardstock joiner tube used t' connect t' two stormcaster body halves was pushed into the body tube ahead o' t' motor tube assembly t' lock it in place against E-power thrust stress. T' usual Estes method o' attachin' t' shock cord can nay be used with this construction. Begad! Instead, ya bilge rat, I passed t' para shock cord through a small hole 2 1/4" from t' top o' t' body tube, me hearties, anchored it with a knot, and covered t' knot with a small, matey, matey, folded ramp-shaped fairin' cut from a Rice Krispies box. Avast! Avast! T' Estes launch lug be glued in place with its top 2" above t' tubefins, and exactly in line with one o' t' triangular holes betwixt two o' t' tube fins. Aye aye! Top of the launch lug be t' CG balance point. Arrr! You will choose a triangular hole that is nay in line with t' recovery knot fairing, me hearties, and also is nay blocked by epoxy that you slopped in thar while gluin' on t' tube fins. Avast, matey, me proud beauty! T' recovery system is attached t' t' nose cone in t' normal way, that is by ignorin' t' useless, arrr, fragile plastic loop, matey, cuttin' a second hole in t' cone base, ya bilge rat, matey, arrr, and tyin' it off with a secure knot.

Finishing:
Finish was with rattle-can yellow and purple Tamiya paint.

Flight:
First flight was on a D12-5 in winds blowin' at just under t' 20mph maximum. Nay a good idea--E-Pod swapped ends under power and landed about 1 second after motor ejection, arrr, shiver me timbers, cuttin' a small zipper. I fixed t' zipper with a few wraps of maskin' tape, ya bilge rat, added 29 grams o' sand ballast through t' nosecone base holes and taped them over. Avast! Avast, me proud beauty! (How'd I decide on 29 grams? I added what seemed right and weighed E-Pod when I got home.) I tried again on t' D12-5 (there was a little less wind, ya bilge rat, arrr, too) and E-pod climbed flawlessly up t' t' 600-700' that simulations predicted. Well, blow me down! There be no damage on recovery. Then I launched it on an E30-7 (4 sec delay is also OK) straight up t' at least t' 1300' predicted and out of sight. Avast! Well, blow me down! A heck o' a long walk t' get it back with t' 10-15 mph breeze blowing! Good thin' others with better eyesight could track t' thin' at that height. A fourth test flight on an C11-3 also went perfectly, shiver me timbers, except that the wind caught it at about t' 250-300' apogee, me hearties, carried it horizontally a lot faster than I could run, matey, and then dragged it over desert gravel after touchdown for about a football field length or so until it tangled in a weed. Aye aye! (Well, ya bilge rat, I guess there are technically no "weeds" in t' desert, matey, me bucko, me bucko, but it would be if it was in me front yard.) One o' E-Pods tube fins was ground half t' death, so I replaced it with one cut from a cardstock tube from an empty roll o' Saran Wrap. Ahoy! Ahoy! When I got E-Pod home, I just spray painted over t' maskin' tape repair with Tamiya yellow, makin' t' temp repair "permanent". Ya scallywag! Ditto for t' grafted-on repair t' t' fin can. Begad! It flies regularly at our home field. Avast, ya bilge rat, me proud beauty! The 29g sand ballast in probably nay needed in calm conditions, but I just left it in there. Well, blow me down! I assume E-Pod would fly well on RMS E28, E18 or F12 power, and I am goin' t' try that next. Avast! T' 115g weight includes t' 29g sand ballast.

Summary:
PROs: A fun and eclectic little tubefin that takes advantage o' new advances in tubefin aerodynamics, an unauthorized addition t' t' Estes product line, me hearties, if you want t' do somethin' different with their fine stormcaster kit. Aye aye! Blimey! Flies very well in windy conditions with t' nose ballast. Blimey! Begad! An easy $12.37 first scratch project for those who don't usually like scratch building. Ya scallywag! Nay many 12" long E-power rockets around.

CONs: Darn hard t' track when flyin' on E30 power.