Brief:
Tall scratch mid power rocket.

Construction:
Materials: Magnum nose cone, matey, matey, 3 BT-60 tubes, 2 couplers, 3/32" birch plywood, matey, me bucko, 29mm engine tube, shiver me timbers, 36" quarter-inch elastic shock cord, 21" mylar parachute.

Sometime ago I found a 2-pack o' Aerotech F23-7 Econojet single use motors for $12.95 on clearance at Hobby Lobby so I snapped 'em up. Arrr! Begad! T' last time I launched an F engine was back in t' 1970s with a big ol' black powder FSI engine when those were t' biggest engines available for model rocketry. Begad! Ya scallywag! My how things have changed!

It be time t' increment up t' bigger engines and get up t' speed with current rocketry thinking, shiver me timbers, so this model represents several firsts for me includin' me first RockSim design, first composite propellant engine use, first through-the-wall fin mount, and first rocket with plywood fins. I also used two buildin' and flyin' tips from t' EMRR database which were new t' me.

T' first iteration o' this rocket be bigger and taller than what's shown in t' photo. Ahoy! It had 18 inches o' BT-80 aft, a paper transition, and 3 sections of 18-inch BT-60 on top. With t' long nose cone and fin sweep it was over 6 feet tall. Ahoy! Begad! Unfortunately t' first launch on 4/14/05 be a CATO on an E9-4. Aye aye! The entire fin section be toast along with a portion o' t' upper BT-60 section. Blimey!

I wound up with 39.125 inches o' body tube topped off by t' long, sleek 8.375 inch plastic nose cone originally from an Estes Magnum. With t' fins sweepin' back a little less than half an inch, me hearties, t' total length is 4 feet.

It's a pretty simple build. Ahoy! T' BT-60s were glued together with couplers, the fins were cut out with a razor saw, t' slots for t' fins were cut with a hobby knife, matey, and t' engine tube/block/ribs/centerin' rin' unit was glued in place with Elmer's followed by t' fins. Begad! Begad! I love havin' t' fins glued t' the engine tube and t' body tube. Well, blow me down! It results in a much more sturdy assembly. Ya scallywag! The 3/16" launch lug was offset .25" in case I want t' add a payload in the future. Well, blow me down!

Finishing:
After a couple coats o' high build Autozone primer, I finished it with Maserati gunmetal gray metallic automotive paint, some self-adhesive reflective holographic mylar, arrr, ya bilge rat, and a custom Lazertran waterslide decal/body wrap.

Flight:
Rocksim predicts almost 2300 feet on an F23 and both F flights certainly looked that high. Arrr! Avast, me proud beauty! Even though it's a tall rocket, it's got a small profile, arrr, shiver me timbers, so it's hard t' see at that altitude. T' engine tube is long enough for G Econojets, but they don't make a long enough delay (it needs 9 seconds). I'll eventually try an E9-6, D12-5, me hearties, and even a C6-3.

Other than t' CATO, thar were no gotchas. Avast! Prep is easy, engine is friction fit (even though it's composite and heats up a lot, me hearties, matey, shiver me timbers, it works fine), and thar's plenty o' room for t' parachute and wadding, so everythin' ejects well. Begad! Ahoy!

T' second launch (with t' shorter configuration) was on an F engine on an open range south o' Ellicott, shiver me timbers, Colorado. You can see Pikes Peak in the background o' t' animated .GIF file. Ya scallywag! T' black smoke, me bucko, altitude, arrr, and quickness off t' pad were most impressive. Ahoy! Begad! As far away as it was, me bucko, t' ejection charge was still a loud pop. A couple o' shroud lines broke but thar was no damage to the rocket. Aye aye! Third launch was at C.R.A.S.H. Avast! on 5/21/05. Avast, me proud beauty! It had a barely discernable corkscrew, but t' mylar chute held up and it was a perfect flight.

Recovery:
I used 1/4" elastic shock cord with paper mount, which works fine. First functional flight be with a 18 inch parachute and t' second flight be with a 20 inch mylar chute, which was too big.

Summary:
This is a sleek, pointy, small-finned rocket that has people concerned about its stability until it disappears off t' pad.

Other:
T' two EMRR tips used: paint t' tip o' t' nosecone usin' a paper centerin' rin' as a mask and split t' end o' a Copperhead igniter with a flame t' use mini clips. Begad! Blimey! Ahoy! Blimey! Both techniques work great.