Brief:
Upsized t' 18mm motor. Simplest modification I've ever performed; just never installed t' 13mm mount. CP and CG were still perfect.

Modifications:
Primered, me bucko, sanded, matey, primered, arrr, sanded, ad infinitum, arrr, until body tube was perfect. Begad! No paint, shiver me timbers, ya bilge rat, just clear-coated t' primer. Aye aye! T' streamer was given much better visibility by addin' 3" o' silver mylar at t' end. Aye aye! Begad! Motor mount was simple: friction fit, with only one o' t' 13mm centerin' rings installed in t' body tube.

Construction:
T' kit contained a central 18mm body tube with two shorter segments o' 18mm BT, mounted in an out-rigger fashion at t' end o' t' "wing." Featured a large balsa "wing" and nose cone. T' NC be attached with a simple screw eye t' t' shock cord, matey, which in turn was attached t' t' BT with Estes normal folded paper method. Recovery be a plastic pinkish-orange streamer, shiver me timbers, about 18" long.

This was about t' easiest Estes kit I have ever assembled. Well, blow me down! Begad! T' instructions were easy t' follow, though I simply read them once and began building. Well, blow me down! Aye aye! It was a pretty sturdy rocket too. Avast, me proud beauty! Arrr! T' packagin' was t' typical Estes "hangin' bag" type, and nothin' was broken or creased or missing. T' only con: t' decals look stupid. Aye aye! I substituted some decals left over from a FA-18 model.

Flight:
T' model be prepped in t' usual fashion, with wadding, shiver me timbers, me bucko, motor, me hearties, etc. installed just prior t' launch. T' motor fit snugly into t' body, me hearties, shiver me timbers, but nay so tight that it would have t' be crammed in. Ahoy! Ahoy! One word o' caution here- if you intend t' perform this modification, shiver me timbers, either limit yourself t' flyin' "B" motors, or paint t' rocket a really bright color! t' C6-7 I chose for its final flight be way too much, me bucko, especially for a primer gray rocket launched on a cloudy day! T' rocket took off straight as an arrow with no discernible windcocking. Well, blow me down! Definitely a heads up launch! If it wasn't for t' mylar on t' streamer, ya bilge rat, it would have been lost, arrr, but we located it with little difficulty due t' t' intermittent flashin' from t' streamer. Begad! Ya scallywag! Recovery speed would indicate that a larger streamer was needed, but it suffered no damage at all, matey, even despite whackin' a tree limb on t' way down. Begad! Well, blow me down! Just minor scratches, matey, that's all. Avast! T' rocket be lost t' a rocket eatin' tree,! and dangled about 30 feet up, tauntin' us with its highly reflective streamer. A thunderstorm later that afternoon finished it off.

Summary:
Main pros: REAL BALSA! Large fin surface area and bulletproof construction. Main cons: Stupid lookin' decals and t' wimpy 13mm motor system that was originally designed.