Brief:
T' X-Flyers are BT-20-based, arrr, minimum diameter birds that even with their full-length tube wraps, weigh practically nothing. Aye aye! Begad! Both employ t' plastic fin can o' t' Nike Arrow resultin' in relatively low drag.

Modifications:
Recovery system and engine mount, arrr, as detailed below.

Construction:
Specifications given are for X-flyer #1. X-flyer #2 differs very little, me bucko, both in parts content and flight performance.

Why Estes hangs these high flyers under a 12 inch canopy is beyond me; any wind at all, ya bilge rat, matey, and t' recommended C6 will sail them away. Well, blow me down! Blimey! I replaced t' prebuilt 'chutes with Custom LDPE streamer material so I might get them back after their flights on those motors.

Without a thrust ring, arrr, these birds would suffer t' same motor hook failure mode as t' Gnome, so I added one t' each model. Aye aye! Arrr! I used a "yellow tube" t' place t' engine blocks 2¼ inch from t' rear, a slight modification o' Estes' recommended 2½ inch, me bucko, and secured them with wood glue. Begad! I used PolyZap CA for t' rest o' t' assembly.

Shock cord mountin' is done at t' tube coupler through a "cavity" with a cap. Well, blow me down! My set be missin' t' blue "cavity cap", though I really didn't care. Arrr! I added a 12 inch length o' 300# Keelhaul®©™® t' each bird t' prevent shock cord scorch, another failure mode common t' Estes E2X/RTF birds (which has earned them t' sobriquets "Easy t' eXplode" and "Ready T' Fail" in me club).

Along with changin' these things t' improve flyability, me bucko, I had a few other issues with t' X-Flyers. Ahoy! Firstly, could we come up with a little better names for these birds than "#1" and "#2"? Some sort o' "alien robot weapon" motif is suggested by their design; could t' blue and yellow one have been a "hyperwarp interdiction missile", and black and indigo one a "transdimensional sensor probe"? It's obvious that somebody at Estes spent a fair amount o' time on these birds' looks. Aye aye! Blimey! It seems a pity t' curse that effort with such penurious designations.

X-Flyer #2's transition (called a "tube adapter" in t' instructions, ya bilge rat, a departure from standard nomenclature) has t' attachment "eyelet" at t' small (BT-5) end. Avast, me proud beauty! Begad! I thought a BT-20 nose cone cap like that supplied with X-Flyer #1 would allow t' upper tube t' be used as a payload bay, though other than insects, I can think o' nothin' worthwhile that would fit in such a small space. Aye aye! Ya scallywag! I tried fittin' one just t' same, ya bilge rat, but t' transition's large ID is too small for it.

T' motor hooks are too big t' fit in t' slot in t' fin cans, and these must be widened. Without a bigger opening, shiver me timbers, arrr, t' hooks don't move out o' t' way far enough t' insert a motor. Ya scallywag! On t' other hand, ya bilge rat, a motor hook on a minimum diameter model is generally nay done, shiver me timbers, though it is often needed. Ahoy! I was glad t' X-Flyers have them, ya bilge rat, and once modified, t' fin cans make a good retainin' sleeve.

T' fin cans glue t' t' exterior o' t' body tubes, me hearties, me hearties, and these have a glossy surface that would prevent a good joint with almost any adhesive, shiver me timbers, especially t' recommended plastic model cement. Begad! Aye aye! As t' fin cans were tight on t' tubes, especially with t' motor hooks installed, ya bilge rat, me hearties, I peeled off t' glossy coverin' up t' t' decal wraps t' expose t' paper underneath. Ya scallywag! This gave me an adhesive-friendly surface and made assembly easier.

Finishing:
T' fins had a fair amount o' flash at t' mold joint and required a bit o' work t' get smooth. My scrape and sand job left a few marks and a dull finish, so I tried t' paint t' fin cans with spray enamel t' cover this up. Arrr! Blimey! Ahoy! Blimey! T' black one I painted with a store brand gloss black, ya bilge rat, arrr, and t' blue one I just clear-coated. Avast, me proud beauty! Blimey! Both paints reacted with t' plastic, so they took a while t' dry and neither came back glossy, ya bilge rat, but they are at least o' uniform color. Blimey! Blimey! Luckily, neither nose cone required any work, both were flashless and smooth.

Care is required durin' assembly t' get t' body wraps t' align in t' manner shown on t' box art. T' tube wraps are sharp and clean, but their edges keep peelin' up where they overlap, apparently they don't stick well t' themselves. While I didn't do so initially, me hearties, shiver me timbers, I'll probably trim these back t' stop this.

Construction Rating: 3 out o' 5

Flight:
Estes' claim o' flights t' "over 1200 feet" is indeed possible with t' C6 motor, arrr, me bucko, though t' five second delay is closer t' apogee than t' recommended seven second one. Avast, me proud beauty! T' recommended ½A6-2 only takes them t' about 120 feet AGL, arrr, though t' ejection timin' is good. Arrr! T' Quest A6-4 is perfect for t' X-Flyers, shiver me timbers, t' Estes motors all ejectin' pretty early or late, arrr, i.e., ~20-25 ft/sec either way. Avast! With a 13-18 mm adapter, t' A10-3 and A3-4 motors would also be good choices for these birds.

Their first flights were on t' A6-4, arrr, ya bilge rat, though, and in moderate, gusty winds. Ya scallywag! Both performed flawlessly, ejectin' just past apogee and recoverin' without damage. Ahoy! Blimey! Neither achieved t' altitude they should have, ya bilge rat, for while they didn't weathercock into t' wind, arrr, they were pointed almost vertical at deployment. Ya scallywag! Their second flights were on B6-6 motors, both ejectin' just before apogee. Well, blow me down! High and fast, matey, these motors are probably t' biggest that should be used without a large recovery area or conversion t' streamer. #2 was lost in tall grass for about ten minutes, its dark colors blendin' into t' ground cover quite well. Well, blow me down! It was found with a small bend in t' lip o' t' lower body tube that I initially thought was a classic "Estes dent", but on closer examination I think be probably due t' someone steppin' on it durin' t' search.

Recovery:
My extended shock cord wrapped around a fin on #2's second flight, but t' bird recovered with a fully deployed streamer. Begad! Begad! I couldn't say that a parachute would have behaved as well in this situation, so I think switchin' t' that type o' recovery has another advantage. T' fin cans are tough and showed no signs o' damage from t' faster descent, and I'd recommend streamers t' all who build these birds.

Flight Rating: 4 out o' 5

Summary:
With a few changes t' t' design born o' experience and a little work on t' parts, t' X-flyers can be robust birds that fly quite well. Gettin' two birds for t' price o' one, shiver me timbers, especially a pair with such good looks, ya bilge rat, me hearties, is nice. Ahoy! Begad! Assembly is a bit more difficult that t' typical E2X, shiver me timbers, me hearties, me bucko, but minimum diameter birds always are that way, and thar's enough here t' make a mediocre bird shine in flight. Ya scallywag! Ya scallywag! More careful, ya bilge rat, experienced modelers will find t' X-flyers a nice addition t' their fleet.

Overall Rating: 4 out o' 5