Brief:
This is a very sturdy 4 inch diameter, me hearties, ya bilge rat, 39 inch tall advanced model rocket made by AeroTech. Aye aye! Avast, arrr, me proud beauty! It is a stubby model capable o' handlin' anythin' from G t' H power, ya bilge rat, sports piston ejection, shiver me timbers, and comes equipped with a 29mm motor mount. Begad!

Construction:
T' component list for this rocket is:

• 1 4 inch diameter, 23 inch long pre-slotted cardboard body tube
• 4 pre-shaped plastic fins
• 1 12 inch long, cardboard motor tube
• 1 16 inch long plastic nose cone
• 1 piston cap
• 1 piston sleeve
• 1 motor hook
• 2 four-fin FIN-LOK rings
• 3 centerin' rings
• 1 bulkhead disk
• 1 spacer, HP motor (black tube)
• 1 spacer, me hearties, Hobby motor (yellow tube)
• 1 ejection gas baffle
• 1 screw eye
• 1 18' long by 5/8" wide elastic shock cord
• 1 two ¼ inch launch lugs
• 1 42 inch diameter hexagonal nylon parachute
• 2 piston buckles
• 1 decal sheet
• 1 instructions

This rocket be an absolute dream t' assemble. Begad! I have already built two AeroTech kits, so I could have built this without t' instructions. However, ya bilge rat, I chose t' use them because I am cautious about every rocket I build. Aye aye! I did modify t' rocket a bit after it wounded itself a couple o' times. Arrr! Those modifications will be explained in t' flight portion o' this review. Begad! T' instructions tell you t' use CA glue for t' construction, but I used 5 minute epoxy which worked great. Begad! T' instructions were thorough and had some good accompanyin' illustrations. Blimey! Begad! The construction started with t' motor mount. Avast! T' motor mount tube has a pre-drawn line down its length, allowin' you to make precise measurements on t' tube. Begad! T' middle centerin' rin' is slid onto t' "back end" o' t' motor mount tube with t' motor hook under it (unlike on Estes rockets, me hearties, t' tab on t' motor hook that would normally go through t' motor tube goes t' "wrong" way so that it hooks behind t' middle centerin' ring, makin' a very solid attachment o' t' hook). Ya scallywag! T' front FIN-LOK rin' is slid onto t' tube so that t' back edge o' it is 4 inches from t' "back end" o' t' tube. T' aft FIN-LOK rin' is then slid on until it's front edge is 1-15/16" from t' back end. Begad! Begad! T' FIN-LOK rings must be aligned, shiver me timbers, otherwise t' fins will nay fit. All these components are glued into place--and don't get glue in t' FIN-LOKs! T' ejection gas baffle cap is then glued into t' opposite end o' the tube, ya bilge rat, me bucko, and t' forward centerin' rin' is glued on top o' t' baffle cap. Avast! T' motor mount assembly is inserted into the slotted end o' t' body tube and t' FIN-LOK rings are lined up with t' slots. Begad! Aye aye! Glue is applied t' t' whole root edge o' one fin, t' fin is inserted into one o' t' slots, shiver me timbers, shiver me timbers, and it is snapped into t' FIN-LOK rings. Begad! T' same is done for t' other three fins. T' fins are filleted with glue and internal fillets are applied inside t' fin-can. T' rear centerin' rin' is then slid into place and glued. Begad! On t' forward centerin' ring, an airtight seal o' glue is applied in order for t' piston ejection system t' work properly. Aye aye! Tie t' shock cord t' t' screw eye, screw it through the bulkhead disk, me hearties, and then screw it into t' baffle cap on top o' t' motor mount. Avast, me proud beauty! T' piston cap is glued into t' piston sleeve an eighth o' an inch from one end o' t' sleeve. Begad! T' piston is then fastened t' t' shock cord with two plastic buckles. Well, blow me down! You will probably notice that t' piston is too large t' fit into t' body tube at this point. Since I have read t' other reviews for this rocket, arrr, I was nay surprised at this. Avast! I do nay think that an "advanced model rocket" such as this should be able t' be assembled in one's underwear, arrr, standin' on one's head, and with one's hair ablaze (in other words, me bucko, ya bilge rat, "should nay be easily assembled"). Arrr! A little sandin' never hurt anybody. I would recommend primin' and sandin' t' piston smooth after gettin' it t' right size t' remove t' "fuzzies" and make it smoother. Ya scallywag! Lastly, t' nose cone and parachute are then attached t' t' shock cord. Avast! My rocket weighed in at 38 ounces. Ya scallywag! Well, blow me down! That's it for construction!

Finishing:
Finishin' couldn't have been simpler. Ahoy! Aye aye! Since t' instructions just say, "paint this red, me hearties, paint that yellow," and because New Holland is a company which sells farm equipment that is painted red and yellow, arrr, I decided t' have a little joke with t' paint on this rocket. I primed and sanded t' rocket several times but did nay fill t' spirals as they are nay deep. Ahoy! Well, matey, blow me down! I then proceeded t' paint t' fins New Holland yellow, nay protectin' anythin' from t' overspray. Avast! I scuffed t' yellow overspray on t' rocket with 400 grit sandpaper, masked t' fins, and painted t' rest o' t' model with New Holland red. Arrr! I allowed t' paint about a week t' fully dry and de-gas before applyin' t' self-adhesive decals. Blimey! I cut out t' decals, arrr, dipped them in slightly soapy water, ya bilge rat, matey, and applied them t' t' rocket. Blimey! T' finished result was fabulous!

Construction Rating: 5 out o' 5

Flight:
Now for t' really good stuff--the flying! Blimey! Blimey! Blimey! I now have five flights on t' rocket, and it is scheduled for three more at our next launch. Begad! Blimey! Blimey! Blimey! T' first flight be on a single use G79-4W. Begad! Blimey! Blimey! Blimey! Instead o' usin' a maskin' tape thrust rin' (ugh!) as outlined in t' instructions, shiver me timbers, I used a piece o' PVC pipe with an inside diameter just large enough t' fit over the motor's forward closure and long enough so that when it butts up against t' baffle cap (used as a thrust ring) the motor is retained by t' motor hook. I also put a small amount o' sheep wool waddin' around t' baffle cap t' lengthen t' shock cord's life. Ya scallywag! Blimey! Blimey! Blimey! Since its readily available, I use unwashed sheep wool for me recovery wadding. Avast, me proud beauty! Blimey! Well, blow me down! Blimey! Blimey! Blimey! It is flameproof, cheap (in me case its free), and easy t' use. Avast, me proud beauty! Blimey! Blimey! Blimey! Unlike toilet paper or tissue which smolders when blown upon, sheep wool is put out by t' slightest breeze (if you can even get it t' catch fire). Arrr! Blimey! Blimey! Blimey! T' first flight was spectacular: huge roar, matey, ya bilge rat, long cracklin' white flame, tons o' billowin' smoke, shiver me timbers, and about 900ft AGL. Begad! Blimey! Avast, me bucko, me proud beauty! Blimey! Blimey! Blimey! T' delay was right at apogee, the chute inflated, and it touched down without a scratch about 300 feet away. Avast, matey, me proud beauty! Blimey! Blimey! Blimey! AeroTech advertises this rocket as "a short, fat rocket with slow lift-offs." On t' G79W it went quite a bit faster than I would call "slow," but that's just me opinion. Begad! Blimey! Avast, me proud beauty! Blimey! Blimey! Blimey!

T' second flight (on t' same day) was on a G38-4FJ. It be nay nearly as loud as t' previous flight, but it was what I would call a slow liftoff. Ejection occurred just as t' model turned nose down (about 550ft), t' parachute opened, but it somehow got tangled around t' piston, ya bilge rat, shiver me timbers, reefin' t' chute slightly. Avast, me proud beauty! It landed with a bounce about 150 feet away. Blimey! One fin fillet was cracked and t' aft end o' t' body tube had a large crescent shaped din' in it. Avast, me proud beauty! Aye aye! I used a piece o' 4" tube coupler t' reinforce t' tail end o' t' rocket, put epoxy over t' cracked fillet, and added about 3 ounces o' nose weight (I was afraid that t' tube coupler would hurt t' rocket's stability). T' rocket then weighed about 43 ounces. Aye aye! Begad!

T' third flight be on another G79-4W with t' same great flame, smoke, arrr, and roar as on t' first flight. Ahoy! Blimey! It was noticeably slower off t' pad than before and t' ejection was right on. Avast! Blimey! T' peak altitude be around 800ft. Ya scallywag! Blimey! The 42" parachute was too small for t' heavier weight o' t' rocket, and it recovered about 300 feet out with a cracked fillet (the same one that I repaired) and a kink in t' tip o' one fin. Begad! Blimey! Ya scallywag! Blimey! It be time for more mods. Ya scallywag! Blimey! Begad! Blimey!

I unscrewed t' screw eye from t' baffle cap and noticed that t' bulkhead disk be slightly charred. Ahoy! Ahoy! So I cut out a piece o' flat tin t' same shape as t' disk and epoxied t' tin onto t' disk t' keep it from burning. I then epoxied t' screw eye into t' baffle cap. T' shock cord is now attached via a quick link. I also scrapped t' elastic cord and used a piece o' 3/16" nylon rope instead. Aye aye! For those o' you who don't like rope for use in rockets, ya bilge rat, just think about this. Begad! Ya scallywag! What be t' rope tied to? In me rocket's case, me bucko, its tied t' a quick link which has a tensile strength o' 220lb. Well, blow me down! What be t' quick link attached to? A mild steel screw eye which has a tensile strength o' under 100lb. Begad! This screw is in turn screwed into a piece o' plastic (the baffle cap). Since this recovery system be designed t' work in this rocket, a piece o' tubular nylon capable o' withstandin' two tons o' force is nay needed. Arrr!

T' piston is now modified with a long nut, shiver me timbers, washer, and 2 eye bolts so that t' shock cord is actually in two sections: one from rocket t' piston, shiver me timbers, and t' other from piston t' nose cone. Ahoy! Ya scallywag! T' eye bolts only need t' be unscrewed to remove either section o' t' shock cord from t' piston. Ya scallywag! Arrr! I also made a 60 inch diameter parachute out o' red ripstop nylon t' be used instead o' t' kit's 42" one. Since this chute is so huge, I turned t' piston around so that the piston cap faces t' tail end o' t' rocket instead o' t' nose end. Blimey! Begad! This gave me a lot more room, but it still wasn't enough t' fit t' parachute.

I cut off t' bottom o' t' nose cone so t' shoulder is now only 2 inches long. Blimey! T' nose cone had a pronounced wiggle after this. I then made a bulkhead plate with a U-bolt for shock cord attachment out o' ½" plywood, inserted it as far as I could in t' nose cone, and epoxied it firmly in place. Arrr! Avast! T' chute now fits easily. Ahoy! T' bulkhead be also slightly out-of-round which eliminated t' aforementioned pronounced wiggle o' t' nose cone. Blimey!

I also made a cool way t' retain your RMS casing. Avast! I cut out two strips o' aluminum sheet 3/8 inches wide by about 2-¾ inches long. Blimey! I marked a line on each one about ½ inch from one end and made a 90 degree bend at this line. Blimey! Aye aye! I then drilled two 1/16 inch holes in t' long ends o' t' resultin' "L" shaped pieces (all o' these measurements are approximate because t' device is permanently installed in t' rocket and I didn't write down the actual measurements). Blimey! I procured two screws and in t' short end o' each piece drilled a hole slightly smaller than the diameter o' t' screws. Ya scallywag! Begad! With t' same drill bit I then drilled two holes in t' aft centerin' rin' about ¼ inch away from t' motor tube on each side is such a way that they did nay interfere with t' operation o' t' motor hook. I then inserted me "L" shaped brackets into t' tail o' t' rocket short end down and screwed them into the rocket by hand. T' result is two posts with holes in them stickin' above t' motor tube. Begad! In t' flange on t' aft closure o' me RMS casing, arrr, I drilled two holes which line up with t' holes in t' brackets. Begad! If done correctly, this system allows t' motor t' be smartly and easily safety wired into t' rocket, matey, eliminatin' any chance o' t' casing ejecting. Ahoy!

Instead o' t' yellow, matey, poor fittin' cardboard spacer supplied with t' kit for use with t' RMS casing, me hearties, shiver me timbers, I had my dad make an aluminum one on t' lathe which fit perfectly. You will also notice that t' instructions recommend wrappin' maskin' tape around t' junction betwixt t' motor tube and t' aft end o' t' motor with maskin' tape to, "prevent any ejection gas from escapin' around motor." This is a totally unnecessary step. Avast, me proud beauty! Avast, me proud beauty! If t' ejection gas "wants out" it could just escape through t' nozzle, but this is 4F black powder we are talkin' about. Blimey! Arrr! It pressurizes too rapidly t' waste time goin' through tiny holes. Avast, me proud beauty! Begad! If t' piston doesn't move and t' motor stays in, the ejection gas will over-pressurize t' motor/body tube, ya bilge rat, and make an escape hatch through t' motor/body tube. Begad! With all these modifications, shiver me timbers, t' rocket weighed 49.6 ounces.

T' first flight after these modifications was on a G64-4W. Aye aye! Blimey! T' sound, flame, ya bilge rat, ya bilge rat, and smoke from this reload were awesome! Blimey! It went maybe 500ft. Well, blow me down! T' rocket performed a slight lean with t' wind, me hearties, me hearties, me parachute deployed at apogee, me bucko, matey, arrr, and t' rocket floated down very slowly about 200 feet away without a scratch on it. Ahoy!

T' next flight (on t' same day) was on a single use G77-4R. Blimey! I doubt that it made 500ft; it looked more like 400. T' red flame was marvelous and t' noise was thunderous! It again did its lean with t' wind. It recovered closer this time about 150ft away.

I intend t' fly it on a Cesaroni 3 grain G106 Skidmark at t' next launch. Well, shiver me timbers, blow me down! That oughta be killer!

Recovery:
Recovery, as already discussed, ya bilge rat, ya bilge rat, was great on most o' t' flights, shiver me timbers, me hearties, with only 2 issues. Ahoy! Begad! T' oversized parachute will hopefully eliminate any future landin' injuries t' t' rocket. Avast, me bucko, me proud beauty!

Flight Rating: 4 out o' 5

Summary:
T' Sumo is a great rocket all around. Arrr! I'm only 14 years old, and I was able t' assemble it with ease. Ya scallywag! Well, me bucko, blow me down! It's big, fat, loud, and crowd pleasing. Ya scallywag! I highly recommend this rocket t' anyone wantin' t' get into mid or high power. Blimey!

Overall Rating: 5 out o' 5