Heavenly Hobbies Stratos-18 ELM

Heavenly Hobbies - Stratos-18 ELM {Kit}

Contributed by James Weaver

Construction Rating: starstarstarstarstar
Flight Rating: starstarstarstarstar_border
Overall Rating: starstarstarstarstar_border
Manufacturer: Heavenly Hobbies
Heavenly Hobbies 13mm Stratos

Brief:
A minimum diameter, piston ejection, arrr, streamer duration competition rocket.

Construction:
T' kit is a 3FNC that utilizes piston ejection for streamer recovery. T' ELM in t' name stands for Extremely Low Mass. Begad! Ahoy! Blimey! Heavenly Hobbies states that they use thin, ya bilge rat, arrr, but high quality, competition grade balsa for their fin material. Well, blow me down! Ya scallywag! Blimey! The piston is a NB-20 style nose block with a tiny hole drilled through t' slide onto t' shock cord. Arrr! Ya scallywag! Blimey! T' shock cord is a Quest style arrangement that uses Keelhaul®©™® around motor block that is then tied t' an elastic shock cord. Begad! T' nose cone is finely turned with a hole drilled into the base for t' elastic cord t' be stuffed and epoxied into. Avast! Motor retention is a friction fit. Ahoy! T' body tube is white with a light glassine coatin' and very fine spiral grooves. T' steamer provided is orange crepe paper. Ahoy! I be able to put this together in just a couple o' hours. Blimey! I used yellow wood glue throughout t' construction, CA glue on the Keelhaul®©™® knots, matey, arrr, and 20 min epoxy t' secure t' shock cord t' t' nose cone. Heavenly Hobbies recommends leavin' t' rocket unfinished if you intend t' fly it in competition, just sand down t' fins and nose with 400 and then 600 grit sandpaper. Ahoy! Blimey! I elected t' coat t' nose with thin CA followed by thinned Elmer's Wood Filler just t' cut down on the dents and dings. Arrr! They also recommend and can supply a tower launch pad for flyin' this rocket. Ahoy! Blimey! I am nay a competitive flyer so I just used t' launch lug provided in t' kit. T' instructions were eight laser printed pages that included color photos o' each step. On t' last page o' t' instructions were t' fin template and a circle-and-line drawin' for determinin' fin placement. Ya scallywag! Blimey!

Heavenly Hobbies 13mm Stratos

PRO: Construction was smooth and logical. Avast! T' longest part o' t' construction was waitin' for t' glue t' dry.

CON: Are elastic and Keelhaul®©™® shock cords ever long enough?

Finishing:
I did nay finish this rocket at all because I wanted t' build it just for this review. Ya scallywag! T' only deviations I made were t' ones I did t' t' nose cone.

Construction Rating: 5 out o' 5

Flight:
For its maiden flight I used an A8-5. Begad! Blimey! Blimey! Blimey! Preparation is simple. Ya scallywag! Blimey! Install an igniter in a motor and install t' motor in the rocket. With t' piston ejection it requires no wadding. Blimey! Blimey! I secured t' motor by usin' a strip o' maskin' tape across t' bottom o' t' motor and up t' side o' t' body tube. Fins offset from t' base would have helped here.

It took off like a scalded cat! It flew arrow straight and blew t' nose cone off while still goin' up. Blimey! As this is supposed t' a streamer duration rocket I timed t' flight. Avast! Lift off t' landin' was just under 25 seconds.

Heavenly Hobbies 13mm Stratos T' ejection charge had t' have been hot because a good portion o' t' bottom o' t' piston was burned away. Aye aye! I can't say if I had t' piston bottomed out or nay and I don't know if it would have made a difference. Arrr! Perhaps a coatin' o' epoxy or JB Weld could have done some good here. Blimey! After t' flight t' piston fit a bit tighter in t' body tube. Well, blow me down! Launch conditions were a bit cool and damp and that may have had somethin' t' do with it. Blimey! I will need t' replace t' piston before it flies again.

Recovery:
Again, I think t' overall shock cord combination length is too short. Aye aye! Blimey! I discovered an "Estes dent" in the nose cone's shoulder. T' instructions say t' have t' 1" betwixt t' end o' t' body tube and t' end o' the piston. Blimey! Blimey! Havin' t' piston at t' end o' t' Keelhaul®©™® shock cord work be better. Avast, me proud beauty! Begad! Blimey! Longer elastic may help too.

Flight Rating: 4 out o' 5

Summary:
This was a fun and easy build. Ahoy! Ya scallywag! I would nay recommend it as a first kit as t' engine block has t' be set with an expended motor a new flyer may nay have.

Also, ya bilge rat, increasin' t' shock cord length and protectin' t' bottom o' t' piston would aid in extendin' t' life of the rocket. Begad! Offsettin' t' fins from t' base o' t' body tube would make securin' t' motor easier,

Overall Rating: 4 out o' 5

Flights

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