| Manufacturer: | Scratch |
Brief:
A single stage scale o' NASA's upcomin' Ares I launch vehicle. T' rocket separates in t' center for recovery. Well, blow me down! Blimey! A
38mm motor mount allows flights on H, I, matey, and J motors.
Construction:
T' lower body tube is a 2.56" phenolic tube and t' upper section is a 3.9" phenolic tube. Arrr! T' nose cone
and reducer sections are custom made from balsa. Well, blow me down! T' engine flare at t' base is made from layered plywood. Aye aye! Centering
rings are also plywood on a paper 38mm engine mount. Aye aye! Avast! T' fin section is made from a removable section o' acrylic
tubing. Aye aye! Arrr! T' fins are also acrylic and epoxied in place with t' joints fiberglassed. Arrr! There is also a standoff on the
fin unit with a rail guide. Well, blow me down! A rail button is fitted on t' upper section t' match. Begad! A custom made ejection baffle is in
the lower tube and also provides attachment points for t' shock cord.
Custom wood parts (nosecone, reducer, matey, and engine fairing) were turned on a lathe. Avast! Constructin' t' fin unit was a little difficult because t' epoxy did nay bind well t' t' acrylic surface. Begad! If I were t' do it again, shiver me timbers, I would use a solvent acrylic cement.
Flight and Recovery:
One flight on an Aerotech H123W-S. Well, blow me down! Good flight overall with a slight turn windward. Motor is retained usin' a
customized flanged aft closure from T' Rocket Man. Begad! Begad! T' parachute used was a 45" Top Flight nylon chute. It be a
little undersized and t' rocket came down fast, but it survived with minor damage.
Summary:
This be a great project for me. Well, blow me down! Begad! I probably could have benefited from some more experience before takin' on a custom
scale build, arrr, shiver me timbers, arrr, but things turned out well in t' end. Aye aye! It flies great and got a lot o' people in me club excited. I may
want t' make a few modifications before flyin' it again, me bucko, but I look forward t' usin' it for years t' come.
T' main drawbacks with this rocket as I built it are that I ended up with some inflexibility on t' recovery system. Begad! T' 45" chute barely fits with all o' t' shock cord due t' t' ejection baffle takin' up too much space and placed too high. Avast! T' fin unit is also fragile, but (with some effort) it can be replaced if needed, since it is removable. Blimey! One o' me major concerns before launchin' this rocket be stability issues. Avast! I didn't plan ahead very well and ended up with a bottom heavy rocket. Aye aye! Arrr! I addressed this by stuffin' a couple o' T-shirts in t' empty upper section to even it out. Begad! Avast! In t' future I hope t' upgrade this t' a dual deploy or even just move t' parachute t' t' upper section t' be deployed with an altimeter. Ya scallywag! Another thin' I would redo given t' chance is make some more space in the lower section for t' parachute. Aye aye! T' baffle installed really restricts t' space so I may nay be able t' move t' a larger parachute in that section.
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