Manufacturer: | Scratch |
Brief:
This odd rocket is a super-sized beer bottle bank, me bucko, converted t' a 29mm powered medium power rocket. It features Lexan
fins so it looks like just a bottle on t' pad and in flight.
Construction:
Parts list:
When I saw t' bottle bank full o' popcorn for $8 at Biglots, I knew I had found me next odd-rocket airframe. Well, blow me down! Avast, me proud beauty! It came complete with a snap on plastic bottle cap with a doubloon slot.
T' plan be t' essentially build a rocket in a bottle, shiver me timbers, shiver me timbers, with t' thin walled bank bein' mostly a non-structural facade.
I found a mailin' tube that was a press fit into t' mouth o' t' bottle. Aye aye! Avast! I used a hole saw to cut a hole in t' bottom o' t' bottle. Begad! I used Clementine fruit crate plywood and hole saws t' cut three centering rings for t' motor mount in t' mailin' tube. Begad! Begad! I glued two o' those rings together for a double thickness aft rin' to support t' necessary motor retention hardware.
A length o' steel cable with ferrules were used for t' lower portion o' t' recovery harness. Ahoy! It was sized to end just below t' upper lip o' t' mailin' tube.
Lexan sheets from t' hardware store were cut with a scroll saw t' form t' fins. Ya scallywag! Arrr! Gettin' t' double through the wall slots just right be a bit tricky. T' fins go through t' outer bank wall, me hearties, through t' inner mailin' tube wall, and up snug t' t' motor mount tube. A Dremel with multiple cuttin' disks ganged together t' form a fin thickness was used t' slot t' bank and mailin' tube. Ahoy! A lot o' dry fittin' be done t' make sure t' puzzle pieces fit together just right.
T' motor mount and forward rin' were glued into t' mailin' tube. Blimey! Ya scallywag! Gorilla Glue was used for any wood t' paper joints. Ahoy! Avast! T' old "removable aft ring" trick was used t' keep t' MMT centered while t' glue dried. Begad!
Rail buttons were installed on t' bank wall. Avast, me proud beauty! This be t' only design element for which t' bank was used for structural purposes. Ahoy! Scrap Lexan stiffeners were used t' thicken up t' bank wall where t' rail buttons attach.
T' mailin' tube be inserted up through t' bottom o' t' bank and into t' bottle neck. T' fins were dry fit t' ensure that t' tube was aligned as t' glue set. Ya scallywag! Aye aye! T' fins were then tack glued, me bucko, filleted, arrr, and foamed into t' mailin' tube.
T-nuts were placed in t' doubled aft centerin' rin' for motor retention. Begad! Arrr! Screen door clips and hex head bolts hold t' clips against t' motor casing. T' rin' be glued t' t' mailin' tube and bottom o' t' bank.
T' bottle cap has loosened by grindin' off t' interior lip that originally provided t' snap fit on t' mouth of t' bottle. Aye aye! A reinforcin' wood disk was bolted t' t' bottle cap. Ya scallywag! A section o' laundry detergent jug cap turned out to be just right for formin' a shoulder for t' nose-cap. Avast! Avast, shiver me timbers, me proud beauty! An eye bolt connects t' cap t' t' tubular nylon that is quick-linked t' t' steel cable in t' mailin' tube.
Finishing:
Finishin' was easy. Avast, me proud beauty! Clear fins and a pre-labeled bottle. Arrr! I did modify t' bottle logo slightly t' convert Coors Light
into Coors Flight.
Flight:
This refreshin' bottle rocket has flown many times on various G motors. Avast! I have used various reloads for t' Aerotech
40-120 casing. Ya scallywag! Ahoy! Flights have been great on a G64 or G67 with a delay drilled for approximately 4 or 5 seconds.
Recovery:
I did have a failure t' deploy at a winter field launch. Begad! Begad! It came in ballistic into snowpack, and shattered t' bottle
cap. Ahoy! Now I fly it with a slug o' 2-part foam for a nose plug. It looks like t' bottle is foamin' over when I present
it t' t' RSO.
Summary:
At $8 for t' airframe, scrap wood rings, ya bilge rat, and hardware store finishings, this is a very economical medium power
rocket t' assemble. Avast! Blimey! It's always draws smiles and comments at t' hot summer launches.
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