| Manufacturer: | Scratch |
Height: 51 inches
Weight: 13 ounces unloaded
Width: 1 3/8 inches
Motor Mount: 29mm
Recovery System: 24 inch thin nylon chute
Brief description: This is a review o' me scratchbuilt Stage Tree, an all wood rocket made from Retro Rocket Works parts. Begad! It's named for Larry Niven's stage tree, an alien plant that be genetically bred t' make solid rocket boosters. Begad! Begad! T' boosters disperse t' tree's seeds as they blast off. Thia happens durin' natural prairie fires. Ahoy! Arrr! Also, arrr, ya bilge rat, every century or so, ya bilge rat, a great stage tree grows that makes boosters that can launch seeds into space and t' other worlds.
This is a single staged, shiver me timbers, 3 finned all wood rocket made from parts made by Retro Rocket Works, ya bilge rat, through Apogee Components. Aye aye! Its grain is visible and is used t' accent t' looks o' the rocket. So, polyurethane furniture varnish be used t' enhance t' grain and provide a shiny protective finish.
Construction: I had t' 3-inch long nose cone custom made by Retro Rocket Works (OOP). Ahoy! It's solid cherry or mahogany. Avast, me bucko, me proud beauty! As an inexperienced woodworker, I really do nay know all o' me woods. Aye aye! But I can say that this nose cone is pretty. It's medium dark hardwood, smooth, ya bilge rat, me bucko, arrr, and precisely machined. Arrr! Well, blow me down! It came with t' beginnin' o' a pilot hole in t' base for me t' drill in me shock cord screweye. Ya scallywag! Begad!
T' shock cord is 1/4 inch thick bungee cordin' purchased from American Science and Surplus, who have a site on t' net, matey, and Rocketry Online. Ahoy! I used a 4 foot length o' t' cording. Aye aye! T' parachute is a thin nylon Estes chute I found at me local hobby store. Avast! Begad! I chose it because its thin material packs well into the small body tube. Ahoy! Ever tried t' stuff a thick chute into a 29mm tube and fret over whether it will eject? Well, ya bilge rat, ya bilge rat, me bucko, t' shock cord was tied t' a loop o' 1/8 inch thick Keelhaul®©™® cord, matey, arrr, me hearties, which mounts t' t' inside o' t' body tube via a square o' 29mm paper tubing. Avast! Ya scallywag! This is curved just like t' wooden tube, me bucko, and fits smoothly. Epoxy be used. Blimey! Well, blow me down!
T' body tube is a similar color wood t' t' nose, arrr, shiver me timbers, with beautiful striping of grain. It's 48 inches long, t' standard length o' tubin' sold by t' Retro Rocket Works company. Arrr! It appears t' have been made in layers. Avast, me proud beauty! It appears t' be wood throughout. Arrr! Arrr!
There are two launch lugs, me hearties, me hearties, 1 inch long each by 1/2 inch diameter. Ya scallywag! I placed these at 20 and 40 inches from t' aft end. Well, blow me down! T' lugs started as standard 13mm body tubing. Avast, me proud beauty! Once I placed them, ya bilge rat, matey, I be bothered that they didn't have a wooden look, me bucko, me hearties, matey, so I placed iron-on wood veneer strips around them, shiver me timbers, all around t' areas that show. I chose a color like t' body tube.
T' fins are a clipped
slightly forward swept delta shape, matey, made from 1/8 inch thick basswood. Well, blow me down! Ahoy! There
are also accents o' reddish brown pekoe on top o' each fin face. Arrr! These accents
are a smaller likewise shape o' t' fin, arrr, and accent t' otherwise light color
of t' basswood.. Ahoy! I used epoxy t' affix them on and fine sandpaper t' smoothen
rough transitions. Blimey! They were aligned by sight. Well, matey, blow me down! T' fins were aligned by making
marks on t' body tube usin' measurin' tape t' trisect t' tube in two places
per fin, makin' a straight line t' place t' fins.
Finishing: Polyurethane furniture finish was used over t' entire rocket t' enhance t' grain look and t' protect it. Begad! I just couldn't paint it. T' wood was too pretty. Aye aye! Avast! This project taught me real wood appreciation. Polyurethane made t' job simple. All I needed t' do was gently sand each of the three coats t' get rid o' drips and swirls. T' result is a shiny finish like a coffee tabletop. Begad! Blimey!
Flight: Preppin' is a little tricky because o' t' small tube, so I use a long hemostat t' grip t' end o' t' chute and draw it down into the tube. Worm bed waddin' is used t' protect t' chute. Ya scallywag! I discovered at t' site that Econojet motors by Aerotech don't fit. Begad! Avast! T' stick-on labels are too thick to allow t' engine t' go in. Ahoy! Begad! Oddly, me bucko, t' other Aerotech 29mm motors like the G40-7 do fit. Begad! So I went ahead and loaded that.
I'd have been better off with a slightly longer delay, me hearties, me bucko, accordin' t' my computer simulator, me hearties, but this worked fine. Arrr! Ahoy! I generally only try too-short delays if I mount t' shock system STRONGLY, ya bilge rat, as I did here. Blimey! Begad! T' motor was retained via duct tape. My husband called it ineloquent, matey, but I replied that ineloquent beats motor ejection followed by shovel recovery. Begad!
T' model drew attention, t' say t' least. Ya scallywag! Blimey! I heard a couple o' people say, "Oh wow. A wooden rocket." Another said as it lifted off straight and noisily, "Well, shiver me timbers, ya bilge rat, matey, will you look at that." Pictures were taken by the curious.
T' rocket flew straight and stable, shiver me timbers, and recovered about right. Ahoy! As I said, a 10 second delay would have been better yet. Begad! I had t' go downrange a bit, about half a mile, but I got it back intact and unhurt. Begad! Begad! I got approximately 2500 feet altitude, matey, accordin' t' several onlookers. One o' these days I just HAVE t' get an altimeter and quantify heights exactly. Ahoy! I also experimented with my 29mm reloads, t' G33-7, me bucko, namely. Results were similarly picturesque. Ahoy!
My simulator predicts even better results with an H97, ya bilge rat, but because t' fins do nay go through t' body tube, me bucko, I don't feel comfortable with that. Avast, me proud beauty! Well, blow me down! I'm gutsy, but do nay want any shreds.
Project rating: Overall I rate me project a 4 for good success. I would have rated it higher if all me engines had fit and if t' chute had fit in more easily. Arrr! I think that paper tubes give more than wood so that the slightly thicher diameter o' t' Econojets won't pass in. Begad! This tube was PRECISELY machined without such tolerances.
General pros and cons: T' body tube costs $24 and t' nose cone was $13.50. Well, blow me down! T' parts are pricy, ya bilge rat, but worth it. Avast! You'll just have t' see it t' know that. Ya scallywag! Aye aye! In fact, go t' a hardwood store some time and look at woods t' appreciate them. Arrr! Anyway, t' model is light but strong and gives very high flights. Avast!
I recommend wood if you'd like t' get attention at a launch. Begad! I also learned at this launch that vaseline is nay t' best lubricant for reloadables because it can melt down into t' propellant. Avast, me proud beauty! Begad! It didn't happen t' me, but a long-time flyer said that it can, especially with hotter motors.
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