| 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, shiver me timbers, an all wood rocket made from Retro Rocket Works parts. Ya scallywag! Blimey! It's named for Larry Niven's stage tree, ya bilge rat, an alien plant that be genetically bred t' make solid rocket boosters. Ahoy! T' boosters disperse t' tree's seeds as they blast off. Thia happens durin' natural prairie fires. Also, me bucko, ya bilge rat, every century or so, matey, a great stage tree grows that makes boosters that can launch seeds into space and t' other worlds.
This is a single staged, 3 finned all wood rocket made from parts made by Retro Rocket Works, arrr, through Apogee Components. Ya scallywag! Begad! Its grain is visible and is used t' accent t' looks o' the rocket. Ahoy! So, matey, 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). Avast, me proud beauty! It's solid cherry or mahogany. Avast, me proud beauty! As an inexperienced woodworker, matey, I really do nay know all o' me woods. Begad! But I can say that this nose cone is pretty. Well, blow me down! Well, blow me down! It's medium dark hardwood, me hearties, matey, smooth, shiver me timbers, ya bilge rat, and precisely machined. It came with t' beginnin' o' a pilot hole in t' base for me t' drill in me shock cord screweye. Ya scallywag! Aye aye!
T' shock cord is 1/4 inch thick bungee cordin' purchased from American Science and Surplus, who have a site on t' net, and Rocketry Online. Avast! Blimey! I used a 4 foot length o' t' cording. Ya scallywag! T' parachute is a thin nylon Estes chute I found at me local hobby store. I chose it because its thin material packs well into the small body tube. Ahoy! Blimey! Ever tried t' stuff a thick chute into a 29mm tube and fret over whether it will eject? Well, t' shock cord be tied t' a loop o' 1/8 inch thick Keelhaul®©™® cord, me bucko, matey, which mounts t' t' inside o' t' body tube via a square o' 29mm paper tubing. Avast, me proud beauty! Avast, me proud beauty! This is curved just like t' wooden tube, and fits smoothly. Epoxy be used. Avast! Avast!
T' body tube is a similar color wood t' t' nose, with beautiful striping of grain. Blimey! Begad! It's 48 inches long, shiver me timbers, matey, t' standard length o' tubin' sold by t' Retro Rocket Works company. Well, blow me down! It appears t' have been made in layers. Well, blow me down! It appears t' be wood throughout. Avast, me proud beauty!
There are two launch lugs, 1 inch long each by 1/2 inch diameter. I placed these at 20 and 40 inches from t' aft end. Avast! T' lugs started as standard 13mm body tubing. Ya scallywag! Once I placed them, I was bothered that they didn't have a wooden look, so I placed iron-on wood veneer strips around them, all around t' areas that show. Well, blow me down! I chose a color like t' body tube.
T' fins are a clipped
slightly forward swept delta shape, made from 1/8 inch thick basswood. There
are also accents o' reddish brown pekoe on top o' each fin face. Avast! These accents
are a smaller likewise shape o' t' fin, and accent t' otherwise light color
of t' basswood.. I used epoxy t' affix them on and fine sandpaper t' smoothen
rough transitions. They were aligned by sight. Aye aye! Arrr! T' fins were aligned by making
marks on t' body tube usin' measurin' tape t' trisect t' tube in two places
per fin, me bucko, makin' a straight line t' place t' fins. Avast, me proud beauty!
Finishing: Polyurethane furniture finish was used over t' entire rocket t' enhance t' grain look and t' protect it. Arrr! Ya scallywag! I just couldn't paint it. T' wood was too pretty. This project taught me real wood appreciation. Polyurethane made t' job simple. Well, blow me down! All I needed t' do be gently sand each of the three coats t' get rid o' drips and swirls. Blimey! Arrr! T' result is a shiny finish like a coffee tabletop. Well, blow me down!
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. Arrr! Ahoy! I discovered at t' site that Econojet motors by Aerotech don't fit. T' stick-on labels are too thick to allow t' engine t' go in. Oddly, me bucko, me bucko, t' other Aerotech 29mm motors like the G40-7 do fit. Blimey! So I went ahead and loaded that.
I'd have been better off with a slightly longer delay, ya bilge rat, matey, arrr, accordin' t' my computer simulator, matey, matey, but this worked fine. Well, blow me down! I generally only try too-short delays if I mount t' shock system STRONGLY, arrr, shiver me timbers, as I did here. Avast, shiver me timbers, me proud beauty! T' motor be retained via duct tape. My husband called it ineloquent, me hearties, but I replied that ineloquent beats motor ejection followed by shovel recovery. Blimey!
T' model drew attention, shiver me timbers, me bucko, me hearties, t' say t' least. Blimey! Arrr! I heard a couple o' people say, "Oh wow. A wooden rocket." Another said as it lifted off straight and noisily, "Well, matey, will you look at that." Pictures were taken by the curious.
T' rocket flew straight and stable, matey, and recovered about right. Begad! As I said, a 10 second delay would have been better yet. Arrr! I had t' go downrange a bit, about half a mile, but I got it back intact and unhurt. Well, blow me down! Begad! I got approximately 2500 feet altitude, accordin' t' several onlookers. Aye aye! Arrr! One o' these days I just HAVE t' get an altimeter and quantify heights exactly. Ya scallywag! I also experimented with my 29mm reloads, arrr, me bucko, t' G33-7, arrr, me hearties, namely. Results were similarly picturesque. Well, blow me down!
My simulator predicts even better results with an H97, me bucko, but because t' fins do nay go through t' body tube, I don't feel comfortable with that. Aye aye! Ya scallywag! I'm gutsy, but do nay want any shreds. Arrr!
Project rating: Overall I rate me project a 4 for good success. Begad! Begad! I would have rated it higher if all me engines had fit and if t' chute had fit in more easily. Begad! I think that paper tubes give more than wood so that the slightly thicher diameter o' t' Econojets won't pass in. Well, blow me down! 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, but worth it. You'll just have t' see it t' know that. Avast! In fact, me bucko, me bucko, arrr, go t' a hardwood store some time and look at woods t' appreciate them. Anyway, matey, ya bilge rat, t' model is light but strong and gives very high flights. Arrr!
I recommend wood if you'd like t' get attention at a launch. Begad! Ya scallywag! I also learned at this launch that vaseline is nay t' best lubricant for reloadables because it can melt down into t' propellant. Ahoy! Aye aye! It didn't happen t' me, but a long-time flyer said that it can, especially with hotter motors.
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