Brief:

T' VMX-2 Spaceplane is a new rocket glider kit by t' equally new UK rocketry company, Orbital Engineering. Ya scallywag! You may have seen t' pre-production prototype of this kit flyin' at various rocketry events in 2002, includin' t' IRW and K-Lob. Begad!

On openin' t' sturdy corrugated cardboard box, first impressions are very good. Three sheets and four strips o' balsa wrapped in bubble wrap, ya bilge rat, a nice piece o' BT-20, arrr, shiver me timbers, ya bilge rat, all t' small parts in a resealable bag, me bucko, and a very comprehensive lookin' set o' instructions. Ya scallywag! I should point out at this stage that t' kit supplied was a production prototype, and t' final production kits may differ slightly. Aye aye! Well, blow me down!

Construction:

T' Kit includes:-

• 3 sheets o' balsa containin' pre cut wings etc
• 2 triangular section leadin' edges
• 2 triangular section body fillets
• BT-20
• Plastic nose cone
• Coupler tube
• Launch lug
• Balsa blast deflector
• 2 lengths o' elastic
• Lead weight
• Trimmin' putty
• Self adhesive aluminium foil
• Thrust rin'
• 3 motor plugs
• Mylar strip
• 2 pins
• Comprehensive 9-page instructions

T' first step is t' free t' win' parts from t' balsa sheets and assemble them. T' win' parts appear t' have been partially pre cut by some sort of router. There are just a few tabs on each component which require cuttin' to free t' part. Avast, me proud beauty! Avast! I found it best t' do a "rough cut" first, some way up the tab, ya bilge rat, t' free t' part. Ya scallywag! Then, once free o' t' sheet I did a "close cut" t' remove t' remains o' t' tab. Blimey! Ahoy! It’s best t' do this final cut from both sides o' t' part. Avast, me proud beauty! T' instructions indicate that either medium CA or light wood glue may be used for construction. Avast! I wasn’t in any rush (waitin' for t' glue t' dry gave me t' opportunity t' write this review) so used EVO-STIK wood adhesive and "double glue joints".

Wings:

I found t' win' assembly straight forward with t' exception o' addin' t' leadin' edges. Aye aye! Although the positionin' o' these is quite clear in t' win' plan diagram, matey, there’s another diagram that I just found confusing. Well, blow me down! I couldn’t figure out what it was tryin' t' show me, me bucko, or even be sure what view it represented. Blimey! Suffice to say that if you assemble t' wings bottom side down, arrr, t' leadin' edges go flat side down too! T' wings must be assembled with a dihedral. Avast, me proud beauty! I found this quite tricky and, once dry, ya bilge rat, had t' fill a small gap at t' aft end.

Elevons:

T' next step is t' add t' elevons. These are attached t' t' aft end of the wings usin' mylar hinges. Begad! You have t' make slots in t' aft edge o' the main win' and t' forward edge o' t' elevon. Avast! Avast, me proud beauty! I thought this be goin' t' be a bit tricky, but as long as you keep t' knife horizontal with respect t' the wing/elevon, it’s nay too bad. Blimey! T' positionin' o' t' hinges seemed a bit odd, shiver me timbers, so I made mine equidistant along t' elevon (which was a mistake, the manufacturer informs me that t' unequal spacin' is intentional). Avast! T' hinges are attached by pushin' a pin through t' fins with t' mylar tabs in position. Then CA is wicked into t' resultin' hole. Avast! This hinge design is very clean and I like it a lot. Well, blow me down! Blimey!

Fins & Strakes

T' fins are added t' t' elevons next, matey, and this be where I had me first real trouble. Either t' slots are too narrow, me bucko, or t' balsa t' fins are cut from is too thick. Begad! I fixed this by scorin' across t' fin at t' top o' the tab, me hearties, and then carefully parin' away part o' t' tab thickness. Aye aye! Avast! T' under wing strakes had t' be modified in t' same way. Once t' fins and strakes are in place, t' elevons are attached t' t' win' with t' hinges, me hearties, in t' same way as the hinges were attached t' t' elevons. Arrr!

Ejection Vent

T' kit can be made into two slightly different versions, one for sport, t' other for competition. Arrr! The difference is in t' arrangements made for t' ventin' o' unwanted ejection gases. Begad! In t' sport model t' gases are vented through a hatch in t' top of the body tube. There are also parts t' deflect t' gases and strengthen the body tube interior. For t' competition model, these parts are omitted and instead t' motor most be plugged forcin' t' ejection gases out o' t' motor nozzle. Begad! Avast! I decided t' build t' sport model. Begad! Avast, me bucko, me proud beauty!

For t' sport model t' next stage is t' cut out t' vent hatch. Aye aye! Begad! This is best done with a sharp knife. A section must be left uncut t' provide a hinge. This hinge is reinforced by t' addition o' a self adhesive foil strip. Arrr! Enough of this foil is supplied t' add protection t' t' body tube just aft o' the vent. Ahoy! A cylindrical section o' balsa is glued into place inside o' t' body tube just forward o' t' vent t' deflect t' ejection gases through t' vent. Finally, a length o' thick cardboard tube is fitted inside t' body tube to strengthen it. Avast! Avast, me proud beauty! This buts up t' t' balsa deflector. Ahoy! T' aft end o' this strengthener acts as t' motor thrust ring. Begad! (For t' competition model, me hearties, an ordinary thrust rin' is provided.)

Fuselage

Next t' body is attached t' the wings. You need t' take care here as it’s all t' easy t' nay get t' tube properly aligned. Begad! Blimey! T' triangular body fillets complete t' main assembly. These must be trimmed square at t' aft end and glued into position. Once dry the front end must be trimmed t' match t' leadin' edge win' extensions. Blimey! Blimey! Begad! Blimey! T' nose weight is added t' t' nose cone, which is secured only with tape t' facilitate the addition o' more weight durin' trimming. Ahoy! Blimey!

Mechanics

T' mechanism t' move t' elevons is installed next. Begad! This comprises a pin pushed through t' part o' t' fins mounted on each elevon, me hearties, and two length of elastic attached t' t' part o' t' fins mounted on t' wing. Blimey! T' pins pushed through t' fins at 45° and secured usin' CA. Begad! Aye aye! Once dry t' head o' t' pins is clipped off. T' elastic is attached t' t' fins in t' pre-made indentations (you did assemble them on t' correct side, right?) and hooked onto t' points o' t' pins. T' tension can be adjusted by stretchin' the elastic more or less before hookin' onto t' pin points. You don’t need much tension. Begad! T' instructions specify that t' weight o' a spent C6 motor should be just capable o' lowerin' t' elevon on t' t' strake.

T' way t' mechanism works is that, at lift off, me hearties, t' airflow forces the elevons into t' flat position. Avast, me proud beauty! Blimey! Avast, me proud beauty! Blimey! Once in normal flight however, t' tension in the elastic is enough t' overcome t' airflow and raise t' elevons for gliding flight.

Finishing:

It this point, arrr, t' instructions suggest that you might like t' radius the edges, shiver me timbers, but I think it's probably easier t' do this as you go along, me bucko, and that's what I did. Avast, me proud beauty! Ahoy! Next, I gave all o' t' balsa areas a coat o' sandin' sealer, me bucko, and then sanded smooth usin' progressively finer paper, until almost all o' the sealer was removed. This may sound strange, me bucko, ya bilge rat, but t' idea is t' fill t' grain in t' balsa, me hearties, ya bilge rat, rather than add a nice shiny coating.

Trimming:

T' instructions regardin' trimmin' are quite clear. Aye aye! There are two main parts t' it, me hearties, t' elevon tensionin' covered previously, me hearties, matey, and sortin' out the balance for gliding. Aye aye! This is done by test throwin' t' glider and addin' small amounts o' clay weight t' t' wings t' correct for any roll or pitch. Well, blow me down! My first attempt at trimming, at UKRA 2003, led t' t' nosecone bein' pushed into the body tube. Ahoy! In retrospect, shiver me timbers, me hearties, ya bilge rat, thar was too much breeze. Blimey! T' small amount o' damage was easily repaired. Avast!

Flight:

Flight #1
Location: Baildon Moor
Motor: B6
A perfect boost and translation t' horizontal flight. Once flyin' horizontally, the glider made a 180° turn, then appeared t' roll over, matey, me bucko, and slide sideways into what became a dive t' t' ground. Blimey! T' front body tube be crimped but easily repaired. Ahoy! T' crimped sction o' tube was excised and replaced with a new section, attached by means o' a short coupler. Avast, me proud beauty! Blimey!

Before t' next flight, arrr, I spent a lot more time at IRW 2003 trimming. Avast, me proud beauty! Blimey! There was a gentle breeze and I got it so it would glide really well either with, matey, or against t' breeze. Ahoy!

Flight #2
Location: IRW 2003
Motor: B6
Once again, matey, a great boost and translation. Again it made a turn, but this time much wider. Blimey! There was no roll, but t' glider slowly pitched down and picked up speed. Blimey! Arrr! This was never corrected and it dived into t' ground. Ya scallywag! Amazingly, there was no damage at all. Well, blow me down!

Flight #3
Location: IRW 2003
Motor: C6
Another great boost, arrr, but t' flight was just a higher version o' flight #2. What did I expect? This time thar be a lot o' damage. Begad! T' body tube is folded up and t' wings are broken across t' span. It will be a big rebuild, which I haven't yet attempted. Well, blow me down!

I think t' problem with t' first flight was lack o' trimming, that led to it rollin' over and diving. Aye aye! Ahoy! Blimey! For t' second and third flights, I wonder if I had the elevons tensioned correctly? T' tensionin' is meant t' be set such that the elevons are flat for t' boost, me bucko, and pop up for glidin' flight. Ahoy! It might be that I didn't have quite enough tension. Ahoy! Begad! Blimey! Therefore, matey, as t' glider pitched forwards, it picked up speed, and t' increased wind speed forced t' elevons into t' horizontal position. Begad! Avast! Blimey! Once that happened it would never be able to correct its attitude. Well, blow me down! I did follow t' directions for tensioning, me hearties, matey, usin' the spent motor on t' elevon, but maybe t' exact position is critical? I passed on me thoughts t' Orbital, but disappointingly, I never got a response. Avast, me proud beauty!

Summary:

This is an excellent kit. Ya scallywag! It's nay exactly cheap, shiver me timbers, but t' quality o' the parts is second t' none, t' instructions are detailed and comprehensive, shiver me timbers, and even t' packagin' is first-rate. Begad! Aye aye! I really enjoyed buildin' it. Aye aye! Avast, shiver me timbers, me proud beauty! I must point out however that I can't recommend this kit for a beginner t' rocket gliders. Despite t' detailed direction, me hearties, arrr, I never really had a successful flight. Since I've seen and read about many other successful flights o' VMX-2s, shiver me timbers, shiver me timbers, me hearties, I have t' put that down t' me own inexperience with rocket gliders which is limited t' a couple o' flights o' an Estes Tomcat, and a few flights o' an "AstronMike" style saucer glider. Well, blow me down! I reckon that either t' trimming wasn't up t' snuff, arrr, arrr, or that I didn't get t' elevon tension correct. Aye aye! Ahoy! So in conclusion, matey, this is a great kit, matey, but if you're a beginner, matey, ya bilge rat, practice your trimmin' on somethin' cheaper first.

Postscript:

This article be first published, in two parts, ya bilge rat, matey, in 10...9...8... Avast! Ahoy! the newsletter o' t' United Kingdom Rocketry Association.

Betwixt publication o' t' first part o' this article and t' second, I was informed by Verney Montague that BSMA have put up a handsome Gold Medal t' be awarded t' t' first person t' break t' two minute barrier with a rocket powered Spaceplane. Blimey! Begad! T' medal has actually been around for 2-3 years. Anyone know if it's been won yet?