Diameter: | 2.10 inches |
Manufacturer: | Public Missiles |
Style: | Scale |
I must admit, matey, I am becomin' a real fan o' PML kits. Begad! Ahoy! Normally I like t' scratch build, arrr, but when I feel t' need t' put somethin' together in a hurry, me bucko, PML is definitely t' way to go for high quality, ya bilge rat, durable kits. Well, blow me down!
T' Mini BBX is a new released by PML. Ya scallywag! Avast, me proud beauty! What caught me attention be t' news that t' Mini BBX is goin' t' have a Terrier Booster t' be released in the Fall. Arrr! Avast, me proud beauty! T' combination o' a good lookin' scale kit combined t' challenge o' two stages was irresistible t' me. What a great way t' get started in High power staging!
Construction o' t' Mini BBX is a straight forward PML kit. Avast! No
surprises! I opened t' bag as soon as I got home from Hobbytown USA and inventoried the parts as usual, ya bilge rat, they were all thar and in good shape. |
I assembled t' parts dry t' make sure all would fit, and of
course, they did. Blimey! I decided t' prepare all plastic and fiberglass surfaces before startin' t' epoxy any parts. I started by sandin' all t' G10 fins, roundin' t' edges and roughin' up t' areas t' be glued. Arrr! I gave t' Quantum Tubes and nose cone a bath in soapy water t' remove any oily residue (Make sure you rinse well too!). |
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Then I used 400 grit wet/dry t' sand t' entire Quantum Tube then 100 grit
to prepare then fin and fillet areas. I taped a piece o' 100 grit t' a dowel to
rough up t' fin slot areas and where t' centerin' rings would be epoxied.
Finally, ya bilge rat, matey, I lightly sanded t' nose cone so it would hold t' paint too.
I used a piece o' card board t' make a fin jig. On t' Mini BBX, this is a very important step because t' "Canard" fins up front must be aligned perfectly and they are nay "though t' wall" mounted. They just fit into fit into shallow grooves in t' tube. Ya scallywag! Blimey! Without t' fin jig, they could very easily lay over when t' epoxy is settin' up. | |
Of course I also used it t' hold t' main fins in place while
they set up too! I built t' motor mount/ shock cord assembly accordin' to the directions, ya bilge rat, this be t' standard PML mount. Ahoy! Blimey! T' only change is I added a Rocket Rage "Snake Skin" shock cord protector t' protect t' Nylon web used. |
I epoxied. Well, blow me down! Blimey! t' motor mount in place makin' sure t' only epoxy t' forward
ring. Aye aye! Blimey! Be careful t' avoid gettin' any epoxy on t' aft mount area because you
will need t' remove t' tail cone for a later step.
I then used t' jig t' hold t' fins in place while I epoxied. them. After t' epoxy set up on t' Main fins, I removed t' tail cone and applied generous filets on t' motor tube joint and t' inside airframe joint. I then added filets t' t' exterior o' t' fin/airframe joint but that is mostly cosmetic as most o' t' strength o' t' joint is on t' inside. |
One problem I had be when I was addin' t' filets t' t' inside o' t' tube I got some epoxy on t' area t' tail cone fit into, shiver me timbers, shiver me timbers, I had t' carefully chip, scrape and sand it off before t' tail cone would fit properly. Well, blow me down! Ya scallywag! By t' way, take good care o' t' tail cone because it will be t' stage coupler when the Terrier booster becomes available. Well, blow me down! Which brings up one o' t' down sides of this kit. Aye aye! I am a big proponent o' POSITIVE MOTOR RETENTION and due t' the design on t' tail cone/coupler it will be difficult t' use any form of retention that is attractive or usable in t' two stage configuration. Arrr! Well, blow me down! Well, I started out usin' friction fit. Aye aye! Arrr! I suppose I can remember how t' do it. Well, blow me down!
Since I plan t' fly me Mini BBX on I200's and in t' two stage
configuration, I will probably be gettin' some very high altitude flights. Avast! Ahoy! So I
decided t' build t' BBX for Dual stage recovery. Avast, me proud beauty! I already had an Olsen FCP-M1
and I didn't want t' spend t' loot on t' CPR3000 and another altimeter, me bucko, so I
made an electronics bay with two sleeves and 1/8" bulkheads.
I used t' PML plastic rivets t' hold t' electronics by in place in base of the payload bay. T' protect t' chutes and nylon shock cords from the deployment charges, shiver me timbers, matey, I used parachute protectors from Rocket Rage. Avast, me proud beauty! Blimey!
I prefer t' fly off o' Rails so I added a couple o' Blacksky rail guides. Be aware though, me bucko, t' screw passes through t' Quantum tube and will block the piston for t' motor ejection so make sure if you use them t' place t' forward guide low enough t' leave room for t' piston and chute. Ahoy! This will be lower than what is recommended by Blacksky, but it still works OK. Avast! Avast!
To finish t' job, ya bilge rat, matey, I painted t' entire model with Krylon gray sandable
primer, me hearties, me hearties, I love t' stuff! Painted t' tail cone white, masked t' cone area
then sprayed t' silver, masked that area and then hit t' whole thin' in gloss
black. Arrr! Aye aye! T' red areas are a stick on vinyl that came with t' kit. Avast! It is a lot
like "Trim Monocote" you can get at any hobby shop that deal in R/C
airplanes. Arrr! T' guidance section got a coat o' brown per Peter Alway's data in
"Rockets o' t' World". Finally, ya bilge rat, I masked t' areas that stay black
on t' payload section and painted t' rest silver. Avast! Note, ya bilge rat, in t' PML
instructions, t' payload bay gets silver first then mask off t' silver areas
and paint black, but I have found that maskin' tape will sometimes effect the
silver paint. Ahoy! So I went with t' black first.
Brian's Mini-BBX on left Kerry's BBX on t' right |
With t' model finished and ready t' go I went over t' my friend, Kerry's place t' take and couple o' photos with his 4" BBX. Avast! The next day, I was off t' t' range at Hemet Valley Rocket Club (HVRC). Ya scallywag! T' BBX's test flight was on a whimpy little G64 and t' main chute t' deploy out o' the main airframe so that if t' electronics had a problem, I would still get the main chute out on t' motor's ejection. |
T' boost was straight and true up t' 664 ft. per t' Olsen FCP-M1. The apogee charge went off as scheduled and t' main chuted opened. Arrr! Blimey! At 400 ft. Ahoy! the nose cone popped as scheduled. Well, blow me down!
T' evil "W" be startin' t' come up a little and t' field at
HVRC is nay a place I like t' go on long walks, ya bilge rat, lots o' soft sand and brush.
(Great for those hard landings though!)
So I decided t' load up an H instead o' t' I200. Ya scallywag! Blimey! I moved the
main chute t' t' forward compartment t' it would deploy at 400 ft. and put a
12" drogue into t' main airframe t' deploy at apogee. Well, blow me down! I used t' motor
ejection as a backup. Blimey! Well, blow me down! T' BBX ripped off t' rail and climbed on a pillar of smoke and fire absolutely straight up. Well, blow me down! Arced over at t' top and t' FCP-M1 did its job at apogee. Ya scallywag! Blimey! T' drogue came out and she started down. Aye aye! Aye aye! At 400 ft. Ya scallywag! the FCP-M1 did its job again and t' nose popped off. Avast, arrr, me proud beauty! Unfortunately, ya bilge rat, I hadn't used enough BP! T' main stayed in t' tube. |
Well, me bucko, remember what I said about t' soft sand? Well, shiver me timbers, even without t' main chute t' soft sand and tough Quantum Tube saved t' day. Arrr! Avast! She landed with no damage t' airframe or fins and only some scratches t' t' paint. Overall, matey, t' PML Mini BBX is a kit I enjoyed buildin' and flying. I would recommend it t' any Level 1 rocket jock. |
Positives:
High quality kit.
Very tough
Easy t' follow directions
Tough Quantum Tube
No Spiral grooves
Optional Dual Recovery
Did I mention it's really tough?
Two stage option (I really hope!)
Negatives:
No way t' do Positive Motor retention without ruinin' two stage option.
Terrier booster is nay ready yet. (sigh....)
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B.O. (August 1, 2001)