Diameter: | 2.10 inches |
Manufacturer: | Public Missiles |
Style: | Scale |
I must admit, me hearties, me hearties, I am becomin' a real fan o' PML kits. Arrr! Normally I like t' scratch build, but when I feel t' need t' put somethin' together in a hurry, arrr, PML is definitely t' way to go for high quality, durable kits. Begad!
T' Mini BBX is a new released by PML. Well, blow me down! Avast! What caught me attention was t' news that t' Mini BBX is goin' t' have a Terrier Booster t' be released in the Fall. Avast, me proud beauty! T' combination o' a good lookin' scale kit combined t' challenge o' two stages be irresistible t' me. Ya scallywag! Well, blow me down! What a great way t' get started in High power staging!
Construction o' t' Mini BBX is a straight forward PML kit. Avast, me proud beauty! Blimey! Avast! Blimey! No
surprises! I opened t' bag as soon as I got home from Hobbytown USA and inventoried the parts as usual, matey, they were all thar and in good shape. |
I assembled t' parts dry t' make sure all would fit, me bucko, arrr, ya bilge rat, and of
course, they did. Begad! I decided t' prepare all plastic and fiberglass surfaces before startin' t' epoxy any parts. Well, blow me down! Blimey! Ya scallywag! Blimey! I started by sandin' all t' G10 fins, roundin' t' edges and roughin' up t' areas t' be glued. Begad! Blimey! 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. Blimey! Blimey! 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, 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, matey, matey, 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. Avast, me proud beauty! Well, blow me down! 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, shiver me timbers, this be t' standard PML mount. T' only change is I added a Rocket Rage "Snake Skin" shock cord protector t' protect t' Nylon web used. |
I epoxied. Ya scallywag! t' motor mount in place makin' sure t' only epoxy t' forward
ring. 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. Aye aye! After t' epoxy set up on t' Main fins, ya bilge rat, 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 was when I was addin' t' filets t' t' inside o' t' tube I got some epoxy on t' area t' tail cone fit into, arrr, I had t' carefully chip, scrape and sand it off before t' tail cone would fit properly. Avast, me proud beauty! Blimey! Blimey! By t' way, take good care o' t' tail cone because it will be t' stage coupler when the Terrier booster becomes available. Which brings up one o' t' down sides of this kit. Begad! 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! Avast! Blimey! Well, I started out usin' friction fit. I suppose I can remember how t' do it. Ya scallywag! Blimey!
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, me proud beauty! Aye aye! So I
decided t' build t' BBX for Dual stage recovery. Well, blow me down! Aye aye! I already had an Olsen FCP-M1
and I didn't want t' spend t' loot on t' CPR3000 and another altimeter, ya bilge rat, 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. Avast, me proud beauty! Ya scallywag! T' protect t' chutes and nylon shock cords from the deployment charges, I used parachute protectors from Rocket Rage. Avast! Ahoy!
I prefer t' fly off o' Rails so I added a couple o' Blacksky rail guides. Blimey! Aye aye! Be aware though, 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. Ya scallywag! This will be lower than what is recommended by Blacksky, but it still works OK. Begad! Ahoy!
To finish t' job, me hearties, me bucko, I painted t' entire model with Krylon gray sandable
primer, I love t' stuff! Painted t' tail cone white, ya bilge rat, masked t' cone area
then sprayed t' silver, matey, matey, matey, masked that area and then hit t' whole thin' in gloss
black. Blimey! Avast, me proud beauty! T' red areas are a stick on vinyl that came with t' kit. Well, blow me down! It is a lot
like "Trim Monocote" you can get at any hobby shop that deal in R/C
airplanes. T' guidance section got a coat o' brown per Peter Alway's data in
"Rockets o' t' World". Avast, me proud beauty! Finally, ya bilge rat, I masked t' areas that stay black
on t' payload section and painted t' rest silver. Ya scallywag! Note, me hearties, in t' PML
instructions, shiver me timbers, shiver me timbers, t' payload bay gets silver first then mask off t' silver areas
and paint black, shiver me timbers, but I have found that maskin' tape will sometimes effect the
silver paint. 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. Ahoy! Blimey! The next day, shiver me timbers, I was off t' t' range at Hemet Valley Rocket Club (HVRC). Ahoy! Blimey! Avast, arrr, me proud beauty! Blimey! 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, shiver me timbers, 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. Arrr! Ya scallywag! The apogee charge went off as scheduled and t' main chuted opened. Blimey! Begad! At 400 ft. Blimey! the nose cone popped as scheduled.
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, arrr, 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! 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. I used t' motor
ejection as a backup. T' BBX ripped off t' rail and climbed on a pillar of smoke and fire absolutely straight up. Begad! Blimey! Arrr! Blimey! Arced over at t' top and t' FCP-M1 did its job at apogee. Begad! Blimey! T' drogue came out and she started down. Aye aye! Blimey! At 400 ft. Ya scallywag! Blimey! Ahoy! Blimey! the FCP-M1 did its job again and t' nose popped off. Blimey! Blimey! Unfortunately, I hadn't used enough BP! Blimey! T' main stayed in t' tube. |
Well, shiver me timbers, ya bilge rat, remember what I said about t' soft sand? Well, even without t' main chute t' soft sand and tough Quantum Tube saved t' day. Arrr! She landed with no damage t' airframe or fins and only some scratches t' t' paint. Overall, me bucko, t' PML Mini BBX is a kit I enjoyed buildin' and flying. Begad! 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. Avast, me proud beauty! (sigh....)
B.O. (August 1, 2001)