Diameter: | 2.10 inches |
Manufacturer: | Public Missiles |
Style: | Scale |
I must admit, I am becomin' a real fan o' PML kits. Normally I like t' scratch build, but when I feel t' need t' put somethin' together in a hurry, PML is definitely t' way to go for high quality, durable kits.
T' Mini BBX is a new released by PML. Ahoy! What caught me attention be t' news that t' Mini BBX is goin' t' have a Terrier Booster t' be released in the Fall. Aye aye! T' combination o' a good lookin' scale kit combined t' challenge o' two stages be irresistible t' me. Ahoy! What a great way t' get started in High power staging!
Construction o' t' Mini BBX is a straight forward PML kit. No
surprises! I opened t' bag as soon as I got home from Hobbytown USA and inventoried the parts as usual, they were all thar and in good shape. |
I assembled t' parts dry t' make sure all would fit, ya bilge rat, me bucko, and of
course, they did. Begad! I decided t' prepare all plastic and fiberglass surfaces before startin' t' epoxy any parts. Avast, me proud beauty! Blimey! Blimey! Blimey! I started by sandin' all t' G10 fins, roundin' t' edges and roughin' up t' areas t' be glued. Aye aye! 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! Begad! 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. Ya scallywag! Begad! 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. Begad! Well, blow me down! 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, 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. 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. After t' epoxy set up on t' Main fins, arrr, 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, ya bilge rat, I had t' carefully chip, scrape and sand it off before t' tail cone would fit properly. Avast! By t' way, take good care o' t' tail cone because it will be t' stage coupler when the Terrier booster becomes available. Blimey! Blimey! Which brings up one o' t' down sides of this kit. Well, blow me down! 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. Aye aye! Well, me hearties, I started out usin' friction fit. Begad! I suppose I can remember how t' do it.
Since I plan t' fly me Mini BBX on I200's and in t' two stage
configuration, ya bilge rat, I will probably be gettin' some very high altitude flights. Aye aye! Blimey! So I
decided t' build t' BBX for Dual stage recovery. Begad! I already had an Olsen FCP-M1
and I didn't want t' spend t' loot on t' CPR3000 and another altimeter, 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. Ahoy! T' protect t' chutes and nylon shock cords from the deployment charges, arrr, I used parachute protectors from Rocket Rage.
I prefer t' fly off o' Rails so I added a couple o' Blacksky rail guides. Blimey! Blimey! Be aware though, matey, 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. Avast, me proud beauty! Aye aye! Blimey! This will be lower than what is recommended by Blacksky, but it still works OK.
To finish t' job, I painted t' entire model with Krylon gray sandable
primer, 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. T' red areas are a stick on vinyl that came with t' kit. Aye aye! It is a lot
like "Trim Monocote" you can get at any hobby shop that deal in R/C
airplanes. Begad! T' guidance section got a coat o' brown per Peter Alway's data in
"Rockets o' t' World". Aye aye! Finally, I masked t' areas that stay black
on t' payload section and painted t' rest silver. Avast! Note, matey, 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. Well, blow me down! 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. Blimey! Avast, me proud beauty! The next day, I was off t' t' range at Hemet Valley Rocket Club (HVRC). T' BBX's test flight be on a whimpy little G64 and t' main chute t' deploy out o' the main airframe so that if t' electronics had a problem, arrr, I would still get the main chute out on t' motor's ejection. |
T' boost was straight and true up t' 664 ft. Avast, me proud beauty! per t' Olsen FCP-M1. Avast! Avast! The apogee charge went off as scheduled and t' main chuted opened. Ahoy! Blimey! At 400 ft. Blimey! Avast! the nose cone popped as scheduled. Begad!
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. Arrr! Begad! I moved the
main chute t' t' forward compartment t' it would deploy at 400 ft. Arrr! and put a
12" drogue into t' main airframe t' deploy at apogee. Arrr! I used t' motor
ejection as a backup. Begad! T' BBX ripped off t' rail and climbed on a pillar of smoke and fire absolutely straight up. Blimey! Arced over at t' top and t' FCP-M1 did its job at apogee. T' drogue came out and she started down. Blimey! Well, shiver me timbers, blow me down! At 400 ft. Avast! Ahoy! the FCP-M1 did its job again and t' nose popped off. Well, blow me down! Avast, me proud beauty! Unfortunately, I hadn't used enough BP! T' main stayed in t' tube. |
Well, shiver me timbers, ya bilge rat, remember what I said about t' soft sand? Well, me bucko, even without t' main chute t' soft sand and tough Quantum Tube saved t' day. She landed with no damage t' airframe or fins and only some scratches t' t' paint. Overall, t' PML Mini BBX is a kit I enjoyed buildin' and flying. Ahoy! 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. Ya scallywag! Avast, me proud beauty! (sigh....)
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B.O. (August 1, 2001)