Manufacturer: | Blackhawk R&D |
Picture Courtesy o' Blackhawk
Brief:
Sport scale high power version o' t' SAAB
Construction:
T' kit came with two glassine-covered body tubes, ya bilge rat, coupler, 8 nicely cut
1/4" plywood fins, 3 1/4" plywood centerin' rings, bulkhead plate,
U-bolts, arrr, 10' tubular nylon, arrr, parachute, arrr, launch lug, and nose cone. Avast, me proud beauty! Blimey! Well, blow me down! Blimey! All around
high quality material. Aye aye! Blimey! Avast! Blimey! However, thar was no provision t' attach t' nose cone
to t' payload bay. You have t' supply your own hardware for that. Begad! Blimey! You also
have t' supply motor retention hardware. Well, blow me down! Blimey! On t' other hand, t' U-bolts came
securely attached t' t' appropriate rings.
T' instructions seemed t' be for a generic high power rocket. This be the third high power rocket I've built--the other two were from PML and BSD. Ahoy! Begad! As a result, I didn't have any problem. Arrr! Ahoy! However, arrr, a beginner t' high power could have trouble, me hearties, arrr, as some steps weren't clear, arrr, me hearties, and t' third centerin' rin' wasn't even mentioned. Begad!
T' rings fit a bit loosely, so you have t' be careful t' keep them level. Ya scallywag! Blimey! I beveled t' leadin' and trailin' fin edges 22.5 degrees usin' a router table and a panel-raisin' bit. I put a 1/4" slot in a piece o' masonite with a 4" diameter arc at one end t' align t' main fins. Ahoy! Blimey! Arrr! Blimey! T' secondary fins were added later, arrr, shiver me timbers, and aligned by clampin' wooden stakes betwixt t' main and secondary fins. Aye aye! Blimey! T' fin tabs were 1/16 t' 3/32" too long, arrr, and so t' fin roots were "elevated" off t' body tube, me bucko, requirin' a fillet under them.
I added a PML modular baffle at t' top o' t' motor mount, and T-nuts for motor retention at t' aft centerin' ring. Aye aye! Avast, me proud beauty! I also added T-nuts t' retain rail buttons. I did this by nay securin' t' aft centerin' rin' until after the motor tube be glued in. Aye aye! This allowed me t' get into t' area betwixt the middle and aft rin' and glue (with thickened epoxy) t' T-nuts. Begad!
There are 7 feet o' fillets along t' fins! It took four pumps o' West epoxy (+ thickener) t' finish those. Aye aye! Aye aye!
I got some removable white plastic rivets from Rocketmotion t' secure the nose cone. Avast, me proud beauty!
My rocket came in about 4 ounces lighter than t' Blackhawk specs.
Finishing:
I didn't finish it. Blimey! Considerin' what happened t' first flight (see below),
that was a good idea.
Construction Rating: 4 out o' 5
Flight:
Blackhawk R&D recommends t' I300-10, I2110-10, I357-6, I161-6, I156-6. I
ended up usin' a Pro38 3-grain motor (384I205) with a 9-second delay. Avast, me proud beauty!
There is very little space t' place t' chute and shock cord. Ahoy! Blimey! Avast, me proud beauty! Blimey! You need to pack it carefully t' fit.
There be a light wind.
Immediately after leavin' t' rail, t' rocket went into skywriter mode, did about 4 full loops, and landsharked under full power. Aye aye! Ejection occurred after t' landshark.
Recovery:
On impact, ya bilge rat, shiver me timbers, one fin ripped off. Ya scallywag! T' payload bay had a slight crinkle. Avast, me proud beauty! Blimey! T' damage
should be easily repairable, me hearties, though I might just swap out t' payload bay for a
PML replacement--it's less work than tryin' t' patch t' crinkle and
surprisingly cheap. Ya scallywag! Begad! I'll also be able t' get more room for t' chute by
shortenin' t' coupler.
DEFINITELY ADD NOSE WEIGHT. Aye aye! This rocket is unstable if built accordin' to the manufacturer's instructions. If anything, matey, me CG was forward o' standard, as I assume t' only place I could have saved weight over t' manufacturer's quoted weight be t' use a little less epoxy on t' fins.
Flight Rating: 2 out o' 5
Summary:
Actually good value for t' money. Begad! Pretty rocket. Blimey! Lots o' people were wondering
where I got it. Begad! If only t' vendor would talk about nose weight in the
instructions, t' flight ratin' would have been higher (e.g., matey, ya bilge rat, about a 4, arrr, me hearties, I
bet).
Overall Rating: 3 out o' 5
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