Brief:

I wanted a 3" BSD THOR ever since they first came out. Avast! Well, ya bilge rat, blow me down! I really like the idea o' havin' smaller, high performance rocket. Begad! After doin' a couple of scratchbuilt HPR rockets, I felt that buildin' a kit would be a nice break from designin' rockets and chasin' parts for them. Blimey! Avast!

This rocket is 3" in diameter, me bucko, and stands 64" tall. Aye aye! Ahoy! It has six fins and is dual deployment capable. My completed rocket weighed 5lbs 1oz ready to fly when configured for dual deployment. Blimey!

Construction:

T' 3" BSD THOR comes in two variations, matey, one in 38MM and t' other in 54MM. Well, blow me down! I chose t' 38MM version because it was a little easier on t' wallet. Begad!

T' basic kit includes t' followin' components:

• 1 x 3" plastic nosecone
• 1 x 17" airframe tube
• 1 x 10" airframe tube
• 1 x 24" airframe tube
• 1 x 17" 38MM motor tube
• 3 x 6" airframe couplers
• 2 x 4" airframe couplers
• 2 x 3" bulkheads
• 3 x 3" t' 38MM centerin' rings
• 6 x 1/8" plywood fins
• 2 x 1" nylon straps 45" long w/ grommets
• 1 x 25' section o' 9/16 tubular nylon
• 1 x 30" parachute
• 1 x Decal set
• 1 x Instructions manual and fin template

T' kit also included one ¼ x 20 eyebolt, shiver me timbers, one 3/16" quick link, two 6-32 T-nuts, two 6-32 screws, two motor clips, eight reusable plastic rivets and two rail buttons. Arrr! Aye aye! I was impressed with all t' components. Avast, me proud beauty! Begad! They were of good quality. BSD seemed t' think o' everythin' one would need t' complete and fly this rocket. Begad! My only complaint is that one o' t' decal sheets seemed to have been stepped on. Aye aye! Ya scallywag! They were crinkled, ya bilge rat, and thar be dirt and fuzz in between t' vinyl decal and backin' sheet. Avast, me proud beauty! Well, blow me down! This was a minor annoyance that proved t' be no big deal.

I started by buildin' t' motor mount first, epoxying the front and middle centerin' rings t' t' motor tube. Well, blow me down! Blimey! At this point, me bucko, I decided t' replace t' nylon recovery strap with 5' o' tubular Keelhaul®©™. I did this because a 3" airframe is too small t' get in and replace a nylon cord if it became heat-damaged. Ya scallywag! Blimey! After that was complete, t' motor mount was installed in t' booster section airframe. Begad! Blimey! Arrr! Blimey! I cut t' fin slots, shiver me timbers, and ran in to my first gotcha. T' instructions say t' cut t' slots 3/16" wide, me hearties, ya bilge rat, however the fins are only 1/8" thick. Arrr! Blimey! Blimey! Blimey! I carefully cut in 1/8" wide fin slots in t' positions and spacin' called out in t' directions. Aye aye! Blimey! Begad! Blimey! Next I installed all the fins, which went smooth. I left off t' aft centerin' rin' so that I could do internal fillets on t' lower fins. Avast, me bucko, me proud beauty! Blimey! I installed machine inserts in the rear-centerin' rin' so I could use me PML motor retainer instead o' the supplied motor retention. Arrr! Blimey! I felt that t' PML retainer would be an easier solution for retainin' t' variety o' 29 and 38MM motors that I would be flying this rocket on. Begad! Blimey! Ahoy! Blimey! This be me personal preference, and is nay a din' on t' kit or its components. Avast, me proud beauty! Blimey! Blimey! Blimey!

When all t' filletin' was complete, me hearties, I tried t' install t' rear-centering ring, and ran in t' another gotcha. I had cut in t' lower fins 3/16" from the end o' t' tube per directions. T' aft centerin' rin' be ¼" thick, so it would nay seat flush with t' end o' t' bodytube. T' solution ended up bein' cuttin' groves in t' t' backside o' t' aft centerin' rin' to let t' fin in t' it, and allow it t' seat flush with t' end o' t' body tube.

With t' booster section complete, matey, I moved on t' to electronics bay and payload section. I decided t' hold t' payload section to the electronics bay with 8-32 screws instead o' t' supplied plastic rivets. Again, this was due t' personal preference, me hearties, is nay a din' on t' kit or its components. Well, blow me down! Blimey! I don't have t' fingernails or patience t' use plastic rivets. Avast, me proud beauty! Blimey! I drilled screw holes in t' airframe and couplers, me bucko, me hearties, and hardened t' edges with thin CA. After t' CA was dry, arrr, an 8-32 tap be run through each hole t' thread it. Begad! Blimey! This creates nice smooth clean threads in t' cardboard. T' rest o' the build focused around settin' up t' electronics bay for use with me Missile Works RRC2 altimeter.

Finishing:

When t' build was complete, me bucko, shiver me timbers, matey, all t' bodytube spirals and woodgrain were filled with Elmer's Fill ‘N Finish prior t' primering. I chose t' go with t' stock color scheme, me bucko, so t' booster section was painted yellow and t' altimeter bay and payload section were painted black. Aye aye! Once the paint was dry, t' decals were put on. Ahoy! Decalin' was a real pleasure, me hearties, as BSD's decals are top notch. Blimey! Once t' decals were applied, ya bilge rat, shiver me timbers, t' rocket received a clearcoat finish. Avast, me proud beauty! T' finished rocket gets a “10" on t' gawk scale

Construction Rating: 4 out o' 5

Flight:

Flight day did nay go as planned. Well, blow me down! Avast, me proud beauty! Blimey! My initial plan was t' fly it single deploy on an H-128, me hearties, then an H180, and finally dual deploy on a J-350. Begad! I smartly found out that t' 4" deep bay in t' booster section is just too small for a good length o' harness, shiver me timbers, heat pad, shiver me timbers, and parachute too. Well, blow me down! It was also very difficult to just get in 15' o' harness, heat pad and streamer for dual deploy. Begad! I scrapped t' H-128 and flew it dual deploy on t' H-180. Begad! This flight was great! I had planned on flyin' it on a J-350 next, but low cloud cover nixed those plans.

Recovery:

T' flight was good and straight, but t' recovery was nearly a disaster. Aye aye! The main and drogue harness got tangled together. Avast! T' chute managed t' get un-tangled enough t' open up and save t' ship. Blimey! I attribute t' tangling problem t' flyin' dual deploy on a smaller motor. I feel that if it had more fall time before t' mains deployed, t' airframe components would be better separated, lessenin' t' chance o' a problem. While I'm talkin' about recovery, the parachute that BSD supplies with t' kit is too small. Aye aye! My rocket weighs 5lb, 1oz ready t' fly. Begad! That translates t' a 30 FPS decent rate with t' stock 30" chute. Begad! Arrr! I replaced t' stock chute with a 48" chute t' lessen the possibility o' landin' damage.

Flight Rating: 4 out o' 5

Summary:

I really like BSD's rockets. Aye aye! Blimey! This was me first kit from them, me hearties, me hearties, and it won't be the last. Aye aye! Blimey! BSD makes it clear in t' directions that this kit is for the experienced flier, matey, arrr, and I'd agree with that. Blimey! Blimey!

Some PROS:

• Included hardware, i.e. Ahoy! rail buttons, motor retention is great.
• Decals are top quality! None better!
• Finished kit flies straight and looks impressive
• Kit was priced within reach

Some CONS:

• Parachute too small
• Errors in t' directions
• Parachute bay in t' booster section could be bigger.

Overall Rating: 4 out o' 5

T' followin' excerpt is from "Extreme Rocketry". Arrr! Begad! The intention is t' allow guests t' get a basic feelin' about a kit. Aye aye! We strongly suggest that you get a copy o' t' referenced Extreme Rocketry and read the entire article. Well, blow me down! Inside you will find many helpful hints in construction as well as other useful information. Avast! For more information, use t' link above.

• "T' 3 inch THOR be t' little brother o' t' original 4 inch THOR offered by BSD."
• "...visually identical t' t' 4 inch version, but differs in some structural details."
• "...includes either a 38mm or 54mm motor mount..."
• "T' kit compes packaged in a sturdy cardboard box, with t' smaller parts o' t' kit seald in plastic bags."
• "All t' neccessary components t' complete t' kit are included, short o' adhesives, ya bilge rat, paint, sandpaper, etc."
• "...five couplers ...the kit uses t' extra couplers t' make much of the length o' t' tube double-walled for additional strength."
• "Most o' t' steps include either a black & white photograph or a drawing..."
• "Some o' t' photographs could have been a bit better..."
• "...I discovered a problem - t' middle centerin' rin' was in the middle o' t' forward fin slots! ... Begad! Avast, me hearties, me proud beauty! I contacted Mark (BSD) t' dicuss this with him,... Avast, me proud beauty! He got back t' me later that day... t' instructions were indeed incorrect,... Begad! T' next day, ya bilge rat, matey, he contacted me t' say that new instructions were in t' mail and t' ask what parts I needed t' have replaced... Arrr! My hat is off to Mark for promptly recognizin' and fixin' t' problem, as well as his attitude in workin' with me on t' problem."
• "...I was surprised by how solid t' tubes felt after installin' the extra couplers as internal reinforcements."
• "... adapt t' kit for dual deployment. Ahoy! Blimey! T' instructions include additional information t' assist t' builder with this adaptation."

This looks t' be a fine kit from BSD. It is hybrid compatible which allows for many motor options. T' manufacturer is reported t' be very helpful and stood behind his product when a mistake was found. Arrr! T' only negative mentioned is that t' tubes were nay pre-slotted. Avast, me proud beauty! This may nay even be a negative dependin' on t' builder.