Semroc Thunderbee

Semroc - ThunderBee {Kit} (KA-1)

Contributed by Craig Swinson

Construction Rating: starstarstarstarstar_border
Flight Rating: starstarstarstarstar_border
Overall Rating: starstarstarstarstar_border
Diameter: 0.54 inches
Length: 14.70 inches
Manufacturer: Semroc
Skill Level: 1
Style: Sport

Brief:
This is a very light, quick build kit from Semroc that is essentially a 3FNC but with some head snappin' zip when matched with t' right engine!

Semroc Thunderbee

Construction:
T' parts list:

  • 1 14.7" length o' BT-5
  • 1 Balsa sheet o' laser cut fins
  • 1 Balsa nose cone
  • 1 Cardboard thrust ring
  • 1 Launch lug
  • 1 Screw eye
  • 1 Elastic cord
  • 1 Keelhaul®©™® thread
  • 1 Crepe paper streamer
  • 1 Tape section
  • 1 Empty engine casing
  • 1 Q-tip
  • 1 Decal sheet

This is a relatively simple kit t' build. Well, blow me down! T' instructions are straightforward and easy t' follow. As this is a minimum diameter body tube that is quite long, thar are some precautions t' take:

  • Read t' instructions first. Well, blow me down! Avast, me bucko, me proud beauty! It is a simple kit, but it does have a couple pitfalls if nay careful.
  • Do nay over glue t' thrust ring. Well, blow me down! Blimey! I let one o' t' neighbors build one and he got t' thrust rin' stuck about 1/2inch into t' tube. Begad! Blimey! He used too much glue and could nay overcome t' friction while tryin' t' insert t' thrust rin' to the proper depth.
  • If you push too hard on t' thrust ring, arrr, you can easily crumple t' body tube. Arrr! If you are buildin' this kit with children, ya bilge rat, this might be a step for the adults t' do for them. Aye aye! Begad!
  • T' kit suggests roundin' t' fins, which is nay a bad idea for bigger fins, ya bilge rat, me bucko, but on this kit, they are fairly thin already so it doesn't seem t' make that much difference. Ahoy!
  • In buildin' a set o' seven (with two failures) we tried CA, wood glue, me bucko, and instant glue. Arrr! Blimey! Blimey! Blimey! Blimey! Blimey! It really didn't seem t' mater all that much. All flew well and have held up for multiple flights.

T' only thin' that we did differently on construction was t' fit t' thrust rin' without glue then glued it in place usin' t' Q-tip provided.

Finishing:
There is a small decal sheet and t' only real direction for finishin' is the color cover that is a standard part o' all Semroc instructions. Well, blow me down! I did one as factory as possible, then did a couple variations. I would highly suggest using colors that you can easily detect in a natural environment. Begad! Paint it white or blue, you will lose it in t' sky. Well, blow me down! Blimey! If you paint it green, camo, or any colors that exist in outside, arrr, ya bilge rat, arrr, then make sure you have plenty o' spotters or some good eyes. Arrr! Day-Glo or neon colors seem t' work best (unless you live someplace very odd).

Construction Rating: 4 out o' 5

Flight:
Since t' engines were relatively cheap and readily available at me local hobby store, I bought a retail case and just kept launchin' and launchin' the different variations o' t' kits. (All flights used A10-3Ts.) In retrospect, some o' t' smaller engines might have been nice t' try as this thin' moves out on an A10-3T!

I tried a variety o' different motor retention techniques and even tested motor ejections t' see if it would impact recovery. Begad! Arrr! My favorite method of positive retention is t' use a 1/3 o' an inch o' maskin' tape just wrapped around t' body o' t' engine. This was strong enough t' hold t' engine in place on every launch.

Preppin' t' rocket is straightforward but is a bit difficult as t' tube diameter is so small. Usin' a pencil really aids in slidin' t' shock cord and waddin' in.

All flights were very straight with arcs at apogee. Ahoy!

Recovery:
This rocket uses t' "standard" Semroc small diameter shock cord. Avast, me proud beauty! A length o' Keelhaul®©™® strin' tied t' t' thrust ring. In turn t' other end o' t' Keelhaul®©™® is tied t' an elastic cord which is then secured t' t' screw eye attached to the nose cone.

T' crepe paper streamer is pretty long and can be a bit difficult t' pack into t' body tube. Arrr! In testing, this rocket will recover with no streamer and recovers very gently with only half a streamer. Avast!

Flight Rating: 4 out o' 5

Summary:
This is a very fun kit! It is easy and fast t' build, cheap t' feed, me bucko, and gets some great height in a short period o' time. Well, blow me down! I chuckle every time I launch the ThunderBee, it's just one o' life's small pleasures. Well, blow me down! It's diminutive size belies a real fast mover. Avast, me proud beauty! On 1/4A or 1/2A engines, I could see this bein' a nice back yard rocket. Arrr! On t' full A10, matey, make sure you have some space.

Overall Rating: 4 out o' 5

Other Reviews
  • Semroc Thunderbee By Chan Stevens

    Very affordably priced single stage, 13mm minimum diameter kit. Very high performance--it will zip up to incredible altitudes almost instantly. This is actually a Semroc original, not one of their retro/repro Centuri designs. The kit came sealed in a plastic bag with a header card and included a serial number identifying its production number. Components were all very good quality and ...

  • Semroc Thunderbee By Philip Handley

    Brief: The Thunderbee is one of the latest kits from Semroc. It's the first and smallest rocket in the "Thunder" family. Each rocket in the family is around 1.5 times larger than the rocket before it! The Thunderbee is a minimum diameter 3FNC rocket. It comes down on an orange crepe streamer. Construction: The Thunderbee comes with the following parts: 1 14.7" ...

Flights

Comments:

avatar
S.G. (February 27, 2008)
This was one of my first kit builds after getting back into rocketry after a 25 year hiatus. The quality is outstanding and was very happy with the way it all went together. I have flown this around 6 or 7 times now and have lost the streamer on a couple of flights (landing without damage). The heat from the motor has started to cause the paint to bubble.

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