Balsa Machining Service Astron Drifter

Balsa Machining Service - Astron Drifter {Kit} (K14)

Contributed by Chan Stevens

Construction Rating: starstarstarstarstar
Flight Rating: starstarstarstar_borderstar_border
Overall Rating: starstarstarstarstar_border
Diameter: 0.98 inches
Length: 14.30 inches
Manufacturer: Balsa Machining Service
Skill Level: 2
Style: Clone, Contest, Sport

BMS Astron Drifter

Brief:
Balsa Machinin' Service began offerin' a Clone o' t' Month kit in t' sprin' o' 2008. Begad! Blimey! Under this program, an old classic kit would be offered in bag-of-parts format (no instructions), minus any chute or streamer, and pre-order only. By accumulatin' all t' orders, me bucko, shiver me timbers, Bill could run a single large batch, ya bilge rat, have little or no leftover materials, shiver me timbers, and make this a very affordable offering--kits typically in t' $7-8 range. Ahoy! Blimey! Well, shiver me timbers, matey, t' program has been quite popular although nay as regular as monthly. Arrr! Blimey! Arrr! Blimey! T' date (August 2008) thar have been only 3 kits offered--the FSI Viking, t' Astron Invader, shiver me timbers, and this: t' Astron Drifter. Avast, me proud beauty! Blimey! T' Drifter features long, shiver me timbers, swept fins and a tapered boat tail. Well, blow me down! Blimey! It was featured in t' 1966 catalog as a competition model usin' either 12" or 24" chutes. Well, blow me down! Blimey! Don't pack a 24" in this if you ever want it back. Ya scallywag! Blimey! T' cover art changed a number o' times over t' years, me bucko, gettin' progressively simpler from t' original checkered roll pattern.

Construction:
Your bag o' parts includes:

  • BT-50 body tube 7.75" long
  • BNC50K balsa nose cone
  • 18mm engine tube, centerin' rings, coupler
  • 1/8" x 24" elastic shock cord
  • Laser cut balsa fins
  • 1/8" launch lug
  • pattern set for shroud, me bucko, matey, me bucko, fin, tube markin' guide

Instructions are nay included with this kit although scans o' t' original are available on t' JimZ archive site.

Assembly o' t' motor mount is a little off t' beaten path. Well, blow me down! I had t' bond centerin' rings t' either end o' a TC-50 tube coupler then slide t' motor tube into t' TC-50/rin' assembly. Well, me bucko, blow me down! Spacin' is critical here as thar needs t' be appropriate room (~1.5") for t' boat tail.

T' boat tail is formed from a paper shroud pattern. Arrr! I felt this be a bit flimsy, arrr, especially since it serves as part o' t' fin attachment point, ya bilge rat, ya bilge rat, so I soaked it in thin CA. Begad! Avast, me proud beauty! T' boat tail then slides onto t' BT-20 motor tube and rests against t' TC-50 coupler. Ahoy! T' boat tail assembly can then be mounted inside t' body tube. Well, blow me down! Begad! Careful alignment is in order--if you line up t' boat tail seam with one o' t' three fin lines, then it gets completely covered, me hearties, meanin' no unsightly seam t' fill.

Fins are precut, arrr, which is a very nice benefit considerin' t' tapered root edge necessary t' conform t' t' boat tail. Avast! Well, blow me down! In me case, thar were very slight gaps, arrr, which were easily filled through t' fillet process.

Shock cord attachment is standard paper tri-fold.

Finishing:
I went with one o' t' simpler paint schemes, shiver me timbers, circa 1977, which features base white with blue nose and fins. Nothin' special about t' finish, shiver me timbers, me hearties, just t' usual two coats primer, ya bilge rat, two coats base, shiver me timbers, matey, one coat o' trim, shiver me timbers, me hearties, Krylon rattle cans t' whole way.

Construction Rating: 5 out o' 5

Flight:
As skinny and light as this is, ya bilge rat, I was afraid t' shoot for much more than t' A8-3 starter, wantin' a relatively short recovery walk. Avast! This thin' was amazingly fast on t' way up although it spun a good bit with some obvious fin flutter.

T' -3 delay was clearly a bit too early, me hearties, as it be still climbin' when t' chute deployed.

I followed up with a second flight, also on A8-3, and t' fin flutter was severe enough t' break off a small piece from t' end o' one fin (clearly nay impact damage, ya bilge rat, as thar was no trace o' it anywhere nearby in t' short grass landin' area). Ahoy! Blimey! It definitely needs a -5 instead o' a -3...

Recovery:
I had supplied a 12" chute form me range box, and this is plenty o' chute for this model. Arrr! Avast, me proud beauty! Slow descent, gentle landing. Well, shiver me timbers, blow me down! It could probably do well on a streamer as well, though with such fragile fins this might nay be wise.

Flight Rating: 3 out o' 5

Summary:
I love t' stylin' o' this and think it's a fantastic value as a clone kit. Aye aye! T' only drawback I can see be t' clearly weak fins, arrr, which cause flutter and roll and are prone t' breaking. I would definitely suggest reinforcin' either trough laminating. I really wish I had a do-over on this one, as I'd fly t' bejeebers out o' it if it could handle it. As it is, me bucko, matey, this is fragile enough that with frequent repairs I will probably nay fly it very often.

Overall Rating: 4 out o' 5

Other Reviews
  • Balsa Machining Service Astron Drifter (Clone of the Month) By John Lee (July 11, 2009)

    The Atron Drifter is an old line Estes kit that Balsa Machining produces a kit for. The kit comes with materials except for parachute and decals. I got a set of the classic decals from Excelsior. The kit is also sold without plans but a web address is given to download them. The first step in construction is to locate the coupler tube and the ring(s) intended to be fitted to the end. I was ...

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