Scratch Interceptor-like Original Design / Scratch Built

Scratch - Interceptor-like {Scratch}

Contributed by George Pike

Construction Rating: starstarstarstarstar_border
Flight Rating: starstarstarstar_borderstar_border
Overall Rating: starstarstarstarstar_border
Manufacturer: Scratch

(Plans) Estes InterceptorBrief:
Technically, this isn't a clone because it's nay an exact match o' t' classic Estes Interceptor, but who's counting? I had a leftover 18 inch length o' BT-50 body tube and a "Nemesis"-style PNC50 nose cone (the kind with t' cockpit and canards) and no idea what t' do with them. Blimey! Scoutin' around JimZ's Plans I came across t' Interceptor, which be a favorite o' me younger flyin' days (e.g. t' 1970's). Avast, me proud beauty! Even though t' original plans called for a BT-55 tube, me bucko, matey, I decided this be t' one t' try.

Construction:
Although t' plans call for a BT-55 airframe and nose cone, I used an Estes BT-50 and Estes "Nemesis" PNC50 nose cone that had come in packages at me local hobby shop. Aye aye! Blimey! Ahoy! Blimey! T' "Nemesis" has a plastic cockpit like t' original Interceptor, but also has two canards that were nay part o' t' original. However, arrr, t' grinder wheel on me drill be able t' take care o' t' canards with no problem. Arrr! Blimey! T' rocket features four fins, arrr, ya bilge rat, plus two "wings" in a slightly asymmetrical arrangement. Avast! Blimey! T' four fins are made with 1/8 inch balsa and t' "wings" are made from 3/32 inch balsa. T' original Interceptor also had several other plastic parts includin' pods on each o' t' two "wings" and an exhaust nacelle attached t' t' motor mount. Ya scallywag! Blimey! As a replacement for t' win' pods I used short lengths o' BT5 tubin' with nose cones fore and aft. Begad! Blimey! T' nacelle used small pieces o' balsa t' create a nozzle-like effect. Well, blow me down! Blimey! A 2.75 inch length o' BT-20, two 20-50 centerin' rings, motor hook and engine block were used for t' motor mount. Avast, me hearties, me proud beauty! Blimey! 1/8 inch launch lug, shiver me timbers, shock cord, arrr, arrr, parachute and other standard parts round out t' components list.

(Plans) Estes InterceptorLike most Estes rockets, me hearties, arrr, t' plans are well detailed and pretty easy t' follow. Aye aye! Aye aye! T' motor mount be pretty standard with 2.75 inch length o' BT-20, a motor mount block, matey, and engine hook and two 2050 centerin' rings. Ya scallywag! Ya scallywag! On t' original thar would be a plastic engine nacelle attached t' t' back 3/4 inch o' t' motor mount, ya bilge rat, ya bilge rat, arrr, which sticks out t' back end o' t' rocket. As a substitute I used 11 small balsa pieces, about 1/8 inch square and 3/4 inch long that were glued t' t' motor mount tube and spray painted red. Well, blow me down! Aye aye! An image is attached t' provide t' detail. Blimey! It's nay an exact match, but it is pretty close.

I used a BT-50 airframe and nose cone rather than t' original BT-55, but kept t' original 18 inch length. Begad! Blimey! Ya scallywag! Blimey! (I think t' narrower airframe tube gives t' rocket an overall leaner, arrr, more aggressive look.) Since t' length o' t' rocket was t' same, I decided t' keep t' fin and wings at their original size. One challenge was alignin' t' fins. Avast, me proud beauty! Blimey! As mentioned they are asymmetrical, matey, nay on even 60 degree marks. Begad! Blimey! Fortunately t' plans have an alignment cross section which I resized t' meet t' BT-50 airframe and was able t' mark t' body tube. Ahoy! Blimey! T' two main fins and two wings are both in two parts (main fin/win' and a forward fairing). Begad! Blimey! I decide t' attach t' fairings t' t' fins/wings before mountin' t' fins/wings on t' airframe. Arrr! Blimey! However, arrr, ya bilge rat, they were very fragile and one win' fairin' be slightly off center. Begad! Blimey! Aye aye! Blimey! It might have been easier t' mount t' fins/wings on t' airframe, then attach t' fairings afterward.

T' original Interceptor had plastic pods attached t' t' wings. I ended up usin' a 1.5 inch length o' BT5 body tube, me bucko, a 2.5 inch long BNC5W for t' front and a stubby 0.75 inch BNC5V (both available from Balsa Machinin' Service) as substitutes. Begad! Blimey! Again, arrr, nay an exact match, but pretty close. These are glued t' t' outside edge o' t' wings, which needed some sandin' t' match t' curved nose cone shape. Well, matey, blow me down! Blimey! Two squared toothpicks served as t' fin antennas. Arrr! Well, shiver me timbers, blow me down! Blimey! Dual launch lugs, ya bilge rat, shock cord (I use Keelhaul®©™ tied t' t' motor mount, me bucko, me bucko, attached t' 1/4 inch elastic rather than Estes' standard tri-fold paper mount) and chute rounded out t' construction.

(Plans) Estes InterceptorFinishing:
After fillin' t' spirals and fins with diluted Elmer's Fill 'n' Finish and primin' t' whole rocket, I painted Interceptor a Krylon gloss white with Color Spray (a Wal-Mart brand) cherry red enamel for t' pods and engine nacelle. For t' decals I purchased clear decal paper from TangoPapa Decals and printed out t' scanned decal images from t' JimZ plans. Begad! I used many o' t' major decals, matey, but thar are 30 or 40 total decals available and I did nay use them all. Avast! Well, blow me down! If you look very closely you can see some fuzziness from t' scanned images, but on t' whole they worked out very well. Begad! Last, shiver me timbers, I used some metallic blue Dupli-Color automotive spray paint for t' cockpit, and covered t' whole rocket with Krylon clear coat for a nice shine and t' protect t' decals.

Construction Rating: 4 out o' 5

Flight:
Interceptor has now flown six times, ya bilge rat, on B6-4 and C6-3 motors. Well, blow me down! She is a nice straight flier with less weathercockin' than might be expected.

Recovery:
T' only problem has been recovery when on three o' t' six flights t' shock cord caught on either t' win' pod or antenna resultin' in a tangled chute, me bucko, arrr, me hearties, however, ya bilge rat, thar was enough deployment and drag that she landed each time without damage.

Flight Rating: 3 out o' 5

Summary:
This is a fun, but basic futuristic scale rocket and one o' Estes classics that be nice t' 'return' t' me collection after a nearly 30 year hiatus. Ahoy! It really needs t' decals t' brin' out t' classic look. Aye aye! T' only con be t' recovery tanglin' problem. Arrr! Ahoy! Shortenin' t' shock cord might help, arrr, matey, but possibly at t' cost o' dented body tubes or zippers. But since none o' t' tangled recoveries has resulted in damage, matey, me bucko, I'm nay goin' t' worry about. All in all, ya bilge rat, it be nice use o' those leftover parts.

Overall Rating: 4 out o' 5

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