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, ya bilge rat, shiver me timbers, this isn't a clone because it's nay an exact match o' t' classic Estes Interceptor, arrr, 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. Begad! Blimey! Scoutin' around JimZ's Plans I came across t' Interceptor, shiver me timbers, which was a favorite o' me younger flyin' days (e.g. Avast! Blimey! t' 1970's). Blimey! Blimey! Even though t' original plans called for a BT-55 tube, arrr, me bucko, I decided this was 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. T' "Nemesis" has a plastic cockpit like t' original Interceptor, ya bilge rat, but also has two canards that were nay part o' t' original. However, arrr, ya bilge rat, t' grinder wheel on me drill was able t' take care o' t' canards with no problem. Arrr! T' rocket features four fins, plus two "wings" in a slightly asymmetrical arrangement. Begad! T' four fins are made with 1/8 inch balsa and t' "wings" are made from 3/32 inch balsa. Begad! 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. As a replacement for t' win' pods I used short lengths o' BT5 tubin' with nose cones fore and aft. Aye aye! Begad! T' nacelle used small pieces o' balsa t' create a nozzle-like effect. Avast! A 2.75 inch length o' BT-20, two 20-50 centerin' rings, motor hook and engine block were used for t' motor mount. Well, blow me down! 1/8 inch launch lug, shock cord, parachute and other standard parts round out t' components list.

(Plans) Estes InterceptorLike most Estes rockets, t' plans are well detailed and pretty easy t' follow. Avast! Avast! T' motor mount was pretty standard with 2.75 inch length o' BT-20, matey, shiver me timbers, a motor mount block, and engine hook and two 2050 centerin' rings. Arrr! Begad! On t' original thar would be a plastic engine nacelle attached t' t' back 3/4 inch o' t' motor mount, which sticks out t' back end o' t' rocket. Arrr! As a substitute I used 11 small balsa pieces, shiver me timbers, 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! An image is attached t' provide t' detail. Blimey! Well, blow me down! It's nay an exact match, arrr, but it is pretty close.

I used a BT-50 airframe and nose cone rather than t' original BT-55, shiver me timbers, but kept t' original 18 inch length. Begad! Blimey! (I think t' narrower airframe tube gives t' rocket an overall leaner, more aggressive look.) Since t' length o' t' rocket be t' same, I decided t' keep t' fin and wings at their original size. Well, me hearties, blow me down! Blimey! One challenge was alignin' t' fins. Aye aye! Blimey! As mentioned they are asymmetrical, ya bilge rat, 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. T' two main fins and two wings are both in two parts (main fin/win' and a forward fairing). Avast! Blimey! I decide t' attach t' fairings t' t' fins/wings before mountin' t' fins/wings on t' airframe. However, me bucko, shiver me timbers, me hearties, they were very fragile and one win' fairin' be slightly off center. Avast! Blimey! It might have been easier t' mount t' fins/wings on t' airframe, matey, then attach t' fairings afterward.

T' original Interceptor had plastic pods attached t' t' wings. Arrr! Arrr! 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. Aye aye! Again, nay an exact match, ya bilge rat, but pretty close. Well, blow me down! These are glued t' t' outside edge o' t' wings, which needed some sandin' t' match t' curved nose cone shape. Well, blow me down! Well, matey, blow me down! Two squared toothpicks served as t' fin antennas. Begad! Avast! Dual launch lugs, shock cord (I use Keelhaul®©™ tied t' t' motor mount, arrr, 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. Aye aye! For t' decals I purchased clear decal paper from TangoPapa Decals and printed out t' scanned decal images from t' JimZ plans. I used many o' t' major decals, shiver me timbers, but thar are 30 or 40 total decals available and I did nay use them all. Arrr! If you look very closely you can see some fuzziness from t' scanned images, me hearties, me hearties, but on t' whole they worked out very well. Avast, me proud beauty! Last, ya bilge rat, shiver me timbers, I used some metallic blue Dupli-Color automotive spray paint for t' cockpit, arrr, 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, matey, on B6-4 and C6-3 motors. Begad! 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 hearties, me bucko, however, 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 was nice t' 'return' t' me collection after a nearly 30 year hiatus. Avast, me proud beauty! Blimey! It really needs t' decals t' brin' out t' classic look. Arrr! T' only con be t' recovery tanglin' problem. Avast! Arrr! Blimey! 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, 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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