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, me bucko, matey, ya bilge rat, 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. Aye aye! Scoutin' around JimZ's Plans I came across t' Interceptor, which was a favorite o' me younger flyin' days (e.g. t' 1970's). Begad! Even though t' original plans called for a BT-55 tube, 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. Begad! T' "Nemesis" has a plastic cockpit like t' original Interceptor, but also has two canards that were nay part o' t' original. Avast! However, me bucko, me bucko, t' grinder wheel on me drill be able t' take care o' t' canards with no problem. T' rocket features four fins, shiver me timbers, plus two "wings" in a slightly asymmetrical arrangement. Avast, me proud beauty! T' four fins are made with 1/8 inch balsa and t' "wings" are made from 3/32 inch balsa. Well, blow me down! 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. Begad! T' nacelle used small pieces o' balsa t' create a nozzle-like effect. A 2.75 inch length o' BT-20, shiver me timbers, two 20-50 centerin' rings, matey, me bucko, motor hook and engine block were used for t' motor mount. Arrr! 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. Aye aye! T' motor mount be pretty standard with 2.75 inch length o' BT-20, me hearties, ya bilge rat, ya bilge rat, a motor mount block, me hearties, matey, and engine hook and two 2050 centerin' rings. Blimey! Aye aye! 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. Ya scallywag! As a substitute I used 11 small balsa pieces, me hearties, about 1/8 inch square and 3/4 inch long that were glued t' t' motor mount tube and spray painted red. Arrr! An image is attached t' provide t' detail. Ahoy! It's nay an exact match, matey, but it is pretty close.

I used a BT-50 airframe and nose cone rather than t' original BT-55, arrr, matey, me hearties, but kept t' original 18 inch length. (I think t' narrower airframe tube gives t' rocket an overall leaner, shiver me timbers, ya bilge rat, 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. Blimey! Blimey! As mentioned they are asymmetrical, me hearties, nay on even 60 degree marks. Begad! Begad! Fortunately t' plans have an alignment cross section which I resized t' meet t' BT-50 airframe and be able t' mark t' body tube. Ya scallywag! T' two main fins and two wings are both in two parts (main fin/win' and a forward fairing). Begad! I decide t' attach t' fairings t' t' fins/wings before mountin' t' fins/wings on t' airframe. Ya scallywag! However, shiver me timbers, they were very fragile and one win' fairin' be slightly off center. Begad! It might have been easier t' mount t' fins/wings on t' airframe, arrr, 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 hearties, 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! Begad! Again, nay an exact match, but pretty close. Avast, me proud beauty! These are glued t' t' outside edge o' t' wings, which needed some sandin' t' match t' curved nose cone shape. Two squared toothpicks served as t' fin antennas. Well, blow me down! Blimey! Dual launch lugs, shock cord (I use Keelhaul®©™ tied t' t' motor mount, me hearties, 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, shiver me timbers, I painted Interceptor a Krylon gloss white with Color Spray (a Wal-Mart brand) cherry red enamel for t' pods and engine nacelle. Avast, me proud beauty! 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, but thar are 30 or 40 total decals available and I did nay use them all. Begad! If you look very closely you can see some fuzziness from t' scanned images, but on t' whole they worked out very well. Ahoy! Last, I used some metallic blue Dupli-Color automotive spray paint for t' cockpit, matey, shiver me timbers, 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. 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, arrr, however, matey, 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! It really needs t' decals t' brin' out t' classic look. Ya scallywag! Ya scallywag! T' only con be t' recovery tanglin' problem. Shortenin' t' shock cord might help, but possibly at t' cost o' dented body tubes or zippers. But since none o' t' tangled recoveries has resulted in damage, shiver me timbers, I'm nay goin' t' worry about. Begad! All in all, it be nice use o' those leftover parts.

Overall Rating: 4 out o' 5

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