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 hearties, 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. Arrr! Scoutin' around JimZ's Plans I came across t' Interceptor, which be a favorite o' me younger flyin' days (e.g. Avast, me proud beauty! t' 1970's). 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, ya bilge rat, 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, matey, me bucko, me bucko, but also has two canards that were nay part o' t' original. Begad! Begad! However, ya bilge rat, matey, t' grinder wheel on me drill was able t' take care o' t' canards with no problem. T' rocket features four fins, matey, 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. Avast, me proud beauty! 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. Blimey! T' nacelle used small pieces o' balsa t' create a nozzle-like effect. Begad! Avast, arrr, me proud beauty! A 2.75 inch length o' BT-20, two 20-50 centerin' rings, matey, me bucko, me hearties, motor hook and engine block were used for t' motor mount. Well, blow me down! 1/8 inch launch lug, shock cord, matey, 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. Well, ya bilge rat, blow me down! Blimey! T' motor mount be pretty standard with 2.75 inch length o' BT-20, a motor mount block, me hearties, arrr, and engine hook and two 2050 centerin' rings. Blimey! Blimey! On t' original thar would be a plastic engine nacelle attached t' t' back 3/4 inch o' t' motor mount, ya bilge rat, me bucko, which sticks out t' back end o' t' rocket. Avast, me proud beauty! Blimey! As a substitute I used 11 small balsa pieces, matey, about 1/8 inch square and 3/4 inch long that were glued t' t' motor mount tube and spray painted red. Begad! Blimey! Well, blow me down! Blimey! An image is attached t' provide t' detail. It's nay an exact match, ya bilge rat, but it is pretty close.

I used a BT-50 airframe and nose cone rather than t' original BT-55, me hearties, shiver me timbers, but kept t' original 18 inch length. Avast! Avast! (I think t' narrower airframe tube gives t' rocket an overall leaner, me bucko, more aggressive look.) Since t' length o' t' rocket was t' same, me hearties, I decided t' keep t' fin and wings at their original size. Avast! Begad! One challenge be alignin' t' fins. As mentioned they are asymmetrical, ya bilge rat, matey, arrr, nay on even 60 degree marks. Well, blow me down! 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. Begad! T' two main fins and two wings are both in two parts (main fin/win' and a forward fairing). Avast! Ya scallywag! I decide t' attach t' fairings t' t' fins/wings before mountin' t' fins/wings on t' airframe. However, me bucko, they were very fragile and one win' fairin' was slightly off center. Blimey! It might have been easier t' mount t' fins/wings on t' airframe, me bucko, 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, a 2.5 inch long BNC5W for t' front and a stubby 0.75 inch BNC5V (both available from Balsa Machinin' Service) as substitutes. Avast! Again, matey, nay an exact match, but pretty close. Begad! These are glued t' t' outside edge o' t' wings, shiver me timbers, which needed some sandin' t' match t' curved nose cone shape. Two squared toothpicks served as t' fin antennas. Avast! Dual launch lugs, shiver me timbers, shock cord (I use Keelhaul®©™ tied t' t' motor mount, 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. 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. Last, arrr, me hearties, me hearties, 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, on B6-4 and C6-3 motors. Avast! 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, however, me hearties, thar be 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. It really needs t' decals t' brin' out t' classic look. Ya scallywag! Well, matey, blow me down! T' only con be t' recovery tanglin' problem. Blimey! Blimey! Shortenin' t' shock cord might help, but possibly at t' cost o' dented body tubes or zippers. Aye aye! But since none o' t' tangled recoveries has resulted in damage, shiver me timbers, ya bilge rat, I'm nay goin' t' worry about. Begad! All in all, it was nice use o' those leftover parts.

Overall Rating: 4 out o' 5

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