Clone - Estes Sentinel {Scratch}

Clone Estes Sentinel Clone

Clone - Estes Sentinel {Scratch}

Contributed by Bill Eichelberger

Construction Rating:
Flight Rating:
Overall Rating:

Published:	2012-05-21
Manufacturer:	Clone

Brief

T' Sentinel is a very convincin' faux-missile produced by Estes from 1988 t' 1994. Originally an 18mm bird, me hearties, I built me clone with a 24mm mount, a decision that I've been quite happy with. Mine isn't a kit, shiver me timbers, but a clone built around an original PNC-60RL nose cone.

Components

PNC-60RL nose cone
18" BT-60 body tube
BT-50 motor tube
5060 centerin' rings (2)
2050 engine block
Long Estes motor hook
36" length o' 150# Keelhaul®©™ shock cord
36" length o' 1/8" sewin' elastic shock cord
3/32" balsa fin stock
medium snap swivel (2)
18" parachute (reefed)
launch lug

Construction

Even with double t' fins o' a traditional 4fnc project, t' Sentinel isn't a lot more difficult as long as you take care t' keep t' fins and strakes straight. I attached t' bottom fin first usin' Elmer's wood glue, me bucko, then attached t' strake directly above t' fin. From thar I went t' t' opposite side and worked with that fin and strake, me hearties, shiver me timbers, keepin' t' fin in a straight line with t' opposite fin, matey, ya bilge rat, and t' strake straight with t' fin. I repeated t' process with t' other two sets and it turned out pretty well.

Finishing

T' biggest pro with finishin' this bird be t' fact that except for a thin silver area around t' top 1/8" o' t' body tube, me bucko, this is an all white rocket. As I generally do with most o' me builds, matey, I sprayed t' rocket with a coat o' Valspar primer before beginnin' t' sealin' and sanding. After priming, I sealed t' body tube and fins with two coats o' thinned Elmer's Fill & Finish, sandin' betwixt each coat. After another coat o' primer I sprayed t' whole rocket with Valspar gloss white, arrr, then masked off t' very top o' t' body tube for t' silver accent. (Which is a really nice touch, arrr, btw.) I picked up a set o' decals from Excelsior and be incredibly impressed with t' finished look they gave t' t' rocket. Craftsmanship issues aside, arrr, matey, this was one o' t' sharpest lookin' birds I've finished in a long time.

Then came t' clear coat.

I wanted t' protect t' decals, so I picked up a can o' Valspar Clear Acrylic. T' white paint had been applied several weeks before, so it should have had plenty o' time t' dry, but when I sprayed on t' clear, shiver me timbers, t' paint immediately crazed in several spots. It's nay fatal, but it sure takes away from that feelin' o' accomplishment I had when I wrote t' previous paragraph.

Construction Score: 5

Flight

First flight was on an Estes D12-5 at what was then t' QUARK home field, ya bilge rat, shiver me timbers, Voice o' America Park. With a field of this size I had no qualms about goin' with t' D12 for t' first flight. T' flight was arrow straight and plenty high with no curve into the light breeze. Recovery was somethin' o' a walk, me bucko, but t' reefed chute brought it down fairly smartly into t' weeds off o' t' flight line. Somehow I managed t' wind up with somethin' o' an Estes dent at t' top o' t' body tube. Like t' clearcoat crazing, nay a deal breaker, but still an annoyance.

For t' second flight a month later, me bucko, I decided t' go with an Estes E9-6. VOA was a great field for these long burnin' E motors, and in similar conditions t' t' D12 flight, t' E9 turned in a similar performance. High and dead straight with a nice hike into t' weeds. This time thar be no damage on recovery.

T' third flight was again on a D12, this time with a 7 second delay. T' extra two seconds might have been a bad idea because after a picture perfect flight, I arrived at t' landin' area to find that t' Keelhaul®©™ had cut through one o' t' fins on recovery, arrr, slicin' through t' glue fillet for 2/3 of t' length o' t' fin root. Repair was simple, shiver me timbers, but t' results were noticeable.

Flight Rating: 5

Summary

Pros: Despite t' mostly white paint scheme, this is a great lookin' rocket when completed. Decals from Excelsior really set t' whole scheme off. Performance with the 24mm engine is a huge improvement for large fields.

Cons: None, arrr, except that it's out o' production.

Overall Rating: 5