Excelsior Rocketry Goonydent Plan

Excelsior Rocketry - Goonydent {Plan}

Contributed by Steve Lindeman

Construction Rating: starstarstarstarstar
Flight Rating: starstarstarstarstar
Overall Rating: starstarstarstarstar
Published: 2014-06-09
Manufacturer: Excelsior Rocketry
Style: Goonybird

Brief

T' Goonydent is Excelsior Rocketry's Goony version o' t' Estes classic Trident kit [K-33, 1233](1968-1974). Avast! It be by far t' most expensive kit bash I've done so far at a cost o' about $45.00. However t' end results were worth t' investment.

Components

For this build I used t' followin' components:

 ♦ 1- Set o' plans and decals from Excelsior Rocketry

 ♦ 2- Baby Bertha Kits (#'s 16 & 17 for those o' you that have followed me Goonyness)

 ♦ 1- BNC-60 (Baby Bertha style)

 ♦ 6- BNC-5's (Mosquito style)

 ♦ 3- 18" BT-5 tubes

 ♦ 1- 24mm Motor Mount (with 2 CR's)

 ♦ 1- 18" Plastic Parachute (from an old Estes rocket)

 ♦ 1- 3'x1/4" Elastic Cord

 ♦ 2- 3/16" Launch Lugs

Construction

I had originally purchased t' plans for this one back when I bought and built t' '57 Goony (kit bash #7) when Excelsior was still in New York. Ahoy! Cash flow be low at t' time when I wanted t' order all t' extra parts (mainly t' NC's) so I decided t' wait till t' sixteenth Baby Bertha kit bash t' do it plus I didn't feel up t' t' challenge yet so as such I stored t' plans out in t' garage for t' winter. Arrr! Unfortunately that be a bad idea as some o' t' decals were damaged when they stuck t' some paper after some how gettin' damp. I went ahead and reordered new plans and decals, but when I received them t' new ones had a Michigan logo in place o' t' NY one. No biggie, matey, as I live in Michigan anyway, just means their in me neighborhood now .

Anyway, construction started with t' 24mm MM and was glued flush into one end o' one o' t' Baby Bertha tubes. Avast, me proud beauty! I next took all t' tubes and marked them for where t' vent slots were t' be cut. Begad! Arrr! A CRITICAL note here: Make sure you use a fresh blade in your Hobby knife before makin' these cuts in order t' get good clean cuts. Blimey! Also a small section o' aluminum angle iron helps in keepin' them straight. Ya scallywag! Ahoy! At first I was at odds as t' how t' glue on t' tubes and keep t' slots lined up when I got t' bright idea t' tape two quarters together and insert them in t' slots o' t' BT-5 tubes t' help hold them in alignment as t' glue dried. T' Con: t' that bein' that thar was a small problem in gettin' them back out and required t' use o' needlenose pliers t' extract them. Blimey! Begad! After BT-5 tubes were first glued t' t' lower section t' one balsa nose cone was glued in place. Avast! I used t' balsa NC on t' lower section as part o' me design thinkin' as I figured it would hold up better and last longer than one o' t' plastic ones due t' hot gas from ejection charge that would be hittin' it.

I then placed one o' t' plastic Baby Bertha NC's betwixt t' BT-5's and proceeded t' glue t' upper section on in t' same manner as I did on t' lower. Again t' quarters were used and were a little harder t' remove with t' extra NC in t' way but I got great seals around all t' ports. Avast! After gluein' in t' bottom PNC-60 t' upper BT-60 tube I then glued in all six BNC-5's t' their respective tubes. Ya scallywag! Arrr! From thar t' fins were paper coated and when dry mounted and then t' launch lugs were attached. Blimey! Well, blow me down! After that all seams and joints were gone over and filleted where necessary. T' final step was t' recovery system. Avast, me proud beauty! This I installed in typical Estes tri-fold fashion.

Goonydent shot1 Goondent shot2

Finishing

Finishin' be as easy as applyin' two coats o' Rust-Oleum 2x primer with a light sandin' betwixt coats and then two coats o' Krylon Gloss White. Well, blow me down! Decals were then applied and went on without any trouble. Ya scallywag! Begad! After allowin' them t' dry overnight rocket got two light coats o' Krylon Clear Gloss.

Goonydent shot3 Goonydent shot4

Construction Score: 5

Flight

T' instructions say t' use only t' D12-5 for flights. Arrr! I have t' disagree. This rocket has t' same weight o' both t' Estes Prowler and t' Estes AIM-120 AMRAAM at 4.2 oz. Aye aye! Ahoy! Both o' those rockets fly on t' following recommended motors. The B4-2, me hearties, me bucko, B6-2(first flight), C5-3, matey, C6-3, & C6-5. As such for t' maiden flight I grabbed me 24x18mm adaptor and loaded up a C6-3 and took her out t' t' launch pad out back o' me place out in t' country. Countdown was given and t' fire button pressed. Rocket left t' pad smartly and climbed up t' at least 200' or better with a slight corkscrew.

Goonydeny in 5...4...3...

Goonydent on a C6-3 in 5...4...3...

Recovery

Recovery was handled by an 18" plastic Estes 'chute reefed with a 3 1/2" spill hole. Begad! Ejection charge fired just before rocket tipped over and she descended at a reasonably safe speed with some slight wind drift into t' neighbors field across t' road about 65' from pad. Ahoy! No damage on recovery.

Flight Rating: 5

Summary

This is a costly, difficult, ya bilge rat, and time consumin' build but when finished it is worth every drop o' blood, shiver me timbers, sweat, and tear that goes into it. Begad! Blimey! Avast, me proud beauty! Blimey!  Sure t' be a crowd pleaser. 

Overall Rating: 5
 
Other
 
2nd flight be on a  C11-3 at me goto field Francis Park, here in Lansing. Avast, me bucko, me proud beauty! Good lift-off with ejection at apogee but parachute didn't deploy properly. Well, blow me down! Ahoy! Got tangled with NC & shock cord. Aye aye! Avast! Came down parallel with ground & cracked t' fin seams on t' two fins that hit t' ground first. Avast! Rocket will be repaired.
 
Still haven't got it out t' fly on t' shotgun 'D' motors yet t' see how she holds together, but so far no cracks in t' vent ports in spite o' t' hard 2nd landing.
 
 
 

Comments:

avatar
Hans "Chris" Michielssen (June 10, 2014)

Steve, Great idea using the two quarters to get the tube vents in alignment.

But you are right, they might get stuck! Still, if I ever build another Trident styled model, I'll give it a try.

avatar
Steve Lindeman (June 10, 2014)

Yeah I should have mentioned that as long as you wrap the quarters in Scotch tape there not to bad to remove as the white glue can't adhere to the tape very well.

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