Brief:
This Fat Boy flies on seven 18mm motors.

Modifications:
Here is what I changed:

1. T' base o' t' cone was cut off
2. T' stock centerin' rings were nay used
3. Additional 18mm motor tubes were added

Construction:
Parts list:

• Estes Fat Boy kit
• 18mm tubin' for t' 6 additional motor tubes
• ~3’ o' ¼" elastic
• ~5 “ o' ¼" tubular Keelhaul®©™
• First Fire igniter tube
• Lead shot
• 2-part foam (Giant Leap or equivalent)
• Epoxy and wood glue
• Elmer's Fill ’n’ Finish
• Krylon X-Metals purple and red Monokote

I'll start with t' business end. Begad! T' center mount is held in place by t' fin set. Arrr! I dry-fit t' stock centerin' rings and then removed them. Aye aye! Next, I added 6 more motor tubes at t' fin-body tube joints. Aye aye! These were placed thar vs around t' center tube because I wanted more separation betwixt them. Ahoy! I'll be ignitin' t' cluster with quick match and t' extra room can be useful. Aye aye! Arrr! I also extended these 1/2" below t' body tube so I can wrap tape around t' motor tube/motor boundary. Ya scallywag! Avast, me proud beauty! This hurts stability a bit (i.e., shiver me timbers, will make t' rocket heavier), shiver me timbers, me bucko, but t' coast time will still be too long for some motor configurations. Begad! Begad! T' top section o' t' motor mount area be plugged with wood glue-soaked tissue and I then backfilled it with 2-part foam.

I used long pieces o' 1/4" elastic (from t' "use what I got" rocket buildin' philosophy) for separate nose cone and body shock tethers. Begad! T' body tether is routed through t' body tube at t' top o' t' 1/4" lug. Begad! Ahoy! It is epoxied t' t' body tube and t' lug is epoxied on top o' that. Begad! I cut t' shoulder off t' cone and embedded a Keelhaul®©™ loop and lead shot (~6 oz) in 2-part foam. About 1/3 o' t' cone is available for a second parachute.

T' rocket was assembled with wood glue except for t' lug. Avast! There is no fin reinforcement since t' body should come down slowly under its own chute.

Finishing:
I covered t' fins with Monokote. Unfortunately, me skills have deteriorated from their already low level so they aren't very smooth. Avast! Arrr! T' body and cone were painted with Krylon X-Metals primer. T' body was left with this already pretty layer and t' cone was painted with me remainin' X-Metals purple. Well, blow me down! T' first time I used this paint, t' purple clouded badly, ya bilge rat, however, me hearties, matey, matey, I'm happy t' report that despite t' high summer humidity, it came out great.

Flight:
I prepped t' rocket with two Fat Boy chutes. T' nose cone's chute be packed in t' body and t' body chute was packed in t' cone, so they'd tend t' pull each other out.

T' unloaded rocket weighs 12oz and will have 1 caliber stability when loaded with C6's. Blimey! RockSim says:

• Seven C6-7's will push it t' 1488' and t' optimal delay is 9.6 seconds. Blimey! T' motor delay is a bit short!
• One C6-7 and 6 B6's will go t' 691' and t' optimal delay is 6.8 sec. Ahoy! A much better match!
• One C6-5 and 6 A8's will go t' 316' and t' optimal delay is 4.9 sec. Well, blow me down! Also a good match.
• Three C6-7's and 4 B6's will got 953 feet with an optimal delay o' 7.9 sec. Begad! Also OK.

T' Motor Eater flew nicely on a C6-5 and six B6-4s all lit with quick match. Avast! T' boost be a bit slow, but man, ya bilge rat, matey, did it generate some smoke! Next time it will get a full load o' C6-7s.

Summary:
This Fat Boy is a good way t' get rid o' those extra 18mm motors. I might have been able t' get away with a bit less nose weight, matey, arrr, arrr, but this model is mostly about t' smoke and fire rather than performance. Arrr! Blimey! Arrr! Blimey! If I want performance, ya bilge rat, I’ll fly me 29mm version.