| Manufacturer: | Modification |
This project begun when I read several posts from rec.model.rockets on placin' a 24mm motor mount in a Fat Boy, normally a 18mm kit. Begad! I first looked at t' instructions and made a list o' what I needed t' do.
- Replace t' 18mm motor tube with a 24mm one
- Make bigger motor mount with modified centerin' rings (higher strength) and an engine block
- Remove some o' t' "through t' wall tab" on t' fins
- Add nose weight
- Possibly insert a baffle system t' eliminate wadding
I bored out t' centerin' rings with a drill t' accommodate t' 24mm tube (Estes Bt-50). I constructed t' motor tube by t' instructions but instead o' a 18mm tube I used a 5 1/2 inch 24mm tube. Arrr! Blimey! Avast, me proud beauty! Blimey! Also, I used a larger engine hook and an engine block made o' a heavy duty BT-50/BT-20 centerin' ring. Begad! Blimey! I changed t' engine hook t' accommodate t' larger engine. Well, blow me down! Blimey! After I glued t' first centerin' rin' in t' normal position (per instructions) with epoxy, arrr, I used small strips o' thin plywood t' reinforce t' rings. Avast! Blimey! These were on t' side o' t' centerin' rin' facin' t' front o' t' rocket. Aye aye! Blimey! Well, blow me down! Blimey! I repeated this step with a second rin' whose reinforcements were facin' t' front o' t' rocket and t' distance o' t' "through t' wall tab" o' a fin from t' first centerin' ring. Blimey! Blimey! Lookin' back, it would have been easier and probably stronger t' make a new rin' out o' aircraft plywood. Avast, ya bilge rat, me proud beauty! Blimey! Oh well. Begad! Blimey! Blimey! Blimey! Note t' 18mm conversion tube t' use smaller engines and t' reinforcements on t' centerin' rings:
T' balsa strips on t' side o' t' conversion tube were added because t' centerin' rin' be nay on t' inside o' t' tube. Blimey! Another mistake that could be corrected. T' shock cord be tied t' t' t' t' upper centerin' rin' for strength. Avast! T' rin' was then glued on. Aye aye! Well, ya bilge rat, blow me down! T' fin was used t' show t' appropriate distance betwixt t' rings. Aye aye! Steel wool and another green centerin' rin' were added t' t' motor tube. A small disk o' balsa with holes drilled into it was glued onto t' top o' t' motor tube t' make a baffle.
I shaved off some o' t' TTW fin mounts t' accommodate for t' larger motor mount tube. Arrr! Begad! Usin' epoxy, matey, I glued in t' fins. Arrr! They were reinforced with hot glue. I made a 12 inch nylon parachute t' attach t' t' nose. Ya scallywag! Blimey! I will add 1.5 ounces o' nose weight for stability.
All done!
Other Reviews
- Modification Fat Boy - 24mm By Colin Westgarth-Taylor
An Estes Fat Boy modified with a 24mm MMT for D and E motors. External dimensions are stock. These modifications change one of Estes best packaged kits into a true performer. Modifications: Construction sequence was pretty normal for a MPR capable rocket: forward CR epoxied to the MMT, shock cord mount epoxied to the MMT (two 1/32" holes were drilled in the front CR to tie the Kevlar cord ...
#Related Reviews
- 2 Fat By Geof Givens
Brief: After a spell of creative scratch rocket projects, all my fun ideas seemed to have dried up. Looking around the workshop, I smiled at good old Fat Boy: both my kids and my favorite rocket. He's always good for an exciting flight and safe recovery. Why not court disaster by trying to improve ...
- Excelsior Rocketry Der Fat Max By Bill Eichelberger
I always loved the versatility of the Estes Fat Boy, and over the years I bought quite a few of them for different projects, most of them of the Goony persuasion. When a fellow club member decide to move away from low power and offered one for sale from his stash, I jumped at the ...
- Fat Boy to AttaBoy Modification By Tad Scheeler
The ATTABOY is a boattailed FATBOY with 24mm upsized motor mount that can be flown in two different configurations--both with and without upper payload tube. Modifications: I was inspired by Michael Bade's " Big Bad V-2 Daddy ", Kevin Johnson's " OY!FATBOY ", and David Fergus' " Boattail FATBOY ...
- Modification 24mm Fat Boy By Morgan Hendry
This project began when I read several posts from rec.model.rockets on placing a 24mm motor mount in a Fat Boy, normally a 18mm kit. I first looked at the instructions and made a list of what I needed to do. Replace the 18mm motor tube with a 24mm one Make bigger motor mount with modified ...
- Modification Fat Boy - 24mm By Colin Westgarth-Taylor
An Estes Fat Boy modified with a 24mm MMT for D and E motors. External dimensions are stock. These modifications change one of Estes best packaged kits into a true performer. Modifications: Construction sequence was pretty normal for a MPR capable rocket: forward CR epoxied to the MMT, shock ...
- Modification Fat Boy - 29mm By Scott McLeod
An Estes FatBoy modified with a glassed body tube, 29mm MMT and G10 fins for F, G, and H motors. External dimensions are stock. Best "bang-for-buck" rocket that I ever built. Modifications: When glassing the tube, I used a long section of PML 2.6" coupler tube wrapped in greaseproof ...
- Modification Fat Boy to Schnoz By Larry Brand
The problem with overpowering a "stubby" design like the C-powered Estes Fat Boy with heavier engines is the CG dilemma -- the more power, the more nose weight is needed to keep the CG in limits, negating the Oomph you thought you were adding. I have modified Fat Boy for F-power with a ...
- Modification Super Baby Bertha By Kevin Johnson
Took a Fat Boy kit and added Big Bertha like fins to make a Super Baby Bertha. Modifications: NARHAMS held a Fat Boy theme sport launch this month, and I was looking for something different to do with my last Fat Boy kit. I had just finished repairing my Super Big Bertha when inspiration ...
- Modification Two-Stage Fat Boy By Kevin Johnson
Kit bashed two Fat Boys into one two-stage rocket. Modifications: After building the sustainer per the instructions, I started the booster by building the motor mount/center rings. Using the completed mount as a guide, I marked the aft end of the second BT and cut it down just in front of ...
- Scratch BoatTail Fat Boy By David Fergus
Brief: Modified BoatTail FatBoy with a D engine mount, sturdier construction throughout, and better fly-ability with a boat tail. The basic dimensions of a stock Fat Boy were maintained for both body length and fin shape and size. Modifications: Body Tube: Cut the main body tube 5 1/8 inch ...
- Scratch Fat Boy (7 x 18mm Motor Eater) By Dick Stafford
This Fat Boy flies on seven 18mm motors. Modifications: Here is what I changed: The base of the cone was cut off The stock centering rings were not used Additional 18mm motor tubes were added Parts list: Estes Fat Boy kit 18mm tubing for the 6 additional motor ...
- Scratch Fat-Ass-Tron Sprint By Jim Sekol
Fat-Ass-Tron Sprint The Fat-Ass-Tron Sprint: The F-A-T Sprint is a combination of the Estes Fat Boy, and the Astron Sprint. It was originally created to address one of the Fat Boy's inherent design flaws, that being ...
Related Products
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Flights
Date | Flyer | Rocket | Altitude |
|---|---|---|---|
2010-05-09 | Matt Gillard | Estes Fat Boy - 24mm | - |
2008-05-31 | Ray King | Estes Fat Boy - 24mm | - |
2008-05-31 | Ray King | Estes Fat Boy - 24mm | - |
2007-11-04 | Matt Gillard | Estes Fat Boy - 24mm | - |
2007-09-30 | Matt Gillard | Estes Fat Boy - 24mm | - |
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