Fat Boys on D12's

Fat Boys on D12's

Post by Steve » Fri, 24 Oct 1997 04:00:00



Just picked up an Estes Fat Boy during the Michaels sale. Looks like it would
be a fun rocket on D12-5/D12-7. Just wondering if anyone else has modified
construction to handle D12's and what the launch was like.

ST. --------- BAR June 97. After 28 years. --------------- 8-)

 
 
 

Fat Boys on D12's

Post by Bob Kapl » Sat, 25 Oct 1997 04:00:00


Quote:

> Just picked up an Estes Fat Boy during the Michaels sale. Looks like it would
> be a fun rocket on D12-5/D12-7. Just wondering if anyone else has modified
> construction to handle D12's and what the launch was like.

I've seen it done, and it may take a bit of nose weight.

I chose to build mine stock, and use D13 reloads instead of D12s. I added a
bit of lead to the nose to keep the loaded CG where it was with a C6.

        Bob Kaplow      NAR # 18L       TRA # "Abort, Retry, Fail?"

 
 
 

Fat Boys on D12's

Post by The Silent Observe » Sat, 25 Oct 1997 04:00:00


Quote:

> Just picked up an Estes Fat Boy during the Michaels sale. Looks like it would
> be a fun rocket on D12-5/D12-7. Just wondering if anyone else has modified
> construction to handle D12's and what the launch was like.

The Fat Boy flies just fine on a B6-2 or C6-3, but it flies even better
on a D12-5, and better still on an E15-7...  B)

You may need to add a half ounce to an ounce of nose weight to keep the
same margin of stability with the heavier motor, or you could convert it
to six fins like I did with my Fat Fat Boy...

--
There are times when even the Weaver of Skeins can make an awful tangle
of a perfectly simple tapestry.  -- M. A. R. Barker, _The Man of Gold_

Donald Qualls, aka The Silent Observer           NAR # 70141-SR Insured
Rocket Pages             http://members.aol.com/silntobsvr/launches.htm

Opinions expressed are my own -- take them for what they're worth
and don't expect them to be perfect.

 
 
 

Fat Boys on D12's

Post by Jon38 » Sat, 25 Oct 1997 04:00:00



Quote:
>I added a 24mm mount, G-10 fins, and appropriate nose weight to mine and
>fly it regularly on F24 reloads.  Does about 1000 feet.  It's neat to see
>the flame longer than the rocket.  Am working on a 29mm version now.  Think
>I better use a G40 and not a G64, don't want to lose my casing. :)

>Randy Brust
>NAR68770 L1

I also added a 24mm mount, as well as a Fat Boy booster with 4 18mm mounts.
 Flown it twice now, with eyeballed altitudes to around 1500-2000 feet.  Only
 needed about 1-1.5 oz of nose weight.

John O'Donnell  NAR# 60742  CSAR Sec.#113
                        TRA# 3274   TRIPOLI MID-OHIO

If at first you don't succeed, try a little more epoxy.

 
 
 

Fat Boys on D12's

Post by RCBrust » Sat, 25 Oct 1997 04:00:00


I added a 24mm mount, G-10 fins, and appropriate nose weight to mine and
fly it regularly on F24 reloads.  Does about 1000 feet.  It's neat to see
the flame longer than the rocket.  Am working on a 29mm version now.  Think
I better use a G40 and not a G64, don't want to lose my casing. :)

Randy Brust
NAR68770 L1

 
 
 

Fat Boys on D12's

Post by Mats Svenss » Mon, 27 Oct 1997 03:00:00



Just built my FatBoy with the stock 18mm mount last week. I took it out
to the field today and launched it on a B6-2. This rocket definitely
needs bigger motors.

// MS "My next FatBoy will fly on a G motor"


http://www.efd.lth.se/~d92ms
http://www.efd.lth.se/~d92ms/rocketpages/rockethome.html
?llingav?gen 7, B:513
227 34 Lund, Sweden

 
 
 

Fat Boys on D12's

Post by Mats Svenss » Mon, 27 Oct 1997 03:00:00


Forgot something in the last post:

Just talked to Tripoli Sweden prefect Rolf Orell yesterday. He was
happy as a little kid to announce that he had found out that this cute
little rocket could take the shorter 38 mm "I" RMS casings. Now that's
gonna be a sight on the next Tripoli Sweden launch... The supersonic
FatBoy. :-)

// MS "My next FatBoy will fly on a G motor"


http://www.efd.lth.se/~d92ms
http://www.efd.lth.se/~d92ms/rocketpages/rockethome.html
?llingav?gen 7, B:513
227 34 Lund, Sweden

 
 
 

Fat Boys on D12's

Post by RSchut32 » Wed, 29 Oct 1997 04:00:00


Greetings.  Live long and Fly many Rockets!

Sounds like this is one of the fav's to modify.  I plan on putting a 24mm mount
 in it and rear ejection.  How much do you think having all the recovery stuff
 in the back will afect the CG?  Should be cool though to see this one FLY!


NAR# 59394 LD

 
 
 

Fat Boys on D12's

Post by John Rit » Fri, 31 Oct 1997 04:00:00


Quote:

> Forgot something in the last post:

> Just talked to Tripoli Sweden prefect Rolf Orell yesterday. He was
> happy as a little kid to announce that he had found out that this cute
> little rocket could take the shorter 38 mm "I" RMS casings. Now that's
> gonna be a sight on the next Tripoli Sweden launch... The supersonic
> FatBoy. :-)

> // MS "My next FatBoy will fly on a G motor"


> http://www.efd.lth.se/~d92ms
> http://www.efd.lth.se/~d92ms/rocketpages/rockethome.html
> ?llingav?gen 7, B:513
> 227 34 Lund, Sweden

I was wondering if he found that out from one of our members in
our club, Andy Schecter. He too built a FAT BOY with a 38mm mount
and it has flown successfully on an I161W and H242T with good
recovery. I would be very careful with supersonic attempts on this
puppy, because of the shape of the nosecone it might create some
unstable aerodynamic effects (for loss of a better word) in the
transonic region. It's been one of the wild things in this club
to use the original Estes kits, modify them and fly them on higher
impulse motors, some of them with more thrust to weight ratio than
Estes ever could imagine. My favorite is to glass the Estes Maniac
and fly it on : Vulcan H100SS, Vulcan G200, Aerotech H124J, G55W,
G110T and maybe some day a KOSDON H365F. I am currently working on
a 3 times upscale with a 54mm mount. One of our members, Andy Schecter
just built a flew a 5.41 times upscale of the FAT BOY on an M1419W !!
Yes, you herad it right, the bodytube is 14" diameter and the FAT BOY
weighed in at about 50 lbs !! It went 3800 ft ! In case you haven't
already seen it, check out :
http://128.230.82.205/RocketPics/oct97/index.html

THX, John

 
 
 

Fat Boys on D12's

Post by WillCarn » Fri, 21 Nov 1997 04:00:00


Quote:
>Just picked up an Estes Fat Boy during the Michaels sale. Looks like it would
>be a fun rocket on D12-5/D12-7. Just wondering if anyone else has modified
>construction to handle D12's and what the launch was like.

I just finished two fat boys.  One with the standard B-C mount
and the other one I used the BT-80 tube adapters to take the
D tube size BT-50 tube as the motor mount.  I also added some
balsa strips inside as stiffiners in addition to the original thru the
tube fins.  Can't wait to fly them.

By the way, I took a Smiley face bean bag with arms and legs,
attached a parachute to it for a "Bail out" of one of these.
This of course will change CG so I might have to add more
weight just for the bail out figure.  Anyone else done this
type of bail out.  The figure is about two inches wide by
three or so inches long and does weigh a little.
William
**************************************************
It's not what you got, it's what you do with it.
Try helping other's instead of hurting them.
Quote "I before You, She before Me", light'n
up.
**************************************************

 
 
 

Fat Boys on D12's

Post by Doug » Fri, 21 Nov 1997 04:00:00


Quote:

> Team Gilmore likes to fly Fat Boys, we even have a team member that
> looks like... er, never mind.  

Hey, I resemble that remark!

Quote:
> We've gone through a number of these.

Speak for yourself, I still have my original one...well, sorta.  It
looks almost as bad as the rocket the dog chewed, but it can still fly.

Quote:
> We fly them on everything from D12's to F39's.  

To F25's!!!  For a 29mm model, just add two CR2.56-1.14's, a 29mm MMT,
3/32" plywwood or 1/32" G-10 fins, and 3 ounces of nose weight.  Come to
think of it, the only thing that's stock on mine is the nose cone, the
BT and the decal!

Quote:
> Some of us have better luck than others in retreiving them. <G>

My motto:  it's easier to find in the middle of the road, than in the
top of a tree guarded by a 10-foor gator!  

Doug Gilmore
TRA# "who cares"
Husband, Beer Taster, German Shepherd Owner, Kitbasher, Big Mosquito
Shredder <G>

 
 
 

Fat Boys on D12's

Post by WillCarn » Sat, 22 Nov 1997 04:00:00


Quote:

>> >Just picked up an Estes Fat Boy during the Michaels sale. Looks like it
>would
>> >be a fun rocket on D12-5/D12-7. Just wondering if anyone else has modified
>> >construction to handle D12's and what the launch was like.

Actually those are NOT my words.  That was a quote from a
praevious post that I made a reply to.  My words were not
shown above.  I just hate the miss-quote that happens when
some reply to posts.  But I suppose I have done the same thing.

My Fatboy is ready to fly on the D-12's as soon as the weather
improves.  Can't wait.    I did use some balsa strips between the
motor mounts to improve the rigididity of the mount.  These
were place on sides away from the fins to give more support
for the higher thrust motor.  I hope to also include the little
"Smile'n Jumper" bailout figure in this one.  It's a little bean-bag
Smiley face with hands and feet.  It looks pretty cute.

I am also putting finishing touches on a rocket I call "Silver
Streak".  It's painted silver and has a three or four foot long silver
Christmas streamer (with all the little silver strands).  It should look
good coming down.
**************************************************
It's not what you got, it's what you do with it.
Try helping other's instead of hurting them.
Quote "I before You, She before Me", light'n
up.
**************************************************

 
 
 

Fat Boys on D12's

Post by Ryan Woebkenbe » Sat, 22 Nov 1997 04:00:00



Quote:


>>> >Just picked up an Estes Fat Boy during the Michaels sale. Looks like it
>>would
>>> >be a fun rocket on D12-5/D12-7. Just wondering if anyone else has modified
>>> >construction to handle D12's and what the launch was like.

Just a little note about Chad Ring and the Fat Boy.....

Nah, too easy.

Chad flew his Fat Boy last weekend with an 18mm rms motor (D13,
I think).  He learned that this combo (and posslily a modified
24 mm Fat Boy) needs a bit of nose weight.  His went horizontal
(probably had nothing to do with the 45 degree launch angle,
but what do I know) and speared a tree!!!  Crazy fin flakes and
everything.

Oh, and the 45 degree thing was a joke, even Chad is not
*that* dangerous.

-- Ryan Woebkenberg

--------------------------------------------------------------------------

"Freedom is just another word for nuthin left to lose."          
--------------------------------------------------------------------------

 
 
 

Fat Boys on D12's

Post by Jackbear » Sun, 23 Nov 1997 04:00:00


I built mine with thorough fillets on the internals of the engine mount/fin
assembly, and extra shock cord to handle 2 ounces of nose weight, with an eye
to flying on an F39. It has been flown on a D12-5, nice straight flight,
deployed chute very near apogee, and is more "ballistic" than the stock Fat Boy
which decelerates quickly after burnout. You won't be able to get to a full
body diameter stability with this model; mine has about 2/3 max and I fly it
off a 4' rod with no problem.
Jack W. Kale, Jr. NAR #70384, Tripoli #5798

Timmy, you can't take it with you, so if you have a sandwich and your blue
jeans, chill. Your old man, Paul. (1st century, paraphrased)

 
 
 

Fat Boys on D12's

Post by WillCarn » Sun, 23 Nov 1997 04:00:00


Quote:
>praevious

My spelling was correct when I sent the note, but
sometimes AOL puts in characters that do not belong
there.  I do have proof of this type of problem.

Anyone out there know any possible causes?
**************************************************
It's not what you got, it's what you do with it.
Try helping other's instead of hurting them.
Quote "I before You, She before Me", light'n
up.
**************************************************