What did you do rocket wise today?

The Rocketry Forum

Help Support The Rocketry Forum:

DavieRockets

Well-Known Member
Joined
Mar 31, 2011
Messages
461
Reaction score
8
Nice to see some Vermont rocketry happening.
It's too bad there is not a club closer to central Vermont, Barre, Montpelier area.
You should make the drive to our field in St. Albans one time this spring or summer. We have a 10,000 foot waiver and hundreds of acres of open farmland and fly all year long. Yes, there are a few rocket eating trees but they are rarely hungry. That said we have a resident arborist that can get anything down as I can attest to. :facepalm:

We had an excellent turnout today with both a Level 1 and Level 2 cert.
P1060539 (Large).JPG
Check back on the club website in a few days for today's launch report with photos. www.crmrc.org.
 

dave carver

Nam Myoho Renge Kyo
Joined
Jan 18, 2009
Messages
4,965
Reaction score
4
Calculated 0.7gr of BP for apogee test that you see here. All I heard was a "TICK". Tried 1 gram... tiny "POP" but no movement. Tried 1.25 grams and got a nice deployment. Yes, two 2-56 nylon shear pins on sustainer and another two on nose cone. For Main I calculated 0.38 grams and initially tried 1/2 gram.... NADA. Tried .75 gram......"TICK". Tried 1 Gram and got a decent deployment but not full extension. Frankly I was afraid to use more for fear of blowing a hole in the thin wall glass payload tube.

I flew the Blue Iguana for the first time today using 1.25 gr. for Apogee and 1 gram for Main as tested. Nice apogee deployment but no shear pin breakage on the nose, so no main chute. Good thing I used an 18" drogue at apogee! Sustainer landed more or less flat, nose cone with payload tube attached stuck in the frozen ground and then bounced out. THUNK! Sheared the thin wall nosecone clear off it's coupler but no other damage not even a scratch. It was only 30 degrees today. Wonder if the shear pins got cold-hardened. Next Time I use 1.25 grams and maybe only 1 shear pin. Again I can not believe how much powder is needed for a 2.6" diameter tube with an internal length of only 9.5" mostly filled with a chute and Kevlar.

View attachment 285645 View attachment 285646 View attachment 285647

1 shear pin is a bad idea. Causes uneven pressure and can "cock" the cone shoulder inside the tube.
 

Cl(VII)

Chris Bender, Lab Rat
TRF Sponsor
Joined
Feb 22, 2013
Messages
4,218
Reaction score
327
I sanded a rocket that has been in primer for close a year. This marked the first building I have done in over 3 months. On a related note, my garage rocket palace is complete once the ac man comes in the morning and does the final connections and charging of the ductless system I put in.
 

smapdiage9

Well-Known Member
Joined
Mar 14, 2009
Messages
418
Reaction score
1


Got it put together for TAP inspection at the launch today. Stickershock wrap should arrive this week, hopefully flying next month!
 

DavieRockets

Well-Known Member
Joined
Mar 31, 2011
Messages
461
Reaction score
8
Launched 4 rockets today at the CRMRC monthly launch in St. Albans VT.

Yellow Crayon on a CTI H175 Smokey Sam
P1060528 (Large).JPG

Going Postal on an Estes E9-6
P1060513 (Large).JPG

Mouse 38 on a AT F23 Fast Jack
P1060568 (Large).JPG

Blue Iguana on a CTI I345 White Thunder
P1060552b (Large).jpg
 

smugglervt

Vermont BAR
TRF Supporter
Joined
Jun 20, 2015
Messages
539
Reaction score
28
It was good to see such a nice turnout at yesterday's launch. Hope the trend continues.
 

TopRamen

SA-5
Joined
Aug 9, 2013
Messages
9,919
Reaction score
18
Started dry fitting some parts to make the booster lug ring on the tail cone of my SA-5.
I'm loving all of these transitions, and having to fit them.
I was on a roll, but I had to go out in the cold to soak this transition with CA, and then to sand it to precise dimensions, and now my arthritis and nerve damage in my right hand is bothering me, so I'm taking a coffee break.:caffeine:
Anyhow, dry fitting stuff is fun, and this is a unique arrangement, so I thought I'de share the pics' from my build thread of today's rocketry wise so far.:

SA-5 Schematic.jpg


Gammon More Transitions 2002-12-31 004.jpgGammon More Transitions 2002-12-31 003.jpgGammon More Transitions 2002-12-31 002.jpg
 
Last edited:

rharshberger

Well-Known Member
Joined
Oct 13, 2014
Messages
9,100
Reaction score
1,238
Location
Pasco, WA
Started dry fitting some parts to make the booster lug ring on the tail cone of my SA-5.
I'm loving all of these transitions, and having to fit them.
I was on a roll, but I had to go out in the cold to soak this transition with CA, and then to sand it to precise dimensions, and now my arthritis and nerve damage in my right hand is bothering me, so I'm taking a coffee break.:caffeine:
Anyhow, dry fitting stuff is fun, and this is a unique arrangement, so I thought I'de share the pics' from my build thread of today's rocketry wise so far.:

View attachment 285745


View attachment 285742View attachment 285743View attachment 285744
Its coming along nicely Top!
 

Cl(VII)

Chris Bender, Lab Rat
TRF Sponsor
Joined
Feb 22, 2013
Messages
4,218
Reaction score
327
Started dry fitting some parts to make the booster lug ring on the tail cone of my SA-5.
I'm loving all of these transitions, and having to fit them.
I was on a roll, but I had to go out in the cold to soak this transition with CA, and then to sand it to precise dimensions, and now my arthritis and nerve damage in my right hand is bothering me, so I'm taking a coffee break.:caffeine:
Anyhow, dry fitting stuff is fun, and this is a unique arrangement, so I thought I'de share the pics' from my build thread of today's rocketry wise so far.:

View attachment 285745



View attachment 285742View attachment 285743View attachment 285744
That is looking real clean, Top. This thing is going to be a masters class in paper transitions and multi tube construction till you are done.
 

SteveA63

Well-Known Member
Joined
Dec 28, 2015
Messages
63
Reaction score
0
That is looking real clean, Top. This thing is going to be a masters class in paper transitions and multi tube construction till you are done.
I concur. To say that I'm duly impressed doesn't even cover it. I really am watching this with great interest!:jaw:
 

markg

Well-Known Member
Joined
Jun 18, 2014
Messages
325
Reaction score
88
Location
Windsor, Ontario
I went rocket launching on Saturday with the Jackson Model Rocket Club. A bit cold and windy but the kids and I managed to launch a bunch of LPRs and I got in a couple of MPR flights as well. This was our first launch of the year and it was great to get out and put some rockets in the air.

I used the Aerotech 24/40 reloadable casing for the first time. Two launches of D9-7W with an Estes Eliminator XL and Top Shot. Both really nice flights. Composite motors are great!

We popped 3 fins off LPR models but no major damage. Sunday we got them repaired and ready to fly again.

Estes Eliminiator XL on D9-7W
129 (Medium).jpg

Estes Argent on an F22-5J
063 (Medium).jpg

Our Madcow Cricket (Swifty XXL) made it's first launch on a F52-11T. It's flying naked because we just put it together the night before. Not much room for recovery gear in this one. I'm going to cut the shoulder of the nosecone down a bit to make more room.
115 (Medium).jpg
 

Attachments

TopRamen

SA-5
Joined
Aug 9, 2013
Messages
9,919
Reaction score
18
I concur. To say that I'm duly impressed doesn't even cover it. I really am watching this with great interest!:jaw:
Thanks.

I came up with a clever way to make the booster cones today too. Using the PDF that rocketguy101 made for me, I took the Angle diagram and used it as a template for a balsa triangle that was then sanded to fit inside for reinforcement.
Prior to this, my oblique cones left a lot to be desired when it came to making them the perfect shape.

Oblique Cone Idea 2002-12-31 002.jpgOblique Cone Idea 2002-12-31 007.jpgOblique Cone Idea 2002-12-31 008.jpg
 

DavieRockets

Well-Known Member
Joined
Mar 31, 2011
Messages
461
Reaction score
8
Did the rocket laundry from Sunday's launch.
P1060623 (Large).JPG

Repaired the dent in Molly's Crayon rocket
P1060619 (Large).JPG

Did most of the repair on the broken Blue Iguana nosecone.
P1060631 (Large).JPG

Started the avbay on my Broken Arrow 54.
P1060632 (Large).JPG
 

TopRamen

SA-5
Joined
Aug 9, 2013
Messages
9,919
Reaction score
18
Threw some of the screws I use as micro rail buttons for makerbeam into my 13mmxBT-20 Fiberglassed, TTW Fins, AIM-120 AMRAAM, and prepped my LPR pad for launch.
Just waiting for the camera battery to charge, then I'll fly it in the front yard.


Pad Preperation. 2002-12-31 004.jpgRail Launch 13mm AIM-120 2002-12-31 001.jpg

Sorry for the crappy video quality. The Camera is from 2003, and does not even have audio.

https://www.youtube.com/watch?v=9RF6hk0NgDo&feature=youtu.be
 
Last edited:

swatkat

Down these mean skies, a kat must fly!
Joined
Jun 25, 2014
Messages
1,531
Reaction score
211
Location
Sactown, CA
Bought yet more motors for the SARG launch this weekend... now to prep rockets.
 

Trident

Retired, plenty of kits
Joined
Jan 18, 2009
Messages
859
Reaction score
8
Actually sprayed some paint today. We had snow a couple days ago, and it's been cold and windy. Today was 70 and no wind. It's springtime in Colorado. :)
 

Flyfalcons

Well-Known Member
Joined
Apr 14, 2015
Messages
2,290
Reaction score
411
Got the white paint on my PSII Patriot. Heading on a week-long trip starting tomorrow so that base coat will have lots of time to cure before I start masking for the yellow and red.
 

o1d_dude

'I battle gravity'
Joined
Jan 18, 2009
Messages
7,543
Reaction score
432
Location
Urff
Laid down what I thought was the final clear coat on my Madcow f/g 29mm Lil Goblin but of course there was a gnat. The finish came out otherwise very well. Perhaps I'll just leave the gnat there as a warning to future generations of gnats. I AM LEGEND!

Fitted the 38mm motor mount to the body tube of my f/g Lil Goblin ("Plan B") and fitted the the fins to the appropriate slots. Marked each fin and slot so that there should be no mistakes when the epoxy comes into play. It will be be too cool tonight so tomorrow might be a good day for it.
 

swatkat

Down these mean skies, a kat must fly!
Joined
Jun 25, 2014
Messages
1,531
Reaction score
211
Location
Sactown, CA
Le sigh... another trip to the local hobby store for a few more motors... just a few I promised!
 

TopRamen

SA-5
Joined
Aug 9, 2013
Messages
9,919
Reaction score
18
Finally had enough of the first practice booster made to do some dry fit mock up pictures.
I've got to make four of them eventually, so I want to try out a couple of different Ideas/methods first, to get the best design possible.
Looks cool though.:)


Booster mock-up SA-5 Gmmon 2002-12-31 001.jpgBooster mock-up SA-5 Gmmon 2002-12-31 003.jpgBooster mock-up SA-5 Gmmon 2002-12-31 006.jpg
 

dave carver

Nam Myoho Renge Kyo
Joined
Jan 18, 2009
Messages
4,965
Reaction score
4

TopRamen

SA-5
Joined
Aug 9, 2013
Messages
9,919
Reaction score
18
How much weight (if any) are you going to need for that rocket? Looks a little "butt" heavy...

Nose weight, according to Openrocket, little if any. The model relies on base drag for stability for the most part.
I think my sim is down to 1 oz. of nose weight in the latest revision, and still over 1.5 Calibers with a G40 loaded in OR.

That said, the model is not so large as to make swing testing impossible, so when it is near completion, the last part of the build will be dialing in the nose weight. Might not need any, might need as much as an ounce and a half.

It's not like a Matra R550 or AIM-9 with the forward canard fins, so though it "Looks butt heavy", aerodynamics take care of that in reality.
Aerodynamically speaking, it is nearly a cone.:)

The design has some inherent stability built into it. There have been other models of this basic configuration in the past, and Fliskits still makes a Thunderbird scale model which is similar. This is not virgin territory like my ongoing quest to see a flying TALOS.

Not to mention, those are all just practice parts you see in those pics, save for the tail cone and sustainer body tube.
I need to get my bearings straight on the design/dimensions, and develop the most lightweight methods possible for this build, without sacrificing strength.
 
Last edited:

Jay989898

New Member
Joined
Mar 24, 2016
Messages
3
Reaction score
0
I have a yellow rocket , it is 56"tall and quite heavy . 3 lbs 2 oz. anyway can you tell me the reason forthe brass threads ? They are 3 in a triangle .The outside diameter is3.6" or 80.25 mm.

In the photo shown the Inner diameter is 2.14" or 54.36mm . what are the 3inner BRASS THREADS FOR . I HAVE A TALLER ROCKET (85 " ) THAT HAS THE
NORMAL F MOTOR MOUNT . CAN YOU TELL ME MORE ABOUT THIS MOTOR MOUNTPLEASE !!!! THANKS , APOGEE DIDN'T EVEN REPLY . THANKYOU , Photo attached .

rocket mount sm.jpg
 

smapdiage9

Well-Known Member
Joined
Mar 14, 2009
Messages
418
Reaction score
1
That's probably for motor retention. Some systems use a retaining plate that is screwed into the threaded inserts in the aft centering ring to keep the motor pinned in. Others just use a screw with a washer on each insert that has enough overhang to retain the thrust ring in three places.
 

noffie79

Well-Known Member
Joined
Jul 25, 2015
Messages
1,287
Reaction score
1
Did you build it? If you bought it already built, the builder may have used that as motor retention. I don't see a regular (Aeropack) retainer on it.
 

rharshberger

Well-Known Member
Joined
Oct 13, 2014
Messages
9,100
Reaction score
1,238
Location
Pasco, WA
I have a yellow rocket , it is 56"tall and quite heavy . 3 lbs 2 oz. anyway can you tell me the reason forthe brass threads ? They are 3 in a triangle .The outside diameter is3.6" or 80.25 mm.

In the photo shown the Inner diameter is 2.14" or 54.36mm . what are the 3inner BRASS THREADS FOR . I HAVE A TALLER ROCKET (85 " ) THAT HAS THE
NORMAL F MOTOR MOUNT . CAN YOU TELL ME MORE ABOUT THIS MOTOR MOUNTPLEASE !!!! THANKS , APOGEE DIDN'T EVEN REPLY . THANKYOU , Photo attached .
Those three inserts are indeed for motor retention, as someone else pointed out most likely a simple screw with a washer large enough to catch the motors rear closure. I use the same "kaplow clip" style retention on most of my MPR and HPR rockets.

L3Build110.jpgL3Build108.jpgLastDayofBuild2.jpgCrayonRocketDay3two.jpg
 
Last edited:

SteveA63

Well-Known Member
Joined
Dec 28, 2015
Messages
63
Reaction score
0
I'm glad I scrolled down further. I was wondering how and with what, you accomplished this. So,I gotta ask, on a scale of 1 to 10, how would you rate this as a challenge? Great work. Enjoying watching it evolve.


I came up with a clever way to make the booster cones today too. Using the PDF that rocketguy101 made for me, I took the Angle diagram and used it as a template for a balsa triangle that was then sanded to fit inside for reinforcement.
Prior to this, my oblique cones left a lot to be desired when it came to making them the perfect shape.

View attachment 285843
 

TopRamen

SA-5
Joined
Aug 9, 2013
Messages
9,919
Reaction score
18
I'm glad I scrolled down further. I was wondering how and with what, you accomplished this. So,I gotta ask, on a scale of 1 to 10, how would you rate this as a challenge? Great work. Enjoying watching it evolve.
Thank You!:)

Challenge? On a scale? Hard to say because it is giving me so much sheer enjoyment.
Compared to other scratch builds or kits however, I guess I could rate it as an 7 or 8, mostly do to "How to attach the boosters to the sustainer".
Thankfully, unlike my ongoing attempt at a TALOS, it has no moving parts, so that is nice, and it is a fairly stable design in the first place.
If you imagine it cutting through through the air, as if in a wind tunnel, it is essentially a cone, and the booster fins and exhaust nozzles generate a healthy dose of base drag. As long as my boosters are all balanced in every aspect it should fly just fine.
I may purchase and build the Fliskits Thunderbird to use as a test platform to see what happens if I add a few grams to one side or the other.
Either way, I'll make sure all my boosters have identical weights and centers of gravity before attaching them to the sustainer.
The next most challenging part, but which is doable, is getting the angles of the fins and wings correct. The fins I have found can be done with the sandwiched fiberglass cloth method that Sunderll posted recently, and I may use paper skins on the wings, but that requires little thought, so I have not made it to that step yet. I'm still most concerned with the attachment points of the boosters.
It may take me a year to complete this build, but that's fine by me. When it is done, I will have advanced my skillsets and learned new ones, making me a more proficient modeler for the next "Challenge".:):)
 
2
Top