What did you do rocket wise today?

The Rocketry Forum

Help Support The Rocketry Forum:

teepot

Well-Known Member
TRF Supporter
Joined
Dec 8, 2019
Messages
1,977
Reaction score
1,586
Location
Pahrump, Nevada
Today I looked at my collection again. I'm trying to find rockets in good shape to donate to the club for the raffles next month. A lot of my early mid power stuff has battle damage and I can't give away those. So far I have 4 MPR and 5 HPR rockets picked out. I'll see if I can find 3 more. After the sun went down I painted one of the give aways. It had been my first attempt at a whistle rocket. It had Nerf dart whistle heads on it. Took those of and sanded it smooth and repainted. That is one of the mid powers for the raffle. I also put the first color coat on my current project. The, it didn't start out to be a Sci-Fi rocket that will be a Sci-Fi rocket. I used Rusto grey regular primer and it still felt soft today even after it sat for four days. The color coat came out just fine though. I have spent most of the day trying to come up with a new design. I'm having designers block. I'll think of something and then say to my self, already did that...twice. I've never done a tractor motor rocket before. One idea was a Loch Ness monster rocket. We'll see. Another was fins that were 3/4 circles going from small to large from top to bottom. And that's what made me think humps and then to Nessy. I'll think of something.
 

OverTheTop

Well-Known Member
TRF Supporter
Joined
Jul 10, 2007
Messages
6,125
Reaction score
3,718
Location
Melbourne Australia
Some more work on the relevant parameters to be set in my Vertical Trajectory System. Since the firmware upgrade there were about 50 more parameters to work thgough. Some good improvements in functionality though, in the Ardupilot firmware.

Also connected up the stepper drive PCB to my big NEMA42 stepper (all 8 pounds of it) and programmed it for an analog input. It quite happily tracks the pot position, just like a servo. I am impressed by the functionality of that little PCB (Polulu TIC 36v4). The dynamics can be programmed to be as casual or thrilling as is required :).
Stepper.jpg


Next up is to sketch an adapter to mount my antenna boom onto the shaft and 3D print it.
 

jqavins

Gone beardless since then
TRF Supporter
Joined
Sep 29, 2011
Messages
6,715
Reaction score
3,518
Location
Howard, NY
Five fins. Wombats have five toes.
I hope that's five toes per foot, the poor little things.

I don't know if these national wildlife themes are meant to appeal to your countrymen or to foreigners. I like them, but I don't like intercontinental shipping.

Another was fins that were 3/4 circles going from small to large from top to bottom.
That sounds intriguing, if only because there are so many things it might mean. Would you sketch that, please?
 

Old School Doug

Too energetic an ejection charge ??
TRF Supporter
Joined
Apr 17, 2020
Messages
214
Reaction score
423
Location
Lake County, Illinois
Finished up on the Belarus 9M318 just in time for the club launch this weekend. While it's not intended to be a true scale version it's close enough in my opinion to carry the moniker.
Also completed the fun rock. I'm stumped on what to call it so I decided to throw it open to the forum.
https://www.rocketryforum.com/threads/name-that-rocket.168589/

IMG_2598.JPG
 

NateB

Well-Known Member
Joined
Nov 6, 2012
Messages
2,230
Reaction score
2,416
Location
NE Indiana
After stripping off the wrap on my Thor 54, I started to paint the top part black. I've been using Rustoleum 2X, but the shelves haven't been restocked in a while. I couldn't search from store to store this afternoon, so I bought the only gloss black they had. It is cheap paint and hard to spray and get to coat evenly. I'll probably spray a few layers and then hope to find some 2X before I call it done.

T5476.jpg
 

kuririn

BARGeezer
TRF Lifetime Supporter
TRF Supporter
Joined
Oct 3, 2016
Messages
7,643
Reaction score
6,103
Location
Hawaii
The past 3 days have been rainy in the mornings, so it's build, build, build.
Assembled a couple of boost gliders: Estes Gryphon and Semroc Blue Jay.
0919211226[1].jpg



And laid down some tiny fillets on a Mach 1 Exiter.
0921211147a[1].jpg


Attached lugs on the Der Big Red Max the other day and ran fillets.
Built stock, assembly is complete.
May harden the balsa fins, we'll see.
0921211207[1].jpg


And finished assembling the Jim Flis Space Raider, which was in limbo for a few weeks.
0921211212[1].jpg

Laters.
 
Last edited:

Wayco

Desert Rat Rocketeer
TRF Lifetime Supporter
Joined
Mar 23, 2011
Messages
3,754
Reaction score
852
Location
Goodyear, AZ
We drove back from Red River, NM. last Saturday with the toyhauler packed full. Airfest was somewhat washed out, so we had several rockets that hadn't been flown, along with all the stuff left over from our summer in northern New Mexico.
It took me until yesterday to get things back in order here in Goodyear, and I finally got back to my Big Bad Dog build. This Wildman kit was special ordered with a 75mm MMT, and started earlier this year. I finished the fincan before we left for the summer, and yesterday I started the avbay. It's been years since I did a build thread, but avbays are my favorite part, so I thought I would document how I build a 4" avbay, which is big enough that I can show details.
I started with the sled, and cut a piece of 1/8" fiberglass down to 3 3/4" x 8 7/8" to fit inside the coupler. Cut slots in the ends to accommodate the 1/4/20 lock nuts that hold the eyebolts on, and then used two sided tape to attach the components in their proper place. Drilled holes for the Perfectflite standoffs and Doghouse battery holders and a small threaded hole to attach the Featherweight magnetic switches. Here is the results:
sled with components.jpg


Now that I know where everything goes, I built the forward avbay lid. Drilled out holes for the 8/32 all-thread and eyebolt, then marked where the terminal block and 3 gram Doghouse charge cups go. Drilled the small holes for the TB, and drilled and threaded the holes for the 8/32 screws that hold the charge cups:
nose lid.jpg


When I mount the charge cups, I cut off the threads on the backside so they don't interfere with the sled and components:
backside nose lid.jpg

I also provide for stress relief by hot gluing the wires as they come through the lid and retaining them out of the way with 1/4" shrink tubing.

Soldering the wires to the TB requires me to use the "helping hands" and tinning the wires and posts on the TB:
TB solder 1.jpg


Then I can hold the wire with one hand and soldering iron with the other:
TB solder 2.jpg


After soldering the wires, I squeeze a bit of hot glue where the backside of the TB fits, and pull the wires down to seal.
TB glue.jpg

The first part of the build was done yesterday evening, today I finished up the aft lid and sled.

The aft lid is done in similar fashion, with the addition of an external speaker for the Stratologger:

aft lid holes.jpg


After securing the components on the aft lid, I wired up and soldered the sled components. Here is the completed avbay:
avbay complete.jpg


And some detail on the sled:
sled detail.jpg


I had a member PM me about the Featherweight magnetic switches,
Timbucktoo asked me if they work with carbon fiber avbays and said " I seem to recall I once read that you dabbled with magnetic switches" So I replied that I had two CF rockets with those switches, and they worked fine for all the flights that I did with them. I also data mined my logs, and found that I have 25 dual deploy rockets with magnetic switches in them, most of them are redundant, just like the one above, and each one has all the components intact in all my rockets. I don't move things around, once it's built, it stays with that rocket.
It was really fun to get back into the rocket room with all my tools and toys, I'm looking forward to finishing a few projects before the first launch of the season with TRA/PHX next month.
 

OverTheTop

Well-Known Member
TRF Supporter
Joined
Jul 10, 2007
Messages
6,125
Reaction score
3,718
Location
Melbourne Australia
When I mount the charge cups, I cut off the threads on the backside so they don't interfere with the sled and components:
backside nose lid.jpg
Careful with wires being shrunk next to allthread. Threads have been known to short through insulation. Personally I would heatshrink the allthread first. YMMV.
 

arconhi

Well-Known Member
TRF Supporter
Joined
Jul 5, 2020
Messages
567
Reaction score
486
Location
exmore va.
The I229T is a one-grain 54mm motor similar to the ones I'm planning to fly the rockets you gave me on. It's on the lower end of "I" impulse, but not low enough for me to call it a baby I, though that's subjective.

I'm guessing Mega Max hit over 1000 feet judging by how small it looked and how long it took to fall back to the ground, but I'm not completely sure. Like I said, I forgot to put my AltimeterThree in it to get actual data.
I never did weigh the two twin rockets I gave you. Have you weighed them? They look like they should be pretty stable for 54mm.
 

Pappy

old man with time on his hands
TRF Supporter
Joined
Jun 3, 2021
Messages
147
Reaction score
222
Location
Tampa Bay
I just finished that same beer. 😁
good stuff, right? really tasty for something so strong... 8.2. we have a local beer here in tampa called jai alai , 9.0 i think, and it tastes like shoe polish and chewing tobacco. horrible. lol
 

teepot

Well-Known Member
TRF Supporter
Joined
Dec 8, 2019
Messages
1,977
Reaction score
1,586
Location
Pahrump, Nevada
Watched paint dry. Yesterday I painted 2 rockets. One was the current project and I repainted one of the rockets I'm donating. Today I also went over to see Bill at BMS. He was teaching me to solder. I think I got it. Then I came home and ordered a soldering station. I'm still drawing a blank on a new design. Back to watching the paint.
 

Wayco

Desert Rat Rocketeer
TRF Lifetime Supporter
Joined
Mar 23, 2011
Messages
3,754
Reaction score
852
Location
Goodyear, AZ
Careful with wires being shrunk next to allthread. Threads have been known to short through insulation. Personally I would heatshrink the allthread first. YMMV.
Thanks for the tip. A lot of the methods I use are the result of comments like this on TRF.
My method does vary in that I use marine heat shrink that has a heat sensitive glue, which bonds the wires to the allthread. I will add an inspection and resistance/short testing to my normal setup process with all my avbays and note the results in my logs. This problem has not occurred previously.
 

OverTheTop

Well-Known Member
TRF Supporter
Joined
Jul 10, 2007
Messages
6,125
Reaction score
3,718
Location
Melbourne Australia
My method does vary in that I use marine heat shrink that has a heat sensitive glue, which bonds the wires to the allthread.
Sounds like you use my favourite type of heatshrink too :clapping:. Works a treat. I rarely use the un-glued tubing.
 
Top